----- Original Message -----
From: "Ian C. Sison" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, October 28, 2002 8:26 PM
Subject: Re: [plug] question on routing using 2 gateways
> On Mon, 28 Oct 2002, fooler wrote:
>
> > ----- Original Message -----
> > From: "Rikki T. Vizcarra" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Monday, October 28, 2002 1:29 PM
> > Subject: [plug] question on routing using 2 gateways
> >
> >
> > > My question is, how come, when I route to ISPONE gateway, both
connections
> > > are perfectly fine? But when I route to ISPTWO gateway, only ISPTWO
> > > connection can be seen!?
> >
> > what happening here is that ispone ip block is still routable for
outgoing
> > traffic going to isptwo(except if your isptwo or its ascendants
implemented
> > ingress filtering where to allow only to pass those ip addresses known
to
> > them and drop it otherwise).... upon returning (where the source ip
address
> > is now the destination ip address), it will pass thru to ispone and not
to
> > isptwo... in case you temporarily down your ispone link, you will not
> > receive any packets coming from ispone segment block even if you change
> > their default gateway to isptwo...
> >
>
> Correct. So to get routing up on both interfaces you need to use 'route by
> source', and ip rules
>
> for instance:
>
> ip route add default via gw-of-isp1 dev eth0 table 90
> ip route add default via gw-of-isp2 dev eth1 table 91
>
> ip rule add from ip-address-of-isp1/32 lookup 90
> ip rule add from ip-address-of-isp2/32 lookup 91
>
Thanks guys... i'll try this out... :)
_
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