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

[address@hidden]

Bernhard 'Gustl' Bauer wrote:
> Hi,
>
> 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.

Simon