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Re: [lwip-users] portscan

From: Simon Goldschmidt
Subject: Re: [lwip-users] portscan
Date: Tue, 30 Jun 2009 16:28:22 +0200

> At the moment there is only port 80 active. So what about scans to other 
> ports? Are they left half open or immediately disposed of? I think it 
> is the later, because after a portscan MEM TCP_PCB max is only 1!

Packets for other ports are rejected right away (you should see a RST being 
sent in a packet sniffer). If max is 1, that suggests your problem lies 
somewhere else. Attaching a debugger to the device and checking why packets 
don't come through will be the best you can do.

In the past, stalls like this have often been driver bugs: a portscan is like a 
stress situation to your driver, maybe it leaves interrupts disabled or 
something like that, so the device cannot receive any packets?

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