Testing ovn manually based on LXD (by quqi99)

Posted 2022-08-02 quqi99

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作者：张华发表于：2022-05-27
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准备两个LXD容器

$ lxc list
+--------+---------+-----------------------+------+-----------+-----------+
|  NAME  |  STATE  |         IPV4          | IPV6 |   TYPE    | SNAPSHOTS |
+--------+---------+-----------------------+------+-----------+-----------+
| master | RUNNING | 192.168.122.20 (ens3) |      | CONTAINER | 0         |
+--------+---------+-----------------------+------+-----------+-----------+
| node1  | RUNNING | 192.168.122.21 (ens3) |      | CONTAINER | 0         |
+--------+---------+-----------------------+------+-----------+-----------+

步骤如下:

# install lxd, refer - https://blog.csdn.net/quqi99/article/details/52131486
sudo snap install lxd --classic
sudo usermod -aG $USER lxd
# MUST NOT use sudo, so must cd to home dir to run it
cd ~ && lxd init --auto
sudo chown -R $USER ~/.config/
export EDITOR=vim

# use static subnet 192.168.122.0/24 (qemu also uses this subnet) for lxd as well
sudo virsh net-destroy default
lxc network show lxdbr0
lxc network set lxdbr0 ipv4.address=192.168.122.1/24
lxc network set lxdbr0 ipv6.address none
ip addr show lxdbr0
sudo iptables-save |grep 192.168.122
ps -ef |grep 192.168.122

# set lxc profile - https://github.com/openstack-charmers/openstack-on-lxd.git
cat << EOF | tee ./lxd-profile.yaml
config:
  boot.autostart: "true"
  linux.kernel_modules: openvswitch,nbd,ip_tables,ip6_tables
  security.nesting: "true"
  security.privileged: "true"
description: ""
devices:
  ens3:
    mtu: "9000"
    name: ens3
    nictype: bridged
    parent: lxdbr0
    type: nic
  ens8:
    mtu: "9000"
    name: ens8
    nictype: bridged
    parent: lxdbr0
    type: nic
  kvm:
    path: /dev/kvm
    type: unix-char
  mem:
    path: /dev/mem
    type: unix-char
  root:
    path: /
    pool: default
    type: disk
  tun:
    path: /dev/net/tun
    type: unix-char
name: juju-default
used_by: []
EOF
lxc profile create juju-default 2>/dev/null || echo "juju-default profile already exists"
cat ./lxd-profile.yaml |lxc profile edit juju-default
#lxc profile device set juju-default root pool=default
lxc profile show juju-default

# create two test lxd containers
lxc network show lxdbr0
cat << EOF | tee network.yml
version: 1
config:
  - type: physical
    name: ens3
    subnets:
      - type: static
        ipv4: true
        address: 192.168.122.20
        netmask: 255.255.255.0
        gateway: 192.168.122.1
        control: auto
  - type: nameserver
    address: 8.8.8.8
EOF
lxc launch ubuntu:focal master -p juju-default --config=user.network-config="$(cat network.yml)"
cat << EOF | tee network.yml
version: 1
config:
  - type: physical
    name: ens3
    subnets:
      - type: static
        ipv4: true
        address: 192.168.122.21
        netmask: 255.255.255.0
        gateway: 192.168.122.1
        control: auto
  - type: nameserver
    address: 192.168.99.1
EOF
lxc launch ubuntu:focal node1 -p juju-default --config=user.network-config="$(cat network.yml)"
lxc exec `lxc list |grep master |awk -F '|' 'print $2'` bash
lxc exec `lxc list |grep node1 |awk -F '|' 'print $2'` bash

安装OVN

master节点将同时作为控制面与数据面, 所以除了安装ovn-central, 也安装了ovn-host与openvswitch-switch

#on master, 
lxc exec `lxc list |grep master |awk -F '|' 'print $2'` bash
apt install ovn-central openvswitch-switch ovn-host net-tools -y
ovn-nbctl set-connection ptcp:6641
ovn-sbctl set-connection ptcp:6642
netstat -lntp |grep 664

