25 lines (24 with data), 569 Bytes
#!/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