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[Xen-users] Strange network problem (Etch)

From: Heikki Levanto <heikki@xxxxxxxxxxxx>

Date: Thu, 4 Oct 2007 13:41:05 +0200

Delivery-date: Thu, 04 Oct 2007 04:41:51 -0700

List-id: Xen user discussion <xen-users.lists.xensource.com>

Hi, I am trying to install xen, and am running into a strange network problem. When I enable the bridge, I my machine looses its network connectivity - except to the local net. I can access the machine from another box on the same net, ping and ssh work fine. But any attempt to contact the machine from the outside, or to contact anything outside that net from the box itself fails miserably. The machine is some sort of HP, located at a co-lo facility. It has two net cards (tg3), each with its own address (once upon a time we had two machines...) # ifconfig eth0 Link encap:Ethernet HWaddr 00:11:0A:2E:DA:C5 inet addr:xx.xxx.xx.136 Bcast:xx.xxx.xx.255 Mask:255.255.255.0 inet6 addr: fe80::211:aff:fe2e:dac5/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:11468 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:832588 (813.0 KiB) TX bytes:492 (492.0 b) Interrupt:17 eth1 Link encap:Ethernet HWaddr 00:11:0A:2E:CA:9B inet addr:xx.xxx.xx.64 Bcast:xx.xxx.xx.255 Mask:255.255.255.0 inet6 addr: fe80::211:aff:fe2e:ca9b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:21802 errors:0 dropped:0 overruns:0 frame:0 TX packets:13124 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2345492 (2.2 MiB) TX bytes:13005551 (12.4 MiB) Interrupt:18 My routing table is simple: # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface xx.xxx.xx.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 xx.xxx.xx.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 0.0.0.0 xx.xxx.xx.1 0.0.0.0 UG 0 0 0 eth1 I have tried to enable the network bridge in /etc/xen/xend-config.sxp (here without all the comments): # cat xend-config.sxp | sed '/^#.*$/d' | sed '/^$/d' (network-script network-bridge) (vif-script vif-bridge) (dom0-min-mem 196) (dom0-cpus 0) When I run /etc/init.d/xend restart I get the new network devices all right: # ifconfig eth0 Link encap:Ethernet HWaddr 00:11:0A:2E:DA:C5 inet addr:xx.xxx.xx.136 Bcast:xx.xxx.xx.255 Mask:255.255.255.0 inet6 addr: fe80::211:aff:fe2e:dac5/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15219 errors:0 dropped:0 overruns:0 frame:0 TX packets:120 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1103031 (1.0 MiB) TX bytes:18022 (17.5 KiB) Interrupt:17 eth1 Link encap:Ethernet HWaddr 00:11:0A:2E:CA:9B inet addr:xx.xxx.xx.64 Bcast:xx.xxx.xx.255 Mask:255.255.255.0 inet6 addr: fe80::211:aff:fe2e:ca9b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:155 errors:0 dropped:0 overruns:0 frame:0 TX packets:206 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:9300 (9.0 KiB) TX bytes:16314 (15.9 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:23283 errors:0 dropped:0 overruns:0 frame:0 TX packets:23283 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:55074193 (52.5 MiB) TX bytes:55074193 (52.5 MiB) peth1 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:221 errors:0 dropped:0 overruns:0 frame:0 TX packets:9 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:17223 (16.8 KiB) TX bytes:654 (654.0 b) Interrupt:18 vif0.1 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:206 errors:0 dropped:0 overruns:0 frame:0 TX packets:155 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:16314 (15.9 KiB) TX bytes:9300 (9.0 KiB) xenbr1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:163 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:7993 (7.8 KiB) TX bytes:0 (0.0 b) My route looks much like it did before: # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface xx.xxx.xx.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 xx.xxx.xx.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 0.0.0.0 xx.xxx.xx.1 0.0.0.0 UG 0 0 0 eth1 As far as I can see, the bridge is there all right: # brctl show bridge name bridge id STP enabled interfaces xenbr1 8000.feffffffffff no vif0.1 peth1 Now I can ping the other machine I have on that net: ping falaffel PING falaffel.xxx.xx (xx.xxx.xx.140) 56(84) bytes of data. 64 bytes from falaffel.xxx.xx (xx.xxx.xx.140): icmp_seq=1 ttl=64 time=3.62 ms 64 bytes from falaffel.xxx.xx (xx.xxx.xx.140): icmp_seq=2 ttl=64 time=0.359 ms 64 bytes from falaffel.xxx.xx (xx.xxx.xx.140): icmp_seq=3 ttl=64 time=0.357 ms 64 bytes from falaffel.xxx.xx (xx.xxx.xx.140): icmp_seq=4 ttl=64 time=0.357 ms --- falaffel.indexdata.dk ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 2999ms rtt min/avg/max/mdev = 0.357/1.173/3.620/1.412 ms But trying to ping a machine on the outside net fails miserably: kafta:~# ping bagel PING bagel.xxx.xx (yyy.yyy.yy.11) 56(84) bytes of data. --- bagel.xxx.xx ping statistics --- 4 packets transmitted, 0 received, 100% packet loss, time 3008ms I tried the trick with # ethtool -K eth0 tx off # ethtool -K eth1 tx off but that does not help anything. Actually, I would like to set things up a bit differently, but first I wanted to get this setup to work, to be sure I understand what is going on. I post another message about the config I really want. But I still need to get this problem solved first! Any and all help would be appreciated. I hope I have provided all necesary information, but if not, just ask, and I will gladly give more. I am under some pressure to get this up and running soon! Regards Heikki Levanto sysadmin, Index Data -- Heikki Levanto heikki at indexdata dot dk "In Murphy We Turst" _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users

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