[lwip-users] PMTU Discovery Using Lwip

[Arul.Shanmugam]

Hi,

I am using lwip stack version 1.3.2

My intension is to perform PMTU discovery using this stack. The below are the steps which I have performed so far.

 

1.       Set the PMTU on windows to 70.

2.       Connect  PC (windows) to a hardware which has an application over Lwip

3.       In Ip.c of lwip, using IPH_OFFSET_SET, i set the DF bit. Eg: IPH_OFFSET_SET(iphdr,htons(ip_df))

4.       After this I send 1000 from hardware to PC.

5.       I expect some error but surprisingly all 1000 bytes of data is received on the PC application.

 

Can some guidance be provided on this?

 

Regards

Arul