Hallo NG,

a perhaps silly question. If I have two machines connected with a
crossover-cable, both running tcp, but I only have access to one of
them. How can I get the static IP-Address of the other machine?

Thank you for your time and

Florian

In article <58C7E636-CEE6-416F-8A1C-E1A9FB2CA0B5%edv@zschocke-berlin.de>,
Florian Zschocke <edv@zschocke-berlin.de> wrote:
>a perhaps silly question. If I have two machines connected with a
>crossover-cable, both running tcp, but I only have access to one of
>them. How can I get the static IP-Address of the other machine?

In the general case, you cannot. For one thing, it might not have
a static IP address. For another, there is no way to force a computer
to respond if it has been configured to block you.

You could -try- firing off an icmp echo packet to 255.255.255.255
but don't be surprised if nothing answers.

"Walter Roberson" <roberson@hushmail.com> wrote in message
news:mKBQh.22591$6m4.14856@pd7urf1no...
> In article <58C7E636-CEE6-416F-8A1C-E1A9FB2CA0B5%edv@zschocke-berlin.de>,
> Florian Zschocke <edv@zschocke-berlin.de> wrote:
>>a perhaps silly question. If I have two machines connected with a
>>crossover-cable, both running tcp, but I only have access to one of
>>them. How can I get the static IP-Address of the other machine?
>
> In the general case, you cannot. For one thing, it might not have
> a static IP address. For another, there is no way to force a computer
> to respond if it has been configured to block you.
>
> You could -try- firing off an icmp echo packet to 255.255.255.255
> but don't be surprised if nothing answers.

Check the arp table (arp -a). Even if you don't get responses to ping or
other services, you may still get arp entries.

"Scooby" <mmscooby1@earthlink.net> wrote in message
news:OzCQh.20788$Jl.10349@newsread3.news.pas.earth link.net...
> "Walter Roberson" <roberson@hushmail.com> wrote in message
> news:mKBQh.22591$6m4.14856@pd7urf1no...
>> In article <58C7E636-CEE6-416F-8A1C-E1A9FB2CA0B5%edv@zschocke-berlin.de>,
>> Florian Zschocke <edv@zschocke-berlin.de> wrote:
>>>a perhaps silly question. If I have two machines connected with a
>>>crossover-cable, both running tcp, but I only have access to one of
>>>them. How can I get the static IP-Address of the other machine?
>>
>> In the general case, you cannot. For one thing, it might not have
>> a static IP address. For another, there is no way to force a computer
>> to respond if it has been configured to block you.
>>
>> You could -try- firing off an icmp echo packet to 255.255.255.255
>> but don't be surprised if nothing answers.
>
> Check the arp table (arp -a). Even if you don't get responses to ping or
> other services, you may still get arp entries.
>

Oh yea, and if you have a packet sniffer, you can watch for broadcasts from
teh other system which will tell you what the ip of the machine is.

"Scooby" <mmscooby1@earthlink.net> schrieb:

>
> Oh yea, and if you have a packet sniffer, you can watch for broadcasts from
> teh other system which will tell you what the ip of the machine is.
>
Thanks a lot I will try this.

Florian

Florian Zschocke <edv@zschocke-berlin.de> dixit:

> Hallo NG,
>
> a perhaps silly question. If I have two machines connected with a
> crossover-cable, both running tcp, but I only have access to one of
> them. How can I get the static IP-Address of the other machine?

You could install a packet sniffer software, such as Ethereal, and see
where your ARP packets are going to or coming from.

Marcos

On Wed, 04 Apr 2007 07:22:06 +0000, Florian Zschocke wrote:

> "Scooby" <mmscooby1@earthlink.net> schrieb:
>
>
>> Oh yea, and if you have a packet sniffer, you can watch for broadcasts
>> from teh other system which will tell you what the ip of the machine
>> is.
>>
> Thanks a lot I will try this.

Actually, if it's Windows, this is a sure way.

If you can get the other side to reboot, you probably can sniff it's
gratuitous arp. I use that method to find out the address of
accesspoints, wireless bridges, etc when we don't know the IP address.
Works like a charm and saves us a reset to factory default when all we
need is a new IP address.

HTH,
M4