Has anyone got a transparent proxy working on a router / firewall,
in a similar way to how a transparent squid proxy is setup up with
an ipchains port 80 redirect?
(I want to capture all --dport 25 traffic coming out of a subnet,
and force it all though the local mail server which I want to act as
an outgoing relay host).
Doing the actual port redirection is trivial, but my problem is in
getting a local sendmail daemon to handle it in a sane way (it
doesn't seem to work at all, or at least not how I think it should).
If anyone has this working, I'd really like to know how it is done.
(Any pointers to further information is also welcome).
Thanks.
[ apologies to ask this off-topic question here, I'd normally ask
this somewhere like linux-config or linux-net, but I've yet to
resubscribe to the vger lists since it has moved over to
kernel.org ]
Cheers
Tony
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