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| English | French |
| IP-in-IP tunnel | Tunnel IP-in-IP/tunnel IP dans IP (The encapsulation of an IP multicast datagram within an IP unicast datagram, so as to forward information between endpoints in an IP internetwork that have differing capabilities, thus acting as a logical link between the endpoints) |
| tunnel server | serveur tunnel (A server or router that terminates tunnels and forwards traffic to the hosts on the target network) |