Add new subnets to KVM Host

Bashed · 02-05-2016, 10:25 AM

I need to assign a handful of /27 subnets to my KVM host node (Centos 6). I routed them correctly at the Cisco switch, so that's all go.

Traceroute & ping works fine on gateway on each subnet, but not on the public IPs.

I tried this method, didn't work.
http://www.ducea.com/2006/07/15/linu...based-systems/

I created ifcfg-eth0-range1, added below and restarted network. Still can't ping public IPs.

Code:

IPADDR_START=xx.xx.98.66  
IPADDR_END=xx.xx.98.90    
CLONENUM_START=0

The /27 subnets are already assigned to the Ubuntu KVM VM itself.

Even MTR doesn't work

Code:

$ mtr --no-dns -rw xx.xx.42.188
Start: Fri Feb 5 16:42:14 2016
HOST: castle Loss% Snt Last Avg Best Wrst StDev
1.|-- 192.168.88.1 0.0% 10 0.9 1.3 0.9 2.5 0.3
2.|-- 94.246.207.117 0.0% 10 2.5 2.1 1.5 3.0 0.3
3.|-- 89.221.64.2 0.0% 10 1.5 4.3 1.5 11.8 3.3
4.|-- 81.20.144.98 0.0% 10 1.6 3.1 1.4 12.2 3.2
5.|-- 81.20.144.98 0.0% 10 2.8 4.7 1.5 24.9 7.1
6.|-- 217.159.159.122 0.0% 10 3.5 11.3 2.1 34.6 12.3
7.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
8.|-- 194.126.123.2 0.0% 10 4.6 3.8 1.9 8.7 2.1
9.|-- 62.115.34.133 0.0% 10 3.0 4.5 1.8 18.9 5.1
10.|-- 62.115.134.220 0.0% 10 12.4 13.2 12.4 14.6 0.5
11.|-- 62.115.141.201 0.0% 10 12.8 14.9 12.4 20.7 3.2
12.|-- 4.68.110.225 90.0% 10 18.2 18.2 18.2 18.2 0.0
13.|-- 4.69.156.5 0.0% 10 122.5 121.1 119.8 122.5 0.8
14.|-- 4.69.156.5 0.0% 10 120.4 120.5 119.8 122.3 0.6
15.|-- 4.28.184.174 0.0% 10 124.7 124.8 123.5 128.7 1.4
16.|-- xx.xx.19.52 50.0% 10 145.1 130.3 124.4 145.1 8.8 (core router)
17.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0

Bashed · 02-05-2016, 03:25 PM

Code:

[root@kvm1 network-scripts]# ip addr show br1
30: br1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
    link/ether 26:7e:4a:b2:9a:e3 brd ff:ff:ff:ff:ff:ff
    inet xx.xx.98.66/27 brd xx.xx.98.95 scope global br1
    inet6 fe80::247e:4aff:feb2:9ae3/64 scope link 
       valid_lft forever preferred_lft forever

[root@kvm1 network-scripts]# ip addr show br0
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
    link/ether 00:25:90:a1:76:06 brd ff:ff:ff:ff:ff:ff
    inet xx.xx.200.2/24 brd xx.xx.200.255 scope global br0
    inet6 fe80::fc16:3cff:fe9d:705b/64 scope link 
       valid_lft forever preferred_lft forever
[root@kvm1 network-scripts]# ip route
xx.xx.98.64/27 dev br1  proto kernel  scope link  src xx.xx.98.66 
10.0.0.0/24 dev eth1  proto kernel  scope link  src 10.0.0.9 
xx.xx.200.0/24 dev br0  proto kernel  scope link  src xx.xx.200.2 
169.254.0.0/16 dev eth1  scope link  metric 1003 
169.254.0.0/16 dev br0  scope link  metric 1004 
169.254.0.0/16 dev br1  scope link  metric 1030 
default via xx.xx.200.1 dev br0 

[root@kvm1 network-scripts]# service network restart
Shutting down interface br0:                               [  OK  ]
Shutting down interface eth0:                              [  OK  ]
Shutting down interface eth1:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface br1:  Determining if ip address xx.xx.98.66 is already in use for device br0...
Error, some other host already uses address xx.xx.98.66.
                                                           [FAILED]
Bringing up interface eth0:                                [  OK  ]
Bringing up interface eth1:  Determining if ip address 10.0.0.9 is already in use for device eth1...
                                                           [  OK  ]
Bringing up interface br0:  Determining if ip address xx.xx.200.2 is already in use for device br0...
                                                           [  OK  ]