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Summary of changes: - Mutiple routing table for each public interface is added (previously there is only one routing table ). when the packet is send out of public interface corresponding per-interface routing table will be used. per-interface routing table will modified when ever ip/interface added/deleted. - New parameter is added to ipassoc command to include the default gateway for every interface/ip. prevously it is using only one public interface to send out, default gateway is obtained at the boot up time. - In the DNAT case. In the revese path(from guest vm to outside, or when DNAT packet receives from the eth0) the public ip/source ip will not be available till POSTROUTING. to overcome this, DNAT connection are marked with routing table number at the time of connection creation, in the reverse path the routing table# from DNAT connection is used to detect per-interface routing table.