IP-TUNNEL(8) Linux IP-TUNNEL(8)
NAME
ip-tunnel - tunnel configuration
SYNOPSIS
ip tunnel help
ip [ OPTIONS ] tunnel { add | change | del | show | prl | 6rd } [ NAME ]
[ mode MODE ] [ remote ADDR ] [ local ADDR ]
[ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ] ]
[ encaplimit ELIM ] [ ttl|hoplimit TTL ]
[ tos TOS ] [ flowlabel FLOWLABEL ]
[ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]
[ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]
[ [no]pmtudisc ] [ dev PHYS_DEV ]
MODE := { ipip | gre | sit | isatap | vti | ip6ip6 | ipip6 | ip6gre | vti6 | any }
ADDR := { IP_ADDRESS | any }
TOS := { STRING | 00..ff | inherit | inherit/STRING | inherit/00..ff }
ELIM := { none | 0..255 }
TTL := { 1..255 | inherit }
KEY := { DOTTED_QUAD | NUMBER }
DESCRIPTION
tunnel objects are tunnels, encapsulating packets in IP packets and then sending them over the IP infrastruc‐
ture. The encapsulating (or outer) address family is specified by the -f option. The default is IPv4.
ip tunnel add
add a new tunnel
ip tunnel change
change an existing tunnel
ip tunnel delete
destroy a tunnel
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, vti, and gre.
Modes for IPv6 encapsulation available: ip6ip6, ipip6, ip6gre, vti6, and any.
remote ADDRESS
set the remote endpoint of the tunnel.
tos T
dsfield T
tclass T
set the type of service (IPv4) or traffic class (IPv6) field on tunneled packets, which can be
specified as either a two-digit hex value (e.g. c0) or a predefined string (e.g. internet). The
value inherit causes the field to be copied from the original IP header. The values
inherit/STRING or inherit/00..ff will set the field to STRING or 00..ff when tunneling non-IP
packets. The default value is 00.
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.
nopmtudisc
disable Path MTU Discovery on this tunnel. It is enabled by default. Note that a fixed ttl is
incompatible with this option: tunneling 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.
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
ip tunnel show
list tunnels This command has no arguments.
SEE ALSO
ip(8)
AUTHOR
Original Manpage by Michail Litvak <[email protected]>
iproute2 20 Dec 2011 IP-TUNNEL(8)
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