Adding on to the question...
1) If a /24 is not acceptable, does the acceptable range start at /21 or /23
or?
Here is what I believe is doable - but you need your providers to co-operate
along:-
1) Get a /? from your provider, ensure they allow you to advertise a more
specific route for the portion of their address space assigned to you. Then
re-advertise this to your other providers (from what Howard say, it can't be
a /24 so I'm wondering what's the minimum as per question above). You will
need your own ASN.
2) Use a single provider, multi-homed BGP, and advertise the specific
networks with the no-export community. Your provider will learn multiple
routes to you via BGP but will not re-advertise them. Since you are using a
portion of your provider's address space, it is already being advertised as
a larger aggregate route so the rest of the Internet knows how to route to
you via your provider. You can use private ASN space (get a private ASN
number from your provider) for this.
The 2nd option would alleviate the headaches of trying to get your own
addresses and ASN but limits you to one provider.
Any thoughts?
Regards,
Adrian
""John Deatherage"" <[EMAIL PROTECTED]> wrote in message
005601c01128$a2c11220$9a0419d1@johnm">news:005601c01128$a2c11220$9a0419d1@johnm...
> Does anyone know where I can find good whitepapers or configuration
examples
> of BGP in multi-homed environments? ARIN won't give out anything less
than
> a /21, but some providers won't advertise networks unless the IPs belong
to
> you. Just another situation where politics are as much of a part of an
> engineer's job as everything else. Good thing we have VPs to slam
providers
> <cough> Level 3 <cough>
>
> I've checked the archives and read recent posts by Howard Berkowitz
(looking
> forward to the whitepaper on Sept. 1st). Any other ideas???
>
> This paragraph from Howard basically sums up what I'm discovering:
>
> Depends on the policy of the particular ISP, even tier 1. Some
> simply don't want to advertise any /24 that's not part of their
> address space, some won't do it except for direct customers who have
> negotiated to advertise provider-independent address space, some
> might not be willing to negotiate to advertise an a more-specific
> assignment of another provider's space, and some don't care.
>
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