Are there any routers currently available that can do port 25 spoofing for
dialup users? That is, when the user attempts to connect to port 25
anywhere, he in fact connects to port 25 on your own SMTP server instead.
In case it's not obvious, it's for spam management.
Regards,
John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies",
Information Superhighwayman wanna-be, http://iecc.com/johnl, Sewer Commissioner
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Are there any routers currently available that can do port 25 spoofing for
dialup users? That is, when the user attempts to connect to port 25
anywhere, he in fact connects to port 25 on your own SMTP server instead.
Cisco? Just setup a routemap with an access list that matches TCP port
25, and sets next-hop to a box that supports `transparent proxying'.
Linux does, and AFAIK the *BSD's can do it as well.
Some squid users are doing this with port 80 to redirect HTTP traffic
through the caching proxy - there's some docs for it on http://squid.nlanr.net/
in the FAQ, read the section about "transparent proxying".
However I think that policy routing is still process switched, and as
such can use a lot of CPU on the router.