doc-linux-ja-html 2006.05.25-1.1 / usr / share / doc / HOWTO / ja-html / NET3-4-HOWTO-6.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
 <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
 <TITLE>Linux Networking-HOWTO (Previously the Net-3 Howto): IP ´Ø·¸¡¢¥¤¡¼¥µ¥Í¥Ã¥È´Ø·¸¤Î¾ðÊó</TITLE>
 <LINK HREF="NET3-4-HOWTO-7.html" REL=next>
 <LINK HREF="NET3-4-HOWTO-5.html" REL=previous>
 <LINK HREF="NET3-4-HOWTO.html#toc6" REL=contents>
</HEAD>
<BODY>
<A HREF="NET3-4-HOWTO-7.html">¼¡¤Î¥Ú¡¼¥¸</A>
<A HREF="NET3-4-HOWTO-5.html">Á°¤Î¥Ú¡¼¥¸</A>
<A HREF="NET3-4-HOWTO.html#toc6">Ìܼ¡¤Ø</A>
<HR>
<H2><A NAME="s6">6. IP ´Ø·¸¡¢¥¤¡¼¥µ¥Í¥Ã¥È´Ø·¸¤Î¾ðÊó</A></H2>

<P>¤³¤Î¾Ï¤Ç¤Ï¡¢¥¤¡¼¥µ¥Í¥Ã¥È¤È IP ¤Ë¸ÇÍ­¤Î¾ðÊó¤òÀâÌÀ¤·¤Þ¤¹¡£¤³¤Î¾Ï¤Ë´Þ
¤Þ¤ì¤ëÆâÍƤϡ¢°ÊÁ°¤ÎÈǤǡ֤½¤ì¤¾¤ì¤Î¥Í¥Ã¥È¥ï¡¼¥¯µ»½Ñ¤Ë¤Ä¤¤¤Æ¤Î¾ðÊó¡×
¤È¤¤¤¦¾Ï¤Ë´Þ¤Þ¤ì¤Æ¤¤¤¿ÆâÍƤ«¤é¡¢É®¼Ô¤¬ÆäËÌÌÇò¤¤¤È»×¤Ã¤¿¤â¤Î¤ò
¥Ô¥Ã¥¯¥¢¥Ã¥×¤·¤ÆÊ̸ĤˤޤȤ᤿¤â¤Î¤Ç¤¹¡£
LAN ¤ò°ú¤¤¤Æ¤¤¤ë¿Í¤Ê¤éï¤Ç¤â¡¢¤³¤Î¾Ï¤ÎÆâÍƤÏÌò¤ËΩ¤Ä¤Ï¤º¤Ç¤¹¡£
<P>
<H2><A NAME="ss6.1">6.1 ¥¤¡¼¥µ¥Í¥Ã¥È</A>
</H2>

<P>¥¤¡¼¥µ¥Í¥Ã¥È¤Î¥Ç¥Ð¥¤¥¹Ì¾¤Ï `<CODE>eth0</CODE>', `<CODE>eth1</CODE>',
`<CODE>eth2</CODE>'¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡£¥«¡¼¥Í¥ë¤¬¸¡½Ð¤·¤¿ºÇ½é¤Î¥«¡¼¥É¤¬ 
`<CODE>eth0</CODE>'¤Ç¡¢°Ê²¼¥«¡¼¥É¤¬¸¡½Ð¤¹¤ë½ç¤ËÈֹ椬¿¶¤é¤ì¤Æ¤¤¤­¤Þ¤¹¡£
<P>¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï Linux ¥«¡¼¥Í¥ë¤Ï¥¤¡¼¥µ¥Í¥Ã¥È¥Ç¥Ð¥¤¥¹¤ò°ì¤Ä¤·¤«¸¡½Ð¤·¤Ê
¤¤¤Î¤Ç¡¢¤½¤ì°Ê¾å¤Î¥Ü¡¼¥É¤ò¥«¡¼¥Í¥ë¤Ë¸¡½Ð¤µ¤»¤ë¤¿¤á¤Ë¤Ï¡¢¥³¥Þ¥ó¥É¥é¥¤¥ó
°ú¿ô¤Ç»ØÄꤹ¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£
<P>Linux ¤Ç¥¤¡¼¥µ¥Í¥Ã¥È¥«¡¼¥É¤ò»È¤¦ÊýË¡¤Î¾ÜºÙ¤Ë¤Ä¤¤¤Æ¤Ï
<A HREF="Ethernet-HOWTO.html">Ethernet-HOWTO</A>
¤ò»²¾È¤·¤Æ¤¯¤À¤µ¤¤¡£
<P>¤ª»È¤¤¤Î¥¤¡¼¥µ¥Í¥Ã¥È¥«¡¼¥É¤ò¥µ¥Ý¡¼¥È¤¹¤ë¤è¤¦¤Ë¥«¡¼¥Í¥ë¤ò¤­¤Á¤ó¤ÈºÆ¹½ÃÛ
¤·¤Æ¤·¤Þ¤¨¤ÐÀßÄꤽ¤Î¤â¤Î¤Ï´Êñ¤Ç¤¹¡£
<P>ÀßÄê¤ÏÄ̾°Ê²¼¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹(¤Û¤È¤ó¤É¤Î¥Ç¥£¥¹¥È¥ê¥Ó¥å¡¼¥·¥ç¥ó¤Ï¡¢
¥¤¡¼¥µ¥Í¥Ã¥È¤ò¥µ¥Ý¡¼¥È¤¹¤ë¤è¤¦¤ËÀßÄꤹ¤ì¤Ð¼«Æ°Åª¤Ë¤³¤ÎÀßÄê¤â¹Ô¤¦
¤Ï¤º¤Ç¤¹):
<P>
<BLOCKQUOTE><CODE>
<PRE>
        root# ifconfig eth0 192.168.0.1 netmask 255.255.255.0 up
        root# route add -net 192.168.0.0 netmask 255.255.255.0 eth0
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>¤Û¤È¤ó¤É¤Î¥¤¡¼¥µ¥Í¥Ã¥È¥Ç¥Ð¥¤¥¹¤Ï Donald Becker
<CODE>becker@CESDIS.gsfc.nasa.gov</CODE> ¤¬³«È¯¤·¤Þ¤·¤¿¡£
<P>
<H2><A NAME="ss6.2">6.2 EQL - Ê£¿ô²óÀþ¤Î¥È¥é¥Õ¥£¥Ã¥¯¥¤¥³¥é¥¤¥¶</A>
</H2>

<P>EQL ¤Î¥Ç¥Ð¥¤¥¹Ì¾¤Ï `<CODE>eql</CODE>' ¤Ç¤¹¡£É¸½à¤Î¥«¡¼¥Í¥ë¥½¡¼¥¹¤Ç¤Ï°ìÂæ¤Î
¥Þ¥·¥ó¤Ç°ì¤Ä¤Î EQL ¥Ç¥Ð¥¤¥¹¤·¤«»È¤¨¤Ê¤¤¤«¤â¤·¤ì¤Þ¤»¤ó¡£EQL ¤ò»È¤¨¤Ð¡¢
PPP ¤ä slip¡¢plip ¤È¤¤¤Ã¤¿ÆóÅÀ´ÖÀܳ¤òÊ£¿ôÍÑ°Õ¤·¤Æ¡¢¤½¤ì¤é¤ò°ì¤Ä¤ÎÏÀÍý
Ū¤ÊÀܳ¤Î¤è¤¦¤ËÍøÍѤǤ­¤Þ¤¹¡£¤¿¤¤¤Æ¤¤¤Î¾ì¹ç¡¢¹â®¤ÎÀìÍÑÀþ¤è¤ê¤âÄ㮲ó
Àþ¤òÊ£¿ô¤Þ¤È¤á¤¿Êý¤¬°Â²Á¤Ë²óÀþ®ÅÙ¤ò²Ô¤²¤Þ¤¹¡£
<P><B>¥«¡¼¥Í¥ë¤Î¥³¥ó¥Ñ¥¤¥ë¥ª¥×¥·¥ç¥ó</B>:
<BLOCKQUOTE><CODE>
<PRE>
        Network device support  --->
            [*] Network device support
            &lt;*> EQL (serial line load balancing) support
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>¤³¤Îµ¡Ç½¤ò»È¤¦¤¿¤á¤Ë¤Ï¡¢ÀܳÀè¤Î¥Þ¥·¥ó¤â EQL µ¡Ç½¤ò»ý¤Ã¤Æ¤¤¤Ê¤±¤ì¤Ð¤¤
¤±¤Þ¤»¤ó¡£Linux¡¢ Livingstone Portmaster ¥·¥ê¡¼¥º°Ê¹ß¤Î¥À¥¤¥¢¥ë¥¤¥ó
¥µ¡¼¥Ð¤Ê¤É¤¬¤³¤Îµ¡Ç½¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤Þ¤¹¡£
<P>EQL ¤òÀßÄꤹ¤ë¤Ë¤Ï¡¢
<A HREF="ftp://metalab.unc.edu/pub/linux/system/Serial/eql-1.2.tar.gz">metalab.unc.edu</A>
¤«¤éÆþ¼ê¤Ç¤­¤ë EQL Íѥġ¼¥ë¤¬É¬Íפˤʤê¤Þ¤¹¡£
<P>EQL ¤ÎÀßÄê¤Ï¤´¤¯´Êñ¤Ç¤¹¡£¤Þ¤ººÇ½é¤Ë eql ¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹¤òÀßÄꤷ¤Þ¤¹¡£
eql ¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤Ï¾¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥Ç¥Ð¥¤¥¹¤È¤Û¤È¤ó¤ÉƱ¤¸¤Ç¤¹¡£
IP ¥¢¥É¥ì¥¹¤ä mtu ¤Ï 
<EM>ifconfig</EM> ¤òÍѤ¤¤Æ²¼µ­¤Î¤è¤¦¤ËÀßÄꤷ¤Þ¤¹¡£
<P>
<BLOCKQUOTE><CODE>
<PRE>
        root# ifconfig eql 192.168.10.1 mtu 1006
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>¼¡¤Ë¡¢»È¤ª¤¦¤È¤·¤Æ¤¤¤ë²óÀþ¤½¤ì¤¾¤ì¤ò¼êÆ°¤Çµ¯Æ°¤·¤Þ¤¹¡£ÆóÅÀ´ÖÀÜ
³¤òÊ£¿ôÍÑ°Õ¤¹¤ë¤³¤È¤Ë¤Ê¤ë¤Ç¤·¤ç¤¦¡£¤É¤Î¤è¤¦¤Ëµ¯Æ°¤¹¤ë¤«¤Ï»È¤¦Àܳ¤Î¼ï
Îà¤Ë°Í¸¤·¤Þ¤¹¤Î¤Ç¡¢¾Ü¤·¤¤¾ðÊó¤Ï¤½¤ì¤¾¤ì¤ÎÀܳ·ÁÂ֤ˤĤ¤¤ÆÀâÌÀ¤·¤¿¾Ï¤ò
¤´Í÷¤¯¤À¤µ¤¤¡£
<P>ºÇ¸å¤Ë¥·¥ê¥¢¥ëÀܳ¤ò EQL ¥Ç¥Ð¥¤¥¹¤Ë·ë¤Ó¤Ä¤±¤Þ¤¹¡£¤³¤ì¤Ï¡Ö¥¹¥ì¡¼¥Ö²½
(enslalving)¡×¤È¸Æ¤Ð¤ì¡¢<EM>eql_enslave</EM> ¥³¥Þ¥ó¥É¤Ë¤è¤Ã¤Æ
°Ê²¼¤Î¤è¤¦¤Ë¹Ô¤¤¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        root# eql_enslave eql sl0 28800
        root# eql_enslave eql ppp0 14400
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P><EM>eql_enslave</EM> ¥³¥Þ¥ó¥É¤ËÍ¿¤¨¤ë¡Ö¿äÄê²óÀþ®ÅÙ(estimated speed)¡×
¥Ñ¥é¥á¡¼¥¿¤Ï¡¢Ä¾Àܤˤϲ¿¤â¤·¤Þ¤»¤ó¡£¤³¤Î¥Ñ¥é¥á¡¼¥¿¤Ï EQL ¥Ç¥Ð¥¤¥¹
¤¬¥Ç¡¼¥¿¥°¥é¥à¤ò¤½¤ì¤¾¤ì¤Î²óÀþ¤«¤é¤É¤Î¤è¤¦¤Ê³ä¹ç¤Ç¼õ¤±¤ë¤«¤ò·èÄꤹ¤ë¤¿
¤á¤Ë»È¤ï¤ì¤ë¤Î¤Ç¡¢¤³¤Î¿ô»ú¤ò¤¦¤Þ¤¯Ä´À°¤·¤ÆºÇŬÃͤòõ¤·¤Æ¤¯¤À¤µ¤¤¡£
<P>EQL ¥Ç¥Ð¥¤¥¹¤«¤é²óÀþ¤ò³«Êü¤¹¤ë¤Ë¤Ï¡¢°Ê²¼¤Î¤è¤¦¤Ë 
<EM>eql_emancipate</EM> ¥³¥Þ¥ó¥É¤ò»È¤¤¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        root# eql_emancipate eql sl0
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>¾¤ÎÆóÅÀ´ÖÀܳ¤ÈƱ¤¸¤¯¡¢EQL ¥Ç¥Ð¥¤¥¹¤ò»È¤Ã¤¿·ÐÏ©À©¸æ¤â²Äǽ¤Ç¤¹¤¬¡¢
¤½¤Î¾ì¹ç¼ÂºÝ¤Î¥·¥ê¥¢¥ë¥Ç¥Ð¥¤¥¹¤Ç¤Ï¤Ê¤¯ <CODE>eql</CODE> ¥Ç¥Ð¥¤¥¹¤ò·ÐÏ©¤Ë
»È¤¤¤Þ¤¹¡£Î㤨¤Ð¡¢°Ê²¼¤Î¤è¤¦¤Ë·ÐÏ©¤òÀßÄê¤Ç¤­¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        root# route add default eql
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>EQL ¥É¥é¥¤¥Ð¤Ï Simon Janes  <CODE>simon@ncm.com</CODE> ¤¬³«È¯¤·¤Þ¤·¤¿¡£
<P>
<H2><A NAME="ss6.3">6.3 IP ¥Ñ¥±¥Ã¥ÈÅý·×¾ðÊó¤Î¼èÆÀ(Linux 2.0 ÍÑ)</A>
</H2>