#on node1 and master
lxc exec `lxc list |grep node1 |awk -F '|' 'print $2'` bash
apt install openvswitch-switch ovn-host net-tools -y
ovs-vsctl add-br br-int
ovs-vsctl set bridge br-int protocols=OpenFlow10,OpenFlow11,OpenFlow12,OpenFlow13,OpenFlow14,OpenFlow15

#on all compute nodes (both master and node1), make ovn-controller connect to southbound db
ovs-vsctl set open_vswitch .  \\
  external_ids:ovn-remote=tcp:192.168.122.20:6642 \\
  external_ids:ovn-encap-ip=$(ip addr show ens3| awk '$1 == "inet" print $2' | cut -f1 -d/) \\
  external_ids:ovn-encap-type=geneve \\
  external_ids:system-id=$(hostname)

逻辑拓扑, 物理拓扑及实现

geneve tunnel用于东西向流量
br-int -> provnet-xxx -> br-ens8用于南北向流量

注意: 下列使用’sudo ovn-nbctl lsp-set-addresses’时有时会报错"Invalid address format’ , 那是因为带sudo时命令行输入参数中的双引号被shell吃掉了.

$ sudo ovn-nbctl lsp-set-addresses sw0-port1 "00:00:00:00:00:03 10.0.0.4"
ovn-nbctl: 10.0.0.4: Invalid address format. See ovn-nb(5). Hint: An Ethernet address must be listed before an IP address, together as a single argument.

可以改用dyminic来分配bypass

sudo ovn-nbctl set Logical_Switch sw0 other_config:subnet=10.0.0.0/24
sudo ovn-nbctl lsp-set-addresses sw0-port1 "dynamic"
sudo ovn-nbctl --columns=name,dynamic_addresses,addresses list logical_switch_port

或者在root用户下命令来bypass.

# create vRouer (lr1) and two vSwitch (ls1 and ls2)
ovn-nbctl ls-add ls1
ovn-nbctl ls-add ls2
ovn-nbctl lr-add lr1

# dhcp for ls1
#ovn-nbctl set logical_switch ls1 other_config:subnet="10.10.10.0/24" other_config:exclude_ips="10.10.10.2..10.10.10.10"
#ovn-nbctl dhcp-options-create 10.10.10.0/24
#DHCP_UUID=$(ovn-nbctl --bare --columns=_uuid find dhcp_options cidr="10.10.10.0/24")
#ovn-nbctl dhcp-options-set-options $DHCP_UUID lease_time=3600 router=10.10.10.1 server_id=10.10.10.1 server_mac=c0:ff:ee:00:00:01
#ovn-nbctl list dhcp_options

# connect ls1 to lr1
ovn-nbctl lrp-add lr1 lr1-ls1 00:00:00:00:00:01 10.10.10.1/24
ovn-nbctl lsp-add ls1 ls1-lr1
ovn-nbctl lsp-set-type ls1-lr1 router
ovn-nbctl lsp-set-addresses ls1-lr1 00:00:00:00:00:01
ovn-nbctl lsp-set-options ls1-lr1 router-port=lr1-ls1

# connect ls2 to lr1
ovn-nbctl lrp-add lr1 lr1-ls2 00:00:00:00:00:02 10.10.20.1/24
ovn-nbctl lsp-add ls2 ls2-lr1
ovn-nbctl lsp-set-type ls2-lr1 router
ovn-nbctl lsp-set-addresses ls2-lr1 00:00:00:00:00:02
ovn-nbctl lsp-set-options ls2-lr1 router-port=lr1-ls2

