Re: IPv6 Prefix Delegation to customers.

[Jared Mauch <jared () puck nether net>]

Arista/Cisco have commands like this:

ipv6 dhcp relay install routes

You place on the interface to make this happen.

- Jared


> On Jan 16, 2020, at 11:27 AM, Chris Gross <CGross () ninestarconnect com> wrote:
>
> In my environment I’ve been running Kea dhcp6 against Ciscos of varying platform (7600, ASR920, etc) and just them as 
> a relay. In this case, the Cisco itself is installing a route as it snoops the relay action automatically. This was 
> one of the harder things to wrap my head around before just slapping it in to see what happened and bam, routes. 
> Router gets a WAN IP from the loopback via DHCPv6 as well, then gets PD assigned after.
>
> interface Loopback10
> vrf forwarding CGNAT
> no ip address
> ipv6 address 2001:DB8::1/64
> !
> interface VlanXXXX
> vrf forwarding CGNAT
> ip address 100.64.Y.Z 255.255.252.0
> ip helper-address global 10.0.Y.Z
> ip helper-address global 10.0.Y.Z
> ip flow ingress
> load-interval 30
> ipv6 address FE80::1 link-local
> ipv6 enable
> ipv6 nd router-preference High
> ipv6 dhcp relay destination 2001:DB8:0:A::BEEF source-address 2001:DB8:YZ01::1
> ipv6 dhcp relay destination 2001:DB8:0:B::BEEF source-address 2001:DB8:YZ01::1
>
> S   2001:DB8:YZ00:3F00::/56 [1/0]
>      via FE80::4665:7FFF:FE14:EDC2, VlanXXXX
>  
> Chris Gross
> Network Architect
>  
> From: NANOG <nanog-bounces () nanog org> On Behalf Of Brandon Price
> Sent: Wednesday, January 15, 2020 9:01 PM
> To: nanog list <nanog () nanog org>
> Subject: IPv6 Prefix Delegation to customers.
>  
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>  
>  
> Hey Nanog,
>  
> I am in the process of building out a FTTH proof of concept, and I would really like to offer each of my customers a 
> /48 of IPv6.
> I’ve been able to announce my /32 to my upstreams, dual-stack all of my internal infrastructure no-problem, build v6 
> recursive name servers, etc.
> This was fairly straight-forward.
>  
> Where I am struggling is the Prefix Delegation part. How are most folks getting the PD subnets into their IGPs? In my 
> environment I don’t run the DHCP server process on the router that is directly connected to the clients. I have seen 
> documentation that cisco and juniper DHCPv6 processes are smart enough to insert that prefix into the routing table 
> when they hand it out, but how is this handled in an environment with a central DHCP server? I do not currently run 
> any PPPOE in my environment and I don’t use RADIUS for the subscriber management. I would really just like to stick 
> to DHCP ideally.
>  
> If anyone has any pointers, I would appreciate it.
>  
> Brandon Price
> Senior Network Engineer
> City of Sherwood, Sherwood Broadband
> Desk: 503.625.4258
> Cell: 971.979.2182
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