<P>¥«¡¼¥Í¥ë¤Ë IP ¥Ñ¥±¥Ã¥ÈÅý·×¾ðÊó¤Î¼èÆÀµ¡Ç½(IP accounting µ¡Ç½)¤òÁȤ߹þ¤á
¤Ð¡¢¥Í¥Ã¥È¥ï¡¼¥¯¤Î»ÈÍѵ­Ï¿¤ò¼è¤ë¤³¤È¤¬¤Ç¤­¤Þ¤¹¡£µ­Ï¿¤Ç¤­¤ë¥Ç¡¼¥¿¤Ï¡¢ºÇ
¸å¤Ë¥«¥¦¥ó¥¿¤ò¥ê¥»¥Ã¥È¤·¤Æ¤«¤é¤ä¤ê¤È¤ê¤·¤¿¥Ñ¥±¥Ã¥È¿ô¤È¥Ç¡¼¥¿¤Î¥Ð¥¤¥È¿ô
¤Ç¤¹¡£¥«¥Æ¥´¥ê¤´¤È¤Ë°Û¤Ê¤ë¥ë¡¼¥ë¤ò»ØÄê¤Ç¤­¡¢ÌÜŪ¤Ë±þ¤¸¤¿ÀßÄ꤬²Äǽ¤Ç¤¹¡£
¤³¤Î¥ª¥×¥·¥ç¥ó¤Ï¥«¡¼¥Í¥ë 2.1.102 ¤Ç¤Ê¤¯¤Ê¤ê¤Þ¤·¤¿¡£¸Å¤¤ ipfwadm ¥Ù¡¼¥¹
¤Î¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ë¤¬ ``ipfwchains'' ¤Ë¤è¤Ã¤ÆÃÖ¤­´¹¤¨¤é¤ì¤¿¤«¤é¤Ç¤¹¡£
<P>
<P><B>¥«¡¼¥Í¥ë¤Î¥³¥ó¥Ñ¥¤¥ë¥ª¥×¥·¥ç¥ó</B>:
<BLOCKQUOTE><CODE>
<PRE>
        Networking options  --->
            [*] IP: accounting
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>¥«¡¼¥Í¥ë¤ËɬÍפʵ¡Ç½¤òÁȤ߹þ¤ó¤ÇºÆµ¯Æ°¤·¤¿¸å¡¢<EM>ipfwadm</EM> ¥³¥Þ¥ó
¥É¤ò»È¤Ã¤Æ IP ¥Ñ¥±¥Ã¥ÈÅý·×¼èÆÀµ¡Ç½¤òÀßÄꤷ¤Þ¤¹¡£IP ¥Ñ¥±¥Ã¥È¤ÎÅý·×¾ðÊó
¤òºÙʬ¤¹¤ë¤¿¤á¤ÎÊýË¡¤Ï¤¤¤í¤¤¤í¤¢¤ê¤Þ¤¹¡£°Ê²¼¤Ë¼ÂºÝ¤Ë»È¤¨¤½¤¦¤Ê´Êñ¤ÊÀß
ÄêÎã¤ò¼¨¤·¤Æ¤ß¤Þ¤¹¡£¾ÜºÙ¤Ë¤Ä¤¤¤Æ¤Ï <EM>ipfwadm</EM> ¤Î man ¥Ú¡¼¥¸¤òÆÉ
¤ó¤Ç¤¯¤À¤µ¤¤¡£
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¤·¤Æ¤¤¤ë¥Þ¥·¥ó¤¬¤¢¤ê¡¢ftp ¤ä WWW ¤È¤¤¤Ã¤¿¥È¥é¥Õ¥£¥Ã¥¯¤¬¤É¤ì¤¯¤é¤¤À¸¤¸
¤Æ¤¤¤ë¤«¤òÃΤꤿ¤¤¤È¤·¤Þ¤¹¡£¤Þ¤¿ tcp, udp Á´ÂΤˤĤ¤¤Æ¤âƱÍͤΤ³¤È¤ò
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<P>
<BLOCKQUOTE><CODE>
<PRE>
        #!/bin/sh
        #
        # Flush the accounting rules
        ipfwadm -A -f
        #
        # Set shortcuts
        localnet=44.136.8.96/29
        any=0/0
        # Add rules for local ethernet segment
        ipfwadm -A in  -a -P tcp -D $localnet ftp-data
        ipfwadm -A out -a -P tcp -S $localnet ftp-data
        ipfwadm -A in  -a -P tcp -D $localnet www
        ipfwadm -A out -a -P tcp -S $localnet www
        ipfwadm -A in  -a -P tcp -D $localnet
        ipfwadm -A out -a -P tcp -S $localnet
        ipfwadm -A in  -a -P udp -D $localnet
        ipfwadm -A out -a -P udp -S $localnet
        #
        # Rules for default
        ipfwadm -A in  -a -P tcp -D $any ftp-data
        ipfwadm -A out -a -P tcp -S $any ftp-data
        ipfwadm -A in  -a -P tcp -D $any www
        ipfwadm -A out -a -P tcp -S $any www
        ipfwadm -A in  -a -P tcp -D $any
        ipfwadm -A out -a -P tcp -S $any
        ipfwadm -A in  -a -P udp -D $any
        ipfwadm -A out -a -P udp -S $any
        #
        # List the rules
        ipfwadm -A -l -n
        #
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>``ftp-data'' ¤ä ``www'' ¤È¤¤¤Ã¤¿Ì¾Á°¤Ï <CODE>/etc/services</CODE> ¤Ë¤ª
¤±¤ëÀßÄê¤ò»²¾È¤·¤Þ¤¹¡£ºÇ¸å¤Î¥³¥Þ¥ó¥É¤Ï¤½¤ì¤¾¤ì¤Î IP ¥Ñ¥±¥Ã¥ÈÅý·×¤Î¼èÆÀ
µ¬Â§¤òÎóµó¤·¡¢½¸¤á¤¿¥Ç¡¼¥¿¤Î¹ç·×Ãͤòɽ¼¨¤·¤Þ¤¹¡£
<P>
<P>IP ¥Ñ¥±¥Ã¥ÈÅý·×¾ðÊó¤ò²òÀϤ¹¤ëºÝ¤ËÃí°Õ¤¹¤Ù¤­¤Ê¤Î¤Ï¡¢<B>¥Þ¥Ã¥Á¤·¤¿¤¹
¤Ù¤Æ¤Îµ¬Â§¤Ë¤ª¤±¤ë³Æ¹ç·×¥¨¥ê¥¢¤ËÂФ·¤Æ(žÁ÷¥Ð¥¤¥È¿ô¤ä¥Ñ¥±¥Ã¥È¿ô¤¬)¤½¤ì
¤¾¤ì­¤·¤³¤Þ¤ì¤ë</B>¤È¤¤¤¦¤³¤È¤Ç¤¹¡£¤³¤Î¤¿¤á¡¢º¹¤È¤·¤Æ¸½¤ì¤ëÃͤòÆÀ¤ë
¤Ë¤Ï¿¾¯¤Î·×»»¤¬É¬ÍפǤ¹¡£Î㤨¤Ð¡¢ftp ¤Ç¤â www ¤Ç¤â¤Ê¤¤¥Ç¡¼¥¿Î̤òÃΤë
¤¿¤á¤Ë¤Ï¡¢Á´¤Æ¤Î¥Ý¡¼¥È¤Ë¥Þ¥Ã¥Á¤¹¤ëµ¬Â§¤è¤êÆÀ¤¿Å¾Á÷Î̤«¤é¡¢ftp ¤ä www 
¤È¤¤¤Ã¤¿¸Ä¡¹¤Î¥×¥í¥È¥³¥ë¤ÇžÁ÷¤·¤¿¥Ç¡¼¥¿Î̤ò°ú¤¯É¬Íפ¬¤¢¤ê¤Þ¤¹¡£
<P>
<BLOCKQUOTE><CODE>
<PRE>
root# ipfwadm -A -l -n
IP accounting rules
 pkts bytes dir prot source               destination          ports
    0     0 in  tcp  0.0.0.0/0            44.136.8.96/29       * -> 20
    0     0 out tcp  44.136.8.96/29       0.0.0.0/0            20 -> *
   10  1166 in  tcp  0.0.0.0/0            44.136.8.96/29       * -> 80
   10   572 out tcp  44.136.8.96/29       0.0.0.0/0            80 -> *
  252 10943 in  tcp  0.0.0.0/0            44.136.8.96/29       * -> *
  231 18831 out tcp  44.136.8.96/29       0.0.0.0/0             * -> *
    0     0 in  udp  0.0.0.0/0            44.136.8.96/29       * -> *
    0     0 out udp  44.136.8.96/29       0.0.0.0/0            * -> *
    0     0 in  tcp  0.0.0.0/0            0.0.0.0/0            * -> 20
    0     0 out tcp  0.0.0.0/0            0.0.0.0/0            20 -> *
   10  1166 in  tcp  0.0.0.0/0            0.0.0.0/0            * -> 80
   10   572 out tcp  0.0.0.0/0            0.0.0.0/0            80 -> *
  253 10983 in  tcp  0.0.0.0/0            0.0.0.0/0            * -> *
  231 18831 out tcp  0.0.0.0/0            0.0.0.0/0            * -> *
    0     0 in  udp  0.0.0.0/0            0.0.0.0/0            * -> *
    0     0 out udp  0.0.0.0/0            0.0.0.0/0            * -> *
</PRE>
</CODE></BLOCKQUOTE>
<P>
<H2><A NAME="ss6.4">6.4 IP¥Ñ¥±¥Ã¥ÈÅý·×¼èÆÀ(Linux 2.2 ÍÑ)</A>
</H2>

