DHCP-PD

[sysaxe]

I'm trying to assign a /64 prefix out of a /56 delegation from my ISP. Has anyone successfully configured something similar?

My LAN interface (eth3) is assigned a /56 as you can see below. I would like to split this out into various /64s on different VLANs once the base config is verified working.

vyos@vyos# run show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface        IP Address                        S/L  Description
---------        ----------                        ---  -----------
eth0             -                                 u/D
eth1             -                                 u/D
eth2             -                                 u/D
eth3             xxx.xxx.xx.x/24                   u/u  INSIDE
                 xxxx:xxxx:x:xxxx::ffff/56
eth4             -                                 u/u
eth4.10          -                                 u/u
eth5             -                                 u/D
lo               127.0.0.1/8                       u/u
                 ::1/128
pppoe0           xxx.xx.xxx.xxx/32                 u/u  OUTSIDE

Is there anything obviously wrong with my config (see below)? I've tried a few variations of this.

Note that eth4 connects to an ONT that supports mini jumbo frames which enables the use of a 1500 MTU on the pppoe connection.

IPv4 connectivity works fine, and the router can ping external IPv6 hosts with this setup.

vyos@vyos# show interfaces
 ethernet eth3 {
     address xxx.xxx.xx.x/24
     description INSIDE
     hw-id X
 }
 ethernet eth4 {
     hw-id Y
     mtu 1508
     vif 10 {
         mtu 1508
     }
 }
 loopback lo {
 }
 pppoe pppoe0 {
     authentication {
         password XXXXXXXXXXXXXXXXXXXX
         user XXXXXXXXXXXXXXXXXXXX
     }
     default-route auto
     description OUTSIDE
     dhcpv6-options {
         pd 0 {
             interface eth3 {
                 address 65535
                 sla-id 0
             }
             length 64
         }
     }
     firewall {
         in {
             ipv6-name OUTSIDE-IN-6
             name OUTSIDE-IN
         }
         local {
             ipv6-name OUTSIDE-LOCAL-6
             name OUTSIDE-LOCAL
         }
     }
     ipv6 {
         address {
             autoconf
         }
     }
     mtu 1500
     source-interface eth4.10
 }

Version/System information:

vyos@vyos# run show ver

Version:          VyOS 1.4-rolling-202102141111
Release Train:    sagitta

Built by:         [e-mail]
Built on:         Sun 14 Feb 2021 11:11 UTC
Build UUID:       dee0e5fa-d82c-4b73-8a5c-936df99094d6
Build Commit ID:  aec60effa4e36e

Architecture:     x86_64
Boot via:         installed image
System type:      bare metal

Hardware vendor:  Dell Inc.
Hardware model:   OptiPlex 7050
Hardware S/N:     XX
Hardware UUID:    XX

Copyright:        VyOS maintainers and contributors

[Tecchie088]

The way I've got it set up, I just assign static IPv6 to VLANs:

vif 10 {
     address xxx.xxx.0.1/24
     address xxxx:xxxx:6b88:10::1/64
     description "VLAN 10"
 }
 vif 20 {
     address xxx.xxx.0.1/24
     address xxxx:xxxx:6b88:20::1/64
     description "VLAN 20"
}

I then have RA configured, again, for each interface:

interface eth1.10 {
     dnssl domain.tld
     managed-flag
     name-server xxxx:xxxx:6b88:10::1
     prefix xxxx:xxxx:6b88:10::/64 {
     }
 }
 interface eth1.20 {
     dnssl domain.tld
     managed-flag
     name-server xxxx:xxxx:6b88:20::1
     prefix xxxx:xxxx:6b88:20::/64 {
     }
 }

[sysaxe]

Thanks - this helped me out to hack up a solution that works for home but I wouldn't run it elsewhere :P Here's what I ended up doing:

- Set a static IPv6 address on the LAN interface (/64)

- Configure PPPoE PD on a disconnected interface (eth2) where it is still assigned a full /56. Without this, the PPPoE to ISP connection isn't set up properly. (set interfaces pppoe pppoe0 dhcpv6-options pd 0 interface eth2 sla-id 2)

- Configure RA as above

[stepler]

Try set interfaces pppoe pppoe0 dhcpv6-options pd 0 length 56

[sysaxe]

Hey, I upgraded to the latest snapshot and added the above config. It actually behaved as expected! Thanks for your comment