Shim6, was: Re: filtering /48 is going to be necessary

Tue Mar 13 13:03:39 UTC 2012

Ryan Malayter wrote:

>> If the number of routes in DFZ is, say, 100, many routers and
>> hosts will be default free
> 
> For quite some time, a sub-$2000 PC running Linux/BSD has been able to
> cope with DFZ table sizes and handle enough packets per second to
> saturate two or more if the prevalent LAN interfaces of the day.

What if, you run windows?

> The reason current routers in the core are so expensive is because of
> the 40 gigabit interfaces, custom ASICs to handle billions of PPS,
> esoteric features, and lack of competition.

The point of

	http://bill.herrin.us/network/bgpcost.html

was that routers are more expensive because of bloated routing
table.

If you deny it, you must deny its conclusion.

> The fact that long-haul fiber is very expensive to run limits the
> number of DFZ routers more than anything else.

Given that global routing table is bloated because of site
multihoming, where the site uses multiple ISPs within a city,
costs of long-haul fiber is irrelevant.

> Why not take a default
> route and simplify life when you're at the end of a single coax link?

That's fine.

> If your lucky enough to have access to fiber from multiple providers,
> the cost of a router which can handle a full table is not a major
> concern compared with your monthly recurring charges.

As it costs less than $100 per month to have fiber from a
local ISP, having them from multiple ISPs costs a lot less
is negligible compared to having routers with a so bloated
routing table.

						Masataka Ohta