Hi All

My objective  is to use fast failover using linux nat in OVS but before
implementing that I am stuck in NAT(ip tables) issue.

I have one ovs bridge with 2 lan interface ( 1 virtual interface
(ethlan)and one physical interface(eth1.4))
Also added 2 wan virtual interfaces to ovs bridge(ethwan1 and ethwan2)

*Below is the bridge configuration:*

LAN SIDE:
ovs-vsctl add-port base ethlan tag=10 -- set interface ethlan type=internal

ovs-vsctl add-port base eth1.4 tag=10  (Actual physical lan interface)


WAN1 SIDE:

ovs-vsctl add-port base ethwan1 tag=20 -- set interface ethwan1
type=internal

WAN2 SIDE:

ovs-vsctl add-port base ethwan2 tag=30 -- set interface ethwan2
type=internal

IP addresss:
ethlan -> 192.168.10.2
ethwan1 -> 192.168.10.4
eth2->10.1.10.2/24
eth3->10.1.20.2/24



I have 2 wan physical interfaces i.e. eth2 and eth3. Both of these
interfaces are lying outside the ovs

My linux nat iptables from ethwan1 to eth2 are not working .I am able to
receive the packet from eth1.4 to ethwan1 but not further.

*I am using below iptables:*

# /sbin/iptables -t nat -A POSTROUTING -o eth2 -j MASQUERADE
# /sbin/iptables -A FORWARD -i eth2 -o ethwan1 -m state  --state
RELATED,ESTABLISHED -j ACCEPT
# /sbin/iptables -A FORWARD -i ethwan1 -o eth2 -j ACCEPT

*I am using below openflows:*

1. ovs-ofctl -O OpenFlow13 add-flow base
cookie=50000,priority=50000,actions=NORMAL


->To forward traffic from ethlan to ethwan1
2.ovs-ofctl -O OpenFlow13 add-flow base
cookie=50001,priority=50001,ip,in_port=1,actions=output:2


Please advise

Thanks
Akshay
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