<P>¿·¤·¤¤ IP ¥Ñ¥±¥Ã¥ÈÅý·×¼èÆÀµ¡Ç½¤Ï¡ÖIP Firewall Chains¡×¤òÄ̤¸¤ÆÍøÍÑ
¤·¤Þ¤¹¡£¾Ü¤·¤¯¤Ï
<A HREF="http://www.adelaide.net.au/~rustcorp/ipfwchains/ipfwchains.html">IP chains ¤Î¥Û¡¼¥à¥Ú¡¼¥¸</A>
¤ò¸«¤Æ¤¯¤À¤µ¤¤¡£ÆäËÃí°Õ¤¹¤Ù¤­¤Ê¤Î¤Ï¡¢¥Õ¥£¥ë¥¿¤ÎÀßÄê¤Ë¤Ï <CODE>ipfwadm</CODE>
¤Ç¤Ï¤Ê¤¯ <EM>ipchains</EM> ¤ò»È¤¦É¬Íפ¬¤¢¤ëÅÀ¤Ç¤¹(ºÇ¿·ÈÇ¥«¡¼¥Í¥ë¤Î
<CODE>Documentation/Changes</CODE> ¤è¤ê)¡£
<P>
<H2><A NAME="ss6.5">6.5 IP ¥¨¥¤¥ê¥¢¥¹</A>
</H2>

<P>1 ¤Ä¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥Ç¥Ð¥¤¥¹¤ËÊ£¿ô¸Ä¤Î IP ¥¢¥É¥ì¥¹¤òÀßÄê¤Ç¤­¤ë¤ÈÊØÍø
¤ÊÍÑÅÓ¤¬¤¤¤¯¤Ä¤«¤¢¤ê¤Þ¤¹¡£¥¤¥ó¥¿¡¼¥Í¥Ã¥È¥µ¡¼¥Ó¥¹¥×¥í¥Ð¥¤¥À(ISP)¤Ï¤è¤¯
¤³¤Îµ¡Ç½¤òÍѤ¤¤Æ¡¢¸ÜµÒ¤Ë¹ç¤ï¤»¤Æ¡Ö¥«¥¹¥¿¥Þ¥¤¥º¤·¤¿¡×WWW ¥µ¡¼¥Ó¥¹¤ä ftp
¥µ¡¼¥Ó¥¹¤òÄ󶡤·¤Æ¤¤¤Þ¤¹¡£¤³¤³¤Ë½ñ¤¤¤Æ¤¤¤ë°Ê¾å¤Î¾ðÊó¤Ë¤Ä¤¤¤Æ¤Ï¡¢
``IP-Alias mini-HOWTO'' ¤ò¤´Í÷¤¯¤À¤µ¤¤¡£
<P>
<P><B>¥«¡¼¥Í¥ë¤Î¥³¥ó¥Ñ¥¤¥ë¥ª¥×¥·¥ç¥ó</B>:
<BLOCKQUOTE><CODE>
<PRE>
        Networking options  --->
            ....
            [*] Network aliasing
            ....
            &lt;*> IP: aliasing support
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>IP_Alias µ¡Ç½¤òÁȤ߹þ¤ó¤À¥«¡¼¥Í¥ë¤ò¹½ÃÛ¤·¤Æ¥¤¥ó¥¹¥È¡¼¥ë¤·¤Æ¤·¤Þ¤¨¤Ð¡¢
¤³¤Îµ¡
ǽ¤òÀßÄꤹ¤ë¤Î¤Ï¤´¤¯´Êñ¤Ç¤¹¡£alias µ¡Ç½¤Ï¡¢¼ÂºÝ¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥Ç¥Ð¥¤¥¹
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¤Æ¤ë̾Á°¤Ï¡¢<CODE>&lt;devname&gt;:&lt;virtual dev num&gt;</CODE> ¤Î·Á¤Ç¡¢
<CODE>eth0:0</CODE>¡¢<CODE>ppp0:10</CODE> ¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡£ifname:number ·Á¼°¤Î¥Ç¥Ð¥¤¥¹
¤Ï¡¢¥á¥¤¥ó¤Î¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤ÎÀßÄê<EM>¸å</EM>¤Ç¤Ê¤±¤ì¤ÐÀßÄê¤Ç¤­¤Ê¤¤ÅÀ¤Ë
Ãí°Õ¤·¤Æ¤¯¤À¤µ¤¤¡£
<P>
<P>¤¿¤È¤¨¤Ð¡¢ 2 ¤Ä¤Î°Û¤Ê¤Ã¤¿ IP ¥µ¥Ö¥Í¥Ã¥È¥ï¡¼¥¯¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë
¥¤¡¼¥µ¥Í¥Ã¥È¥Í¥Ã¥È¥ï¡¼¥¯¤ËÀܳ
¤·¤¿¥Þ¥·¥ó¤¬¤¢¤ë¤È¤·¤Æ¡¢Æ±»þ¤ËÁÐÊý¤Î¥µ¥Ö¥Í¥Ã¥È¤Ë¥¢¥¯¥»¥¹¤·¤¿¤¤¾ì¹ç¡¢
°Ê²¼¤Î¤è¤¦¤Ë¤·¤Þ¤¹¡£
<P>
<BLOCKQUOTE><CODE>
<PRE>
        root# ifconfig eth0 192.168.1.1 netmask 255.255.255.0 up
        root# route add -net 192.168.1.0 netmask 255.255.255.0 eth0

        root# ifconfig eth0:0 192.168.10.1 netmask 255.255.255.0 up
        root# route add -net 192.168.10.0 netmask 255.255.255.0 eth0:0
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>¥¨¥¤¥ê¥¢¥¹¤òºï½ü¤¹¤ë¾ì¹ç¡¢²¾ÁÛŪ¤Ê¥Ç¥Ð¥¤¥¹Ì¾¤Î¸å¤Ë `<CODE>-</CODE>' ¤òÉÕ¤±¤Æ 
<CODE>ifconfig</CODE> ¤·¤Þ¤¹¡£
<P>
<BLOCKQUOTE><CODE>
<PRE>
        root# ifconfig eth0:0- 0
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
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<P>
<H2><A NAME="ss6.6">6.6 IP ¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ë(Linux 2.0 ÍÑ)</A>
</H2>

<P>IP ¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ë¤È¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ëÁ´È̤ˤĤ¤¤Æ¤Ï
<A HREF="Firewall-HOWTO.html">Firewall-HOWTO</A>
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¤¯¥Ç¡¼¥¿¥°¥é¥à¤ËÂФ¹¤ë¤â¤Î¡¢ÆâÉô¤ÇžÁ÷(forward)¤¹¤ë¥Ç¡¼¥¿¥°¥é¥à¤ËÂФ¹
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¥Ç¡¼¥¿¥°¥é¥à¤ËÂФ·¤ÆŬÍѤµ¤ì¡¢½Ð¤Æ¤¤¤¯¥Ç¡¼¥¿¥°¥é¥à¤ËÂФ¹¤ë¥ë¡¼¥ë¤Ï¥Í¥Ã
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<P>
<P><B>¥«¡¼¥Í¥ë¤Î¥³¥ó¥Ñ¥¤¥ë¥ª¥×¥·¥ç¥ó</B>:
<BLOCKQUOTE><CODE>
<PRE>
        Networking options  --->
            [*] Network firewalls
            ....
            [*] IP: forwarding/gatewaying
            ....
            [*] IP: firewalling
            [ ] IP: firewall packet logging
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>IP ¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ëµ¡Ç½¤Ï <EM>ipfwadm</EM> ¥³¥Þ¥ó¥É¤ò»È¤Ã¤ÆÀßÄꤷ¤Þ¤¹¡£
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<P>IP ¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ëµ¡Ç½¤ÎºÇ¤â°ìÈÌŪ¤Ê»È¤¤Êý¤Ï¡¢Linux ¥Þ¥·¥ó¤ò¥ë¡¼¥¿¤ä
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/¥ë¡¼¥¿¤Ë¤·¤Æ¤¤¤Þ¤¹¡£
<P>
<BLOCKQUOTE><CODE>
<PRE>
-                                   -
 \                                  | 172.16.37.0
  \                                 |   /255.255.255.0
   \                 ---------      |
    |  172.16.174.30 | Linux |      |
NET =================|  f/w  |------|    ..37.19
    |    PPP         | router|      |  --------
   /                 ---------      |--| Mail |
  /                                 |  | /DNS |
 /                                  |  --------
-                                   -
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ë¤òÀßÄꤹ¤ë¤¿¤á¤Î¥³¥Þ¥ó¥É¤Ï¡¢Ä̾ï <CODE>rc</CODE> ¥Õ¥¡¥¤¥ë¤Ë
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¤é¤³¤ì¤é¤ÎÀßÄê¤ò¹Ô¤¦¤Ù¤­¤Ç¤¹¤¬¡¢¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ë¥Þ¥·¥ó¤ò¥ê¥Ö¡¼¥È¤·¤¿ºÝ
¤Ë狼¤¬¥¤¥¿¥º¥é¤¹¤ë¤Î¤òËɤ°¤¿¤á¡¢¥Í¥Ã¥È¥ï¡¼¥¯ÀßÄê¤ÎÁ°¤Ë¼Â¹Ô¤¹¤ëɬ
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<P>
<BLOCKQUOTE><CODE>
<PRE>
        #!/bin/sh

