Tunnel interface 380 ^tun[0-9]+$ tunnel interface must be named tunN tunN Tunnel interface name #include #include #include #include #include #include 1476 #include #include #include #include #include 6rd network prefix ipv6 IPv6 address and prefix length 6rd relay prefix ipv4net IPv4 prefix of interface for 6rd Encapsulation of this tunnel interface gre gretap ip6gre ip6ip6 ipip ipip6 sit gre Generic Routing Encapsulation gretap Generic Routing Encapsulation bridge interface ip6gre GRE over IPv6 network ip6ip6 IP6 in IP6 encapsulation ipip IP in IP encapsulation ipip6 IP in IP6 encapsulation sit Simple Internet Transition encapsulation ^(gre|gretap|ip6gre|ip6ip6|ipip|ipip6|sit)$ Invalid encapsulation, must be one of: gre, gretap, ipip, sit, ipip6, ip6ip6, ip6gre Multicast operation over tunnel enable disable enable Enable Multicast disable Disable Multicast (default) ^(enable|disable)$ Must be 'disable' or 'enable' Tunnel parameters IPv4 specific tunnel parameters Disable Path MTU Discovery on this tunnel Enable IPv4 DF suppression on this tunnel #include #include #include 64 IPv6 specific tunnel parameters Set fixed encapsulation limit none u32:0-255 Encaplimit none Encaplimit disabled ^(none)$ Tunnel encaplimit must be 0-255 or none 4 #include Hoplimit u32:0-255 Hoplimit (default 64) hoplimit must be between 0-255 64 Traffic class (Tclass) 0x0-0x0fffff Traffic class, 'inherit' or hex value (0x){0,1}(0?[0-9A-Fa-f]{1,2}) Must be 'inherit' or a number inherit