Re: ISPs whinging about BBC's iPlayer


"stephen" <stephen_hope@xxxxxxxxxxxx> wrote in message
news:RRtMj.7398$B83.1601@xxxxxxxxxxxxxxxxxxxxxxx
: "Cork Soaker" <ISawYourMotherLast@xxxxxxxxxxxxx> wrote in message
: news:fttel8$ggl$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
: >
: >
: > : The main advantage of that though is the system is much simpler and
: > : cheaper. Imaging having hundreds of cross country routes, meaning
miles
: > : and miles more track. How much extra is all that going to cost to
: > : maintain, and how much more complex is planning a route between two
: > : locations. The wider Internet is already seeing some pain at the
growth
: > : of the routing table, with many routers now being unable to cope, and
: > : this is with just 250k routes - how's BT's system going to work with
: > : millions of routes (one per ADSL user).
: >
: > IPv6. This is what it was designed to achieve.
:
: no.
:
: IPv6 solves the issue of number of addresses (although that isnt relevant
to
: this anyway).

It also solves routing problems as IPv6 address are heirarchical - the way
IPv4 was supposed to be, but it failed because registries were just throwing
IPs anywhere to make up for the shortfall.

This is why one node on a network has several different IPv6 addresses, for
each network.

:
: but a different (related) problem is how to build a router which can cope
: with say 100 times the current Internet routing table (not far off
1,000,000
: routes for a router that doesnt use defaults to ignore chunks of the total
: routes around).

IPv6, being heirarchical only needs to know where the network is, not every
IP within the network or internetwork.
The next router knows the next part of the network, and the next router
knows the next part. This is part of the IPv6 standard and was designed to
alleviated the problem of table overflow. Not cure it though, obviously.

:
: the fix so far has been address aggregation, where a router only needs
: detailed info about "local" routes, and less and less about more distant
: routes.
:
: "distance" in this case usually means crossing the boundary to another
: address management domain - in this context that is a different ISP.
:
: and so yes - building an arbitary partial mesh between all the ISPs at an
: exchange and their interfaces and exchanging routes in a meaningful way
to
: handle "short circuiting" local traffic is another can of worms.
:
: Oh - and did i mention all those ISPs get charged for backhaul - so they
are
: going to want to make sure other ISPs dont dump "their" traffic out of the
: exchange onto them and avoid BT use charges.........

That's up to the routing table and encapsulation - this already happens on
many networks.

:
: Ironically BT have been talking about doing more or less this for
multicast
: on 21CN (to support real time streaming) - 21CN is their new replacement
for
: voice and broadband on 1 network, and it gives them a chance to tinker
with
: design.

We'll see how well they do it, and how long it takes them!


.

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