Re: [LARTC] Newbie question

["suresh" <super772002@yahoo.com>]

Hi  Ard,
Actually i need to distribute the traffic to two different routers.
So I tried to send traffic from 172.16.1.0/24 to a.b.c.d and another network
through
w.x.y.z

Thanks
Suresh

> On Wed, Feb 27, 2002 at 04:29:23PM +0530, suresh wrote:
> > I have two Internet link and two LAN networks
> > I have Redhat-7.1 linux-2.4.17 kernel and 2 NICs
> > In eth0 172.16.1.1 and eth0:1 192.168.1.1
> > in eth1 are public ips of isps as eth1 a.b.c.d and eth1:0 w.x..y.z
> >
> > I want do source routing using ip rule command.
> >
> > echo 200 isp1 >> /etc/iproute2/rt_tables
> > ip rule add from 172.16.1.0/24 table isp1
> > ip rule ls
> > 0:      from all lookup local
> > 32765:  from 172.16.1.0/24 lookup isp1
> > 32766:  from all lookup main
> > 32767:  from all lookup default
> >
> > ip route add default via a.b.c.d dev eth1 table isp1
> > ip route flush cache
> >
> > Its work fine when request comes from 172.16.1.0 netwok
> >
> > When i add
> > ip route add default via w.x.y.z dev eth1
> >
> > to forward request from another lan network it works fine
> > but req from 172.16.1.0 does not work
> >
> > if i remove
> > ip route del default via w.x.y.z dev eth1
> >
> > its work well.
> >
> > Did i leaveout anything in configuration?
> Yep: by adding the rule:
> ip rule add from 172.16.1.0/24 table isp1
> everything *WILL* go to table isp1.
> In my experience everything even local traffic that matches the rule
> will go to the isp1 table, and hence will be routed to the gateway.
>
> Use a normal routing table for isp1:
> For instance:
> ip route add 172.16.1.0/24 dev {right device} scope link
> to make sure that you can still route back to 172.16.1.0...
>
> Anyway: tcpdumping all of your interfaces will make you clear what is
> actually happenning.
>
> Thinking about it: it only contains a default route, which means, it
> only knows that it should route to that default gateway.
> The default is I guess some sort of end point in a routing table.
>
> --
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