![nanog logo](/images/nanog-logo.png)
nanog mailing list archives
Re: SMTP spoofing ?
From: miquels () cistron nl (Miquel van Smoorenburg)
Date: 19 Feb 1998 19:52:16 +0100
In article <Pine.BSI.3.91.980219115057.13529A-100000 () ivan iecc com>, John R Levine <johnl () iecc com> wrote:
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. Mike. -- Miquel van Smoorenburg | The dyslexic, agnostic, insomniac lay in his bed miquels () cistron nl | awake all night wondering if there is a doG
Current thread:
- SMTP spoofing ? John R Levine (Feb 19)
- Re: SMTP spoofing ? Perry E. Metzger (Feb 19)
- Re: SMTP spoofing ? John R Levine (Feb 19)
- Re: SMTP spoofing ? Jon Lewis (Feb 19)
- Re: SMTP spoofing ? Miquel van Smoorenburg (Feb 20)
- Re: SMTP spoofing ? Steven L. Johnson (Feb 23)
- <Possible follow-ups>
- Re: SMTP spoofing ? sully (Feb 19)
- Re: SMTP spoofing ? Owen DeLong (Feb 20)
- Re: SMTP spoofing ? Perry E. Metzger (Feb 19)