Howto:multiple Default Routes

Thanks to PhoenixHelp I is able to setup multiple default routes, or a default route per Network/interface to being precise, in debian/l Inux It is as simple as that:

/etc/network/interfaces
Code:

Iface eth0 inet static    address 10.0.0.1    netmask 255.255.255.0    gateway 10.0.0.254iface eth1 inet Static    Address 20.0.0.1    netmask 255.255.255.0    Gateway 20.0.0.254

That would was example topology (but more then 2 interfaces was also possible).
Code:

NETWORK0                      NETWORK1         \                            /          \                          /           \                        /            \                      /             \                    /          ROUTER0             ROUTER1          10.0.0.254          20.0.0.254              \                  /        +------\----------------/------+        |       \              /       |        |       Em0          em1       |        |    10.0.0.1     20.0.0.1        |         | | | FREEBSD BOX          |        |                              |        +------------------------------+

Now, you can don't use the ' casual 'defaultrouter= "X"cause it 'll be is only for one network.

We 'll have the use setfib (1)To create both (or more) Separete routing tables per network/interface.

ADD these lines to/boot/loader.confFile:
Code:

Ipfw_load= "YES" net.fibs=16

It'll unfortunately require kernel recompile, but it 's not as this hard:
Code:

# cd/usr/src/sys/$ (uname-m)/conf# cp generic/root/routes# ln-s/root/routes# echo "Options routetables=16" >> routes# cd/usr/src# make No_modules=1 kernel kernconf=routes kodir=/boot/routes# mv/boot/routes/kernel/boot/kernel/ kernel# reboot

We can of course set 2 instead of a, but you'll at least has to recompile Your kernel again and reboot which are no T very handy ...

Nest Set your networks/interfaces as usual in/etc/rc.confFile:
Code:

ifconfig_em0= "inet 10.0.0.1/24" ifconfig_em1= "inet 20.0.0.1/24" # check/etc/rc.local for default routes

All the rest of the configuration resides in/etc/rc.localFile:
Code:

# define default ROUTESSETFIB 0 route Delete defaultsetfib 0 route add    default 10.0.0.254setfib 1 route Delete default  Setfib 1 route Add    default 20.0.0.254# assing route tables to interfacesipfw-f FLUSHIPFW add allow IP from any to    Any via LO0IPFW add SETFIB 1 IPs from any to all via EM0IPFW add SETFIB 0 IP from any to all via EM1IPFW add Allow    IP From any to any

these would is handy for restarting:
Code:

#/etc/rc.d/netif restart#/etc/rc.d/local Restart

Source: >  

From for notes (Wiz)

Howto:multiple Default Routes