Description of problem: With stateful DHCPv6 IA_NA address allocation, host allocated addresses might have an /128 prefix and no subnet information in them. These hosts acquire routing information through RA, including on-link subnet routes. OVN-Kubernetes replicates host networking with OVN logical routers and configures one of its ports with the host address but cannot add the host on-link routes as currently static routes require a nexthop in OVN. This forces OVN-Kubernetes to route on-link traffic through a gateway. An alternative or additional welcomed enhancement would be to support incoming RA.
(In reply to Jaime Caamaño Ruiz from comment #0) > OVN-Kubernetes replicates host networking with OVN logical routers and > configures one of its ports with the host address but cannot add the host > on-link routes as currently static routes require a nexthop in OVN. This > forces OVN-Kubernetes to route on-link traffic through a gateway. To clarify, this would be the equivalent of "ip route add 192.168.34.0/24 dev eth0", right? Thanks!
That's right.
upstream series: http://patchwork.ozlabs.org/project/ovn/list/?series=257019
tested with following script: systemctl start openvswitch systemctl start ovn-northd ovn-nbctl set-connection ptcp:6641 ovn-sbctl set-connection ptcp:6642 ovs-vsctl set open . external_ids:system-id=hv1 external_ids:ovn-remote=tcp:1.1.40.25:6642 external_ids:ovn-encap-type=geneve external_ids:ovn-encap-ip=1.1.40.25 systemctl restart ovn-controller ovn-nbctl ls-add ls1 ovn-nbctl lsp-add ls1 ls1p1 ovn-nbctl lsp-set-addresses ls1p1 "00:00:00:01:01:01 192.168.1.1 2001::1" ovn-nbctl lsp-add ls1 ls1p2 ovn-nbctl lsp-set-addresses ls1p2 "00:00:00:01:01:02 192.168.1.2 2001::2" ovn-nbctl lr-add lr1 ovn-nbctl lrp-add lr1 lr1-ls1 00:00:00:00:00:01 192.168.1.254/32 2001::a/128 ovn-nbctl lsp-add ls1 ls1-lr1 ovn-nbctl lsp-set-addresses ls1-lr1 "00:00:00:00:00:01 192.168.1.254 2001::a" ovn-nbctl lsp-set-type ls1-lr1 router ovn-nbctl lsp-set-options ls1-lr1 router-port=lr1-ls1 ovn-nbctl --may-exist lr-route-add lr1 192.168.1.0/24 lr1-ls1 ovn-nbctl --may-exist lr-route-add lr1 192.168.1.0/24 lr1-ls1 ovn-nbctl --may-exist lr-route-add lr1 2001::/64 lr1-ls1 ovn-nbctl --may-exist lr-route-add lr1 2001::/64 lr1-ls1 ovn-nbctl lrp-add lr1 lr1-ls2 00:00:00:00:00:02 192.168.2.254/32 2002::a/128 ovn-nbctl ls-add ls2 ovn-nbctl lsp-add ls2 ls2-lr1 ovn-nbctl lsp-set-addresses ls2-lr1 "00:00:00:00:00:02 192.168.2.254 2002::a" ovn-nbctl lsp-set-type ls2-lr1 router ovn-nbctl lsp-set-options ls2-lr1 router-port=lr1-ls2 ovn-nbctl --may-exist lr-route-add lr1 192.168.2.0/24 lr1-ls2 ovn-nbctl --may-exist lr-route-add lr1 192.168.2.0/24 lr1-ls2 ovn-nbctl --may-exist lr-route-add lr1 2002::/64 lr1-ls2 ovn-nbctl --may-exist lr-route-add lr1 2002::/64 lr1-ls2 ovn-nbctl lsp-add ls2 ls2p1 ovn-nbctl lsp-set-addresses