        # Flush the 'Forwarding' rules table
        # Change the default policy to 'accept'
        #
        /sbin/ipfwadm -F -f
        /sbin/ipfwadm -F -p accept
        #
        # .. and for 'Incoming'
        #
        /sbin/ipfwadm -I -f
        /sbin/ipfwadm -I -p accept

        # First off, seal off the PPP interface
        # I'd love to use '-a deny' instead of '-a reject -y' but then it
        # would be impossible to originate connections on that interface too.
        # The -o causes all rejected datagrams to be logged. This trades
        # disk space against knowledge of an attack of configuration error.
        #
        /sbin/ipfwadm -I -a reject -y -o -P tcp -S 0/0 -D 172.16.174.30

        # Throw away certain kinds of obviously forged packets right away:
        # Nothing should come from multicast/anycast/broadcast addresses
        #
        /sbin/ipfwadm -F -a deny -o -S 224.0/3 -D 172.16.37.0/24
        #
        # and nothing coming from the loopback network should ever be
        # seen on a wire
        #
        /sbin/ipfwadm -F -a deny -o -S 127.0/8 -D 172.16.37.0/24
        
        # accept incoming SMTP and DNS connections, but only
        # to the Mail/Name Server
        #
        /sbin/ipfwadm -F -a accept -P tcp -S 0/0 -D 172.16.37.19 25 53
        #
        # DNS uses UDP as well as TCP, so allow that too
        # for questions to our name server
        #
        /sbin/ipfwadm -F -a accept -P udp -S 0/0 -D 172.16.37.19 53
        #
        # but not "answers" coming to dangerous ports like NFS and
        # Larry McVoy's NFS extension.  If you run squid, add its port here.
        #
        /sbin/ipfwadm -F -a deny -o -P udp -S 0/0 53 \
                -D 172.16.37.0/24 2049 2050
        
        # answers to other user ports are okay
        #
        /sbin/ipfwadm -F -a accept -P udp -S 0/0 53 \
                -D 172.16.37.0/24 53 1024:65535
        
        # Reject incoming connections to identd
        # We use 'reject' here so that the connecting host is told
        # straight away not to bother continuing, otherwise we'd experience
        # delays while ident timed out.
        #
        /sbin/ipfwadm -F -a reject -o -P tcp -S 0/0 -D 172.16.37.0/24 113

        # Accept some common service connections from the 192.168.64 and
        # 192.168.65 networks, they are friends that we trust.
        #
        /sbin/ipfwadm -F -a accept -P tcp -S 192.168.64.0/23 \
                -D 172.16.37.0/24 20:23
        
        # accept and pass through anything originating inside
        #
        /sbin/ipfwadm -F -a accept -P tcp -S 172.16.37.0/24 -D 0/0
        
        # deny most other incoming TCP connections and log them
        # (append 1:1023 if you have problems with ftp not working)
        #
        /sbin/ipfwadm -F -a deny -o -y -P tcp -S 0/0 -D 172.16.37.0/24
        
        # ... for UDP too
        #
        /sbin/ipfwadm -F -a deny -o -P udp -S 0/0 -D 172.16.37.0/24
        
</PRE>
</CODE></BLOCKQUOTE>
<P>¤è¤¤¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ë¤ÎÀßÄê¤Ï¿¾¯¥È¥ê¥Ã¥­¡¼¤Ë¤Ê¤Ã¤Æ¤¤¤ë¤â¤Î¤Ç¤¹¤¬¡¢¤³¤³
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<P>
<H2><A NAME="ss6.7">6.7 IP ¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ë (Linux 2.2 ÍÑ)</A>
</H2>

<P>¿·¤·¤¤¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ëµ¡Ç½¤Ï ``IP Firewall Chains'' ¤ò»È¤Ã¤ÆÍøÍѤÇ
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<A HREF="http://www.adelaide.net.au/~rustcorp/ipfwchains/ipfwchains.html">IP chains ¤Î¥Û¡¼¥à¥Ú¡¼¥¸</A> 
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<P>
<H2><A NAME="ss6.8">6.8 IPIP ¥«¥×¥»¥ë²½</A>
</H2>

<P>IP ¥Ç¡¼¥¿¥°¥é¥à¤ÎÃæ¤Ë IP ¥Ç¡¼¥¿¥°¥é¥à¤ò¥«¥×¥»¥ë²½¤·¤ÆÆþ¤ì¤ë¤È¡¢¤Ê¤ó¤ÎÌò¤ËΩ¤Ä¤ó
¤Ç¤·¤ç¤¦¤«? Á°¤â¤Ã¤Æ»È¤¤ÅÓ¤òÃΤäƤ¤¤Ê¤±¤ì¤Ð¡¢¤³¤Î¼êË¡¤Ï¤­¤Ã¤È´ñ̯¤Ë»×
¤¨¤ë¤³¤È¤Ç¤·¤ç¤¦¡£¤Ç¤Ï¡¢¤³¤ì¤¬¤è¤¯»È¤ï¤ì¤ëÌÜŪ¤ò 2 ¤Ä¼¨¤·¤Þ¤·¤ç¤¦¡£
¥â¥Ð¥¤¥ë IP ¤È IP ¥Þ¥ë¥Á¥­¥ã¥¹¥È¤Ç¤¹¡£¤â¤Ã¤È¤â¹­¤¯»È¤ï¤ì¤Æ¤¤¤ë¤±
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<P>
<P><B>¥«¡¼¥Í¥ë¤Î¥³¥ó¥Ñ¥¤¥ë¥ª¥×¥·¥ç¥ó</B>:
<BLOCKQUOTE><CODE>
<PRE>
        Networking options  --->
            [*] TCP/IP networking
            [*] IP: forwarding/gatewaying
            ....
            &lt;*> IP: tunneling
        
</PRE>
</CODE></BLOCKQUOTE>
<P>IP ¥È¥ó¥Í¥ë¥Ç¥Ð¥¤¥¹¤Ï `<CODE>tunl0</CODE>', `<CODE>tunl1</CODE>' Åù¤È¤Ê¤ê¤Þ¤¹¡£
<P>¡Ö¤Ç¤â¡¢¤É¤¦¤·¤Æ¤³¤ó¤Ê¤â¤Î¤ò»È¤¦¤Î?¡×¤«¤Ã¤Æ? ¤Ï¤¤¤Ï¤¤¡¢ÀâÌÀ¤·¤Þ¤·¤ç¤¦¡£
º£¤Þ¤Ç¤Î IP ·ÐÏ©À©¸æ¤Ç¤Ï¡¢IP ¥Í¥Ã¥È¥ï¡¼¥¯¤Ï¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹¤È
¥Í¥Ã¥È¥ï¡¼¥¯¥Þ¥¹¥¯¤«¤é¹½À®¤µ¤ì¤ë¤³¤È¤Ë¤Ê¤Ã¤Æ¤¤¤Þ¤·¤¿¡£¤³¤ì¤Ë¤è¤ê¡¢Ï¢Â³
¤·¤¿°ìÏ¢¤Î¥¢¥É¥ì¥¹¤ÎÁ´¤Æ¤ËÂФ·¤Æ 1 ¤Ä¤Î·ÐÏ©À©¸æ¥¨¥ó¥È¥ê¤ò»È¤Ã¤¿·ÐÏ©À©¸æ
¤¬¹Ô¤¨¤Þ¤·¤¿¡£¤³¤ì¤ÏÂçÊÑÊØÍø¤Ç¤¹¤¬¡¢¤¢¤ëÆÃÄê¤Î¥Í¥Ã¥È¥ï¡¼¥¯¤Î°ìÉô¤ËÀܳ
¤·¤Æ¤¤¤ë´Ö¤ÏÆÃÄê¤Î IP ¥¢¥É¥ì¥¹¤·¤«»È¤¨¤Ê¤¤¤È¤¤¤¦¤³¤È¤Ç¤â¤¢¤ê¤Þ¤¹¡£¤Û¤È
¤ó¤É¤Î¾ì¹ç¤Ï¤³¤ì¤Ç¤âÂç¾æÉפʤΤǤ¹¤¬¡¢¤¢¤Ê¤¿¤¬¥â¥Ð¥¤¥ëÇɤǤ¢¤ì¤Ð¡¢¤º¤Ã
¤È 1 ¤Ä¤Î¾ì½ê¤ËÀܳ¤·¤¿¤Þ¤Þ¤È¤¤¤¦¤ï¤±¤Ë¤Ï¤¤¤«¤Ê¤¤¤È»×¤¤¤Þ¤¹¡£
IP/IP ¥«¥×¥»¥ë²½(IP ¥È¥ó¥Í¥ê¥ó¥°)¤ò»È¤¦¤È¡¢¼«Ê¬¤Î IP ¥¢¥É¥ì¥¹°¸¤Î
¥Ç¡¼¥¿¥°¥é¥à¤Ë IP ¤ÎÈé¤ò¤«¤Ö¤»¤ÆÊ̤ΠIP ¥¢¥É¥ì¥¹¤ËÁ÷¤ë¤³¤È¤Ë¤è¤Ã¤Æ¡¢¤³
¤ÎÀ©¸Â¤ò¹îÉþ¤Ç¤­¤Þ¤¹¡£¤·¤Ð¤é¤¯Ê̤ΠIP ¥Í¥Ã¥È¥ï¡¼¥¯¤Çºî¶È¤ò¤¹¤ë¤³¤È¤¬Ê¬
¤«¤Ã¤Æ¤¤¤ì¤Ð¡¢¼«Ê¬¤Î¸µ¡¹¤Î¥Í¥Ã¥È¥ï¡¼¥¯¾å¤Î¥Þ¥·¥ó¤¬¤¢¤Ê¤¿¤Î IP ¥¢¥É¥ì¥¹
°¸¤Î¥Ç¡¼¥¿¥°¥é¥à¤ò¼õ¤±ÉÕ¤±¡¢¤³¤ì¤ò¸½ºß°ì»þŪ¤Ë»È¤Ã¤Æ¤¤¤ë¥¢¥É¥ì¥¹¤ËÁ÷¤ë
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<P>
<P>
<H3>¥È¥ó¥Í¥ê¥ó¥°¤ò¹Ô¤¦¥Í¥Ã¥È¥ï¡¼¥¯ÀßÄê</H3>

