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SubjectRe: netfilter plugin: antispoof
On 1999-09-13T21:39:05,
Rik van Riel <riel@humbolt.geo.uu.nl> said:

> Basically, it terminates IP connections that it doesn't
> know of. This makes pretty sure that people trying to
> do IP spoofing (because they're along the path) get their
> connections terminated immediately because the victim
> machine hasn't done the negotiations itself.

How is this different from basic stateful packet filtering, which Netfilter
should already be able to do?

> I don't know how quickly a connection can be terminated
> or how effective this measure could be, but a FIN/FINACK
> combo shouldn't be too hard, now should it?

Just send a port / destination unreachable.

Sincerely,
Lars Marowsky-Brée

--
Lars Marowsky-Brée
Network Management

teuto.net Netzdienste GmbH

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