On Wed, Oct 10, 2001 at 10:54:03AM +0200, Stephane Bortzmeyer wrote:

...

...

I'm currently in the process of setting up a new border

...

...

recent debate on the above topic got me wondering what

router, and the the best practice

...

...

filtering policy is? Is there one?

I'm interested to see if people filter route anouncements on the basis of registered routes in an Internet Routing Registry. In our area (Europe), the RIPE database typically contains less than half of the routes which are actually announced. I assume it is not better in ARINland.

When I worked at Tiscali (World Online) Denmark, we did prefix filtering on our peers, the results of that can be seen on http://as8807.net/dixirrstats.txt (Though that is old, january this year) I believe that TeleDanmark also still do IRR filtering, and I know of several providers in Denmark who are ready to follow suit as soon as some of the "worst IRR-offenders" have updated their IRR records (which actually has happened already)

If you decide to implement IRR filtering you may want to see how your peers perform in the IRR area by using a small utility, which can be downloaded from http://noc.tele.dk/util.html. This is the utility that was used to produce the stats for Tiscali's router.

Thanks. (Yes, successfully filtering peers wrt IRR sometimes require human interaction - asking peer not up-to-date to become so.) mh

-- Andreas Plesner Jacobsen