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[Xen-users] dome domU's can't connect to the internet, while others can

from [Rudi Ahlers] [Permanent Link][Original]
To: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] dome domU's can't connect to the internet, while others can
From: Rudi Ahlers <Rudi@xxxxxxxxxxx>
Date: Fri, 6 Nov 2009 06:23:43 +0200
Delivery-date: Thu, 05 Nov 2009 20:24:54 -0800
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Hi all,

I have a very strange situation, which I can't explain.

On a Core 2Quad server with 8GB RAM, we have 10 xen domU's, as follows:


vps.animalsaregreat.info login: root@zaxen01:[~]$ xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
Domain-0                                   0      512     4 r-----    232.2
actionco.vm                                1      511     1 -b----     21.8
andrew.vm                                  2      255     1 -b----     52.0
animalsa.vm                                3      511     1 -b----     26.5
byracers.vm                                4      511     1 -b----    311.9
eris.vm                                    5      767     1 -b----     52.5
pictures.vm                               13      511     1 -b----     21.8
pluto.vm                                   7     1023     1 -b----    664.2
raftthew.vm                                8      255     1 -b----     16.8
serverza.vm                                9      511     1 -b----    247.2
zafepres.vm                               10      785     1 -b----     17.7




Some of the domU's, can't connect to the internet, even though I can
connect to them on SSH, via the internet. All default gateways are the
same, and there's no firewall setup inbetween. They simply can't ping
anything, or connect to any server, etc.

This is stranger indeed,  all incoming traffic works, but no outgoing traffic.

The older domU's which was setup earlier works fine though. It's just
the 3 latest domU's which is causing a problem.

Here's the dom0's network config:




root@zaxen01:[~]$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:1C:C0:75:19:EE
          inet addr:196.34.x.x  Bcast:196.34.x.x  Mask:255.255.255.224
          inet6 addr: fe80::21c:c0ff:fe75:19ee/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1540 errors:0 dropped:0 overruns:0 frame:0
          TX packets:241 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:260529 (254.4 KiB)  TX bytes:219561 (214.4 KiB)

eth0:1    Link encap:Ethernet  HWaddr 00:1C:C0:75:19:EE
          inet addr:192.168.1.109  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

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:1834 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1834 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:234701 (229.2 KiB)  TX bytes:234701 (229.2 KiB)

peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:186691 errors:0 dropped:0 overruns:0 frame:0
          TX packets:169032 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:54694611 (52.1 MiB)  TX bytes:55789532 (53.2 MiB)
          Memory:e0300000-e0320000

vifacti0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:2009 errors:0 dropped:0 overruns:0 frame:0
          TX packets:35875 errors:0 dropped:758 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:167313 (163.3 KiB)  TX bytes:4796406 (4.5 MiB)

vifandr0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:10887 errors:0 dropped:0 overruns:0 frame:0
          TX packets:42013 errors:0 dropped:818 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:1048147 (1023.5 KiB)  TX bytes:5528771 (5.2 MiB)

vifanim0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:7916 errors:0 dropped:0 overruns:0 frame:0
          TX packets:41134 errors:0 dropped:1064 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:1308001 (1.2 MiB)  TX bytes:5258331 (5.0 MiB)

vifbyra0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:3422 errors:0 dropped:0 overruns:0 frame:0
          TX packets:35426 errors:0 dropped:987 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:254905 (248.9 KiB)  TX bytes:4590111 (4.3 MiB)

viferis0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:8421 errors:0 dropped:0 overruns:0 frame:0
          TX packets:40274 errors:0 dropped:612 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:962275 (939.7 KiB)  TX bytes:5188709 (4.9 MiB)

vifpict0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:857 errors:0 dropped:0 overruns:0 frame:0
          TX packets:961 errors:0 dropped:319 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:71460 (69.7 KiB)  TX bytes:118630 (115.8 KiB)

vifplut0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:51026 errors:0 dropped:0 overruns:0 frame:0
          TX packets:94537 errors:0 dropped:758 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:36379884 (34.6 MiB)  TX bytes:43330662 (41.3 MiB)

vifraft0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:402 errors:0 dropped:0 overruns:0 frame:0
          TX packets:34287 errors:0 dropped:481 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:31854 (31.1 KiB)  TX bytes:4500335 (4.2 MiB)

vifserv0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:45220 errors:0 dropped:0 overruns:0 frame:0
          TX packets:66631 errors:0 dropped:409 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:5955822 (5.6 MiB)  TX bytes:7267415 (6.9 MiB)

vifzafe0  Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:2548 errors:0 dropped:0 overruns:0 frame:0
          TX packets:35400 errors:0 dropped:268 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:249018 (243.1 KiB)  TX bytes:4577275 (4.3 MiB)

vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:5318 errors:0 dropped:0 overruns:0 frame:0
          TX packets:40591 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4904649 (4.6 MiB)  TX bytes:5412306 (5.1 MiB)

xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:27721 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:2947127 (2.8 MiB)  TX bytes:0 (0.0 b)




We have confirmed, the firewall on the network allows full access to,
and from all the IP's on this server so it's not a firewall issue, and
iptables has been disabled (for now) on dom0 as well as the domU's
that doesn't work properly.



-- 
Kind Regards
Rudi Ahlers
CEO, SoftDux Hosting
Web: http://www.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532

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