ustcweizhou commented on issue #2514: Problem with NAT configuration and VMs not accessing each other via public IPs URL: https://github.com/apache/cloudstack/pull/2514#issuecomment-376835719 @rafaelweingartner We faced the same issue before. it is fixed by adding some rules in ip route tables. ``` $ ip route show table Table_eth1 throw 10.10.1.0/24 proto static throw 10.10.2.0/24 proto static ``` eth1 is public interface 10.10.1.0/24 and 10.10.2.0/24 are cidr of vpc tiers. The idea came from the code before 4.7 (systemvm refactoring) https://github.com/apache/cloudstack/blob/4.5/systemvm/patches/debian/config/opt/cloud/bin/ipassoc.sh copy_routes_from_main in line 122
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