<P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
 192.168.1/24                          192.168.2/24

     -                                     -
     |      ppp0 =            ppp0 =       |
     |  aaa.bbb.ccc.ddd  fff.ggg.hhh.iii   |
     |                                     |
     |   /-----\                 /-----\   |
     |   |     |       //        |     |   |
     |---|  A  |------//---------|  B  |---|
     |   |     |     //          |     |   |
     |   \-----/                 \-----/   |
     |                                     |
     -                                     -
</PRE>
</CODE></BLOCKQUOTE>
<P>¤³¤Î¿Þ¤Ï¡¢IPIP ¥«¥×¥»¥ë²½¤¬É¬ÍפȤʤëÊ̤ÎÍýͳ¡¢¤¹¤Ê¤ï¤Á
²¾Áۥץ饤¥Ù¡¼¥È¥Í¥Ã¥È¥ï¡¼¥¯(virtual private networking, VPN)¤ò¼¨¤·¤Æ
¤¤¤Þ¤¹¡£¤³¤ÎÎã¤Ç¤Ï¡¢¥À¥¤¥¢¥ë¥¢¥Ã¥×¤Ë¤è¤ëñ½ã¤Ê¥¤¥ó¥¿¡¼¥Í¥Ã¥ÈÀܳ¤ò¤·¤Æ
¤¤¤ë¥Þ¥·¥ó¤¬ 2 Â椢¤ë¤³¤È¤òÁ°Äó¤È¤·¤Þ¤¹¡£¤½¤ì¤¾¤ì¤Î¥Û¥¹¥È¤Ï IP ¥¢¥É¥ì
¥¹¤ò 1 ¤Ä¤À¤±³ä¤êÅö¤Æ¤é¤ì¤Æ¤¤¤Þ¤¹¡£¤³¤ì¤é¤Î¥Þ¥·¥ó¤Î¸å¤í¤Ë¤Ï¡¢Í½ÌóºÑ¤ß
¤Î IP ¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹¤ò»È¤¦ÀßÄê¤Î¥×¥é¥¤¥Ù¡¼¥È¤Ê LAN ¤¬¤¤¤¯¤Ä¤«¤¢
¤ê¤Þ¤¹¡£¤³¤Î¤È¤­¡¢¥Í¥Ã¥È¥ï¡¼¥¯ A ¾å¤Î¥Û¥¹¥È¤È¥Í¥Ã¥È¥ï¡¼¥¯ B ¾å¤Î¥Û¥¹¥È
¤ò¡¢¤¢¤ë¥Í¥Ã¥È¥ï¡¼¥¯·ÐÏ©¤ò»È¤Ã¤ÆÀµ¤·¤¯¥¤¥ó¥¿¡¼¥Í¥Ã¥È¤ËÀܳ¤·¤Æ¤¤¤ë¤«¤Î
¤è¤¦¤ËÀܳ¤·¤¿¤¤¤È¤·¤Þ¤¹¡£IPIP ¥«¥×¥»¥ë²½¤ò»È¤¦¤È¤³¤ì¤¬²Äǽ¤Ë¤Ê¤ê¤Þ¤¹¡£
¥«¥×¥»¥ë²½¤Ç¤Ï¡¢¥Í¥Ã¥È¥ï¡¼¥¯ A ¤È B ¤Î¥Û¥¹¥È¤ò¥¤¥ó¥¿¡¼¥Í¥Ã¥È¾å¤ÎÊ̤ΥÛ
¥¹¥È¤ÈÄÌ¿®¤µ¤»¤ë¤È¤¤¤¦ÌäÂê¤Ï²ò·è¤µ¤ì¤Ê¤¤¤Î¤ÇÃí°Õ¤·¤Æ¤¯¤À¤µ¤¤¡£ ¤³¤ì¤ò
¹Ô¤¦¤Ë¤Ï¡¢¤µ¤é¤Ë IP ¥Þ¥¹¥«¥ì¡¼¥ÉÅù¤Îµ»¤¬É¬ÍפȤʤê¤Þ¤¹¡£¥«¥×¥»¥ë²½¤ÏÉá
ÄÌ¡¢¥Þ¥·¥ó¤ò¥ë¡¼¥¿¤Î¤è¤¦¤Ëµ¡Ç½¤µ¤»¤ë¤³¤È¤Ç¼Â¸½¤·¤Þ¤¹¡£
<P>
<P>Linux ¤Ë¤è¤ë¥ë¡¼¥¿ `<CODE>A</CODE>' ¤Ï¡¢°Ê²¼¤Î¤è¤¦¤Ê¥¹¥¯¥ê¥×¥È¤ò»È¤Ã¤ÆÀßÄꤷ¤Þ
¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        #!/bin/sh
        PATH=/sbin:/usr/sbin
        mask=255.255.255.0
        remotegw=fff.ggg.hhh.iii
        #
        # Ethernet configuration
        ifconfig eth0 192.168.1.1 netmask $mask up
        route add -net 192.168.1.0 netmask $mask eth0
        #
        # ppp0 configuration (start ppp link, set default route)
        pppd
        route add default ppp0
        #
        # Tunnel device configuration
        ifconfig tunl0 192.168.1.1 up
        route add -net 192.168.2.0 netmask $mask gw $remotegw tunl0
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>Linux ¤Ë¤è¤ë¥ë¡¼¥¿ `<CODE>B</CODE>' ¤âƱÍͤΥ¹¥¯¥ê¥×¥È¤ò»È¤Ã¤ÆÀßÄꤷ¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        #!/bin/sh
        PATH=/sbin:/usr/sbin
        mask=255.255.255.0
        remotegw=aaa.bbb.ccc.ddd
        #
        # Ethernet configuration
        ifconfig eth0 192.168.2.1 netmask $mask up
        route add -net 192.168.2.0 netmask $mask eth0
        #
        # ppp0 configuration (start ppp link, set default route)
        pppd
        route add default ppp0
        #
        # Tunnel device configuration
        ifconfig tunl0 192.168.2.1 up
        route add -net 192.168.1.0 netmask $mask gw $remotegw tunl0
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>°Ê²¼¤Î¥³¥Þ¥ó¥É
<P>
<BLOCKQUOTE><CODE>
<PRE>
        route add -net 192.168.1.0 netmask $mask gw $remotegw tunl0
        
</PRE>
</CODE></BLOCKQUOTE>
<P>¤Ï¡¢¡Ö<CODE>192.168.1.0/24</CODE>°¸¤ÎÁ´¤Æ¤Î¥Ç¡¼¥¿¥°¥é¥à¤ò¡¢½ªÅÀ¥¢¥É¥ì¥¹¤¬
<CODE>aaa.bbb.ccc.ddd</CODE> ¤Ç¤¢¤ë IPIP ¥«¥×¥»¥ë²½¥Ç¡¼¥¿¥°¥é¥à¤ÎÃæ¤ËÁ÷¤ë¤³¤È¡×
¤ÈÆɤߤޤ¹¡£
<P>ÀßÄê¤Ïξü¤ÇÂФˤʤëÅÀ¤ËÃí°Õ¤·¤Æ¤¯¤À¤µ¤¤¡£¥È¥ó¥Í¥ë¥Ç¥Ð¥¤¥¹¤Ï¡¢·ÐÏ©¤ò»Ø
Äꤹ¤ë¤¿¤á¤Ë¼õ¤±¼è¤Ã¤¿¥Ç¡¼¥¿¥°¥é¥à¤òÆþ¤ì¤¿ IP ¥Ç¡¼¥¿¥°¥é¥à¤Î<EM>½ªÅÀ</EM>
¤È¤·¤Æ¡¢·ÐÏ©¤ÎÃæ¤Ç `<CODE>gw</CODE>' ¤ò»È¤¤¤Þ¤¹¡£¤½¤Î¥Þ¥·¥ó¤Ï IPIP ¥Ç¡¼¥¿¥°¥é¥à
¤Î¥«¥×¥»¥ë²½²ò½ü¤ÎÊýË¡¤òÃΤäƤ¤¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó¡£
¤Ä¤Þ¤ê¡¢¥È¥ó¥Í¥ë¥Ç¥Ð¥¤¥¹¤¬ÀßÄꤵ¤ì¤Æ¤¤¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó¡£
<P>
<H3>¥È¥ó¥Í¥ê¥ó¥°¤ò¹Ô¤¦¥Û¥¹¥È¤ÎÀßÄê</H3>

<P>¥Í¥Ã¥È¥ï¡¼¥¯Á´ÂΤǤޤȤá¤Æ·ÐÏ©À©¸æ¤ò¹Ô¤¦É¬ÍפϤ¢¤ê¤Þ¤»¤ó¡£Î㤨¤Ð¡¢1 ¤Ä
¤Î IP ¥¢¥É¥ì¥¹¤À¤±¤Î·ÐÏ©¤ò»ØÄꤹ¤ë¤³¤È¤â¤Ç¤­¤Þ¤¹¡£¤³¤Î¾ì¹ç¤Ë¤Ï¡¢¡Ö¥ê¥â¡¼
¥È¡×¤Î¥Þ¥·¥ó¤Î<CODE>tunl</CODE> ¥Ç¥Ð¥¤¥¹¤Ë¥Û¡¼¥à¤Î IP ¥¢¥É¥ì¥¹¤òÀßÄꤷ¡¢A ¦¤Ç
¤Ï¥È¥ó¥Í¥ë¥Ç¥Ð¥¤¥¹¤òÄ̤¸¤Æ¡¢¥Í¥Ã¥È¥ï¡¼¥¯¤Î·ÐÏ©À©¸æ¤Ç¤Ï¤Ê¤¯¥Û¥¹¥È¤Î·ÐÏ©
À©¸æ(¤ª¤è¤Ó Proxy Arp)¤ò¹Ô¤¦¤À¤±¤Ç¤¹¡£¹½À®¿Þ¤òÀµ¤·¤¯½ñ¤­Ä¾¤·¤Æ¤ß¤Þ¤·¤ç
¤¦¡£º£Å٤ξì¹ç¤Ï¡¢Î¾Êý¤¬¥¤¥ó¥¿¡¼¥Í¥Ã¥È¤Ë´°Á´¤ËÀܳ¤·¡¢¤«¤Ä¥Û¥¹¥È 
`<CODE>A</CODE>' ¤¬¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¥ê¥â¡¼¥È¤Î¥Í¥Ã¥È¥ï¡¼¥¯¤Î°ìÉô¤Ç¤¢¤ë¤«¤Î¤è¤¦
¤ËÆ°ºî¤µ¤»¤¿¤¤¥Û¥¹¥È `<CODE>B</CODE>' ¤¬¤¢¤ë¤À¤±¤Ç¤¹:
<P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
 192.168.1/24

