[c-nsp] SMTP Redirection

[Matt Stockdale]

Take a look at

http://www.cisco.com/en/US/tech/tk648/tk361/tk438/tsd_technology_support_sub-protocol_home.html

Depending on your device and IOS, you might find the answer there.
Unfortunately, I've not used NAT on IOS, so I can't offer much more
help.

A little googling turned up

http://www.grape-info.com/doc/cisco/router/contents/example-tproxy.html

although it's more targeted at port 80, but if you can find a smtp proxy
with a transparent mode, that might be the ticket.

play around with "cisco smtp transparent proxy" as a search string, you
might hit on something.

Matt


On Fri, 2006-06-30 at 14:44 -0400, Paul Stewart wrote:
> Thanks... We use access-lists today and they work fine.... But yes,
> something transparent.
> 
> I've seen it applied with hotel applications when you check in as a
> guest and never have to change your mail settings etc.... Looking for
> something hopefully that can be used in IOS (or other Cisco device) to
> do the same...
> 
> Paul
>  
> 
> -----Original Message-----
> From: Matt Stockdale [mailto:mstockda at logicworks.net] 
> Sent: Friday, June 30, 2006 2:41 PM
> To: Paul Stewart
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] SMTP Redirection
> 
> Well, there is the obvious use of an access list to prevent them from
> using anything other than the one you want, which to me meets the
> definition of "forcefully", but I'm guessing you are looking for
> something transparent?
> 
> Matt
> 
> On Fri, 2006-06-30 at 14:16 -0400, Paul Stewart wrote:
> > Hi there..
> > 
> > I've been trying to find a way using Cisco IOS to forcefully redirect 
> > SMTP traffic to a specified source.  So we have 1000 users at a remote
> 
> > site for example and some want to use specific SMTP servers for 
> > sending out mail but we want to force their SMTP traffic to our mail
> server ...
> > Just an example...
> > 
> > Anything creative that can do this in IOS?
> > 
> > Thanks,
> > 
> > Paul Stewart
> > Network Administrator
> > Nexicom Inc.
> > http://www.nexicom.net/
> > 
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