[Gllug] IPCop and port forwarding

[Murray]

ipcop$ tail -f /var/log/messages
external$ telnet 213.253.36.55 25

if it's not showing up in there, it probably isn't the ipcop box that's
blocking it. do you have an adsl modem or anything doing nat inbetween?

if it is, it'll show you the source/dest ip & ports, as well as whether it's
blocking on INPUT or OUTPUT.

ipcop 1.2 is ipchains
ipcop 1.3 is iptables

> -----Original Message-----
> From: gllug-admin at linux.co.uk [mailto:gllug-admin at linux.co.uk]On Behalf
> Of Xander D Harkness
> Sent: 04 June 2003 19:05
> To: gllug at linux.co.uk
> Subject: [Gllug] IPCop and port forwarding
>
>
> I have set up IPCop 1.2 (and 1.3) with port forwarding port 25 on its
> red interface through to an internal IP address on a mail server.
>
> I have enabled external access for that port.
>
> When I try telnet IPaddress 25 from an external box I get a time out.
>
> I can ping the IP address on the IP cop box.  I can also see the NAT
> session under connections; however I always get a time out.  I have
> tried port 50000 to port 25 and get the same.
>
> If I put the mail server on the public IP I can talk to it.
>
> I am going to wander off to prod the network with ethereal; however I
> was hoping that someone might have some bright ideas.  My ISP here is
> Claranet  and the IP address if you feel the desire to prod is
> 213.253.36.55
>
> Kind regards
> Xander
>
>
>
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>
>


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