Solved

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

Posted on 2008-10-22
7
1,601 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
7 Comments
 
LVL 20

Accepted Solution

by:
RPPreacher earned 50 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
Moving data to the cloud? Find out if you’re ready

Before moving to the cloud, it is important to carefully define your db needs, plan for the migration & understand prod. environment. This wp explains how to define what you need from a cloud provider, plan for the migration & what putting a cloud solution into practice entails.

 

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

Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

Question has a verified solution.

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

This tutorial will go through the steps required to write a script that will back up the configuration settings of a HP-ProCurve switch. You will need to get the following things to follow this tutorial: Telnet Scripting Tool e.g. TST10.exe …
#Citrix #Netscaler #MSSQL #Load Balance
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Suggested Courses

632 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