Re: more specific routes in today reality
- Date: Wed, 10 Oct 2001 22:16:38 +0200 (CEST)
> > So what are you refering to? Please name examples of your wild claim:
>
> Okay, let's see if i find it:
>
> 192.124.115.0/24 == weblease AG, old address space from pre-ARIN,
> region should be ARIN/USA, is used in DE (okay -- no direct /16 or
> smaller announcement) [...]
Right. Routing is more or less orthogonal to assignment or allocation
policies. There's no general route 192.0.0/8 in the default-free
zone, so one or more providers in the default-free zone stopped
listening to prefixes longer than, say /20, packets from those
providers' customers towards e.g. 192.124.115.0/24 would be dropped on
the floor by the first router along the path which didn't have a
default route.
> [...], but an example of the bad usage in the swamp space.
>
> inetnum: 194.13.111.0 - 194.13.111.255
>
> route-server>sh ip bgp 194.13.111.0/24 shorter-prefixes
> * 194.13.0.0/17 12.123.25.245 0 7018 3549 1103 1103 i
The routes 194.13.111.0/24 and 194.13.0.0/17 have different origin
ASes, 1103 and 5409, respectively. My guess is that the originator of
the 194.13.0.0/17 prefix is being a Good Guy, since he probably
figures that he has the majority of the address space covered by that
prefix, he originates that single /17 route instead of deaggregating
to cover the exact address space he has allocated locally. If that
/24 route should vanish from the network, traffic towards that prefix
would be sent in the direction indicated by the enclosing /17, but
there is in all probability no connectivity between the two networks,
so the traffic would be dropped on the floor when it came within the
zone of the /17-originators network (but the /24 route is gone,
possibly due to an outage, so who cares?).
And your point was what, again?
Regards,
- Håvard