# create 4 test VMs on two chassises
ovn-nbctl lsp-add ls1 ls1-vm1
ovn-nbctl lsp-set-addresses ls1-vm1 "00:00:00:00:00:03 10.10.10.2"
ovn-nbctl lsp-set-port-security ls1-vm1 "00:00:00:00:00:03 10.10.10.2"
ovn-nbctl lsp-add ls1 ls1-vm2
ovn-nbctl lsp-set-addresses ls1-vm2 "00:00:00:00:00:04 10.10.10.3"
ovn-nbctl lsp-set-port-security ls1-vm2 "00:00:00:00:00:04 10.10.10.3"
ovn-nbctl lsp-add ls2 ls2-vm1
ovn-nbctl lsp-set-addresses ls2-vm1 "00:00:00:00:00:03 10.10.20.2"
ovn-nbctl lsp-set-port-security ls2-vm1 "00:00:00:00:00:03 10.10.20.2"
ovn-nbctl lsp-add ls2 ls2-vm2
ovn-nbctl lsp-set-addresses ls2-vm2 "00:00:00:00:00:04 10.10.20.3"
ovn-nbctl lsp-set-port-security ls2-vm2 "00:00:00:00:00:04 10.10.20.3"

# on master
ip netns add vm1
ovs-vsctl add-port br-int vm1 -- set interface vm1 type=internal
ip link set vm1 netns vm1
ip netns exec vm1 ip link set vm1 address 00:00:00:00:00:03
ip netns exec vm1 ip addr add 10.10.10.2/24 dev vm1
ip netns exec vm1 ip link set vm1 up
ip netns exec vm1 ip route add default via 10.10.10.1 dev vm1
ovs-vsctl set Interface vm1 external_ids:iface-id=ls1-vm1
ip netns add vm2
ovs-vsctl add-port br-int vm2 -- set interface vm2 type=internal
ip link set vm2 netns vm2
ip netns exec vm2 ip link set vm2 address 00:00:00:00:00:04
ip netns exec vm2 ip addr add 10.10.10.3/24 dev vm2
ip netns exec vm2 ip link set vm2 up
ip netns exec vm2 ip route add default via 10.10.10.1 dev vm2
ovs-vsctl set Interface vm2 external_ids:iface-id=ls1-vm2

# on node1
ip netns add vm1
ovs-vsctl add-port br-int vm1 -- set interface vm1 type=internal
ip link set vm1 netns vm1
ip netns exec vm1 ip link set vm1 address 00:00:00:00:00:03
ip netns exec vm1 ip addr add 10.10.20.2/24 dev vm1
ip netns exec vm1 ip link set vm1 up
ip netns exec vm1 ip route add default via 10.10.20.1 dev vm1
ovs-vsctl set Interface vm1 external_ids:iface-id=ls2-vm1
ip netns add vm2
ovs-vsctl add-port br-int vm2 -- set interface vm2 type=internal
ip link set vm2 netns vm2
ip netns exec vm2 ip link set vm2 address 00:00:00:00:00:04
ip netns exec vm2 ip addr add 10.10.20.3/24 dev vm2
ip netns exec vm2 ip link set vm2 up
ip netns exec vm2 ip route add default via 10.10.20.1 dev vm2
ovs-vsctl set Interface vm2 external_ids:iface-id=ls2-vm2

# create the static route
ovn-nbctl lr-route-add lr1 "0.0.0.0/0" 10.10.40.1

# create ha-chassis-group
ovn-nbctl lrp-add lr1 lr1-lslocal 00:00:00:00:00:05 10.10.40.1/24
ovn-nbctl ha-chassis-group-add ha1
ovn-nbctl ha-chassis-group-add-chassis ha1 master 1
ovn-nbctl ha-chassis-group-add-chassis ha1 node1 2
ha1_uuid=`ovn-nbctl --bare --columns _uuid find ha_chassis_group name="ha1"`
ovn-nbctl set Logical_Router_Port  lr1-lslocal ha_chassis_group=$ha1_uuid

# connect lslocal to lr1
ovn-nbctl ls-add lslocal
ovn-nbctl lsp-add lslocal lslocal-lr1
ovn-nbctl lsp-set-type lslocal-lr1 router
ovn-nbctl lsp-set-addresses lslocal-lr1 00:00:00:00:00:05
ovn-nbctl lsp-set-options lslocal-lr1 router-port=lr1-lslocal

ovn-nbctl lsp-add lslocal lslocal-localnet
ovn-nbctl lsp-set-addresses lslocal-localnet unknown
ovn-nbctl lsp-set-type lslocal-localnet localnet
ovn-nbctl lsp-set-options lslocal-localnet network_name=externalnet

