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SubjectRe: TCPv4 bad checksum in 2.1.131-ac8/9/10
Hi!

On 15 Dec 1998, Paul Flinders wrote:
> Is anyone else seeing bad checksums in recent kernels?
>
> I get a slew of
>
> TCPv4 bad checksum from 194.217.242.34:c1da to 194.222.0.39:0019, len=x/x/x+20
>
> when I pick up my mail (194.217.242.34 is one of my ISP mail machines).
> Oddly I only see it to port 25 on my machine (I've just ftped the ac11
> patches and a few other things with no problems) and I don't seem to have
> lost any data so I'm wondering if it's a hardware problem but I've only
> noticed it in the last 2 days (since I installed ac 8 or 9)

i've been getting alot of them fsking checksum errors over a ppp on
some 33.6K modem, while fetching my mail...it seems that
whenever i start another task (even running a +20 niced task or just
loging in on another VT), i get flooded with this ....
during this time, fetchmail freezes, and i just have to wait a few
seconds until it starts fetching again...it's really bothering. Note that
this kind of errors are usually followed by a few lines like:

last message repeated 7 times
last message repeated 9 times

I'm now using 2.1.131ac9, but i've been getting this since plain old
2.1.131 ( maybe even before...can test and see, if necesarry).
pppd is 2.3 patch level 5. (is this the recommended 2.3.5 ?)
This is what i usually get (193.226.98.6 is my POP3 host...) :

TCPv4 bad checksum from 193.226.98.6:006e to 193.226.98.89:0401, len=1480/1480/1500
TCPv4 bad checksum from 193.226.98.6:006e to 193.226.98.89:0401, len=1480/1480/1500
TCPv4 bad checksum from 193.226.98.6:006e to 193.226.98.89:0401, len=20/20/40
TCPv4 bad checksum from 193.226.98.6:006e to 193.226.98.89:0401, len=1480/1480/1500
TCPv4 bad checksum from 193.226.98.6:006e to 193.226.98.89:0401, len=1480/1480/1500
TCPv4 bad checksum from 193.226.98.6:006e to 193.226.98.89:0401, len=20/20/40
TCPv4 bad checksum from 193.226.98.6:006e to 193.226.98.89:0401, len=1480/1480/1500
TCPv4 bad checksum from 193.226.98.6:006e to 193.226.98.89:0401, len=20/20/40
TCPv4 bad checksum from 193.226.98.6:006e to 193.226.98.89:0401, len=20/20/40
^^^^ ^^^^
the sender's port is always 006e, destination is sometimes 040a, 0411,
0400, 0401, 0407...
i don't know what to make of this...

i'm willing to test patches, if this is a kernel prob.

thanks,
radu


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