We have several JS21, all with two ethernet interfaces, both interfaces
in use. For example this is what things look like when we boot one
such blade with the latest xen and linux for xen and before starting xend.
cso89:~ # ifconfig
ifconfig
eth0 Link encap:Ethernet HWaddr 00:11:25:C9:4D:5A
inet addr:192.168.4.9 Bcast:192.168.255.255 Mask:255.255.0.0
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
RX packets:15436 errors:0 dropped:0 overruns:0 frame:0
TX packets:679 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1084295 (1.0 Mb) TX bytes:62108 (60.6 Kb)
Interrupt:17
eth1 Link encap:Ethernet HWaddr 00:11:25:C9:4D:5B
inet addr:9.2.78.89 Bcast:9.2.78.255 Mask:255.255.255.0
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14899 errors:0 dropped:0 overruns:0 frame:0
TX packets:1514 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1076900 (1.0 Mb) TX bytes:171946 (167.9 Kb)
Interrupt:18
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:22 errors:0 dropped:0 overruns:0 frame:0
TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1480 (1.4 Kb) TX bytes:1480 (1.4 Kb)
This is what the routing tables look like.
cso89:~ # netstat -rn
netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
9.2.78.0 0.0.0.0 255.255.255.0 U 0 0 0
eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
192.168.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 9.2.78.1 0.0.0.0 UG 0 0 0
eth1
Notice that the machine name, cso89 corresponds to ip address 9.2.78.89
and is on eth1. Notice also that there is a default route from the
machine, the last one, in the table above. After we start xend this is
the network interface table.
cso89:~ # ifconfig
ifconfig
eth0 Link encap:Ethernet HWaddr 00:11:25:C9:4D:5A
inet addr:192.168.4.9 Bcast:192.168.255.255 Mask:255.255.0.0
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
RX packets:18 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1333 (1.3 Kb) TX bytes:650 (650.0 b)
eth1 Link encap:Ethernet HWaddr 00:11:25:C9:4D:5B
inet addr:9.2.78.89 Bcast:9.2.78.255 Mask:255.255.255.0
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
RX packets:15102 errors:0 dropped:0 overruns:0 frame:0
TX packets:1605 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1090820 (1.0 Mb) TX bytes:190036 (185.5 Kb)
Interrupt:18
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:22 errors:0 dropped:0 overruns:0 frame:0
TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1480 (1.4 Kb) TX bytes:1480 (1.4 Kb)
peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:19 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1541 (1.5 Kb) TX bytes:748 (748.0 b)
Interrupt:17
vif0.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:2 errors:0 dropped:0 overruns:0 frame:0
TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:650 (650.0 b) TX bytes:1333 (1.3 Kb)
xenbr1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:19 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:1348 (1.3 Kb) TX bytes:0 (0.0 b)
This is as expected. However notice what happened to our routing tables.
cso89:~ # netstat -rn
netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
9.2.78.1 0.0.0.0 255.255.255.255 UH 0 0 0
eth0
9.2.78.0 0.0.0.0 255.255.255.0 U 0 0 0
eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
192.168.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 9.2.78.1 0.0.0.0 UG 0 0 0
eth0
0.0.0.0 9.2.78.1 0.0.0.0 UG 0 0 0
eth1
The next to last route is bogus and interferes with the proper operation
of the machine as far as the network goes. I am not sure what the
first route in the list above is all about, but seems strange as well.
In any case it was not there before.
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