ip-sr8
Ipv6 segment routing management
Usage
ip sr
{COMMAND | help}
ip sr
hmac
show
ip sr
hmac
set
KEYID
ALGO
ip sr
tunsrc
show
ip sr
tunsrc
set
ADDRESS
Overview
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 algorithm and secret, and the IPv6 address to use as source for encapsulated packets.
The ip sr hmac set command prompts for a newline-terminated "passphrase" that will be used as the HMAC secret for the corresponding key ID. This "passphrase" is not stretched, and it is used directly as the HMAC key. Therefore it must have enough entropy to be used as a key. For example, a correct use would be to use a passphrase that was generated using head -c 32 /dev/random | base64 -w 0.
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 recommended 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
# ip sr tunsrc set 2001:db8::1
Releases
5 releases since Debian 10 (Buster); the text changed 1 time.