[ILUG] Routing.

[Mark Kilmartin]

I know that the firewall is not dropping them.

But I can't be sure of the ISPs routers.

It makes sense (sort of) to me that a route that see traffic coming from
a.b.c.x but it knows that it should only see traffic from d.e.f.x then
it would drop it?

If anybody can tell me I'm wrong here I will be glad.

MArk

On Wed, 2002-01-16 at 11:25, Martin Feeney wrote:
> On Tue, 15 Jan 2002 18:32:09 Dave Wilson wrote:
> 
> > I'm more familiar with cisco than linux routing, but: since the reply is
> > actually a new IP packet, then regardless of its source address [a.b.c.1
> > or
> > d.e.f.1] it will be sent to the default route. I'm not aware of any way
> > in
> > Linux to route based on source address.
> 
> Turn on CONFIG_IP_ADVANCED_ROUTER in the kernel and install iproute2 if you
> want to do source-based routing.
> 
> However, it shouldn't matter to the client that the reverse route is 
> different(it doesn't under NT4, win2k and linux 2.4.17 anyway) as long as 
> the replies come back in via the same interface (on the client) and from 
> the address it's supposed to come from.
> 
> Is your firewall blocking packets from a.b.c.1 from going out via the 
> d.e.f.x interface?
> 
> Get your firewall to log all packets it drops with a helpful log prefix and
> see if that sheds some light on the situation.
> 
> Martin.
> 
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