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[lwip-users] Don't fragment flag


From: Jan Ulvesten
Subject: [lwip-users] Don't fragment flag
Date: Wed, 22 Mar 2006 10:06:03 +0100

check out ip.c:   IPH_OFFSET_SET(iphdr, htons(IP_DF));

 

Can’t be correct, can it ?

 

During a test which I carried out where the underlying network had a TCP MSS (=512) less than my board; I went into trouble due to this flag. I changed it to

IPH_OFFSET_SET(iphdr, 0); and everything worked fine.

 

 

The flag tells the underlying network to don’t fragment the IP packet? Why making such a requirement? 

 

 

Jan Ulvesten

 


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