Hello, I'm following [0] to set up a userspace vxlan tunnel between two hosts and it works as expected. But, one of the requirements I have is not to have any IP assigned to physical bridge (br-phy) but use the flows to pick up the source IP. I've configured the bridges as shown in [1] and added the flow rule as shown in [2].
VM is attached to br-int and has an IP 10.10.10.10 assigned to it. My expectation is when the packet comes to br-int through br-int internal interface, the packet is encapsulated using the flow keys and use the local_ip or tun_src as the source IP but when we try to output the packet to native tunnel, the source IP lookup fails and the packet is dropped as shown in [3]. Is there a way to make this work without assigning ip to br-phy? Can the routing after vxlan pick up the source IP from the configured rule and not depend on the system configured IP? *[0]* https://docs.openvswitch.org/en/latest/howto/userspace-tunneling/ *[1]* sudo ovs-vsctl show bf7d9abd-7275-4a22-9f80-7733bda04cc2 Bridge br-phy datapath_type: netdev Port br-phy Interface br-phy type: internal Port eth1 Interface eth1 Bridge br-int datapath_type: netdev Port br-int Interface br-int type: internal Port vxlan Interface vxlan type: vxlan options: {key=flow, local_ip="192.168.1.10", remote_ip=flow} *[2]* ovs-ofctl add-flow br-int \ 'in_port=br-int actions=set_tunnel:5001,set_field:192.168.1.20->tun_dst,set_field:192.168.1.10->tun_src,output:vxlan' *[3]* ovs-appctl ofproto/trace br-int in_port=br-int Flow: in_port=LOCAL,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,dl_type=0x0000 bridge("br-int") ---------------- 0. in_port=LOCAL, priority 32768 set_tunnel:0x1389 load:0xc0a80114->NXM_NX_TUN_IPV4_DST[] load:0xc0a8010a->NXM_NX_TUN_IPV4_SRC[] output:3 -> output to native tunnel * >> native tunnel routing failed* Final flow: tun_src=192.168.1.10,tun_dst=192.168.1.20,tun_ipv6_src=::,tun_ipv6_dst=::,tun_gbp_id=0,tun_gbp_flags=0,tun_tos=0,tun_ttl=0,tun_erspan_ver=0,gtpu_flags=0,gtpu_msgtype=0,tun_flags=0,in_port=LOCAL,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,dl_type=0x0000 Megaflow: recirc_id=0,eth,in_port=LOCAL,dl_type=0x0000 *Datapath actions: drop* -Krishna
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