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 <[email protected]> On Behalf Of Brandon Price
Sent: Wednesday, January 15, 2020 9:01 PM
To: nanog list <[email protected]>
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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