UDP checksums fail with basic inetd services at high rates
I have to prove the bit error rate of a network and wanted to simply
send a couple of Gigs to the echo port of a remote computer and compare
the /proc/net/snmp values for Udp:InErrors and Tcp:InErrs which, according
to my information, count the incorrect tcp/udp checksums.
Sadly while playing around with iperf and sendip, I saw that the error
numbers are raising with even 1/s when using more than say 100kbit in a
normal switched FastEthernet.
Does inErrors count something different/additional than header checksums?
I would have expected some dropped packages due to congestion but not
I tried inetd and xinetd on 2.4 kernels and even using the echo service of
a cisco router. (the router reported no problems, just my linux host)
: iperf --interval=10 --port=7 --udp --bandwidth=1M --num=1200M -c host
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