[CentOS] Cannot get kvm guests to connect to network

James B. Byrne byrnejb at harte-lyne.ca
Thu Oct 11 17:12:02 EDT 2012


I installed a new CentOS-6.3 kvm guest on a recently provisioned kvm
host also running CentOS-6.3.  This guest will not connect to the
network and the host cannot connect to it via its public IP address. I
had previously installed a guest system on thst same kvm host using
the same ISO and that system connects to the network without problem.

I next created a third guest isntance and this too does not connect
with either the kvm host or the gateway.  I have installed litterally
dozens of kvm guests this past year and I have never encountered this
situation.  Has anyone else?  Does anyone have any idea what might be
going on?

ip addr
1: lo <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP qlen 1000
    link/ether 52:54:00:a0:26:47 brd ff:ff:ff:ff:ff:ff
    inet 216.185.71.243/24 brd 216.185.71.255 scope global eth0
    inet6 fe80::5054:ff:fea0:2647/64 scope link
       vaslid_lft forever preferred_lft forever

ip route
216.185.71.0/24 dev eth0  proto kernel  scope link  scr 216.185.71.243
169.254.0.0/16 dev eth0  scope link  metric 1002
default via 216.185.71.1 dev eth0

netstat -r
Kernel IP routing table
Destination    Gateway      Genmask        Flags  MSS Window  irtt Iface
216.185.71.0   *            255.255.255.0  U        0 0          0 eth0
link-local     *            255.255.0.0    U        0 0          0 eth0
default        216.185.71.1 0.0.0.0        UG       0 0          0 eth0

service iptables stop
.  .  .

ping 216.185.71.1
PING 216.185.71.1 (216.185.71.1) 56(84) bytes of data.
>From 216.185.71.243 icmp_seq=2 Destination Host Unreachable
>From 216.185.71.243 icmp_seq=3 Destination Host Unreachable
>From 216.185.71.243 icmp_seq=4 Destination Host Unreachable
^C



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James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
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Hamilton, Ontario             fax: +1 905 561 0757
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