nanog mailing list archives
Re: Things to do to make the network better
From: Jon Lewis <jlewis () inorganic5 fdt net>
Date: Thu, 8 Jan 1998 23:21:19 -0500 (EST)
On Thu, 8 Jan 1998, Morten Reistad wrote:
We have routers with ISDP PRI links, where the routing information arrives from RADIUS via a CHAP login. There are 600 routed objects in the RADIUS database, as well as 10k+ non-routed (dynamic IP) objects. Every ISDN router therefore has a potential 600 directly attached neighbors; although no router has more than 60 links at any one time. Some common equipment may handle this just barely; other is wholly inadequate.
So if you only have 60 links at a time, it can probably handle 60 really short access-lists. The trick is how to create appropriate filter lists on the fly. People have been requesting "automatic" filters where the access-server unless overridden creates a filter based on the routes it has for a particular interface. Hopefully, they're actually working on this...or at least thinking about it. As an "it's better than nothing" solution, unless you have too many network blocks, you can at least put in your various routers filter lists that allow forwarding of all possibly valid source addresses, but block absolutely bogus ones (i.e. source addresses from networks that are not yours). This would allow some level of spoofing within your own network, but protect the rest of the world. ------------------------------------------------------------------ Jon Lewis <jlewis () fdt net> | Unsolicited commercial e-mail will Network Administrator | be proof-read for $199/message. Florida Digital Turnpike | ______http://inorganic5.fdt.net/~jlewis/pgp for PGP public key____
Current thread:
- Things to do to make the network better Perry E. Metzger (Jan 05)
- Re: Things to do to make the network better Tom Killalea (Jan 05)
- Re: Things to do to make the network better Morten Reistad (Jan 07)
- Re: Things to do to make the network better Jon Lewis (Jan 07)
- Re: Things to do to make the network better Morten Reistad (Jan 08)
- Re: Things to do to make the network better Havard . Eidnes (Jan 08)
- Re: Things to do to make the network better Morten Reistad (Jan 08)
- Re: Things to do to make the network better Havard . Eidnes (Jan 08)
- Re: Things to do to make the network better Morten Reistad (Jan 07)
- Re: Things to do to make the network better Jon Lewis (Jan 08)
- Re: Things to do to make the network better Tom Killalea (Jan 05)
- <Possible follow-ups>
- Re: Things to do to make the network better Owen DeLong (Jan 05)
- Re: Things to do to make the network better Paul A Vixie (Jan 05)
- Re: Things to do to make the network better Perry E. Metzger (Jan 05)
- Re: Things to do to make the network better Pete Ashdown (Jan 05)