Re: netcraft && uptime guesses

[The Butlers <tbutler@seascape.ns.ca>]

On Wed, 20 Dec 2000, Tamas TEVESZ wrote:
> On Wed, 20 Dec 2000, dreamwvr wrote:
> 
>  >        They are using ICMP echo request .. disable it in /etc/ipf.rules
> 
> ? ;0
> 
> how can it be done ? ( i mean uptime guessing through icmp, of course,
> not ipfilter basics:)
> 
> -- 
> [-]
> ``And there are plenty of other innovative pieces of software such as Napster
> and ICQ.'' -- comment on ``Systems Software Research is Irrelevant'' at
> http://freshmeat.net/news/2000/08/05/965534399.html

Though I'm not even sure of the program, or if this is correct. I believe it
can be done that way because it sends it the ICMP echo request. If it gets one
back then it's still up. If it ever sends one and there is no reply, then it's
down. Thus you could go down between the requests and come back up before the
next one and they wouldn't know the difference.

  -- Matt