Splitting a block of Class C's

Andy andy at tigerteam.net
Fri May 25 01:13:45 UTC 2001

On Thu, 24 May 2001, Albert Meyer wrote:

> At 07:39 PM 5/24/01 -0500, Andy wrote:
> >It really depends on what you *want* to do. If the /24's you have assigned
> >to them are non-contiguous then they will want to renumber anyway so they
> >can advertise an aggregate. If you want to help them out, tell them to go
> >ahead and advertise the /24's out of your aggregate. Some providers have
> >stricter filtering, but generally will be reachable through other
> >providers, so connectivity isn't a big deal. Sprint should be advertising
> >an aggregate of your IP space which will bring all traffic to their
> >network. Once it reaches Sprint's network, the more specific routes your
> >customer is advertising will go to them and the rest will come to you. I
> >can't see that this would add any additional load to your router.
> >
> >andy

> It may not be that simple.

It never is.

> I guess I should have mentioned that I don't 
> route anything through Sprint. The only reason I've kept the Sprint circuit 
> is to avoid re-IP-ing. Sprint isn't reliable enough to carry customer 
> traffic. I do advertise the Sprint route, but I add a couple of hops to 
> make sure the traffic goes through my "real" circuit.

I don't think the above details should affect your situation. Your traffic
will get to you the way it usually does while the more specifics will be
routed through Sprint's network to your customer. Just because you pad
your ascount doesn't change my response.


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