Two or more network interfaces

Based on the Thomas-Krenn-Wiki

Suppose that we have a system with already configured network interface eth0 and we want to add another interface eth1 with address a.a.a.a from network n.n.n.n/22 and gateway g.g.g.g.

• Add eth1 data to /etc/rc.d/rc.inet1.conf. Do not change the gateway.

• Add a routing table to /etc/iproute2/rt_tables:

#
# reserved values
#
255     local
254     main
253     default
0       unspec
#
# local
#
#1      inr.ruhep
1 rt2

• Add

if ! /sbin/ip route list table rt2 | grep "^default via g.g.g.g dev eth1" 1> /dev/null ; then
  /sbin/ip route add n.n.n.n/22 dev eth1 proto kernel src a.a.a.a table rt2
  /sbin/ip route add default via g.g.g.g dev eth1 metric 1 table rt2
fi

to the end of the function gateway_up in /etc/rc.d/rc.inet1

• # /etc/rc.d/rc.inet1 restart

• $ /sbin/ip route list table rt2

• Add

if ! /usr/sbin/ip rule show | grep "a.a.a.a lookup rt2" 1> /dev/null ; then
  /usr/sbin/ip rule add from a.a.a.a/32 table rt2
  /usr/sbin/ip rule add to a.a.a.a/32 table rt2
fi

to /etc/rc.d/rc.firewall

• # /etc/rc.d/rc.firewall restart

• $ /sbin/ip rule show