ip tunnel

Tunnel configuration. tunnel can be abbreviated to t

ip tunnel add - add a new tunnel
ip tunnel change - change an existing tunnel
ip tunnel delete - destroy a tunnel
ip tunnel prl - potential router list (ISATAP only)
ip tunnel show - list tunnels

      ip tunnel { add | change | del | show | prl } [ NAME ] [ mode MODE ] [ remote ADDR ]
         [ local ADDR ] [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ] ] [ encaplimit ELIM ] [ ttl TTL ]
            [ tos TOS ] [ flowlabel FLOWLABEL ] [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]
               [ [no]pmtudisc ] [ dev PHYS_DEV ] [ dscp inherit ]

         MODE := { ipip | gre | sit | isatap | ip6ip6 | ipip6 | any }

         ADDR := { IP_ADDRESS | any }

         TOS := { NUMBER | inherit }

         ELIM := { none | 0..255 }

         TTL := { 1..255 | inherit }

         KEY := { DOTTED_QUAD | NUMBER }

         TIME := NUMBER[s|ms|us|ns|j]

   name NAME (default)
      select the tunnel device name.

   mode MODE
      set the tunnel mode. Available modes depend on the encapsulating address family.
      Modes for IPv4 encapsulation available: ipip, sit, isatap and gre.
      Modes for IPv6 encapsulation available: ip6ip6, ipip6 and any.

   remote ADDRESS
      set the remote endpoint of the tunnel.

   local ADDRESS
      set the fixed local address for tunneled packets. It must be an address on another interface of this host.

   ttl N
      set a fixed TTL N on tunneled packets. N is a number in the range 1--255.
      0 is a special value meaning that packets inherit the TTL value.
      The default value for IPv4 tunnels is: inherit. The default value for IPv6 tunnels is: 64.

   tos T
   dsfield T
   tclass T
      set a fixed TOS (or traffic class in IPv6) T on tunneled packets.
      The default value is: inherit.

   dev NAME
      bind the tunnel to the device NAME so that tunneled packets will only be routed
      via this device and will not be able to escape to another device when the route to endpoint changes.

      disable Path MTU Discovery on this tunnel.
      It is enabled by default. Note that a fixed ttl is incompatible with this
      option: tunnelling with a fixed ttl always makes pmtu discovery.

   key K

   ikey K

   okey K
     (only GRE tunnels) use keyed GRE with key K.
     K is either a number or an IP address-like dotted quad.
     The key parameter sets the key to use in both directions.
     The ikey and okey parameters set different keys for input and output.

   csum, icsum, ocsum
      (only GRE tunnels) generate/require checksums for tunneled packets.
      The ocsum flag calculates checksums for outgoing packets.
      The icsum flag requires that all input packets have the correct checksum.
      The csum flag is equivalent to the combination icsum ocsum.

   seq, iseq, oseq
      (only GRE tunnels) serialize packets.
      The oseq flag enables sequencing of outgoing packets.
      The iseq flag requires that all input packets are serialized.
      The seq flag is equivalent to the combination iseq oseq. It doesn't work. Don't use it.

   dscp inherit
      (only IPv6 tunnels) Inherit DS field between inner and outer header.

   encaplim ELIM
      (only IPv6 tunnels) set a fixed encapsulation limit. Default is 4.

   flowlabel FLOWLABEL
      (only IPv6 tunnels) set a fixed flowlabel. 

ip tunnel prl - potential router list (ISATAP only)

   dev NAME
      mandatory device name. 
   prl-default ADDR
   prl-nodefault ADDR
   prl-delete ADDR
      Add or delete ADDR as a potential router or default router. 

ip tunnel show - list tunnels, This command has no arguments.

tunnel objects are tunnels, encapsulating packets in IP packets and then sending them over the IP infrastructure. The encapulating (or outer) address family is specified by the -f option. The default is IPv4.

“I felt as though I was driving in a tunnel. The whole circuit became a tunnel... I had reached such a high level of concentration that it was as if the car and I had become one. Together we were at the maximum. I was giving the car everything - and vice versa” ~ Ayrton Senna

Related linux commands

ip - Routing, devices and tunnels.
Equivalent Windows command: ROUTE - Manipulate network routing tables.

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