North American Network Operators Group|
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Re: NSPs and filters (fwd)
Sean M. Doran wrote: > > Jon Lewis <email@example.com> writes: > > > Unless I'm mistaken, forged UDP requires root access and (at the volume we > > received) was likely from a host with T1 or better > > connection to the net. > > You just described nearly every PeeCee at nearly every > higher educational institution in North America and > northern Europe, and several parts of Asia, too. 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. 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...