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-How to connect VPP instances using IKEv2
-========================================
-
-This section describes how to initiate IKEv2 session between two VPP instances
-using Linux veth interfaces and namespaces.
-
-
-Create veth interfaces and namespaces and configure it:
-
-```
-sudo ip link add ifresp type veth peer name ifinit
-sudo ip link set dev ifresp up
-sudo ip link set dev ifinit up
-
-sudo ip netns add clientns
-sudo ip netns add serverns
-sudo ip link add veth_client type veth peer name client
-sudo ip link add veth_server type veth peer name server
-sudo ip link set dev veth_client up netns clientns
-sudo ip link set dev veth_server up netns serverns
-
-sudo ip netns exec clientns \
-      bash -c "
-              ip link set dev lo up
-              ip addr add 192.168.5.2/24 dev veth_client
-              ip addr add fec5::2/16 dev veth_client
-              ip route add 192.168.3.0/24 via 192.168.5.1
-              ip route add fec3::0/16 via fec5::1
-      "
-
-sudo ip netns exec serverns \
-      bash -c "
-              ip link set dev lo up
-              ip addr add 192.168.3.2/24 dev veth_server
-              ip addr add fec3::2/16 dev veth_server
-              ip route add 192.168.5.0/24 via 192.168.3.1
-              ip route add fec5::0/16 via fec3::1
-      "
-```
-
-Run responder VPP:
-
-```
-sudo /usr/bin/vpp unix { \
-      cli-listen /tmp/vpp_resp.sock \
-      gid $(id -g) } \
-      api-segment { prefix vpp } \
-      plugins { plugin dpdk_plugin.so { disable } }
-```
-
-Configure the responder
-
-
-```
-create host-interface name ifresp
-set interface ip addr host-ifresp 192.168.10.2/24
-set interface state host-ifresp up
-
-create host-interface name server
-set interface ip addr host-server 192.168.3.1/24
-set interface state host-server up
-
-ikev2 profile add pr1
-ikev2 profile set pr1 auth shared-key-mic string Vpp123
-ikev2 profile set pr1 id local ipv4 192.168.10.2
-ikev2 profile set pr1 id remote ipv4 192.168.10.1
-
-ikev2 profile set pr1 traffic-selector local ip-range 192.168.3.0 - 192.168.3.255 port-range 0 - 65535 protocol 0
-ikev2 profile set pr1 traffic-selector remote ip-range 192.168.5.0 - 192.168.5.255 port-range 0 - 65535 protocol 0
-
-create ipip tunnel src 192.168.10.2 dst 192.168.10.1
-ikev2 profile set pr1 tunnel ipip0
-ip route add 192.168.5.0/24 via 192.168.10.1 ipip0
-set interface unnumbered ipip0 use host-ifresp
-```
-
-Run initiator VPP:
-
-```
-sudo /usr/bin/vpp unix { \
-      cli-listen /tmp/vpp_init.sock \
-      gid $(id -g) } \
-      api-segment { prefix vpp } \
-      plugins { plugin dpdk_plugin.so { disable } }
-```
-
-Configure initiator:
-```
-create host-interface name ifinit
-set interface ip addr host-ifinit 192.168.10.1/24
-set interface state host-ifinit up
-
-create host-interface name client
-set interface ip addr host-client 192.168.5.1/24
-set interface state host-client up
-
-ikev2 profile add pr1
-ikev2 profile set pr1 auth shared-key-mic string Vpp123
-ikev2 profile set pr1 id local ipv4 192.168.10.1
-ikev2 profile set pr1 id remote ipv4 192.168.10.2
-
-ikev2 profile set pr1 traffic-selector remote ip-range 192.168.3.0 - 192.168.3.255 port-range 0 - 65535 protocol 0
-ikev2 profile set pr1 traffic-selector local ip-range 192.168.5.0 - 192.168.5.255 port-range 0 - 65535 protocol 0
-
-ikev2 profile set pr1 responder host-ifinit 192.168.10.2
-ikev2 profile set pr1 ike-crypto-alg aes-gcm-16 256 ike-dh modp-2048
-ikev2 profile set pr1 esp-crypto-alg aes-gcm-16 256
-
-create ipip tunnel src 192.168.10.1 dst 192.168.10.2
-ikev2 profile set pr1 tunnel ipip0
-ip route add 192.168.3.0/24 via 192.168.10.2 ipip0
-set interface unnumbered ipip0 use host-ifinit
-```
-
-Initiate the IKEv2 connection:
-
-```
-vpp# ikev2 initiate sa-init pr1
-```
-
-Responder's and initiator's private networks are now connected with IPSEC tunnel:
-
-```
-$ sudo ip netns exec clientns ping 192.168.3.1
-PING 192.168.3.1 (192.168.3.1) 56(84) bytes of data.
-64 bytes from 192.168.3.1: icmp_seq=1 ttl=63 time=1.64 ms
-64 bytes from 192.168.3.1: icmp_seq=2 ttl=63 time=7.24 ms
-```