Hi,
I have spent a fair amount of time trying to solve this problem and
tried things like disabling checksums etc.
The problem is like this:
1. I boot my dom0 without xend running and I can resolve and ping google.
2. I start xend (without and domU domains up) and after a while I can no
longer resolve domain names, but I can ping the public IP addresses.
3. I start up a domU (xm create -c xyz) and I have the same issue there
too (not surprising as it is using the same bridge).
The following is a list of info after step 3 for the dom0 and domU both
of which can ping public IP addresses but not resolve domain names. The
tcpdump is being run on dom0.
Any ideas? It seems like it must be a pretty specific configuration change.
Cheers,
Julius.
##DNS Request from dom0
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96
bytes
15:25:40.336919 IP (tos 0x0, ttl 64, id 33990, offset 0, flags [DF],
proto 17, length: 56) 192.168.1.201.32774 > 192.168.1.1.domain: [udp sum
ok] 46934+ A? google.com. (28)
15:25:40.336966 IP (tos 0x0, ttl 64, id 33990, offset 0, flags [DF],
proto 17, length: 56) 192.168.1.201.32774 > 192.168.1.1.domain: [udp sum
ok] 46934+ A? google.com. (28)
##DNS Request from domU
15:25:51.968703 arp who-has 192.168.1.1 tell 192.168.1.231
15:25:51.988626 arp who-has 192.168.1.231 tell 192.168.1.201
15:25:51.988720 arp reply 192.168.1.231 is-at 00:16:3e:00:00:03
15:25:51.988737 IP (tos 0xc0, ttl 64, id 62783, offset 0, flags [none],
proto 1, length: 84) 192.168.1.201 > 192.168.1.231: icmp 64: host
192.168.1.1 unreachable - admin prohibited for IP (tos 0x0, ttl 64, id
64204, offset 0, flags [DF], proto 17, length: 56) 192.168.1.231.32769 >
192.168.1.1.domain: 16734+[|domain]
15:25:51.988880 IP (tos 0xc0, ttl 64, id 62784, offset 0, flags [none],
proto 1, length: 84) 192.168.1.201 > 192.168.1.231: icmp 64: host
192.168.1.1 unreachable - admin prohibited for IP (tos 0x0, ttl 64, id
64210, offset 0, flags [DF], proto 17, length: 56) 192.168.1.231.32769 >
192.168.1.1.domain: 16734+[|domain]
##NTP Reuqest from dom0
15:25:49.518708 IP (tos 0x10, ttl 64, id 113, offset 0, flags [DF],
proto 17, length: 76) 192.168.1.201.ntp > 194.100.206.70.ntp: [udp sum
ok] NTPv4, length 48
Client, Leap indicator: (0), Stratum 3, poll 7s, precision -20
Root Delay: 0.414093, Root dispersion: 0.031051, Reference-ID:
194.100.206.70
Reference Timestamp: 3357343418.923047999 (2006/05/23 15:23:38)
Originator Timestamp: 3357343418.718721999 (2006/05/23 15:23:38)
Receive Timestamp: 3357343418.923047999 (2006/05/23 15:23:38)
Transmit Timestamp: 3357343549.518689999 (2006/05/23 15:25:49)
Originator - Receive Timestamp: +0.204326000
Originator - Transmit Timestamp: +130.799968000
15:25:49.920925 IP (tos 0x0, ttl 39, id 0, offset 0, flags [DF], proto
17, length: 76) 194.100.206.70.ntp > 192.168.1.201.ntp: [udp sum ok]
NTPv4, length 48
Server, Leap indicator: (0), Stratum 2, poll 7s, precision -16
Root Delay: 0.011306, Root dispersion: 0.019927, Reference-ID:
192.36.144.22
Reference Timestamp: 3357343336.749644999 (2006/05/23 15:22:16)
Originator Timestamp: 3357343549.518689999 (2006/05/23 15:25:49)
Receive Timestamp: 3357343549.716807999 (2006/05/23 15:25:49)
Transmit Timestamp: 3357343549.716845999 (2006/05/23 15:25:49)
Originator - Receive Timestamp: +0.198118000
Originator - Transmit Timestamp: +0.198156000
#####ifconfig dom0
eth0 Link encap:Ethernet HWaddr 00:11:25:A4:6C:4B
inet addr:192.168.1.201 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:425 errors:0 dropped:0 overruns:0 frame:0
TX packets:1327 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:224495 (219.2 KiB) TX bytes:126651 (123.6 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:963 errors:0 dropped:0 overruns:0 frame:0
TX packets:963 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:98272 (95.9 KiB) TX bytes:98272 (95.9 KiB)
peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:1029 errors:0 dropped:0 overruns:0 frame:0
TX packets:403 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:431691 (421.5 KiB) TX bytes:47343 (46.2 KiB)
Interrupt:16
vif0.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1327 errors:0 dropped:0 overruns:0 frame:0
TX packets:425 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:126651 (123.6 KiB) TX bytes:224495 (219.2 KiB)
vif1.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:74 errors:0 dropped:0 overruns:0 frame:0
TX packets:84 errors:0 dropped:22 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4764 (4.6 KiB) TX bytes:6566 (6.4 KiB)
xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:668 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:195790 (191.2 KiB) TX bytes:0 (0.0 b)
###ifconfig domU
eth0 Link encap:Ethernet HWaddr 00:16:3E:00:00:03
inet addr:192.168.1.231 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::216:3eff:fe00:3/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:84 errors:0 dropped:0 overruns:0 frame:0
TX packets:74 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6566 (6.4 KiB) TX bytes:4764 (4.6 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:560 (560.0 b) TX bytes:560 (560.0 b)
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