L3 mode means there is no L2 header. Both ends need to agree to that.
/neale
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> on behalf of David Gohberg via
lists.fd.io <gohberg=gmail....@lists.fd.io>
Date: Sunday, 6 February 2022 at 15:57
To: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io>
Subject: Re: [vpp-dev] VXLAN overlay routing
Hi,
I'm not interested in bridging so I tried creating the tunnels in L3 mode
and perform routing between VNI 50 and VNI 70 using 2 linux namespaces :
create loopback interface
set interface mac address loop0 02:10:18:34:9f:cd
set interface ip address loop0 11.11.11.3/24
set int l2 bridge loop0 1
set int state loop0 up
create host-interface name eth-t1
create host-interface name eth-t2
set interface ip address host-eth-t1 11.11.10.3/24
set interface state host-eth-t1 up
set interface state host-eth-t2 up
set interface mac address host-eth-t1 02:fe:ef:20:a0:ed
create vxlan tunnel src 11.11.11.3 dst 100.0.0.2 vni 50 l3
create vxlan tunnel src 11.11.11.3 dst 101.0.0.2 vni 70 l3
ip route add 100.0.0.2/32 via 11.11.11.3 loop0
ip route add 101.0.0.2/32 via 11.11.11.3 loop0
Sending this packet from host-eth-t1:
Ether(dst="02:fe:ef:20:a0:ed")/IP(dst="11.11.11.3",src="100.0.0.2")/UDP(sport=1337,dport=4789)/VXLAN(vni=50,flags=8)/Ether()/IP()/UDP()
As a first stage, I'm trying to just have the packet go through vxlan decap and
perform ip4 lookup (which currently should not find a suitable route). However,
after vxlan decap inner ethernet header is treated as IP header:
00:00:43:753410: ip4-udp-lookup
UDP: src-port 1337 dst-port 4789
00:00:43:753414: vxlan4-input
VXLAN decap from vxlan_tunnel0 vni 50 next 2 error 0
00:00:43:753417: ip4-input
unknown 238: 8.0.69.0 -> 0.28.0.1
version 10, header length 40
I'm probably making a simple mistake in my setup.
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