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Re: NAP/ISP Saturation WAS: Re: Exchanges that matter...
- From: David Schwartz
- Date: Fri Dec 20 17:29:39 1996
> 3) Deal with it legally. This is what the telco's do. It implies that we
> would need real mechanisms for tracking down offenders.
Personally, I'd like to see a protocol that allows you to ask a
router to which you were directly connected to stamp an interface ID on
all incoming packets bound for a particular network. You could then trace
back router by router, interface by interface, where the packets were
entering a block of cooperating providers.
Thus if I saw an incoming flood of SYN packets or ICMP echoes
with forged origin addresses, I could ask my router to ask all its direct
peers to begin stamping interface numbers (and/or interface IPs) on the
packets they send to me. My router would eat those numbers/IPs so traffic
would appear unaffected.
Then my tracing tool would know which interface the packets were
coming in on and could ask that router to do the same thing (on a
hop-by-hop basis for security reasons). Thus I could track it back to a
specific enough interface path that perhaps an automated method to
install a filter would be sufficient.
This stuff needs a lot of work, but might be a direction that
would both facilitate emergency filtering and effective tracing for IP
packets with forged origin addresses -- assuming the packets have enough
in common to allow them to be detected (all pings, or heavy load, or all
to same destination IP).
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