Address block problem

[Redisch, Jason]

Dani,
	Many ISP's have IP Space from legacy Class A space.  A check of the
whois database would show that anyone still filtering on /8 on that space is
missing a large portion of the Internet.  A simple call to their POC should
fix any connectivity issues.  

	However, several ISP's choose to filter all address space based on
the ARIN min allocation size for that block.  They feel that they can reach
the entire Internet that way while keeping routing tables on their networks
to a minimum size.  This decision to filter or not is made by each ISP
individually.  In doing so, these ISP's sometimes sacrifice more optimal
paths, but in can still reach the entire Internet.  Announcing /24's for
multihomed customers should work for the portion of the Internet that wants
to listen to them, and the larger aggregate blocks of the upstream can be
used to direct traffic for those ISP's that do filter at the higher bit
boundaries. 

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Jason Redisch                           (V) 720.493.5533 ext 4120 
Virtela Communications                  (F) 720.493.5006
Sr. IP Engineer 




-----Original Message-----
From: Hostmaster, Verant [mailto:hostmaster at verant.com]
Sent: Monday, July 31, 2000 4:35 PM
To: arin-discuss at arin.net
Cc: Hostmaster, Verant
Subject: RE: Address block problem 


Yeah, /24's are fine as long as you're not a recent recipient of address
space, like us.  We have a block from the 64.0.0.0/8 space, but we can't
advertise /24's out of that block because some stick-in-the-mud ISPs out
there still consider them from the "class A" address space, and filter them
out.  

----
Dani Roisman
Verant Interactive
hostmaster at verant.com

> -----Original Message-----
> From:	Bruce Robertson [SMTP:bruce at greatbasin.net]
> Sent:	Monday, July 31, 00 3:20 PM
> To:	Andy Dills
> Cc:	arin-discuss at arin.net
> Subject:	Re: Address block problem 
> 
> > Why do you force multihomed customers to get their own address space?
> You
> > need to be using 8 /24's to get PI space. None of my multihomed
> customers
> > come anywhere near qualifying.
> 
> Hmmm... mine do.  A couple have single /24s from the swamp that I'm
> advertising under protest, but the rest have large blocks.
> 
> -- 
> Bruce Robertson, President/CEO
> +1-775-348-7299
> Great Basin Internet Services, Inc.			fax: +1-775-348-9412
> For PGP key: finger bruce at greatbasin.net
>