Hello,
According to the doc, tun0: An OVS internal port (port 2 on br0)   is used for 
external network access via NAT.
This is verified by the iptable  SNAT MASQUERADE rule.
In our network, we uses route no NAT.  This is achieved by remove the   NAT 
rule and everything work fine.
But unfortunately, it works only a few seconds sine openshift sdn will add the 
sNAT rule back soon.
Is there a way to change the tun0 SNAT to take effect on  some subnet, other 
subnet will route default.
Your suggestion is appreciated!
Dai Yaofei





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