Sorry for not responding earlier, I've been *extremely* busy.
On Fri, 6 Apr 2001, Josh Sides wrote:
> I would like to put 3 different ip addresses that are in three different
> subnets on the same interface. The interface is directly connected to a
> cable modem. These ip addresses are assigned to me by my ISP. How do I set
> up the routing on my linux machine so that all three addresses are reachable
> from the internet.
The simple recipe (in pseudocode, hope this is clear enough):
0. put the ip addresses on the interfaces:
for each ip/mask:
ip address add <ip/mask> dev <device>
1. set up the default routing table:
for each ip/mask:
ip route add <gw_for_ip> src <ip> dev <device>
ip route add default scope global \
nexthop via <gw_for_ip1> \
nexthop via <gw_for_ip2> \
nexthop via <gw_for_ip3>
(etcetera)
2. set up policy routing tables for each of the ip addresses:
for each ip/mask:
ip route add <ip/mask> dev <device> table <table_for_ip>
ip route add default via <gw_for_ip> table <table_for_ip>
3. set up rules to select the correct outgoing routes
for each ip/mask:
ip rule add from <ip/mask> table <table_for_ip> \
prio <arbitrary unique low number>
> Is it possible to setup multiple default routes?
More or less, yes. See in the recipe. :)
Doei, Arthur.
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