Where to buy Internet IP addresses

Mon May 4 08:31:10 UTC 2009

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.

> These are weird topologies, sure, but coming up with some algorithm to handle 
> some of them and not others is going to be too complicated, and leave some 
> people without a workable solution.

This is where innovation will happen in the home market, but only if we 
hand them a /56 to start with.

> 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.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se