Since 2.1.127 or thereabouts, I've noticed lots of "TCPv4 bad checksum"
errors in my kernel logs. This is over a PPP connection.
I know that there are supposed to be bugs with some ISPs VJ header
compression, so I disabled it at the Linux end with "novj".
Unfortunately, there are still checksums errors with VJ header
compression disabled. :-(
It's possible that these errors were occurring with some earlier kernels
and I wasn't seeing them. However when they occur, the responsiveness
of the connection is affected noticably, and I didn't notice this with
some older kernels.
These errors come in bursts, lasting a few minutes. Traffic does
continue to get through, but things like FTP downloads tend to stall for
a few tens of seconds while this is happening.
The errors sometimes take a couple of hours to appear, but they do
always appear. My logs for the last week are full of them.
I logged some of the received PPP frames, in case that information is
useful.
Any thoughts?
-- Jamie
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