Elsewhere
Food for thought ...
- May also want to
add to rc2.d?
For highly redundant server/network setups, need a way to route traffic
sensibly when there are two or more equally cabably network interfaces
connected to the Internet.
Typically such a setup would include a load-balancer upstream of the server which
has dual network adaptors.
Enter special service multi-home-route to setup and remove routes
and rules to accomplish this.
# ip route
192.168.221.0/24 dev eth0 proto kernel scope link src 192.168.221.100
default via 192.168.221.254 dev eth0
# ip rule
0: from all lookup 255
32766: from all lookup main
32767: from all lookup default
# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=morbo.mdstage.com
# GATEWAY=192.168.221.254 <- remove this
# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet
DEVICE=eth0
BOOTPROTO=static
BROADCAST=192.168.221.255
HWADDR=00:1A:A0:38:5F:3E
IPADDR=192.168.221.100
NETMASK=255.255.255.0
NETWORK=192.168.221.0
GATEWAY=192.168.221.254 <- add this
ONBOOT=yes
# cat /etc/sysconfig/network-scripts/ifcfg-eth1
# Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet
DEVICE=eth1
BOOTPROTO=static
BROADCAST=192.168.222.255
HWADDR=00:1A:A0:38:5F:40
IPADDR=192.168.222.100
NETMASK=255.255.255.0
NETWORK=192.168.222.0
GATEWAY=192.168.222.254 <- add this
ONBOOT=yes
# cat /etc/iproute2/rt_tables
#
# reserved values
#
255 local
254 main
253 default
0 unspec
#
# local
#
#1 inr.ruhep
21 connection1 <- add this
22 connection2 <- add this
# who -r
run-level 3 2009-10-06 16:28 last=S |
# cd /etc/rc.d
# grep -R multi- *
init.d/multi-home-route:# multi-home-route ...
init.d/multi-home-route:# description: ...
rc3.d/S11multi-home-route:# multi-home-route ...
rc3.d/S11multi-home-route:# description: ...
rc5.d/S11multi-home-route:# multi-home-route ...
rc5.d/S11multi-home-route:# description: ...
$ ls -lh /etc/rc.d/rc3.d/*multi-home*
lrwxrwxrwx 1 root root 26 Oct 7 16:37
/etc/rc.d/rc3.d/S11multi-home-route -> ../init.d/multi-home-route
$ ls -lh /etc/rc.d/rc5.d/*multi-home*
lrwxrwxrwx 1 root root 26 Oct 7 16:38
/etc/rc.d/rc5.d/S11multi-home-route -> ../init.d/multi-home-route
# ip route
192.168.221.0/24 dev eth0 proto kernel scope link src 192.168.221.100
192.168.222.0/24 dev eth1 proto kernel scope link src 192.168.222.100
169.254.0.0/16 dev eth1 scope link
default via 192.168.222.254 dev eth1
# ip rule
0: from all lookup 255
10: from 192.168.221.0/24 lookup connection1
20: from 192.168.222.0/24 lookup connection2
32766: from all lookup main
32767: from all lookup default |
