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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.

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