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Re: [lwip-users] ping with packet size greater than MSS

From: address@hidden
Subject: Re: [lwip-users] ping with packet size greater than MSS
Date: Mon, 20 Jul 2009 17:53:23 +0200
User-agent: Thunderbird (Macintosh/20090605)

Bernhard 'Gustl' Bauer wrote:

how does LWIP treat these pings?

Incoming or outgoing? For incoming, IP_REASSEMBLY must be set to 1. For outgoing, IP_FRAG must be set to 1. If so, the pings should be handled correctly. If not, some error counter in LWIP_STATS should be increased.

What Kieran remembered was a problem where the incoming ping packet did not have enough memory to be re-used as an outgoing packet (which is the default implementation of ping). However, since LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN defaults to 1 and is not exposed in opt.h, there should be no need to change it.


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