# on master
ovs-vsctl add-br br-ens8
ovs-vsctl add-port br-ens8 ens8
ovs-vsctl set Open_vSwitch . external-ids:ovn-bridge-mappings=externalnet:br-ens8
#ovn-nbctl lrp-set-gateway-chassis lr1-lslocal master 1
#ovn-nbctl lrp-set-gateway-chassis lr1-lslocal node1 2
ovs-vsctl set Open_vSwitch . external-ids:ovn-cms-options=\\"enable-chassis-as-gw\\"
ip link set dev br-ens8 up
ip addr add 10.10.40.2/24 dev br-ens8
ovs-vsctl get Open_vSwitch . external-ids

# on node1
ovs-vsctl add-br br-ens8
ovs-vsctl add-port br-ens8 ens8
ovs-vsctl set Open_vSwitch . external-ids:ovn-bridge-mappings=externalnet:br-ens8
#ovn-nbctl lrp-set-gateway-chassis lr1-lslocal master 1
#ovn-nbctl lrp-set-gateway-chassis lr1-lslocal node1 2
ovs-vsctl set Open_vSwitch . external-ids:ovn-cms-options=\\"enable-chassis-as-gw\\"
ip link set dev br-ens8 up
ip addr add 10.10.40.3/24 dev br-ens8

# add NAT item
ovn-nbctl -- --id=@nat create nat type="snat" logical_ip=10.10.10.0/24 \\
external_ip=10.10.40.1 -- add logical_router lr1 nat @nat

# query ways
ovn-nbctl list gateway_chassis
ovn-nbctl show
ovn-nbctl list logical_router
ovn-nbctl list logical_router_port
ovn-nbctl list logical_switch
ovn-nbctl list logical_switch_port
ovn-nbctl list ha_chassis_group
ovn-nbctl -f csv list ha_chassis |egrep -v '^_uuid' |sort -t ',' -k 4

ovn-sbctl show
ovn-sbctl list Port_Binding

ovs-vsctl show

测试结果

# Test
root@master:~# ip netns exec vm1 ping 10.10.20.3 -c1
PING 10.10.20.3 (10.10.20.3) 56(84) bytes of data.
64 bytes from 10.10.20.3: icmp_seq=1 ttl=63 time=0.146 ms

root@master:~# ip netns exec vm1 ping 10.10.40.1 -c1
PING 10.10.40.1 (10.10.40.1) 56(84) bytes of data.
64 bytes from 10.10.40.1: icmp_seq=1 ttl=254 time=0.276 ms

一些输出

root@master:~# ovn-nbctl show
switch 31f0f2f4-1a02-4efd-8731-09993279f917 (lslocal)
    port lslocal-localnet
        type: localnet
        addresses: ["unknown"]
    port lslocal-lr1
        type: router
        addresses: ["00:00:00:00:00:05"]
        router-port: lr1-lslocal
switch fae87181-383e-41eb-8c41-5a6b52c358ca (ls1)
    port ls1-vm2
        addresses: ["00:00:00:00:00:04 10.10.10.3"]
    port ls1-lr1
        type: router
        addresses: ["00:00:00:00:00:01"]
        router-port: lr1-ls1
    port ls1-vm1
        addresses: ["00:00:00:00:00:03 10.10.10.2"]
switch bf707a77-f6a0-4bd6-9549-fb3027a4b539 (ls2)
    port ls2-lr1
        type: router
        addresses: ["00:00:00:00:00:02"]
        router-port: lr1-ls2
    port ls2-vm1
        addresses: ["00:00:00:00:00:03 10.10.20.2"]
    port ls2-vm2
        addresses: ["00:00:00:00:00:04 10.10.20.3"]
router d872c966-89f7-46db-b5dd-362315042b35 (lr1)
    port lr1-ls2
        mac: "00:00:00:00:00:02"
        networks: ["10.10.20.1/24"]
    port lr1-ls1
        mac: "00:00:00:00:00:01"
        networks: ["10.10.10.1/24"]
    port lr1-lslocal
        mac: "00:00:00:00:00:05"
        networks: ["10.10.40.1/24"]
        gateway chassis: [node1 master]
    nat 62e5b090-b6a7-416c-8f8c-a4c4f9290236
        external ip: "10.10.40.1"
        logical ip: "10.10.10.0/24"
        type: "snat"

