You might try working something out with your bandwidth provider so that
you could NAT your network. Mine does work on NAT, but I'm not a Cisco
expert so I don't know if there is another way to do this.
Matt
Gary Brumm wrote:
Hi Matt,
Thanks for the reply. I have a main Cisco router where ports
can be blocked as well as some hardware firewalls (Sonicwall) on
various subnets. Port forwarding can be done if you are in NAT mode
but these will not do a port redirection which is what I need.
Each domain on the email server is on it's own live IP so NAT is not a
solution for me. In any case I would never hang something a critical
as an email server on a $50 Linksys router. It would be nice if you
could add an alternate port in the IMail configuration but I wouldn't
hold my breath for any solution from IPSwitch. I will probably need
to use some software port redirection software on the email server
itself. I was just trying to find out what others were using and what
(if any) problems were created by doing this.
Gary
At 10:38 AM 1/23/2005, you wrote:
Unless you have a reason why you would want to use another piece of
software for validating addresses (very necessary these days), you
are probably going to want something that is software and does port
forwarding, but not another MTA of some sort. I don't know of any
port forwarding software that isn't some form of a firewall or
proxy. Maybe someone else knows better about what is available.
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
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