ls2p1 "00:00:00:01:02:01 192.168.2.1 2002::1" ovn-nbctl lsp-add ls2 ls2p2 ovn-nbctl lsp-set-addresses ls2p2 "00:00:00:01:02:02 192.168.2.2 2002::2" ovs-vsctl add-port br-int ls1p1 -- set interface ls1p1 type=internal external_ids:iface-id=ls1p1 ovs-vsctl add-port br-int ls2p1 -- set interface ls2p1 type=internal external_ids:iface-id=ls2p1 ip netns add ls1p1 ip link set ls1p1 netns ls1p1 ip netns exec ls1p1 ip link set ls1p1 address 00:00:00:01:01:01 ip netns exec ls1p1 ip link set ls1p1 up ip netns exec ls1p1 ip addr add 192.168.1.1/24 dev ls1p1 ip netns exec ls1p1 ip addr add 2001::1/64 dev ls1p1 ip netns exec ls1p1 ip route add default via 192.168.1.254 dev ls1p1 ip netns exec ls1p1 ip -6 route add default via 2001::a dev ls1p1 ip netns add ls2p1 ip link set ls2p1 netns ls2p1 ip netns exec ls2p1 ip link set ls2p1 address 00:00:00:01:02:01 ip netns exec ls2p1 ip link set ls2p1 up ip netns exec ls2p1 ip addr add 192.168.2.1/24 dev ls2p1 ip netns exec ls2p1 ip addr add 2002::1/64 dev ls2p1 ip netns exec ls2p1 ip route add default via 192.168.2.254 dev ls2p1 ip netns exec ls2p1 ip -6 route add default via 2002::a dev ls2p1 sleep 3 ip netns exec ls1p1 ping 192.168.2.1 -c 1 ip netns exec ls1p1 ping6 2002::1 -c 1 Verified on ovn-2021-21.06.0-29.e8: [root@wsfd-advnetlab16 bz1982551]# rpm -qa | grep -E "openvswitch2.15|ovn-2021" ovn-2021-21.06.0-29.el8fdp.x86_64 python3-openvswitch2.15-2.15.0-38.el8fdp.x86_64 ovn-2021-central-21.06.0-29.el8fdp.x86_64 openvswitch2.15-2.15.0-38.el8fdp.x86_64 ovn-2021-host-21.06.0-29.el8fdp.x86_64 + ovn-nbctl --may-exist lr-route-add lr1 192.168.1.0/24 lr1-ls1 + ovn-nbctl --may-exist lr-route-add lr1 192.168.1.0/24 lr1-ls1 + ovn-nbctl --may-exist lr-route-add lr1 2001::/64 lr1-ls1 + ovn-nbctl --may-exist lr-route-add lr1 2001::/64 lr1-ls1 + ovn-nbctl lrp-add lr1 lr1-ls2 00:00:00:00:00:02 192.168.2.254/32 2002::a/128 + ovn-nbctl ls-add ls2 + ovn-nbctl lsp-add ls2 ls2-lr1 + ovn-nbctl lsp-set-addresses ls2-lr1 '00:00:00:00:00:02 192.168.2.254 2002::a' + ovn-nbctl lsp-set-type ls2-lr1 router + ovn-nbctl lsp-set-options ls2-lr1 router-port=lr1-ls2 + ovn-nbctl --may-exist lr-route-add lr1 192.168.2.0/24 lr1-ls2 + ovn-nbctl --may-exist lr-route-add lr1 192.168.2.0/24 lr1-ls2 + ovn-nbctl --may-exist lr-route-add lr1 2002::/64 lr1-ls2 + ovn-nbctl --may-exist lr-route-add lr1 2002::/64 lr1-ls2 + ovn-nbctl lsp-add ls2 ls2p1 + ovn-nbctl lsp-set-addresses ls2p1 '00:00:00:01:02:01 192.168.2.1 2002::1' + ovn-nbctl lsp-add ls2 ls2p2 + ovn-nbctl lsp-set-addresses ls2p2 '00:00:00:01:02:02 192.168.2.2 2002::2' + ovs-vsctl add-port br-int ls1p1 -- set interface ls1p1 type=internal external_ids:iface-id=ls1p1 + ovs-vsctl add-port br-int ls2p1 -- set interface ls2p1 type=internal external_ids:iface-id=ls2p1 + ip netns add ls1p1 + ip link set ls1p1 netns ls1p1 + ip netns exec ls1p1 ip link set