On Mon, 20 Dec 2004, Ray Olszewski wrote:

> At 02:17 PM 12/20/2004 +0600, Kev wrote:
> >Hi all,
> >
> >is it possible to route to deferent gateways depend on the protocol (Eg:SMTP)
> >using Linux routing tabes or iptabels, if so does any one know how to do
> >it ?

For registerd services one could try to filter and redirect based on
src/dest port but that is not rocksolid. Is the smtp server at your
intranet or internet side ? If it's in your local net shouldn't be much of
a problem.. with iptables or pf. 

> With respect to routing tables, the answer is a definite no. Routing tables 
> operate only at the IP-address level (network layer), and protocols are the 
> next level up (transport layer -- TCP or UDP).
> 
> With respect to iptables ... I cannot immediately think of a way to do 
> this, but iptables offers an awful lot of flexibility, so I would not rule 
> out some tricky solution, especially in a context where the gateways are 
> NATing routers. But I have nothing specific to suggest.
> 
> >thanks
> >Kev

J.

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