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Home > Forums > Communications Rack > Networking > Cisco: Switches Forum

How to get the IP address if there's no console access?

thread558-1590454
Read More Threads Like This One
hummer3331973 (TechnicalUser)
9 Feb 10 21:09
Hi-

I have this device that we're trying to get in to. We neither have its console nor telnet password. I tried to mirror the port on the switch and hoping it will send-out Broadcast and show on my Wireshark its IP add. But we can't get any even if we recycle the power.

Any suggestion? Unfortuantely it doesn't have any "reset" button or that ROM option on Cisco devices.

Thanks.
North323 (TechnicalUser)
10 Feb 10 9:44
you can get a program that sweeps all IPs in the subnet.  i cant remember the name (ping sweep maybe).  if you physically have the device you can use password recovery (cisco) also
burtsbees (Programmer)
10 Feb 10 9:52
North---you may be thinking of something like Angry IP Scanner (free)...

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

North323 (TechnicalUser)
10 Feb 10 10:08
yea that angry IP...it works good
hummer3331973 (TechnicalUser)
10 Feb 10 14:10
Thanks for the inputs.

Have tried using an IP scanner before, but isn't it you at least know which subnet? I tried the most common being used by most devices 192.168.0.0/24 but no replies.

This is a fairly old unit, and have no idea where it was used before.

 
burtsbees (Programmer)
10 Feb 10 16:28
You can set a computer up with an ip add of 0.0.0.0 with a mask of 0.0.0.0, then connect to the switch, and start Angry IP Scanner at subnet 0.0.0.0 and end at 192.168.255.254

Let it run for 2 days...lol

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

imbadatthis (TechnicalUser)
11 Feb 10 11:04
im just going to throw this out here...
if you have a switch , can't you just connect to the router, wait a bit and issue a show cdp neig det command ?

 
lerdalt (MIS)
11 Feb 10 11:21
or even get the mac address from the switch and do a show arp
ISPKing (ISP)
11 Feb 10 11:44
Wont have an arp entry unless it is contacted at layer 3 first Which he cant do. If it really has an ip address, wireshark it again and wait for the gratuitous arp request.

CCNP

Cluebird (Instructor)
16 Feb 10 0:27
sho cdp nei det or sh cdp entry * will give IP information
Cluebird (Instructor)
16 Feb 10 8:38
Why not just do a password recovery?  
hummer3331973 (TechnicalUser)
16 Feb 10 15:12
Thanks for all the inputs. It will be a lot easier if this is a Cisco, but it is not.

I finally found the culprit. ISPKing is correct, the reason it is not appearing on Wireshark is the IP add disappeared on Fast-E interface for some reasons. Will be sending it to the vendor for repair.
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