I believe that you could get away with a really cheap standard Linksys router if you weren't looking to spend a lot of cash, the config would be somewhat of a kludge to have work properly, but I'm pretty sure it can be done.. Lots of routers do port forwarding, so you don't necessarily need a Cisco to pull this off if you wanted a more straightforward solution. IMO, every Internet server should be behind a port blocking router, otherwise you may very well end up hacked through some open port exploit, so a router has many advantages besides this one thing.
Matt
Gary Brumm wrote:
SBC just blocked port 25 for their dynamically assigned DSL users. I can have those users switch to SBC's SMTP servers but I have
been meaning to open up port 587 for my users that travel. I was wondering what software solutions you guys have been using (like the ones suggested below) and if there are any problems associated with doing it via software on the IMail machine as opposed to doing it with a hardware firewall. If it is a software solution it must run as a service.
Thanks,
Gary
At 09:38 AM 8/27/2004, you wrote:
[EMAIL PROTECTED] wrote:
Jim,
If your firewall supports it, I'd suggest port remapping on the firewall.
Have any port translated to IMail on port 25.
You could achieve the same solution using a port redirector software on your IMail box.
There is a bunch of Port Forwarder/Redirector Softwares available, e.g.
PortTunnel by http://www.steelbytes.com/
or
Fpipe by http://www.foundstone.com/index.htm?subnav=resources/navigation.htm&subcontent=/resources/freetools.htm
I gave FPipe a shot, and while it does work, IMail sees the redirected traffic as coming from itself, which will defeat my relaying setting. While that may not be a problem at the moment, some time in that not-so-distant future, some spammer may become clever enough to start relaying traffic through port 587, and I will become an open relay.
Is there a redirector that does preserve the source IP, or is that even possible?
-- A. Clausen [EMAIL PROTECTED]
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