/usr/src/xtables-addons-2.12/extensions/libxt_DHCPMAC.man is in xtables-addons-dkms 2.12-0.1.
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In conjunction with ebtables, DHCPMAC can be used to completely change all MAC
addresses from and to a VMware-based virtual machine. This is needed because
VMware does not allow to set a non-VMware MAC address before an operating
system is booted (and the MAC be changed with `ip link set eth0 address
aa:bb..`).
.TP
\fB\-\-set\-mac\fP \fIaa:bb:cc:dd:ee:ff\fP[\fB/\fP\fImask\fP]
Replace the client host MAC address field in the DHCP message with the given
MAC address. This option is mandatory. The \fImask\fP parameter specifies the
prefix length of bits to change.
.PP
EXAMPLE, replacing all addresses from one of VMware's assigned vendor IDs
(00:50:56) addresses with something else:
.PP
iptables \-t mangle \-A FORWARD \-p udp \-\-dport 67 \-m physdev
\-\-physdev\-in vmnet1 \-m dhcpmac \-\-mac 00:50:56:00:00:00/24 \-j DHCPMAC
\-\-set\-mac ab:cd:ef:00:00:00/24
.PP
iptables \-t mangle \-A FORWARD \-p udp \-\-dport 68 \-m physdev
\-\-physdev\-out vmnet1 \-m dhcpmac \-\-mac ab:cd:ef:00:00:00/24 \-j DHCPMAC
\-\-set\-mac 00:50:56:00:00:00/24
.PP
(This assumes there is a bridge interface that has vmnet1 as a port. You will
also need to add appropriate ebtables rules to change the MAC address of the
Ethernet headers.)
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