[CentOS] Basic KVM networking question

Steve Thompson smt at vgersoft.com
Mon Sep 10 13:37:51 EDT 2012


On Mon, 10 Sep 2012, Dale Dellutri wrote:

> Routing problem?

Not that I can see, but here is the info (omitting interfaces that are not 
up). I included on one KVM since the problem is common to the others, and
they are all set up the same way.

On the host:

3: em2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
     link/ether 84:2b:2b:47:e8:7d brd ff:ff:ff:ff:ff:ff
     inet6 fe80::862b:2bff:fe47:e87d/64 scope link
        valid_lft forever preferred_lft forever
4: p1p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
     link/ether 00:1b:21:6f:2b:4c brd ff:ff:ff:ff:ff:ff
     inet6 fe80::21b:21ff:fe6f:2b4c/64 scope link
        valid_lft forever preferred_lft forever
7: br1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
     link/ether 84:2b:2b:47:e8:7d brd ff:ff:ff:ff:ff:ff
     inet 192.168.4.2/22 brd 192.168.7.255 scope global br1
     inet6 fe80::862b:2bff:fe47:e87d/64 scope link
        valid_lft forever preferred_lft forever
8: br2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
     link/ether 00:1b:21:6f:2b:4c brd ff:ff:ff:ff:ff:ff
     inet 192.168.0.2/22 brd 192.168.3.255 scope global br2
     inet6 fe80::21b:21ff:fe6f:2b4c/64 scope link
        valid_lft forever preferred_lft forever
10: virbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
     link/ether 52:54:00:9d:ad:f7 brd ff:ff:ff:ff:ff:ff
     inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
11: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 500
     link/ether 52:54:00:9d:ad:f7 brd ff:ff:ff:ff:ff:ff
12: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
     link/ether fe:54:00:13:73:28 brd ff:ff:ff:ff:ff:ff
     inet6 fe80::fc54:ff:fe13:7328/64 scope link
        valid_lft forever preferred_lft forever
13: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
     link/ether fe:54:00:12:99:dd brd ff:ff:ff:ff:ff:ff
     inet6 fe80::fc54:ff:fe12:99dd/64 scope link
        valid_lft forever preferred_lft forever
14: vnet2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
     link/ether fe:54:00:72:f5:33 brd ff:ff:ff:ff:ff:ff
     inet6 fe80::fc54:ff:fe72:f533/64 scope link
        valid_lft forever preferred_lft forever

192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1 
192.168.4.0/22 dev br1  proto kernel  scope link  src 192.168.4.2 
192.168.0.0/22 dev br2  proto kernel  scope link  src 192.168.0.2 
default via 192.168.0.1 dev br2

On KVM1:

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
     link/ether 52:54:00:13:73:28 brd ff:ff:ff:ff:ff:ff
     inet 192.168.3.253/22 brd 192.168.3.255 scope global eth0
     inet6 fe80::5054:ff:fe13:7328/64 scope link
        valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
     link/ether 52:54:00:12:99:dd brd ff:ff:ff:ff:ff:ff
     inet 192.168.7.253/22 brd 192.168.7.255 scope global eth1
     inet6 fe80::5054:ff:fe12:99dd/64 scope link
        valid_lft forever preferred_lft forever

192.168.4.0/22 dev eth1  proto kernel  scope link  src 192.168.7.253 
192.168.0.0/22 dev eth0  proto kernel  scope link  src 192.168.3.253 
default via 192.168.0.1 dev eth0

On client A:

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
     link/ether 00:14:22:27:9b:51 brd ff:ff:ff:ff:ff:ff
     inet 192.168.0.172/22 brd 192.168.3.255 scope global eth0
     inet6 fe80::214:22ff:fe27:9b51/64 scope link
        valid_lft forever preferred_lft forever

192.168.0.0/22 dev eth0  proto kernel  scope link  src 192.168.0.172 
default via 192.168.0.2 dev eth0

On client B:

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
     link/ether 00:19:b9:c7:23:ad brd ff:ff:ff:ff:ff:ff
     inet 192.168.5.241/22 brd 192.168.7.255 scope global eth0
     inet6 fe80::219:b9ff:fec7:23ad/64 scope link
        valid_lft forever preferred_lft forever

192.168.4.0/22 dev eth0  proto kernel  scope link  src 192.168.5.241 
default via 192.168.4.1 dev eth0

-Steve



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