nanog mailing list archives
Re: Where to buy Internet IP addresses
From: Jack Bates <jbates () brightok net>
Date: Tue, 05 May 2009 14:49:01 -0500
Mikael Abrahamsson wrote:
Why wouldn't DHCPv6-PD work within the home as well as between the ISP and the home?
DHCPv6-PD requires manual configuration.
I see little reason why the main home gateway can't get a /56 from the ISP, and then hand out /62 (or whatever) to any routers within the home that asks for PD?
Sure, but how does the router know it needs to hand out a /62? Then what about the router after that? Does it hand out a /61? then the router behind that?
What if the ISP only gave a /60?The problem with automatic arbitrary splitting of a prefix into smaller prefixes is that the entire topology is unknown. In such a case, bidirectional communication is useful, as is multiple prefix assignments to a single node generated from chaining DHCPv6-PD requests.
PD is not designed for multiple stage delegations without manual configuration for each stage.
Even the PD clients I tried on linux failed horribly in how they assigned a prefix to the interfaces. One of them just took the prefix length and divided it by the number of interfaces. Another, which I ended up using allowed you to set the bits to use as a subnet, but that meant you had to know the length from the ISP, and then the desired length on each of the interfaces to set the appropriate SLA (ie, I couldn't tell it I want a /64 on the interface, but instead had to tell it the SLA is 4 bits, which from a /60 would give a /64, but if I received a /56 it would break and have to be changed to 8 bits).
-Jack
Current thread:
- Re: Where to buy Internet IP addresses, (continued)
- Re: Where to buy Internet IP addresses Mohacsi Janos (May 05)
- Re: Where to buy Internet IP addresses Joe Maimon (May 05)
- RE: Where to buy Internet IP addresses TJ (May 04)
- Re: Where to buy Internet IP addresses Seth Mattinen (May 04)
- Re: Where to buy Internet IP addresses Mikael Abrahamsson (May 04)
- Re: Where to buy Internet IP addresses Jack Bates (May 04)
- Re: Where to buy Internet IP addresses Joe Maimon (May 05)
- Re: Where to buy Internet IP addresses Joe Greco (May 05)
- Re: Where to buy Internet IP addresses Jack Bates (May 05)
- Re: Where to buy Internet IP addresses Mikael Abrahamsson (May 05)
- Re: Where to buy Internet IP addresses Jack Bates (May 05)
- Re: Where to buy Internet IP addresses Mikael Abrahamsson (May 05)
- DHCPv6 PD David W. Hankins (May 05)
- Re: Where to buy Internet IP addresses Stephen Sprunk (May 05)
- Re: Where to buy Internet IP addresses Carsten Bormann (May 05)
- Re: Where to buy Internet IP addresses Karl Auer (May 05)
- Re: Where to buy Internet IP addresses Mikael Abrahamsson (May 05)
- Re: Where to buy Internet IP addresses Karl Auer (May 05)
- Re: Where to buy Internet IP addresses Jack Bates (May 06)
- Re: Where to buy Internet IP addresses Carsten Bormann (May 06)
- RE: Where to buy Internet IP addresses david.binet (May 06)