[Gllug] Firewalls suddenly blocking port 80? But how? And how can I check with no web access which device?

[Tethys]

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"M.Blackmore" writes:

>1. How can someone with *very little* command line skill find out which
>box is blocking port 80 if indeed port 80 is being blocked f rom command
>line access as root to the IPCop box?

On the IPCop box, run "tcpdump -n -i eth0 port 80". That will tell you if
traffic is arriving at tcp port 80 on eth0 on that box. If it is, run the
same command on eth1. That will tell you if packets are leaving on eth1.
If they're arriving on eth0 but not leaving on eth1, then it's the IPCop
box that's blocking them.

This assumes that you're expecting incoming packets on eth0 and outbound
ones on eth1. Adjust the interface names accordingly if that's not the
case.

Tet
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