root@master:~# ovn-sbctl show
Chassis master
    hostname: master
    Encap geneve
        ip: "192.168.122.20"
        options: csum="true"
    Port_Binding ls1-vm1
    Port_Binding ls1-vm2
Chassis node1
    hostname: node1
    Encap geneve
        ip: "192.168.122.21"
        options: csum="true"
    Port_Binding cr-lr1-lslocal
    Port_Binding ls2-vm2
    Port_Binding ls2-vm1

root@master:~# ovs-vsctl show
7fa21184-4091-4c56-bf22-f27bd43b049d
    Bridge br-ens8
        Port br-ens8
            Interface br-ens8
                type: internal
        Port ens8
            Interface ens8
        Port patch-lslocal-localnet-to-br-int
            Interface patch-lslocal-localnet-to-br-int
                type: patch
                options: peer=patch-br-int-to-lslocal-localnet
    Bridge br-int
        Port vm2
            Interface vm2
                type: internal
        Port ovn-node1-0
            Interface ovn-node1-0
                type: geneve
                options: csum="true", key=flow, remote_ip="192.168.122.21"
                bfd_status: diagnostic="No Diagnostic", flap_count="1", forwarding="true", remote_diagnostic="No Diagnostic", remote_state=up, state=up
        Port br-int
            Interface br-int
                type: internal
        Port vm1
            Interface vm1
                type: internal
        Port patch-br-int-to-lslocal-localnet
            Interface patch-br-int-to-lslocal-localnet
                type: patch
                options: peer=patch-lslocal-localnet-to-br-int
    ovs_version: "2.13.5"
root@node1:~# ovs-vsctl show
1f40614f-ea1f-40c5-b564-97e7d4a678e6
    Bridge br-ens8
        Port br-ens8
            Interface br-ens8
                type: internal
        Port ens8
            Interface ens8
        Port patch-lslocal-localnet-to-br-int
            Interface patch-lslocal-localnet-to-br-int
                type: patch
                options: peer=patch-br-int-to-lslocal-localnet
    Bridge br-int
        Port vm1
            Interface vm1
                type: internal
        Port patch-br-int-to-lslocal-localnet
            Interface patch-br-int-to-lslocal-localnet
                type: patch
                options: peer=patch-lslocal-localnet-to-br-int
        Port ovn-master-0
            Interface ovn-master-0
                type: geneve
                options: csum="true", key=flow, remote_ip="192.168.122.20"
                bfd_status: diagnostic="No Diagnostic", flap_count="1", forwarding="true", remote_diagnostic="No Diagnostic", remote_state=up, state=up
        Port br-int
            Interface br-int
                type: internal
        Port vm2
            Interface vm2
                type: internal
    ovs_version: "2.13.5"

root@master:~# ovn-nbctl list ha_chassis_group
_uuid               : c843f65f-a215-4bd7-8427-c2da6ec33cf8
external_ids        : 
ha_chassis          : [25448727-ce5f-4676-974e-ef7d3e1ee915, d236dd68-c65b-4842-8e8d-b999d6895e09]
name                : ha1
root@master:~# ovn-nbctl -f csv list ha_chassis |egrep -v '^_uuid' |sort -t ',' -k 4
25448727-ce5f-4676-974e-ef7d3e1ee915,master,,1
d236dd68-c65b-4842-8e8d-b999d6895e09,node1,,2

