udp ports thorugh a firewall

07-31-2006, 01:57 AM

I'm using ipcop and have portsentry running on an internal mail
gateway. Every once in a while I see portsentry triggering on a UDP
packet coming in for port 32770. If I'm not explicitly forwarding
these udp ports to the mail gateway, how are they getting through?

08-03-2006, 03:19 AM

bl8n8r wrote:

> I'm using ipcop and have portsentry running on an internal mail
> gateway. Every once in a while I see portsentry triggering on a UDP
> packet coming in for port 32770. If I'm not explicitly forwarding
> these udp ports to the mail gateway, how are they getting through?

Sic some network sniffer tools on that one.

joseph2k

08-05-2006, 12:50 AM

joseph2k wrote:
> bl8n8r wrote:
>
> > I'm using ipcop and have portsentry running on an internal mail
> > gateway. Every once in a while I see portsentry triggering on a UDP
> > packet coming in for port 32770. If I'm not explicitly forwarding
> > these udp ports to the mail gateway, how are they getting through?
>
> Sic some network sniffer tools on that one.
>
> joseph2k

tcpdump -s0 -xX udp dst port 32770 and port ... ?

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