     -
     |      ppp0 =                ppp0 =
     |  aaa.bbb.ccc.ddd      fff.ggg.hhh.iii
     |
     |   /-----\                 /-----\
     |   |     |       //        |     |
     |---|  A  |------//---------|  B  |
     |   |     |     //          |     |
     |   \-----/                 \-----/
     |                      also: 192.168.1.12
     -
</PRE>
</CODE></BLOCKQUOTE>
<P>Linux ¤Ë¤è¤ë¥ë¡¼¥¿ `<CODE>A</CODE>' ¤Ï°Ê²¼¤Î¥·¥§¥ë¥¹¥¯¥ê¥×¥È¤ò»È¤Ã¤ÆÀßÄꤷ¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        #!/bin/sh
        PATH=/sbin:/usr/sbin
        mask=255.255.255.0
        remotegw=fff.ggg.hhh.iii
        #
        # Ethernet configuration
        ifconfig eth0 192.168.1.1 netmask $mask up
        route add -net 192.168.1.0 netmask $mask eth0
        #
        # ppp0 configuration (start ppp link, set default route)
        pppd
        route add default ppp0
        #
        # Tunnel device configuration
        ifconfig tunl0 192.168.1.1 up
        route add -host 192.168.1.12 gw $remotegw tunl0
        #
        # Proxy ARP for the remote host
        arp -s 192.168.1.12 xx:xx:xx:xx:xx:xx pub
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>Linux ¥Û¥¹¥È `<CODE>B</CODE>' ¤Ï°Ê²¼¤Î¥·¥§¥ë¥¹¥¯¥ê¥×¥È¤ò»È¤Ã¤ÆÀßÄꤷ¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        #!/bin/sh
        PATH=/sbin:/usr/sbin
        mask=255.255.255.0
        remotegw=aaa.bbb.ccc.ddd 
        #
        # ppp0 configuration (start ppp link, set default route)
        pppd
        route add default ppp0
        #
        # Tunnel device configuration
        ifconfig tunl0 192.168.1.12 up
        route add -net 192.168.1.0 netmask $mask gw $remotegwtunl0
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>¤³¤Î¤è¤¦¤ÊÀßÄê¤Ï¡¢¥â¥Ð¥¤¥ë IP ¤ò¹Í¤¨¤ë¤È¤è¤ê¤Ï¤Ã¤­¤ê¤·¤Þ¤¹¡£
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¤½¤Î´Ö¤º¤Ã¤È 1 ¤Ä¤Î IP ¥¢¥É¥ì¥¹¤ò»È¤¤Â³¤±¤é¤ì¤ë¤ÈÊØÍø¤Ç¤¹¡£¼ÂºÝ¤Î
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<H2><A NAME="ss6.9">6.9 IP ¥Þ¥¹¥«¥ì¡¼¥É(IP Masquerade)</A>
</H2>

<P>¥¤¥ó¥¿¡¼¥Í¥Ã¥È¤ËÀܳ¤¹¤ë¤¿¤á¤Ë¥À¥¤¥¢¥ë¥¢¥Ã¥×Àܳ¤ò»È¤Ã¤Æ¤¤¤ë¿Í¤â¤¿¤¯¤µ
¤ó¤¤¤ë¤³¤È¤Ç¤·¤ç¤¦¡£¤³¤¦¤¤¤Ã¤¿Àܳ¤òÍѤ¤¤Æ¤¤¤ë¤Û¤È¤ó¤É¤Î¿Í¤Ï¡¢
ISP ¤«¤é IP ¥¢¥É¥ì¥¹¤ò 1 ¤Ä¤·¤«¤â¤é¤¨¤Þ¤»¤ó¡£ 1 Âæ¤Î¥Û¥¹¥È¤¬´°Á´
¤Ë¥Í¥Ã¥È¥ï¡¼¥¯¤Ë¥¢¥¯¥»¥¹¤¹¤ë¤Ë¤Ï¡¢ÉáÄÌ¤Ï IP ¥¢¥É¥ì¥¹¤¬ 1 ¤Ä¤¢¤ì¤Ð½½Ê¬¤À¤«¤é¤Ç
¤¹¡£IP ¥Þ¥¹¥«¥ì¡¼¥É(IP Masquerade)¤È¤¤¤¦¤Î¤Ï¡¢1 ¤Ä¤Î IP ¥¢¥É¥ì¥¹¤òÊ£¿ô
¤Î¥³¥ó¥Ô¥å¡¼¥¿¤Ç»È¤¦¤¿¤á¤Î¤¦¤Þ¤¤»Å³Ý¤±¤Ç¤¹¡£IP ¥Þ¥¹¥«¥ì¡¼¥É¤ò»È¤¨¤Ð¡¢
¡Ö¥Þ¥¹¥«¥ì¡¼¥É(masquerade, ÊÑÁõ)¡×¤È¤¤¤¦¸ÀÍÕ¤ÎÄ̤ꡢ¾¤Î¥Û¥¹¥È¤ò
¥À¥¤¥¢¥ë¥¢¥Ã¥×Àܳ¤·¤Æ¤¤¤ë¥Þ¥·¥ó¤Ë¸«¤»¤«¤±¤Æ IP ¥¢¥É¥ì¥¹¤ò¶¦Í­¤Ç¤­¤Þ¤¹¡£
¤¿¤À¤·Ãí°ÕÅÀ¤â¾¯¤·¤¢¤Ã¤Æ¡¢¥Þ¥¹¥«¥ì¡¼¥Éµ¡Ç½¤Ï¤Û¤Ü³Î¼Â¤ËÊÒÊý¸þ¤ÎÄÌ¿®¤Ç¤·
¤«Æ°ºî¤·¤Þ¤»¤ó¡£¤Ä¤Þ¤ê¡¢¥Þ¥¹¥«¥ì¡¼¥É¤µ¤ì¤Æ¤¤¤ë¥Û¥¹¥È¤Ï¼«Ê¬¤«¤é¤ÎÀܳ¤Ï
¹Ô¤¨¤Þ¤¹¤¬¡¢¥ê¥â¡¼¥È¥Û¥¹¥È¤«¤é¤ÎÀܳ¤ò¼õ¤±ÉÕ¤±¤ë¤³¤È¤Ï¤Ç¤­¤Þ¤»¤ó¡£
¤·¤¿¤¬¤Ã¤Æ¡¢<EM>talk</EM> Åù¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥µ¡¼¥Ó¥¹¤ÏÆ°ºî¤·¤Þ¤»¤ó¤·¡¢
<EM>ftp</EM> Åù¤Î¥µ¡¼¥Ó¥¹¤Ï¥Ñ¥Ã¥·¥Ö(PASV)¥â¡¼¥É¤ÇÆ°ºî¤¹¤ë¤è¤¦¤ËÀßÄꤷ¤Ê¤±
¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó¡£¹¬±¿¤Ê¤³¤È¤Ë¡¢<EM>telnet</EM>, WWW,  <EM>irc</EM> ¤ò´Þ¤àÂçÉôʬ
¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥µ¡¼¥Ó¥¹¤Ï¤¦¤Þ¤¯Æ°ºî¤·¤Þ¤¹¡£
<P>
<P><B>¥«¡¼¥Í¥ë¤Î¥³¥ó¥Ñ¥¤¥ë¥ª¥×¥·¥ç¥ó</B>:
<BLOCKQUOTE><CODE>
<PRE>
        Code maturity level options  --->
            [*] Prompt for development and/or incomplete code/drivers
        Networking options  --->
            [*] Network firewalls
            ....
            [*] TCP/IP networking
            [*] IP: forwarding/gatewaying
            ....
            [*] IP: masquerading (EXPERIMENTAL)
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>ÉáÄ̤ξì¹ç¡¢¤¢¤Ê¤¿¤Î Linux ¥Þ¥·¥ó¤Ë¤Ï slip ¤« PPP ¥À¥¤¥¢¥ë¥¢¥Ã¥×
Àܳµ¡Ç½¤¬ÁȤ߹þ¤Þ¤ì¤Æ¤¤¤ë»ö¤Ç¤·¤ç¤¦ (¤¢¤¿¤«¤â¥¹¥¿¥ó¥É¥¢¥í¥ó¤Î¥Þ¥·¥ó¤Ç
¤¢¤ë¤«¤Î¤è¤¦¤Ë)¡£¤µ¤é¤Ë¡¢¤½¤Î¥Þ¥·¥ó¤Ë¤ÏÊ̤Υͥåȥ¥¯¥Ç¥Ð¥¤¥¹ (¿ʬ
¥¤¡¼¥µ¥Í¥Ã¥È) ¤¬ÀßÄꤵ¤ì¤Æ¤¤¤Æ¡¢¥Í¥Ã¥È¥ï¡¼¥¯¤¬°ì¤Ä³ä¤ê¿¶¤é¤ì¤Æ¤¤¤ë¤³¤È¤Ë
¤Ê¤Ã¤Æ¤¤¤ë¤Ç¤·¤ç¤¦¡£
¥Þ¥¹¥«¥ì¡¼¥É·Ðͳ¤ÇÀܳ¤¹¤ë¥Û¥¹¥È¤Ï¤³¤Î 
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¥Þ¥·¥ó¤Î¥Ç¥Õ¥©¥ë¥È¤Î·ÐÏ©¤Ë¤Ï¡¢ IP ¥Þ¥¹¥«¥ì¡¼¥É¤òÁȤ߹þ¤ó¤Ç¥¤¥ó¥¿¡¼¥Í¥Ã¥È
¤È¤Î¥²¡¼¥È¥¦¥§¥¤¤Ë¤Ê¤Ã¤Æ¤¤¤ë¡¢¤³¤Î Linux ¥Þ¥·¥ó¤ò»ØÄꤷ¤Þ¤¹¡£
<P>¤è¤¯¤¢¤ë IP ¥Þ¥¹¥«¥ì¡¼¥É¤ÎÀßÄê¤Ï²¼¿Þ¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
-                                   -
 \                                  | 192.168.1.0
  \                                 |   /255.255.255.0
   \                 ---------      |
    |                | Linux | .1.1 |
NET =================| masq  |------|
    |    PPP/slip    | router|      |  --------
   /                 ---------      |--| host |
  /                                 |  |      |
 /                                  |  --------
-                                   -
</PRE>
</CODE></BLOCKQUOTE>
<P><EM>IPFWADM ¤ò»È¤Ã¤¿ IP ¥Þ¥¹¥«¥ì¡¼¥É</EM>
<P>¤³¤ÎÀßÄê¤ò¹Ô¤¦¤¿¤áºÇ¤âŬÀڤʥ³¥Þ¥ó¥É¤Ï°Ê²¼¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        # Network route for ethernet
        route add -net 192.168.1.0 netmask 255.255.255.0 eth0
        #
        # Default route to the rest of the internet.
        route add default ppp0
        #
        # Cause all hosts on the 192.168.1/24 network to be masqueraded.
        ipfwadm -F -a m -S 192.168.1.0/24 -D 0.0.0.0/0 
        