root@master:~# ovn-nbctl list gateway_chassis
_uuid               : 3d670f79-fe01-432c-93d1-113aa5747fcc
chassis_name        : master
external_ids        : 
name                : lr1-lslocal-master
options             : 
priority            : 1
_uuid               : 0b6cc1ab-bb03-4674-81c9-1257bcfcbd7c
chassis_name        : node1
external_ids        : 
name                : lr1-lslocal-node1
options             : 
priority            : 2

root@master:~# ovs-vsctl get Open_vSwitch . external-ids
hostname=master, ovn-bridge-mappings="externalnet:br-ens8", ovn-cms-options=enable-chassis-as-gw, ovn-encap-ip="192.168.122.20", ovn-encap-type=geneve, ovn-remote="tcp:192.168.122.20:6642", rundir="/var/run/openvswitch", system-id=master

root@node1:~# ovs-vsctl get Open_vSwitch . external-ids
hostname=node1, ovn-bridge-mappings="externalnet:br-ens8", ovn-cms-options=enable-chassis-as-gw, ovn-encap-ip="192.168.122.21", ovn-encap-type=geneve, ovn-remote="tcp:192.168.122.20:6642", rundir="/var/run/openvswitch", system-id=node1

20220606更新 - 只用一个lxd容器测试从localport到localnet的流量

实际在模拟https://blog.csdn.net/quqi99/article/details/116893909中的sriov vm external port到metadata localport的流量
如图（采用tps://www.processon.com/diagrams绘制），它实现了如下物理拓扑(见：https://bugzilla.redhat.com/show_bug.cgi?id=1974062)：

相比上例, 这里只有一个vSwitch, 没有vRouter, 所以VM与external network同子网. 也只在一台lxd容器里运行(vSwitch与有多少台host无关 )
br-int (ls) 上两个localport用于模拟VM (lp=10.0.0.1, lsp=10.0.0.2)
vSwitch有一个localnet port (ln)用于和external network关联, 这样在br-int与br-phys之间会有一对veth pair, ls与br-int是通过这样关联的(ovs-vsctl add-port br-int lp – set interface lp type=internal external_ids:iface-id=lp)
br-phys再创建一个localport用于模拟externa network上的一个VM(ext1=10.0.0.4)
当从lp=10.0.0.1往ext1=10.0.0.4正常情况下应该是可以用tcpdump抓到icmp包的，但由于ovn bug(https://github.com/ovn-org/ovn/commit/1148580290d0ace803f20aeaa0241dd51c100630) 抓不着 - https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1943266

实现步骤如下：

cat << EOF | tee network.yml
version: 1
config:
  - type: physical
    name: ens3
    subnets:
      - type: static
        ipv4: true
        address: 192.168.122.122
        netmask: 255.255.255.0
        gateway: 192.168.122.1
        control: auto
  - type: nameserver
    address: 192.168.99.1
EOF
lxc launch ubuntu:focal hv1 -p juju-default --config=user.network-config="$(cat network.yml)"

lxc exec `lxc list |grep hv1 |awk -F '|' 'print $2'` bash
apt install ovn-central openvswitch-switch ovn-host net-tools -y
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:192.168.122.122:6642 external_ids:ovn-encap-type=geneve external_ids:ovn-encap-ip=192.168.122.122
ovs-vsctl add-br br-phys
ip link set br-phys up          
ovs-vsctl set open . external-ids:ovn-bridge-mappings=phys:br-phys
systemctl restart ovn-controller

ovn-nbctl ls-add ls

ovn-nbctl lsp-add ls ln \\
    -- lsp-set-type ln localnet \\
    -- lsp-set-addresses ln unknown \\
    -- lsp-set-options ln network_name=phys

ovn-nbctl --wait=sb ha-chassis-group-add hagrp
ovn-nbctl --wait=sb ha-chassis-group-add-chassis hagrp hv1 10

