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xen-users
Re: [Xen-users] Simple networking problem - DNS
I'm using the exact same scenario (CentOS 4.3 with a source compile of
xen 3.0.2-2). Perhaps it is CentOS related (or the way I have compiled it).
You may find that the DNS dies if you don't do any DNS requests for a
few minutes before bringing up your domU. I thought it was when I
brought up the domU but tried just leaving it for a while. It's like DN
resolution works, then xend starts, DN resolution works a bit longer,
then stops working.
Thanks for the reply. I've kept it pretty simple and understand the
networking well enough to be pretty stumped. Good to hear what you find out.
Cheers,
Julius.
Damon Brown wrote:
Thats interesting, I have the same issues ..... right when I brought up
the DomU (which is just a clone of dom0) my DNS wouldnt resolve
anylonger. I was planning on trying to work through it tonight.
Im using CentOS 4.3 with a source compile of xen 3.0.2-2
On 5/22/06, *Julius Spencer* <julius@xxxxxxxxx
<mailto:julius@xxxxxxxxx>> wrote:
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 <http://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 <http://google.com>. (28)
##DNS Request from domU
15:25:51.968703 arp who-has 192.168.1.1 <http://192.168.1.1> tell
192.168.1.231 <http://192.168.1.231>
15:25:51.988626 arp who-has 192.168.1.231 <http://192.168.1.231>
tell 192.168.1.201 <http://192.168.1.201>
15:25:51.988720 arp reply 192.168.1.231 <http://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 <http://192.168.1.201> >
192.168.1.231 <http://192.168.1.231>: icmp 64: host
192.168.1.1 <http://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 <http://192.168.1.201> >
192.168.1.231 <http://192.168.1.231>: icmp 64: host
192.168.1.1 <http://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 <http://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 <http://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 <http://192.168.1.201> Bcast:
192.168.1.255 <http://192.168.1.255> Mask:255.255.255.0
<http://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 <http://127.0.0.1> Mask:255.0.0.0
<http://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
<http://192.168.1.231> Bcast:192.168.1.255
<http://192.168.1.255> Mask: 255.255.255.0 <http://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 <http://127.0.0.1> Mask:255.0.0.0
<http://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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--
Damon Brown
Web Application Developer and Consultant
e-mail: damon@xxxxxxxxxxxxxx <mailto:damon@xxxxxxxxxxxxxx>
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