Routing Policy and http://rs.arin.net/ip-allocation.html

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1

For the first time we have had to deal with Sprint's routing policy as
defined by http://www.sprint.net/filter.htm. Here is the situation.

One of our dialup customers wants to access his website in the
206.116.31.0/24 network at another provider. PSI is advertising it as a
/24. According to Sprint's routing policy, they do not honour anything
longer than a /19 in 206.0.0.0/8 .

It's interesting that PSI routes it at all. While IP ownership (note the
NON-PORTABLE below) and routing aren't necessarily interconnected, I
suggest contacting the block's owner and seeing if they know it's
alternately routed. If they wish, they can request that PSI un-route this
block. However, that would break whomever is using it. The user should
re-number into PSI space, and this issue will go away. If the user is
multi-homed, they should investigate the adivisibility of getting a CIDR
block which they can announce as an aggregate.

My $0.02

2

[snip]

PSI bought iSTAR earlier this year, so it's not really surprising that
they're routing these networks.

Bryan

3

The ISP-CACHING list is a non-moderated Email discussion designed
to focus its discussion 100% on caching systems, whether they be
Squid type software, proxy server solutions, the new satellite caching
systems, or any new caching system that has yet to be released.

ISP-CACHING is not owned by any equipment or caching vendor, which
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Enjoy,
-Chris

4

Anyways to address the actual question:

I haven't dealt with anyone other than Sprint filtering space longer than
/19 in the 206.0.0.0/8 but in the past I had issues with both UUnet and
Agis filtering errant /24's and /23's out of 204.0.0.0/8.

I've been very clearly telling all my customers that while I will route
their IP space for them, as long as its allocated to them - I will not be
responsible for anything that we know Sprint may or may not filter on any
given day. It generally works well, they take space from me and we
resubmit their space to whomever the governing body is/was at the time.

For customers that really have a need we push as hard as we can to get
them their own /19 so they'll not have to renumber but we know the issues
involved with this.

jlw