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After this code changes added Router-GW MAC address in table 46 (Outbound NAPT Table) when the SNAT traffic is going out to external network. Please find the below table 46 pipeline flow for the reference.
Outbound Traffic (table=46)
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stack@Openstack-Controller:~$ sudo ovs-ofctl dump-flows -O Openflow13 br-int | grep table=46
cookie=0x8122170, duration=257.666s, table=46, n_packets=7, n_bytes=518, idle_timeout=300, send_flow_rem priority=10,tcp,metadata=0x222e0/0xfffffffe,nw_src=10.0.0.5,tp_src=52446 actions=set_field:172.160.0.3->ip_src,set_field:49152->tcp_src,set_field:fa:16:3e:11:4a:cc->eth_src,write_metadata:0x222ee/0xfffffffe,goto_table:47
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