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RH does have firewall rules you may want to see if DNS is going out. I know you said that it goes outside but you can also check the order if in nsswitch.conf  etc.. 

Have a good day, 

ciao 
-- 
Remo Mattei


November 12, 2013 at 14:32:52, Xin Zhao (xzhao at bnl.gov) ha scritto:

Hello,  

I have a multi-host grizzly RHEL6 install, using OVS. From the instance,  
I can ping external ips, but DNS resolv doesn't work, it only works for  
other instances on the VM network.  
If I do subnet-update to add public DNS server ips to the vm network,  
DNS resolv works for external hosts, but stops working for other  
instances on the same VM network.  
Do I miss some configuration here?  

Thanks,  
Xin  

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