Messages in this thread | | | Date | Fri, 16 Apr 1999 08:44:07 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: Linux ping flood on localhost |
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On Fri, 16 Apr 1999, Tigran Aivazian wrote:
> Hi, > > You said: > > >Ummm, If I remember correctly it was a bug in the ping program itself and > > not in the kernel. > > Just upgrade your version of ping. > > Yes, we know it is an FAQ and everybody knows the correct answer "get the > latest ping" but, even the best Linux distributions (you know who you > are!) still come with the ping(8) that says 95% packet loss on lo. > > Hope they take notice of this and correct their behaviour (while they are > at it I hope they also trim down the /etc/rc.d/rc.sysinit file which I > always have to manually shorten (by almost an order of magnitude)). >
I think the latest ping will produce 90% packet loss on a flood to localhost. This was some kind of 'feature' (a side-effect) introduced around 2.2.x (Alan responded to this). As I understand it, ICMP replies are delayed by a HZ, so the maximum response-rate is 100/second. Ping flood tries 1000/second so you lose the flood-game.
Cheers, Dick Johnson ***** FILE SYSTEM WAS MODIFIED ***** Penguin : Linux version 2.2.5 on an i686 machine (400.59 BogoMips). Warning : It's hard to remain at the trailing edge of technology.
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