On 06/26/2014 12:36 PM, CLOSE Dave issued this missive:
Rick Stevens wrote:
Quite odd. Seems to work on my machine. In one window, I did a
nc -lu 29531
and in another:
echo 'Hello there!' | nc -u localhost 29531
and the first window saw the message. Try the same and see if it
works.
Yes, that works for me. Further, this works when run from a different
machine on the same network:
echo "UDP broadcast" \
| socat - UDP4-DATAGRAM:255.255.255.255:29531,so-broadcast
Examining the packets as they are captured by tcpdump, both the ones NC
sees and the ones it doesn't, I don't find anything unusual. No checksum
or length errors, for example. And comparing them to the one generated
by socat doesn't reveal any obvious significant difference, either.
Uhm, gee. Since another host on the same network gets through, the one
sending packets that NC doesn't get must have something set in the TCP
stack that nc doesn't like. I'd check the flags on the packets that nc
doesn't see. It might be really subtle.
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