# show VPN objects
openstack vpn ipsec site connection list
openstack vpn endpoint group list
openstack vpn service list
openstack vpn ipsec policy list
openstack vpn ike policy list

# show IP
openstack vpn service list --long
openstack vpn service list -c ID -f value | xargs -i openstack vpn service show {}
openstack vpn ipsec site connection list -c ID -f value | xargs -L1 openstack vpn ipsec site connection show

Restart VPN

openstack vpn ipsec site connection set --disable vpn-conn1
openstack vpn ipsec site connection set --enable vpn-conn1

Check VPN peer address

PRIVATE_PEER_ADDRESSES=$(openstack vpn ipsec site connection list -c "Peer Address" -f value | egrep "^10.|^172.|^192.")
for PRIVATE_PEER_ADDRESSE in ${PRIVATE_PEER_ADDRESSES}; do
    echo "PRIVATE_PEER_ADDRESSES: ${PRIVATE_PEER_ADDRESSE}"

    CONNECTION_ID=$(openstack vpn ipsec site connection list | grep ${PRIVATE_PEER_ADDRESSE} | cut -d" " -f2)
    openstack vpn ipsec site connection show ${CONNECTION_ID}

    VPN_SERVICE_ID=$(openstack vpn ipsec site connection show ${CONNECTION_ID} -c "VPN Service" -f value)
    openstack vpn service show ${VPN_SERVICE_ID}

    PROJECT_ID=$(openstack vpn service show ${VPN_SERVICE_ID} -c project_id -f value)
    openstack project show ${PROJECT_ID}
done

OpenStack IpSec VPN ports

UDP 500
UDP 4500
ESP IP Protocol 50

IPSec VPN – Diffie-Hellman Groups

DH Group 1:    768-bit Key
DH Group 2:   1024-bit Key
DH Group 5:   1536-bit Key
DH Group 14:  2048-bit Key

Links
https://docs.openstack.org/neutron/rocky/admin/vpnaas-scenario.html