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Re: [lwip-users] portscan

From: address@hidden
Subject: Re: [lwip-users] portscan
Date: Wed, 01 Jul 2009 17:11:37 +0200
User-agent: Thunderbird (Macintosh/20090605)

Bernhard 'Gustl' Bauer wrote:
Simon Goldschmidt schrieb:
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

I enabled the stats of my driver (CS8900). What I get during a portscan is a lot of misses and collisions. Could this crash TCP or ping?

I shouldn't crash TCP: if a packet is not received correctly by a remote host, TCP retransmits it eventualy, so your connections should go back to normal after the portscan has finished. During the portscan, however, it could well be that your device is not fast enough to process all the packets sent by the PC, so TCP connections might stall and ping might fail while the portscan is active. That's perfectly normal for a device that cannot handle received packets as fast as they can be sent on the wire (which most embedded devices can't).


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