Displaying 1 result from an estimated 1 matches for "nnpvvi".
2011 Apr 27
0
Problems with bad UDP checksums
...domU with 2.6.38 kernel.
Easiest way to reproduce seems to be with DNS (tried hping3 -2 ... but it DID send correct
udp checksums even with tx-checksumming turned on).
Sniffing on a server (not necessarily running a DNS server, but pointed to in the other
domU''s resolv.conf):
# tcpdump -nnpvvi eth0 port 53
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
10:41:48.733499 IP (tos 0x0, ttl 64, id 1644, offset 0, flags [DF], proto UDP (17), length 59)
192.168.20.16.38961 > 192.168.20.96.53: [bad udp cksum 66ce!] 43518+ A?
aoeu.example.com. (31)
Then a...