nanog mailing list archives
Re: NSPs and filters (fwd)
From: Jon Lewis <jlewis () inorganic5 fdt net>
Date: Mon, 14 Jul 1997 12:47:17 -0400 (EDT)
On Mon, 14 Jul 1997, Daniel Senie wrote:
And it goes beyond that... Every PC running Windows (or any other OS, for that matter) has complete ability to do anything with IP. So, any user on a dialup line into any ISP is a possible source of attacks.
Not at 1.5mbps :). Granted I've seen effective synflooding come from a dialup customer. Can you say luserdel. I think you can. :)
This is why I think the RAS servers need to be able to filter right at the point of the dialup. There, the comparison is a simple compare of a 32 bit integer (IP address assigned to the dialup user, compared to the IP address of packets received from the user). Any discrepancies should set off alarm bells...
It's mostly that simple, but not entirely. Filters for dialup subnet customers would likely need to make 2 comparisons. ------------------------------------------------------------------ Jon Lewis <jlewis () fdt net> | Unsolicited commercial e-mail will Network Administrator | be proof-read for $199/message. Florida Digital Turnpike | ________Finger jlewis () inorganic5 fdt net for PGP public key_______
Current thread:
- Re: NSPs and filters (fwd) Michael (Jul 12)
- Re: NSPs and filters (fwd) Jon Lewis (Jul 12)
- Re: NSPs and filters (fwd) Sean M. Doran (Jul 14)
- Re: NSPs and filters (fwd) Jon Lewis (Jul 14)
- Re: NSPs and filters (fwd) Daniel Senie (Jul 14)
- Re: NSPs and filters (fwd) Jon Lewis (Jul 14)
- Re: NSPs and filters (fwd) Sean M. Doran (Jul 14)
- Re: NSPs and filters (fwd) Jon Lewis (Jul 12)
- <Possible follow-ups>
- Re: NSPs and filters (fwd) Barney Wolff (Jul 14)