1 alice: network vpn ipsec connection basic local prefix 192.168.200.0/24
2 alice: network vpn ipsec connection basic remote prefix 192.168.201.0/24
3 bob: network vpn ipsec connection basic local prefix 192.168.201.0/24
4 bob: network vpn ipsec connection basic remote prefix 192.168.200.0/24