/lib/systemd/system/isc-dhcp-relay.service is in isc-dhcp-relay 4.3.5-3ubuntu7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | [Unit]
Description=ISC DHCP IPv4 relay
Documentation=man:dhcrelay(8)
Wants=network-online.target
After=network-online.target
After=time-sync.target
ConditionPathExists=/etc/default/isc-dhcp-relay
[Service]
EnvironmentFile=/etc/default/isc-dhcp-relay
ExecStart=/bin/sh -ec '\
for I in $INTERFACES; do IFCMD="$IFCMD -i $I"; done; \
exec /usr/sbin/dhcrelay -d -4 $OPTIONS $IFCMD $SERVERS'
[Install]
WantedBy=multi-user.target
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