# phpman > man > ip-sr(8)

[IP-SR(8)](https://www.chedong.com/phpMan.php/man/IP-SR/8/markdown)                                        Linux                                       [IP-SR(8)](https://www.chedong.com/phpMan.php/man/IP-SR/8/markdown)



## NAME
       ip-sr - IPv6 Segment Routing management

## SYNOPSIS
       **ip** **sr**  { _COMMAND_ | **help** }


### ip sr hmac show

       **ip** **sr** **hmac** **set** _KEYID_ _ALGO_

### ip sr tunsrc show

       **ip** **sr** **tunsrc** **set** _ADDRESS_


## DESCRIPTION
       The **ip** **sr** command is used to configure IPv6 Segment Routing (SRv6) internal parameters.

       Those parameters include the mapping between an HMAC key ID and its associated hashing algo‐
       rithm and secret, and the IPv6 address to use as source for encapsulated packets.

       The **ip** **sr** **hmac** **set** command prompts for a passphrase that will be used as the HMAC secret for
       the corresponding key ID. A blank passphrase removes the mapping.  The currently supported
       algorithms for _ALGO_ are **sha1** and **sha256**.

       If the tunnel source is set to the address :: (which is the default), then an address of the
       egress interface will be selected. As this operation may hinder performances, it is recom‐
       mended to set a non-default address.


## EXAMPLES
### Configure an HMAC mapping for key ID 42 and hashing algorithm SHA-256
       # ip sr hmac set 42 sha256

### Set the tunnel source address to 2001:[db8::1](https://www.chedong.com/phpMan.php/perldoc/db8%3A%3A1/markdown)
       # ip sr tunsrc set 2001:[db8::1](https://www.chedong.com/phpMan.php/perldoc/db8%3A%3A1/markdown)

## SEE ALSO
       [**ip-route**(8)](https://www.chedong.com/phpMan.php/man/ip-route/8/markdown)

## AUTHOR
       David Lebrun <<david.lebrun@uclouvain.be>>



iproute2                                     14 Apr 2017                                    [IP-SR(8)](https://www.chedong.com/phpMan.php/man/IP-SR/8/markdown)