Question

Resolve mac address or IP address to a hostname/ DHCP

Asked by: JohnRamz

Cisco 3845 router

I have a DHCP server configured in Cisco router for a remote office. The clients connect thru the switch-router and authenticate to our main office connected with a MPLS circuit.

Whenever there is a traffic congestion I am able to pinpoint in that office with IP address, Mac Address and switch port of the host that is causing trouble. Since I do not have a DNS server in that office I cannot know the host name. is there anyway to get that info without having to set a DNS server in that location?

Thanks

John

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Asked On
2009-08-03 at 15:21:22ID24623024
Topic

Network Routers

Participating Experts
3
Points
500
Comments
11

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Answers

 

by: alanhardistyPosted on 2009-08-03 at 15:34:11ID: 25009196

I use a tool called NetScan.exe which is a free download that can identify IP addresses and host names.

If you can get to te environment and can run the software it will allow you to identify the PC causing the fun!

http://www.download3k.com/Install-SoftPerfect-Network-Scanner.html

 

by: alanhardistyPosted on 2009-08-03 at 15:35:00ID: 25009199

It's the football looking icon - no idea why!

SoftPerfect Network Scanner 4.2.2

 

by: memo_tntPosted on 2009-08-03 at 15:50:36ID: 25009264

hi

if you didnt use software as in the ubove posts, you can use the ARP command in cisco

#sh arp >>> will show IPs with its consistent MAC addresses

and to clear ARP-cache

#clear arp-cache

you can create a list with hostnames and its consistent MACs

and by this simple way you can get hostnames

BR

 

by: JohnRamzPosted on 2009-08-03 at 16:32:48ID: 25009442

Memo_tnt,

How do I create that list? in the router or the switch?

Please give detail

 

by: memo_tntPosted on 2009-08-03 at 17:11:02ID: 25009575

hi

if your PCs have static IPs,, then use ..ip hos command

ip host
To define a static host name-to-address mapping in the host cache, use the ip host global configuration command. To remove the name-to-address mapping, use the no form of this command.
ip host name [tcp-port-number] address1 [address2...address8]
no ip host name address1 name Name of the host. The first character can be either a letter or a number. If you use a number, the operations you can perform are limited. tcp-port-number (Optional) TCP port number to connect to when using the defined host name in conjunction with an EXEC connect or Telnet command. The default is Telnet (port 23). address1 Associated IP address. address2...address8 (Optional) Additional associated IP address. You can bind up to eight addresses to a host name.  

but ,, as per your post,, your pcs get IP dynamically not static

so, may you can make a manual list by writing down MAC address and its hostname .. not through Cisco commands ... hand typing ..

BR

 

by: ikalmarPosted on 2009-08-03 at 21:33:49ID: 25010614

Hi

You able to view the dhcp table on the router:

sh ip dhcp brief
that shows the assigned mac-address!

 

by: JohnRamzPosted on 2009-09-29 at 03:26:25ID: 25447392

Ikalmar,

I know that. But it does not show me the host name.

 

by: alanhardistyPosted on 2009-09-29 at 03:38:49ID: 25447455

Have you tried using the software I suggested?

 

by: alanhardistyPosted on 2009-09-29 at 03:40:16ID: 25447465

The software shows the IP Address, Hostname, MAC address, Response Time, Ports Open, SNMP and Logged on user.

 

by: ikalmarPosted on 2009-09-29 at 03:41:33ID: 25447478

if there is no DNS server you only find it with netbios names, please browse windows networks, and you able to know which PC-s connected which address

 

by: JohnRamzPosted on 2009-10-14 at 18:54:04ID: 31611196

partial answer

20120131-EE-VQP-002

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