/etc/network/if-up.d/ip is in vlan 1.9-3.2ubuntu1.
This file is owned by root:root, with mode 0o755.
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 | #!/bin/sh
# This should probably go into ifupdown
# But usually only those with lots of interfaces (vlans) need these
if [ -d "/proc/sys/net/ipv4/conf/$IFACE" ]
then
if [ -n "$IF_IP_PROXY_ARP" ]; then
if [ "$IF_IP_PROXY_ARP" -eq "1" ]; then
echo 1 > "/proc/sys/net/ipv4/conf/$IFACE/proxy_arp"
else
echo 0 > "/proc/sys/net/ipv4/conf/$IFACE/proxy_arp"
fi
fi
if [ -n "$IF_IP_RP_FILTER" ]; then
if [ "$IF_IP_RP_FILTER" -eq "0" ]; then
echo 0 > "/proc/sys/net/ipv4/conf/$IFACE/rp_filter"
else
echo 1 > "/proc/sys/net/ipv4/conf/$IFACE/rp_filter"
fi
fi
fi
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