</PRE>
</CODE></BLOCKQUOTE>
<P><EM>ipchains ¤ò»È¤Ã¤¿ IP ¥Þ¥¹¥«¥ì¡¼¥É</EM>
<P>¤³¤ì¤Ï ipfwadm ¤ò»È¤¦¾ì¹ç¤È»÷¤Æ¤¤¤Þ¤¹¤¬¡¢¥³¥Þ¥ó¥É¤Î¹½Â¤¤¬ÊѤï¤Ã¤Æ
¤¤¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        # Network route for ethernet
        route add -net 192.168.1.0 netmask 255.255.255.0 eth0
        #
        # Default route to the rest of the internet.
        route add default ppp0
        #
        # Cause all hosts on the 192.168.1/24 network to be masqueraded.
        ipchains -A forward -s 192.168.1.0/24 -j MASQ
        
</PRE>
</CODE></BLOCKQUOTE>
<P>IP ¥Þ¥¹¥«¥ì¡¼¥Éµ¡Ç½¤Î¾Ü¤·¤¤ÀâÌÀ¤Ï
<A HREF="http://www.hwy401.com/achau/ipmasq/">IP Masquerade Resource Page</A>
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``IP-Masquerade mini-HOWTO'' ¤¬¤¢¤ê¤Þ¤¹¡£¤³¤Îʸ½ñ¤Ë¤Ï¡¢Linux ¤ò»È¤Ã¤¿ 
IP ¥Þ¥¹¥«¥ì¡¼¥É¥µ¡¼¥Ð¤È¾¤Î OS ¤òÁȤ߹ç¤ï¤»¤Æ»È¤¦¤¿¤á¤ÎÀßÄê¤âºÜ¤Ã¤Æ¤¤
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<A HREF="http://ipmasq.cjb.net/">Linux IP Masquerade Resource</A>
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<P>
<P>
<H2><A NAME="ss6.10">6.10 IP Æ©²á¥×¥í¥­¥·(IP Transparent Proxy)</A>
</H2>

<P>IP transparent proxy µ¡Ç½¤ò»È¤¨¤Ð¡¢Ê̤Υޥ·¥ó¤Ø¤Î¥µ¡¼¥Ó¥¹¥ê¥¯¥¨¥¹¥È¤ä
¥µ¡¼¥Ð¤Ø¤Î¥¢¥¯¥»¥¹¤ò¤³¤Î¥Þ¥·¥ó¤Ë¥ê¥À¥¤¥ì¥¯¥È¤¹¤ë¤³¤È¤¬¤Ç¤­¤Þ¤¹¡£¤³¤Îµ¡
ǽ¤Ï¡¢Linux ¥Þ¥·¥ó¤ò¥ë¡¼¥¿·ó¥×¥í¥­¥·¥µ¡¼¥Ð¤È¤·¤Æ»È¤Ã¤Æ¤¤¤ë¾ì¹ç¤ËÊØÍø¤Ç¡¢
³°Éô¤Î¥Í¥Ã¥È¥ï¡¼¥¯¤ØÍ׵ᤵ¤ì¤¿¥ê¥¯¥¨¥¹¥È¤òÁ´¤Æ¥í¡¼¥«¥ë¤Î¥×¥í¥­¥·¥µ¡¼¥Ð
¤Ç½èÍý¤Ç¤­¤ë¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡£
<P>
<P><B>¥«¡¼¥Í¥ë¤Î¥³¥ó¥Ñ¥¤¥ë¥ª¥×¥·¥ç¥ó</B>:
<BLOCKQUOTE><CODE>
<PRE>
        Code maturity level options  --->
                [*] Prompt for development and/or incomplete code/drivers
        Networking options  --->
                [*] Network firewalls
                ....
                [*] TCP/IP networking
                ....
                [*] IP: firewalling
                ....
                [*] IP: transparent proxy support (EXPERIMENTAL)
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>Æ©²á¥×¥í¥­¥·µ¡Ç½¤Ï <EM>ipfwadm</EM> ¥³¥Þ¥ó¥É¤ÇÀßÄꤷ¤Þ¤¹¡£
<P>ÌòΩ¤Á¤½¤¦¤ÊÀßÄêÎã¤ò°Ê²¼¤Ë¼¨¤·¤Æ¤ª¤­¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        root# ipfwadm -I -a accept -D 0/0 telnet -r 2323
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>¤³¤ÎÎã¤ò¼Â¹Ô¤·¤¿¾ì¹ç¡¢Ç¤°Õ¤Î¥Û¥¹¥È¤Î <CODE>telnet</CODE>(23 ÈÖ)¥Ý¡¼¥È¤ËÀܳ
¤·¤è¤¦¤È¤¹¤ë¤È¡¢Æ©²á¥×¥í¥­¥·¥Û¥¹¥È¤Î 2323 È֥ݡ¼¥È¤Ë¥ê¥À¥¤¥ì¥¯¥È¤µ¤ì¤Þ¤¹¡£
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ɬÍפ˱þ¤¸¤¿Æ°ºî¤ò¤µ¤»¤é¤ì¤Þ¤¹¡£
<P>¤µ¤é¤ËÌÌÇò¤¤Îã¤È¤·¤Æ¡¢Á´¤Æ¤Î <CODE>http</CODE> ¥È¥é¥Õ¥£¥Ã¥¯¤ò¥í¡¼¥«¥ë¤Î
¥­¥ã¥Ã¥·¥å¤Ë¥ê¥À¥¤¥ì¥¯¥È¤¹¤ë¤³¤È¤â¤Ç¤­¤Þ¤¹¡£¤·¤«¤·¡¢¥×¥í¥­¥·¥µ¡¼¥Ð¤¬»È
¤¦¥×¥í¥È¥³¥ë¤Ï¥Í¥¤¥Æ¥£¥Ö¤Î http: ¤È¤Ï°Û¤Ê¤ê¤Þ¤¹¡£¤Ä¤Þ¤ê¡¢http ¥¯¥é¥¤¥¢¥ó¥È
¤Ï <CODE>www.server.com:80</CODE> ¤ËÀܳ¤·¤Æ <CODE>/path/page</CODE> ¤òÍ׵ᤷ¤Þ¤¹¤¬¡¢
¥í¡¼¥«¥ë¥­¥ã¥Ã¥·¥å¤ËÀܳ¤·¤¿¾ì¹ç¤Ï <CODE>proxy.local.domain:8080</CODE> ¤ËÀܳ
¤·¤Æ <CODE>www.server.com/path/page</CODE> ¤òÍ׵ᤷ¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó¡£
<P><CODE>http</CODE> ¥ê¥¯¥¨¥¹¥È¤Ë¥í¡¼¥«¥ë¥×¥í¥­¥·¤Î¥Õ¥£¥ë¥¿¤ò¤«¤±¤ë¤Ë¤Ï¡¢
<CODE>transproxy</CODE> ¤È¸Æ¤Ð¤ì¤ë¾®¤µ¤Ê¥µ¡¼¥Ð(WWW ¤ÇÆþ¼ê¤Ç¤­¤Þ¤¹)¤ò´Ö¤ËÃÖ¤¤¤Æ¡¢
¥×¥í¥È¥³¥ë¤ò°ìÃפµ¤»¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£<CODE>transproxy</CODE> ¤ò 
8081 È֥ݡ¼¥È¤ÇÆ°ºî¤µ¤»¤ë¤Ë¤Ï¡¢°Ê²¼¤Î¥³¥Þ¥ó¥É¤ò¼Â¹Ô¤·¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        root# ipfwadm -I -a accept -D 0/0 80 -r 8081
        
</PRE>
</CODE></BLOCKQUOTE>
<P>¤³¤¦¤¹¤ë¤È¡¢<CODE>transproxy</CODE> ¤Ï³°Éô¥µ¡¼¥Ð¤Ë¥¢¥¯¥»¥¹¤·¤è¤¦¤È¤¹¤ëÁ´¤Æ¤ÎÀܳ¤ò
¼õ¤±¼è¤ê¡¢¥×¥í¥È¥³¥ë¤ÎÁê°ãÅÀ¤òľ¤·¤¿¸å¤Ë¡¢¤³¤ì¤ò¥í¡¼¥«¥ë¤Î¥×¥í¥­¥·¤ËÅÏ
¤·¤Þ¤¹¡£
<P>
<P>
<H2><A NAME="ss6.11">6.11 IPv6</A>
</H2>

<P>¤ä¤Ã¤È IP ¥Í¥Ã¥È¥ï¡¼¥¯¤Ë¤Ä¤¤¤ÆÍý²ò¤·»Ï¤á¤¿¤È¤³¤í¤À¤È¤¤¤¦¤Î¤Ë¡¢¥ë¡¼¥ë¤¬
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Protocol Version 6 ¤Î¾Êά·Á¤Ç¤¹¡£IPv6 ¤Ï¡¢¸½ºß¥¤¥ó¥¿¡¼¥Í¥Ã¥È¥³¥ß¥å¥Ë¥Æ¥£
¤¬Ä¾Ì̤·¤Æ¤¤¤ë IP ¥¢¥É¥ì¥¹¤Î¸Ï³éÌäÂê¤ËÂбþ¤¹¤ë¤³¤È¤ò¼çÌÜŪ¤Ë³«È¯¤µ¤ì¤Æ
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³°¤Ë¤â¡¢IPv6 ¤Ç¤Ï¼ç¤È¤·¤Æñ½ã²½¤Î¤¿¤á¤Î¤µ¤Þ¤¶¤Þ¤ÊÊѹ¹¤¬»Ü¤µ¤ì¤Æ¡¢´û¸
¤Î IPv4 ¥Í¥Ã¥È¥ï¡¼¥¯¤è¤ê¤â´ÉÍý¤·¤ä¤¹¤¤¤è¤¦¤Ë¤Ê¤Ã¤Æ¤¤¤Þ¤¹¡£
<P>Linux <CODE>2.2.*</CODE>¥·¥ê¡¼¥º¤Ë¤Ï¡¢´û¤Ë IPv6 ¤Î¼ÂÁõ¤¬Æ°ºî¤·¤Æ¤¤¤Þ¤¹¤¬¡¢
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<A HREF="http://www.terra.net/ipv6/">www.terra.net</A>
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<P>
<H2><A NAME="ss6.12">6.12 ¥â¥Ð¥¤¥ë IP(Mobile IP)</A>
</H2>

