Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

When do IP's show up in the SHOW ARP command?

Posted on 2008-10-22
7
Medium Priority
?
1,614 Views
Last Modified: 2008-10-22
I do not fully understand when an IP address will show up in the output of the SHOW ARP command.  For example, I have a VLAN on my CISCO 4006 Switch and I know there 4 dell PC's are connected to it.  I thought that the IP's for those PC's would show up in the output of a SHOW ARP command so I could then get the MAC addresses of those PC's, run a SHOW MAC ADDRESS command, and find the port they are connected to.  However, even though these PC's have been connected for quite some time, their IP addresses do not appear when I run a SHOW ARP command.  
0
Comment
Question by:frank_nye
  • 3
  • 2
  • 2
7 Comments
 
LVL 20

Accepted Solution

by:
RPPreacher earned 200 total points
ID: 22775831
When something makes an ARP request to them.

Just ping each PC, the switch should populate the ARP table.
0
 
LVL 7

Expert Comment

by:knightfox
ID: 22775847
that correct.. you should be able to do a show arp.  Could you please try and ping one of the IP addresses then run:

Router#sh ip arp
Internet  x.x.x.x             -   000b.fc48.xxx  ARPA   Vlanxxx
Internet  x.x.x.x             -   000b.fc48.xxx  ARPA   Vlanxxx
Internet  x.x.x.x             -   000b.fc48.xxxx  ARPA   Vlanxxx
Internet  x.x.x.x             -   000b.fc48.xxx  ARPA   Vlanxxx

/Fox

0
 
LVL 7

Expert Comment

by:knightfox
ID: 22775864
then to show the port do:

Router#sh mac-address table | i xxxx

xxx is the last four chars of the mac address... and you should see

 xxx    0000.0c07.xxx    DYNAMIC    Gi0/1

/Fox
0
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 

Author Comment

by:frank_nye
ID: 22775947
If I do a PING command while in ENABLE mode on the switch, does it start a ping and continually run it or does it just send out a few pings and then stop?  On some devices (I think some test equipment like a Fluke Etherscope) I have seen a PING request go out and then it just keeps on running and runing.  I want to make sure I don't start something like that on the Switch.  If I just run the command PING 10.0.4.20 on the switch, will it only send out a few pings?
0
 
LVL 20

Expert Comment

by:RPPreacher
ID: 22775967
5 pings.
0
 
LVL 7

Expert Comment

by:knightfox
ID: 22775990
you can do it either ping.. and enter the number of pings you want.. or just use ping x.x.x.x and use

CTRL + Shift + 6 to escape the ping

/Fox
0
 

Author Comment

by:frank_nye
ID: 22776155
Thanks everyone.  I got it.
0

Featured Post

Ready for your healthcare security check-up?

In the past few years, healthcare organizations have become a prime target for advanced attacks. Does your organization have what it needs to defend itself? Schedule your healthcare security check-up today and download our free Healthcare Security Resource Kit today!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article will step through configuring a SonicWALL appliance to utilize an internal DHCP server for Global VPN Client (GVC) hosts.  There are times when using an external (external to the SonicWALL) DHCP server, such as Windows Servers, isn’t pr…
This article is a how to to configure a UCS Ethernet-uplink portchannel via the console. It is easy to do and can be done quite quickly. In certain versions of the UCS manager the portchannel has issues coming up and this is a workaround. I am…
Video by: ITPro.TV
In this episode Don builds upon the troubleshooting techniques by demonstrating how to properly monitor a vSphere deployment to detect problems before they occur. He begins the show using tools found within the vSphere suite as ends the show demonst…
This video shows how to quickly and easily deploy an email signature for all users in Office 365 and prevent it from being added to replies and forwards. (the resulting signature is applied on the server level in Exchange Online) The email signat…
Suggested Courses

886 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question