LinuxQuestions.org - 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!