<P>¡ÖIP ¤Î²ÄÈÂÀ­(IP mobility)¡×¤È¤Ï¡¢¤¢¤ë¾ì½ê¤Ç¥¤¥ó¥¿¡¼¥Í¥Ã¥È¤ËÀܳ¤·¤Æ¤¤
¤ë¥Û¥¹¥È¤¬¡¢Ê̤ξì½ê¤Ë°Ü¤Ã¤Æ¤â IP ¥¢¥É¥ì¥¹¤òÊѹ¹¤»¤º¤ËÀܳ¤Ç¤­¤¿¤ê¡¢ÀÜ
³¤òÀڤ餺¤Ë¾ì½ê¤ò°ÜÆ°¤Ç¤­¤ë¤³¤È¤Ç¤¹¡£Ä̾IP ¥¢¥É¥ì¥¹¤ò³ä¤êÅö¤Æ¤é¤ì
¤Æ¤¤¤ë¥Û¥¹¥È¤Ï¡¢Àܳ¾ì½ê¤òÊѹ¹¤¹¤ì¤Ð IP ¥¢¥É¥ì¥¹¤âÊѹ¹¤·¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ
¤»¤ó¡£IP mobility µ¡Ç½¤ò»È¤¨¤Ð¡¢¥Ý¡¼¥¿¥Ö¥ë¥Þ¥·¥ó¤Ë¤â·è¤Þ¤Ã¤¿ IP ¥¢¥É¥ì
¥¹¤ò³ä¤êÅö¤Æ¡¢¼«Æ°¥ë¡¼¥Æ¥£¥ó¥°µ¡Ç½¤ÈIP ¥«¥×¥»¥ë²½(¥È¥ó¥Í¥ê¥ó¥°)µ¡Ç½¤ò
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<P>Linux ÍÑ¤Ë IP mobility ¥Ä¡¼¥ë°ì¼°¤ò³«È¯¤·¤è¤¦¤È¤¤¤¦¥×¥í¥¸¥§¥¯¥È¤¬¿Ê¹Ô
Ãæ¤Ç¤¹¡£¥×¥í¥¸¥§¥¯¥È¤Î¿Ê¹Ô¾õ¶·¤È¥Ä¡¼¥ë¤Ï
<A HREF="http://anchor.cs.binghamton.edu/~mobileip/">Linux Mobile IP Home Page</A>
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<P>
<H2><A NAME="ss6.13">6.13 ¥Þ¥ë¥Á¥­¥ã¥¹¥È</A>
</H2>

<P>Ä̾TCP/IP ¤ÏÀܳÀè¤Î¥Þ¥·¥ó¤ò»ØÄꤷ¤¿°ìÂаì¤ÎÀܳ·ÁÂÖ¤ò¼è¤ê¤Þ¤¹¤¬¡¢
IP ¥Þ¥ë¥Á¥­¥ã¥¹¥Èµ¡Ç½¤ò»È¤¨¤Ð¡¢°Û¤Ê¤ë IP ¥Í¥Ã¥È¥ï¡¼¥¯¾å¤Ë¤¢¤ëǤ°Õ¤Î¿ô
¤Î¥Û¥¹¥È¤Ø¡¢Æ±»þ¤Ë IP ¥Ç¡¼¥¿¥°¥é¥à¤òÁ÷¤ë¤³¤È¤¬²Äǽ¤Ë¤Ê¤ê¤Þ¤¹¡£¤³¤Îµ¡Ç½
¤Ï¡¢¥¤¥ó¥¿¡¼¥Í¥Ã¥ÈÁ´ÂΤز»À¼¤ä¥Ó¥Ç¥ª¤ÎÁǺà¤ò¡ÖÊüÁ÷¡×¤¹¤ë¤Ê¤É¡¢
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<P><B>¥«¡¼¥Í¥ë¤Î¥³¥ó¥Ñ¥¤¥ë¥ª¥×¥·¥ç¥ó</B>:
<BLOCKQUOTE><CODE>
<PRE>
Networking options  --->
        [*] TCP/IP networking
        ....
        [*] IP: multicasting
</PRE>
</CODE></BLOCKQUOTE>
<P>IP ¥Þ¥ë¥Á¥­¥ã¥¹¥È¤ò»È¤¦¤Ë¤Ï¡¢¥Ä¡¼¥ë°ì¼°¤È¿¾¯¤Î¥Í¥Ã¥È¥ï¡¼¥¯¤ÎÀßÄ꤬ɬ
ÍפǤ¹¡£Linux ¤Î¥Þ¥ë¥Á¥­¥ã¥¹¥ÈÂбþ¤Ë´Ø¤¹¤ë¾Ü¤·¤¤¾ðÊó¤Ë¤Ä¤¤¤Æ¤Ï
<A HREF="Multicast-HOWTO.html">Multicast-HOWTO</A>
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<P>
<H2><A NAME="ss6.14">6.14 NAT - ¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹ÊÑ´¹(Network Address Translation)</A>
</H2>

<P>IP ¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹ÊÑ´¹µ¡Ç½(NAT)¤Ï¡¢Linux ¤Î IP ¥Þ¥¹¥«¥ì¡¼¥Éµ¡Ç½¤Î
·»µ®Ê¬¤¬É¸½à²½¤µ¤ì¤¿¤â¤Î¡¢¤È»×¤Ã¤Æ¤À¤¤¤¿¤¤¤«¤Þ¤¤¤Þ¤»¤ó¡£NAT ¤Ï RFC-1631 
¤Ç¾Ü¤·¤¯»ÅÍͤ¬·è¤á¤é¤ì¤Æ¤¤¤Þ¤¹(RFC ʸ½ñ¤Ï¤ª¶á¤¯¤Î RFC ¥¢¡¼¥«¥¤¥Ö¤«¤éÆþ
¼ê¤·¤Æ¤¯¤À¤µ¤¤)¡£NAT ¤Ë¤Ç¤­¤Æ IP ¥Þ¥¹¥«¥ì¡¼¥É¤Ë¤Ï¤Ç¤­¤Ê¤¤µ¡Ç½¤¬¤¢¤ë¤Î
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¤ÎÊý¤¬¤º¤Ã¤ÈŬÀڤǤ¹¡£
<P>Linux 2.0.29 ÍѤΠNAT ¤Î¥¢¥ë¥Õ¥¡ÈǤμÂÁõ¤Ï Michael.Hasenstein
<CODE>Michael.Hasenstein@informatik.tu-chemnitz.de</CODE> ¤¬³«È¯¤·¤Þ¤·¤¿¡£
Michaels ¤¬ºîÀ®¤·¤¿Ê¸½ñ¤È¼ÂÁõ¤Ï°Ê²¼¤Î¾ì½ê¤«¤éÆþ¼ê¤Ç¤­¤Þ¤¹:
<P>
<A HREF="http://www.csn.tu-chemnitz.de/HyperNews/get/linux-ip-nat.html">Linux IP Network Address Web Page</A><P>¿·¤·¤¤ Linux 2.2.x ¤Ç¤â¡¢·ÐÏ©À©¸æ¥¢¥ë¥´¥ê¥º¥à¤Ë NAT µ¡Ç½¤Î°ìÉô¤¬Æþ¤Ã¤Æ
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<P>
<H2><A NAME="ss6.15">6.15 Traffic Shaper - µö²Ä¤¹¤ëÂÓ°èÉý¤ÎÊѹ¹</A>
</H2>

<P>traffic shaper ¤Ï¡¢¥æ¡¼¥¶¤¬ÄêµÁ¤·¤¿¤è¤¦¤Ë¥È¥é¥Õ¥£¥Ã¥¯¤òÀ©¸Â¤¹¤ë¥¤¥ó
¥¿¥Õ¥§¡¼¥¹¥Ç¥Ð¥¤¥¹¤ò¿·¤·¤¯ºîÀ®¤¹¤ë¥É¥é¥¤¥Ð¤Ç¤¹¡£¤³¤Î¥Ç¥Ð¥¤¥¹¤Ï¡¢¼ÂºÝ¤Î
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<P>
<P>traffic shaper ¤Ï Linux 2.1.15 ¤ÇƳÆþ¤µ¤ì¡¢Linux 2.0.36 ¤Ë
¥Ð¥Ã¥¯¥Ý¡¼¥È(ÌõÃí: ³«È¯ÈÇ¥«¡¼¥Í¥ë¤Îµ¡Ç½¤ò°ÂÄêÈÇ¥«¡¼¥Í¥ë¤Ë°Ü¿¢¤¹¤ë¤³¤È)
¤µ¤ì¤Þ¤·¤¿(traffic shaper ¤Ï¡¢Alan Cox ¤¬ÇÛÉÛ¤·¤Æ¤¤¤ë
<CODE>2.0.36-pre-patch-2</CODE> ¤Ë´Þ¤Þ¤ì¤Æ¤¤¤Þ¤¹¡£Alan Cox ¤Ï Linux 2.0 ÍѤÎ
shaper ¥Ç¥Ð¥¤¥¹¤Îºî¼Ô¤Ç¤¢¤ê¥á¥ó¥Æ¥Ê¤Ç¤¹)¡£
<P>
<P>traffic shaper ¤Ï¥â¥¸¥å¡¼¥ë¤È¤·¤Æ¥³¥ó¥Ñ¥¤¥ë¤·¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó¡£
¤³¤Î¥Ç¥Ð¥¤¥¹¤Ï <EM>shapecfg</EM> ¥³¥Þ¥ó¥É¤ò°Ê²¼¤Î¤è¤¦¤Ë»È¤Ã¤ÆÀßÄꤷ¤Þ¤¹:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        shapecfg attach shaper0 eth1
        shapecfg speed shaper0 64000
        
</PRE>
</CODE></BLOCKQUOTE>
<P>
<P>shaper ¥Ç¥Ð¥¤¥¹¤ÏÁ÷¿®¤¹¤ë¥È¥é¥Õ¥£¥Ã¥¯¤ÎÂÓ°èÉý¤ÎÀ©¸æ¤·¤«¤Ç¤­¤Þ¤»¤ó¡£
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<P>Linux 2.2 ¤ÏºÇ½é¤«¤é¤³¤Î¤è¤¦¤Ê·ÐÏ©À©¸æ¤ËÂбþ¤·¤Æ¤¤¤Þ¤¹¡£Linux 2.0 
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¤³¤Î¥Ñ¥Ã¥Á¤Ï <CODE>ftp.invlogic.com</CODE> ¤Ë¤¢¤ê¤Þ¤¹¡£shaper ¥Ç¥Ð¥¤¥¹¤Ë´Ø¤¹¤ë
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<H2><A NAME="ss6.16">6.16 Linux 2.2 ¤Ë¤ª¤±¤ë·ÐÏ©À©¸æ</A>
</H2>

<P>ºÇ¿·ÈǤΠLinux ¤Ç¤¢¤ë¥Ð¡¼¥¸¥ç¥ó 2.2 ¤Ç¤Ï¡¢·ÐÏ©À©¸æ¤Î¥Ý¥ê¥·¡¼¤ÏÈó¾ï¤Ë½À
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