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According to this guide I setup two servers.

Now these two servers can't ping each other, this is arp -n result:

# arp -n
Address               HWtype     HWaddress           Flags Mask            Iface
x.x.x.129             ether      xx:xx:xx:xx:xx:xx   C                     br0
x.x.x.21                         (incomplete)                              br0
x.x.x.138                        (incomplete)                              br0

I can't ping x.x.x.21

Note: according to that guide br0 is default interface and there is no MAC Address Defined in it.

So How can I fix it? Thanks

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More information please. Are you running two CentOS VMs on the same host, and having issues with inter-VM communication? –  WinAdmin Aug 18 '12 at 4:49
    
It's two dedicated server on the same datacenter and IP range e.g. 192.168.1.x I configured bridge networking in both servers and now I can ping to them from my PC. but server can't ping each other. Thanks –  Zim3r Aug 18 '12 at 4:53
    
What's the bridge bridging? How are the network interfaces and the network laid out? –  Shane Madden Aug 18 '12 at 7:53
    
Please take a loot at this link: howtoforge.com/… I actually don't know how to answer your question. I thing br0 bridging to eth0. Thanks –  Zim3r Aug 18 '12 at 8:30
    
check the routing table of the 2 servers by ip route show. they should own the same netmask. in most cases, they use 2 different gateways. –  shawnzhu Oct 24 '13 at 1:05
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