Re: Changes to PI Policy?
- Date: Tue, 22 Apr 2003 20:27:36 +0200
Hi,
On Tue, Apr 22, 2003 at 05:16:46PM +0100, Peter Gradwell wrote:
> >If those customers really only need a /29, why do they need PI space?
> >
> >Unless this question can be answered in a way that's more than "because
> >they want!", I don't see any need to "fix" the policy here.
>
> The justification for address space will always be "I want it because I
> have N computers" and it cannot be possible for a registry to disagree
> with that request.
Of course not. But the request in itself is flawed. I *still* haven't
seen a single good reason for globally routeable /29s (except "they might
want!").
> If the request is "I have N computers which I want to connect to multiple
> providers, but I don't wish to allocate address space to anyone else"
> then PI space is the only (realistic) option.
If the setup is such that a /29 is sufficient address space, other ways
of connecting to multiple ISPs exist that do not require a global routing
table entry.
> If the problem is that
> (a) we have a limited amount of IPv4 address space
> (b) we can also only have a limited number of routes
>
> then we must place them at each end of a set of scales and determine
> the appropriate compromise to make the whole thing balance whilst we
> think of a better solution (bigger routers, caching, etc).
>
> Andre suggests that he could cope with /29 allocations. You prefer /24
> allocations.
No. I said I'm not going to route anything more specific than a /24.
This does NOT mean "everybody has to go for a /24". It could also mean
"re-think what you're asking for".
> Would more /29 allocations cause such routing bloat as to cause a problem?
Every single global route is to be weighted very carefully.
As I said, I have yet to see a reason for a globally visible route if
there are only 5-6 machines in that network. Other approaches exist
for such small networks.
For a /24, with maybe 200 machines in there, renumbering is much more
work, and something can be said for convenience in changing ISPs (but
then, if this is *only* for "Internet surfing", this could very well
be handled by proper planning and preparation - for VPN customer
connections, things are more difficult).
Gert Doering
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