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Old 09-22-2011, 05:53 AM   #1
svandyk
LQ Newbie
 
Registered: Apr 2011
Posts: 4

Rep: Reputation: 0
Question KVM on Redhat 5.7: KVM can ping outside network, outside network can't ping KVM


Hi there

I've set up a RHEL5.7 server [172.16.1.197] and created a RHEL5.7 KVM [172.16.1.200].

Its possible for the KVM [.200] to ping any server on the network:

Code:
[root@172.16.1.200 ~]# ping 172.16.1.123
PING 172.16.1.123 56(84) bytes of data
64 bytes from 172.16.1.123 icmp_seq=1 ttl=64 time=1.01 ms
but whenever i try and ping .200 from any other server [even on the host machine ~ .197] i get the following:

Quote:
[from 172.16.1.197] ping 172.16.1.200
PING 172.16.1.200 (172.16.1.200) 56(84) bytes of data.
From 172.16.1.197 icmp_seq=2 Destination Host Unreachable
From 172.16.1.197 icmp_seq=3 Destination Host Unreachable
i have configured the host and guest as per the following link:

Here

Here is the 'virsh edit <KVMHOSTNAME>
Code:
<interface type='bridge'>
      <mac address= {MAC ADDRESS)/>
      <source bridge='br0'/>
      <model type='virtio'/>
    </interface>
Host server:

Code:
[root@172.16.1.197~]# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.782bcb44012b       no              vnet0
                                                        eth0
virbr0          8000.000000000000       yes
changes in /etc/sysctl.conf

Code:
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0
contents of ifcfg-eth0 [on host]

Code:
[root@172.16.1.197network-scripts]# vi ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
HWADDR={MAC ADDRESS}
ONBOOT=yes
BRIDGE=br0
NM_CONTROLLED=no
contents of ifcfg-br0 [on host]

Code:
DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
HWADDR={MAC ADDRESS}
IPADDR=172.16.1.197
NETMASK=255.255.255.0
GATEWAY=172.16.1.1
ONBOOT=yes
DELAY=0
NM_CONTROLLED=no
EDIT: i have switched off iptables on both host and guest system, still cannot reach the system.

I don't understand why other servers cant see the .200 at this point. any help will be greatly appreciated!

Last edited by svandyk; 09-22-2011 at 06:33 AM.
 
Old 09-23-2011, 06:45 AM   #2
dilbert_uk
Member
 
Registered: Aug 2011
Location: Yorkshire (UK)
Distribution: Lubuntu 10.04, Puppy Wary 5.1.2
Posts: 45

Rep: Reputation: Disabled
From the command line of the .200, can you ping the local host 127.0.0.1?
 
  


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