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SubjectRe: Evil TCPD? (Was: Re: UseNet Gateway One Way ok?)
On Mon, 26 May 1997, Ricky Beam wrote:

> This brings me to an interesting point...
> We need a tcp-wrapper solution half in/half out of the kernel. Why you
> say? Well, if the kernel has the tcpd controlls or tcpd can get high enough
> in the IP stack then it can do all sorts of evil IP level tricks:
> - Block the connection all together (silently drop the syn)
> (ICMP dest unreachable)

Can't you do that with ipfwadm -I -a (deny|reject)?

> - Intentionally drop packets... (give them _less_ than UDP priority)
> ("He's sending packets too fast... drop 'em")

This may keep their system busy, but it won't do a lot of good for your
net connection either.

> - Artifically reduce the throughput...

Can this be done with the shaper patches?

BGP "accidents" with bogus as paths might be interesting too.

Jon Lewis <> | Unsolicited commercial e-mail will
Network Administrator | be proof-read for $199/message.
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