GTE and ATT both filter via access lists on the customers CPE routers IF they provide the routers to the customer

-----Original Message----- From: Jared Mauch [SMTP:jared@puck.nether.net] Sent: Tuesday, January 12, 1999 12:31 PM To: nanog@merit.edu Subject: source filtering

I'm interested in what providers actually do source filtering of their customers.

Including:

1) Using access-lists to filter your customers 2) Using the "ip verifiy unicast reverse-path" Cisco feature (it's in 11.1CC images when you use CEF, so I don't get a flood of e-mails) 3) Using other router vendors and features you have to filter source addresses.

I'd like to summarize this all and start a quest to fix providers that don't source filter (as people quest against spam, and against smurfable network blocks).

jared

-- Jared Mauch | pgp key available via finger from jared@puck.nether.net clue++; | http://puck.nether.net/~jared/ My statements are only mine.