Re: how to find out unknown machine IP ?
From: Tony 'Nicoya' Mantler (nicoya_at_ubb.ca)
Date: 11/24/05
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Date: Thu, 24 Nov 2005 03:05:20 GMT
In article <dm2lce$jp2$02$1@news.t-online.com>,
Walther Mathieu <mathieu.nospam@in4tec.de> wrote:
: Hello,
:
: I know this canīt be too complicated... but I donīt remember:
: How can I find out the IP number of a totally unknown machine?
:
: I got me two SGI servers from the local university recently
: (they would have dumped them otherwise I fear) and both run fine.
:
: (Its a Challenge M and a Origin 200, plastic enclosures worn)
:
: No head on any of them (just servers) - now I have them connected
: to my little SOHO SGI network here, but before I can administer:
:
: How do access these?
:
: Are there utilities within (reach of) IRIX to find out its IP?
: Port scan or something - where to find?
If you have no console access to the systems, you can use a different system and
try some of the following:
If you know what subnet the mystery systems are on, set your known system to an
address on that subnet and do a broadcast ping.
For example:
$ ping -b 192.168.1.255
WARNING: pinging broadcast address
PING 192.168.1.255 (192.168.1.255) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.236 ms
64 bytes from 192.168.1.250: icmp_seq=1 ttl=255 time=0.449 ms (DUP!)
64 bytes from 192.168.1.3: icmp_seq=1 ttl=64 time=0.573 ms (DUP!)
--- 192.168.1.255 ping statistics ---
1 packets transmitted, 1 received, +2 duplicates, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.236/0.419/0.573/0.140 ms
Not all systems will respond to a broadcast ping, though. SGIs generally will.
If you have no idea what subnet the machine is on, you can watch for ARP traffic
when the system brings up the interface using tcpdump or tethereal.
For example:
# tcpdump -n -i eth1 arp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 96 bytes
20:58:53.692369 arp who-has 192.168.1.2 tell 192.168.1.2
20:58:54.173818 arp who-has 192.168.1.2 tell 192.168.1.2
20:58:55.175310 arp who-has 192.168.1.2 tell 192.168.1.2
3 packets captured
6 packets received by filter
0 packets dropped by kernel
# tethereal -n -i eth1 arp
Capturing on eth1
0.000000 xx:xx:xx:xx:xx:xx -> ff:ff:ff:ff:ff:ff ARP Who has 192.168.1.2?
Gratuitous ARP
0.300824 xx:xx:xx:xx:xx:xx -> ff:ff:ff:ff:ff:ff ARP Who has 192.168.1.2?
Gratuitous ARP
1.302485 xx:xx:xx:xx:xx:xx -> ff:ff:ff:ff:ff:ff ARP Who has 192.168.1.2?
Gratuitous ARP
Most systems should send out a few ARP requests like these when they connect to
the network.
Of course, the best solution would just be to wire up a console cable. You'll
need one eventually.
Cheers - Tony 'Nicoya' Mantler :)
-- Tony 'Nicoya' Mantler -- Master of Code-fu -- nicoya@ubb.ca -- http://nicoya.feline.pp.se/ -- http://www.ubb.ca/ --
- Previous message: Steffen M. Boelaars: "Re: how to find out unknown machine IP ?"
- In reply to: Walther Mathieu: "how to find out unknown machine IP ?"
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