/lib/systemd/system/isc-dhcp-relay6.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 17 18 19 20 21 | [Unit]
Description=ISC DHCP IPv6 relay
Documentation=man:dhcrelay(8)
Wants=network-online.target
After=network-online.target
After=time-sync.target
ConditionPathExists=/etc/default/isc-dhcp-relay6
[Service]
EnvironmentFile=/etc/default/isc-dhcp-relay6
ExecStart=/bin/sh -ec '\
if [ -z "$LOWER_INTERFACES" ] || [ -z "$UPPER_INTERFACES" ]; then \
echo "No interface defined in /etc/default/isc-dhcp-relay6! - Aborting..."; \
exit 0; \
fi; \
for I in $LOWER_INTERFACES; do IFCMD="$IFCMD -l $I"; done; \
for I in $UPPER_INTERFACES; do IFCMD="$IFCMD -u $I"; done; \
exec /usr/sbin/dhcrelay -d -6 $OPTIONS $IFCMD'
[Install]
WantedBy=multi-user.target
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