route to deferent gateways depend on the protocol

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 ?

thanks
Kev
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Re: route to deferent gateways depend on the protocol

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 ?

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





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Re: route to deferent gateways depend on the protocol

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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Re[2]: route to deferent gateways depend on the protocol

> 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.

im testing with iptables, if things go right, i will let you all knows,
if any one know how to do this, plz let me know :)

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Sent on 21/12/2004 by Kev to Ray Olszewski (ray@comarre.com).

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