route filtering policies (from "split b" thread)

[dave bernardi]

Dani,

Verio will accept /20 and shorter out of "some" traditional class A space which is the most restrictive we've experienced from the big providers. Sprint says /24 but I've seen longer; and even longer from UUnet and Qwest. 

http://info.us.bb.verio.net/routing.html
http://www.sprintlink.net/policy/bgp_filters.html


Your 64.37.128.0/18 should be fine.

Dave B>


At 10:19 AM 6/5/00 -0700, Hostmaster, Verant wrote:
>Hello.  I'm very interested in learning what are the route filtering
>policies of the larger ISPs.  We're architecting our /18 now, and concerned
>that some of our smaller announcements (/22 or perhaps as small as /24)
>might not get carried throughout the entire Internet.  What I would
>appreciate is that anyone on this list who restricts their learned routes to
>prefixes shorter than /24s please let me know what your policies are.
>
>Is there a standard that most adhere to?  I am reading about "rirs" in
>Randy's below email.. what were rirs' allocation policies?
>
>We've recently discovered one large ISP blocking /23s and /24s from 24.*.*.*
>, since it is a classic class "A".  After a few days of grief, they finally
>realized that since 24.*.*.* had been chopped up and given to cablemodem
>providers, it has announcements that small, and they now will accept as
>small as /24s coming from 24.*.*.*.
>
>Our block is 64.37.128.0/18, and I'm concerned that some old filters that
>were put in place long ago might harm us, in that 64.*.*.* only recently
>started being issued by ARIN, and that technically it is a class "A" block.
>
>----
>Dani D. Roisman
>Verant Interactive
>hostmaster at verant.com
>(310) 840-8753
>
>> -----Original Message-----
>> From: Randy Bush [SMTP:rbush at bainbridge.verio.net]
>> Sent: Monday, June 05, 2000 7:38 AM
>> To:   Tanya Hinman
>> Cc:   arin-discuss at arin.net
>> Subject:      RE: split b
>> 
>> > This allocation was a transfer/merger issue. What policy are you
>> referring
>> > to?
>> 
>> hi tanya (and john),
>> 
>> a number of isps have route filters based on the rirs' allocation
>> policies.
>> 166.49.0.0 is in classic b space, where allocations are on a /16 boundary.
>> our noc received a report of problems reaching the two /17s now being
>> announced.  i am trying to determine if arin has changed its allocation
>> policy in part of the classic b space, in which case we would change our
>> filters.  i gather not.
>> 
>> randy 

--
Dave Bernardi