nanog mailing list archives
Re: Where to buy Internet IP addresses
From: Nathan Ward <nanog () daork net>
Date: Mon, 4 May 2009 21:20:15 +1200
On 4/05/2009, at 8:31 PM, Mikael Abrahamsson wrote:
On Mon, 4 May 2009, Nathan Ward wrote:I think that they have to be forwarded. What do you do if people chain three routers? How does your actual CPE know to dish out a / 60 and not a /64 or something? What if someone chains four? What if someone puts three devices behind the second?This is a CPE problem, the main homegateway can decide to dish out / 64s to all other home routers, this means they can have a bunch. It also means they can't chain 3 in serial, unless the home user decides to hand out /60s to each and only have 3 of them connected to the main CPE.
That is one way to do it, sure. However it makes things hard for end users, having to figure out how all this stuff fits together. My non technical friends have a enough time with 3.5mm jack to RCA audio cables, but they managed to get a wireless router and plug it in and have it magically work for them.
Forwarding these requests up to the ISP's router and having several PDs per end customer is in my opinion the best way to go.Why is this better? Why do you want to waste your tcam entries like that? A single /56 per customer makes you have the fewest amount of tcam entries in any solution I can imagine. All other solutions require more.
Because it allows the home user to arrange their network however they want, up to 16 subnets, without having to have any knowledge of how things actually work.
I'm sure we can both think of a few ways to make this not cost a whole lot of TCAM entries, either with protocol support, or in internal implementation specific ways.
I can immediately think of two ways that cost no extra TCAM entries. -- Nathan Ward
Current thread:
- Re: Where to buy Internet IP addresses, (continued)
- Re: Where to buy Internet IP addresses Randy Bush (May 03)
- Re: Where to buy Internet IP addresses Nathan Ward (May 03)
- Re: Where to buy Internet IP addresses Ian Mason (May 04)
- Re: Where to buy Internet IP addresses Jay Hennigan (May 04)
- RE: Where to buy Internet IP addresses TJ (May 04)
- RE: Where to buy Internet IP addresses Barry Shein (May 05)
- Re: Where to buy Internet IP addresses Florian Weimer (May 03)
- Re: Where to buy Internet IP addresses Mikael Abrahamsson (May 04)
- Re: Where to buy Internet IP addresses Nathan Ward (May 04)
- Re: Where to buy Internet IP addresses Mikael Abrahamsson (May 04)
- Re: Where to buy Internet IP addresses Nathan Ward (May 04)
- Re: Where to buy Internet IP addresses Mikael Abrahamsson (May 04)
- Re: Where to buy Internet IP addresses bmanning (May 04)
- Re: Where to buy Internet IP addresses Leo Bicknell (May 04)
- Re: Where to buy Internet IP addresses Joe Greco (May 04)
- Re: Where to buy Internet IP addresses Joe Maimon (May 04)
- Re: Where to buy Internet IP addresses Joe Greco (May 04)
- Re: Where to buy Internet IP addresses Bill Stewart (May 04)
- Re: Where to buy Internet IP addresses Stephen Sprunk (May 04)
- Re: Where to buy Internet IP addresses Charles (May 04)
- Re: Where to buy Internet IP addresses Youssef Ghorbal (May 07)