ls1p1 address 00:00:00:01:01:01 + ip netns exec ls1p1 ip link set ls1p1 up + ip netns exec ls1p1 ip addr add 192.168.1.1/24 dev ls1p1 + ip netns exec ls1p1 ip addr add 2001::1/64 dev ls1p1 + ip netns exec ls1p1 ip route add default via 192.168.1.254 dev ls1p1 + ip netns exec ls1p1 ip -6 route add default via 2001::a dev ls1p1 + ip netns add ls2p1 + ip link set ls2p1 netns ls2p1 + ip netns exec ls2p1 ip link set ls2p1 address 00:00:00:01:02:01 + ip netns exec ls2p1 ip link set ls2p1 up + ip netns exec ls2p1 ip addr add 192.168.2.1/24 dev ls2p1 + ip netns exec ls2p1 ip addr add 2002::1/64 dev ls2p1 + ip netns exec ls2p1 ip route add default via 192.168.2.254 dev ls2p1 + ip netns exec ls2p1 ip -6 route add default via 2002::a dev ls2p1 + sleep 3 + ip netns exec ls1p1 ping 192.168.2.1 -c 1 PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data. 64 bytes from 192.168.2.1: icmp_seq=1 ttl=63 time=5.02 ms --- 192.168.2.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 5.016/5.016/5.016/0.000 ms + ip netns exec ls1p1 ping6 2002::1 -c 1 PING 2002::1(2002::1) 56 data bytes 64 bytes from 2002::1: icmp_seq=1 ttl=63 time=6.64 ms --- 2002::1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 6.644/6.644/6.644/0.000 ms
but there is warn in ovn-northd.log: [root@wsfd-advnetlab16 ~]# grep WARN /var/log/ovn/ovn-northd.log 2021-09-18T06:01:37.909Z|00008|ovn_northd|WARN|bad ipv6 address
also verified on ovn2.13-20.12.0-178.el8: + ip netns exec ls1p1 ping 192.168.2.1 -c 1 PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data. 64 bytes from 192.168.2.1: icmp_seq=1 ttl=63 time=6.26 ms --- 192.168.2.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 6.262/6.262/6.262/0.000 ms + ip netns exec ls1p1 ping6 2002::1 -c 1 PING 2002::1(2002::1) 56 data bytes 64 bytes from 2002::1: icmp_seq=1 ttl=63 time=7.48 ms --- 2002::1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 7.480/7.480/7.480/0.000 ms [root@wsfd-advnetlab16 bz1982551]# rpm -qa | grep -E "openvswitch2.15|ovn2.13" ovn2.13-central-20.12.0-178.el8fdp.x86_64 python3-openvswitch2.15-2.15.0-38.el8fdp.x86_64 ovn2.13-20.12.0-178.el8fdp.x86_64 ovn2.13-host-20.12.0-178.el8fdp.x86_64 openvswitch2.15-2.15.0-38.el8fdp.x86_64
(In reply to Jianlin Shi from comment #7) > but there is warn in ovn-northd.log: > > [root@wsfd-advnetlab16 ~]# grep WARN /var/log/ovn/ovn-northd.log > 2021-09-18T06:01:37.909Z|00008|ovn_northd|WARN|bad ipv6 address upstream fix: http://patchwork.ozlabs.org/project/ovn/patch/b1dacd1f521a44b4bb2de5104b90221499d54f61.1632307044.git.lorenzo.bianconi@redhat.com/
for issue in comment 7, submit another bug to track: https://bugzilla.redhat.com/show_bug.cgi?id=2007055 set VERIFIED for this one
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (ovn2.13 bug fix and enhancement update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:3717