Wireshark-users: [Wireshark-users] BAD TCP CHECKSUM in loopback interface
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From: Boschetti Alberto <akenbo@xxxxxx>
Date: Sat, 5 Jan 2008 16:13:02 +0100 (GMT+01:00)
Hi, I'm learning something about C network programming and I've 
downloaded several client/server application.

When I use them on the 
loopback interface (client and server have address 127.x.x.x) and I 
look to the packet with wireshark, I see that the packets have a 
incorrect TCP checksum. When I use the same programs with 2 PC on a 
wired network, wireshark say that the TCP checksum are correct.

I'm 
using the newest version of Wireshark. Is it a bug of Wireshark or a 
problem on my pc?

Thanks
Alberto