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 ] [ [no]ignore-df ] [ [no]allow-
localremote ]
[ 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 }
tunnel objects are tunnels, encapsulating packets in IP packets
and then sending them over the IP infrastructure. 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.
local ADDRESS
set the fixed local address for tunneled packets.
It must be an address on another interface of this
host.
ttl N
hoplimit N
set a fixed TTL (IPv4) or hoplimit (IPv6) 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 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.
ignore-df
enable IPv4 DF suppression on this tunnel.
Normally datagrams that exceed the MTU will be
fragmented; the presence of the DF flag inhibits
this, resulting instead in an ICMP Unreachable
(Fragmentation Required) message. Enabling this
attribute causes the DF flag to be ignored.
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.
encaplimit ELIM
( only IPv6 tunnels ) set a fixed encapsulation
limit. Default is 4.
flowlabel FLOWLABEL
( only IPv6 tunnels ) set a fixed flowlabel.
allow-localremote
( only IPv6 tunnels ) allow remote endpoint on the
local host.
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.
