[plug] local DoS with ping -R

[Matt Kemner]

On Mon, 13 Dec 1999, Christian wrote:

> How do people ping flood others using /bin/ping unless they have root
> access? (in which case not being setuid doesn't help.)  There was a bug
> with the signal handling which allowed an effective ping flood but hasn't
> this been fixed?

You can flood somebody's link quite effectively by using
"ping -s <some really big number> <their IP address>"

If you run several such pings from a machine with a suitably large link
(like an ISP's or uni's shell server) then the recipient can kiss goodbye
to their modem link for the duration.

I found many of our online-games-playing customers were using it to cheat,
and it was starting to take up too much of my time chasing them up, so I
disabled the -s flag.

 - Matt(now wondering if I should modify it again so that if they try -s,
        it works out who they are and floods their modem instead :)