is host exist

How can i test if host exist, when host doesn't response for ping ?

--
pozdr.;)
~xEM

On Sun, 08 Feb 2004 12:07:48 +0000, xEM wrote:

> How can i test if host exist, when host doesn't response for ping ?

If you know what services are running on it (you can scan it with nmap),
you can "ping" a specific port using hping (or rather hping2)

Cheers
Horror Vacui

On 2004-02-08, Horror Vacui <vacuihorror@gmx.net> wrote:
>
> If you know what services are running on it (you can scan it with nmap),
> you can "ping" a specific port using hping (or rather hping2)
>
> Cheers
> Horror Vacui

Yes, that's working :)
So.. when i don't know services... ?

--
pozdr.;)
~xEM

"xEM" <me@o2.pl> wrote in message news:slrnc2c9kn.23p.me@192.168.1.5...
> How can i test if host exist, when host doesn't response for ping ?
>

See if an ARP entry appears for it in /proc/arp


Of course some other machine might answer for it. (how likely is that ? )

Kurt <kurt@noemail.com> wrote:
> "xEM" <me@o2.pl> wrote in message news:slrnc2c9kn.23p.me@192.168.1.5...

>> How can i test if host exist, when host doesn't response for ping ?

> See if an ARP entry appears for it in /proc/arp

> Of course some other machine might answer for it. (how likely is that ? )

A bigger problem is when the machine is in a different subnet. Then you
won't see any ARP requests for that particular machine.

--
Cameron Kerr
cameron.kerr@paradise.net.nz : http://nzgeeks.org/cameron/
Empowered by Perl!

xEM <me@o2.pl> wrote:
> How can i test if host exist, when host doesn't response for ping ?

If you mean the ping is timing out, then the presence of the timeout
should tell you that the host is not responding (or is dropping your
ping packets).

Using a UDP ping may be useful also.

Otherwise, your kinda screwed (unless the host is in the some subnet, in
which case you can solicit an ARP request (ping -c1 IP &))

--
Cameron Kerr
cameron.kerr@paradise.net.nz : http://nzgeeks.org/cameron/
Empowered by Perl!

"xEM" <me@o2.pl> a écrit dans le message de
news:slrnc2dhd1.ib.me@192.168.1.5...
> On 2004-02-08, Horror Vacui <vacuihorror@gmx.net> wrote:

>
> Yes, that's working :)
> So.. when i don't know services... ?
>
> --
> pozdr.;)
> ~xEM

With nmap, you can scan the open ports :

nmap -sT adress

On Mon, 09 Feb 2004 11:00:19 +0000, tibo wrote:

> nmap -sT adress

ITYM 'nmap -sT -P0 host.name.or.ip' -- nmap normally tries to ping the
host first.

--
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but there are far too many nonsense-spouting anarchists or idiots who
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