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ARIN doesn't like to give out address space in chunks smaller then 32
class C networks (/20) and are trying to get anyone who currently has a
/21 changed over to useing a /20.
this makes it a big headache to run BGP to multiple ISPs
David Lang
On Wed, 12 Apr 2000, Nick Bastin wrote:
> Date: Wed, 12 Apr 2000 18:11:03 -0400
> From: Nick Bastin <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Re: network layout advice needed
>
> >You are trying to use the wrong tools. Yes it is possible
> >to kind of make this work by using round-robin DNS, or DNS
> >servers with really low TTLs that give out the "current"
> >good address, but this is all a hack that will be unreliable.
>
> Absolutely agreed. There are existing systems out there that currently do
> this, but it's not a Good Thing(tm).
>
> >The time tested way to do this is as follows:
>
> There is another option, which is to get both of your upstream ISPs to
> agree on you using a private AS number, and then stripping that AS on your
> route announcements upstream and replacing it with their own. This is
> fairly common for people who can't get PI address space and are multihomed.
>
> >Get an AS number and address space from arin, and then use
> >BGP4 to peer with your ISPs. I believe that zebra
> >http://www.zebra.org) supports BGP4.
>
> GateD will also work to this end, although neither GateD nor Zebra can do
> load balancing if you're on a system that doesn't correctly handle multiple
> default gateways. Last time I tried this, linux couldn't do it, even
> though there was a cryptic kernel option with no documentation that was
> labeled 'Equal Cost Multipath', which is pretty much what you want. I
> didn't spend much time digging through the code, so it actually could be
> possible. YMMV, of course.
>
> >This way you have one constant address space that is
> >reachable through multiple ISPs. You will need to get
> >to the right people within your ISPs to find someone
> >who knows what you are talking about (dialup/DSL support
> >will likely have no idea).
>
> He's probably not going to have any luck getting address space from ARIN,
> and even if he does, there's no guarantee that that address space will be
> routable. Another option is to use RFC 1918 address space internally and
> NAT it at your gateways to the address space that you receive from your
> ISPs (assuming that you can get a large enough block from both ISPs). That
> doens't load balance your connection in any way, but it does allow for
> external hosts to reach all of the hosts within your network, regardless of
> their location. This is an incredible waste of address space, IMO, but it
> has been done.
>
> --
> Nick Bastin
> Software Developer
> OPNET Technologies
> -
> To unsubscribe from this list: send the line "unsubscribe linux-net" in
> the body of a message to [EMAIL PROTECTED]
>
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