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
--
*** E-Mail is NOT a SECURE channel ***
James B. Byrne mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3
James B. Byrne
2012-Oct-12 13:16 UTC
[CentOS-virt] Cannot get kvm guests to connect to network
This cross-posted from the main Centos discussion list.
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 instance and this too does not connect
with either the kvm host or the gateway.
I have shutdown all the guests, restarted networking on the host and
restarted the gueests and the problem persists on the two most
recently added guests but does not happen on the first guest instance.
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
--
*** E-Mail is NOT a SECURE channel ***
James B. Byrne mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3