UDP Checksum errors on nat-pmp packets

davidc · Post by **davidc** » Fri Feb 13, 2009 10:38 am

Hi, I'm using 1.50b6 (7885) and I'm having trouble with port forwarding and NAT-PMP. I checked my router (OpenWRT running miniupnpd) and it is reporting UDP checksum errors from my mac:

Code: Select all

Feb 13 02:19:28 death-router user.debug kernel: UDP: bad checksum. From 10.0.0.116:63488 to 10.0.0.254:5351 ulen 20

(I get a bunch that say the exact same thing (except for the timestamp, obviously)).

So I did tcpdump -w and checked the output in wireshark and it too is reporting UDP checksum errors. Consequently my port is not being forwarded correctly. Is this a Transmission issue? Isn't the OS network stack responsible for the UDP checksums? I mean, unless you are using SOCKET_RAW...

-David