Re: [lwip-users] ping thread fails to works when IP, UDP, TCP and ICMP checksums by hardware

[vincent cui]

Hi ,

 

I found a strange case about ping. All test is base on removeing the iecho->chksum = inet_chksum(iecho, len); And using HW checksum

If I set ping_target with IPV4_ADDR(&ping_target, 192, 168, 1, 1), then send it out, the received icmp packet is from 192.168.1.1. host

If I set ping_target with ipaddr_aton(“192.168.1.1”, &ping_target), then send it out, the received icmp packet is not from 192.168.1.1 host.

 

I check the ping_target.addr value in the two case, they are same, but received icmp result is different !

 

Also, I add “printf(“%x \n”, ping_target.addr)” code after IPV4_ADDR(&ping_target, 192, 168, 1, 1), the received icmp packet is not from 192.168.1.1 host too .

 

Anyone meet the problem ?

 

Vincent  

 

From: lwip-users-bounces+address@hidden [mailto:lwip-users-bounces+address@hidden On Behalf Of Funk, Artur
Sent: 2012年6月6日 19:49
To: Mailing list for lwIP users
Subject: Re: [lwip-users] ping thread fails to works when IP, UDP, TCP and ICMP checksums by hardware

 

An idea: comment this line in ping_prepare_echo function:

iecho->chksum = inet_chksum(iecho, len);

 

Von: lwip-users-bounces+address@hidden [mailto:lwip-users-bounces+address@hidden Im Auftrag von vincent cui
Gesendet: Mittwoch, 6. Juni 2012 13:12
An: Mailing list for lwIP users
Betreff: [lwip-users] ping thread fails to works when IP, UDP, TCP and ICMP checksums by hardware

 

All

I ported ping thread from contrib. packet, and found that it fails to works when IP, UDP, TCP and ICMP checksums by HW.

But it works when those checksums by SW.

 

Anyone meets same problem ?

 

Regards,

Vincent