#create two external port to similute sriov port (for dhcp and metdata)
ovn-nbctl lsp-add ls lext
ovn-nbctl lsp-set-addresses lext "00:00:00:00:00:04 10.0.0.4 2001::4"
ovn-nbctl lsp-set-type lext external                                     
hagrp_uuid=`ovn-nbctl --bare --columns _uuid find ha_chassis_group name=hagrp`
ovn-nbctl set logical_switch_port lext ha_chassis_group=$hagrp_uuid  
ovn-nbctl lsp-add ls lext2
ovn-nbctl lsp-set-addresses lext2 "00:00:00:00:00:10 10.0.0.10 2001::10"
ovn-nbctl lsp-set-type lext2 external
ovn-nbctl set logical_switch_port lext2 ha_chassis_group=$hagrp_uuid
ovn-nbctl --wait=hv sync

# create a test VM(10.0.0.101) on external network
ovs-vsctl add-port br-phys ext1 -- set interface ext1 type=internal
ip netns add ext1
ip link set ext1 netns ext1
ip netns exec ext1 ip link set ext1 up
ip netns exec ext1 ip addr add 10.0.0.101/24 dev ext1
ip netns exec ext1 ip addr add 2001::101/64 dev ext1

# create two test VMs (10.0.0.1 and 10.0.0.2)            
ovn-nbctl lsp-add ls lp \\
    -- lsp-set-type lp localport \\
    -- lsp-set-addresses lp "00:00:00:00:00:01 10.0.0.1 2001::1" \\
    -- lsp-add ls lsp \\
    -- lsp-set-addresses lsp "00:00:00:00:00:02 10.0.0.2 2001::2"
ovs-vsctl add-port br-int lp -- set interface lp type=internal external_ids:iface-id=lp
ip netns add lp
ip link set lp netns lp
ip netns exec lp ip link set lp address 00:00:00:00:00:01
ip netns exec lp ip link set lp up
ip netns exec lp ip addr add 10.0.0.1/24 dev lp
ip netns exec lp ip addr add 2001::1/64 dev lp
ovn-nbctl --wait=hv sync
ovs-vsctl add-port br-int lsp -- set interface lsp type=internal external_ids:iface-id=lsp options:tx_pcap=lsp.pcap options:rxq_pcap=lsp-rx.pcap
ip netns add lsp
ip link set lsp netns lsp
ip netns exec lsp ip link set lsp address 00:00:00:00:00:02
ip netns exec lsp ip link set lsp up
ip netns exec lsp ip addr add 10.0.0.2/24 dev lsp
ip netns exec lsp ip addr add 2001::2/64 dev lsp

# start tcpdump process
ip netns exec ext1 tcpdump -i ext1 -w ext1.pcap &
ip netns exec lsp tcpdump -i lsp -w lsp.pcap &
sleep 2

# VM(local port) ping lext(extenal port)
ip netns exec lp ip neigh add 10.0.0.4 lladdr 00:00:00:00:00:04 dev lp
ip netns exec lp ip -6 neigh add 2001::4 lladdr 00:00:00:00:00:04 dev lp
ip netns exec lp ip neigh add 10.0.0.10 lladdr 00:00:00:00:00:10 dev lp
ip netns exec lp ip -6 neigh add 2001::10 lladdr 00:00:00:00:00:10 dev lp
ip netns exec lp ping 10.0.0.4 -c 1 -w 1 -W 1
ip netns exec lp ping 10.0.0.10 -c 1 -w 1 -W 1
ip netns exec lp ping6 2001::4 -c 1 -w 1 -W 1
ip netns exec lp ping6 2001::10 -c 1 -w 1 -W 1
sleep 1
pkill tcpdump
sleep 1

# analysis tcpdump output
tcpdump -r ext1.pcap -nnle
tcpdump  -r ext1.pcap  -nnle host 10.0.0.4 or host 10.0.0.10 or host 2001::4 or host 2001::10

reference

[1] ovn通过分布式网关端口连接外部网络 - https://www.jianshu.com/p/dc565d6aaebd
[2] https://www.jianshu.com/p/44153cf101dd

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