?
Solved

Is frequent ARPing normal?

Posted on 2004-08-11
11
Medium Priority
?
431 Views
Last Modified: 2010-04-08
I have a network where clients randomly drop their internet connection behind a cisco pix 501.   Random clients randomly drop their connection for random periods of time.  I'm not sure yet if it is a switch or the firewall.   I am guessing it is the firewall..  Anyway, I am doing some arp debugging on the pix and i notice it keeps rearping the same clients.. should it be doing this?  It will arp the same clients sometimes 5-10 times in minute.. shouldnt it cache the arp and be done with it?


0
Comment
Question by:Brent92663
[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
  • 6
  • 3
11 Comments
 

Author Comment

by:Brent92663
ID: 11774885
also i as an interesting symptom.. when the clients internet goes down, he can ping the pix.. but not telnet to it..
0
 
LVL 36

Expert Comment

by:grblades
ID: 11775530
Hi Brent92663,
Can you post the PIX configuration and I will have a look to see if there is anything wrong.
0
 

Author Comment

by:Brent92663
ID: 11775546
im not thinking there is a config problem, but maybe instead the interface is going bad..  the config has been in place for months,, and has been fine.
0
Introducing the WatchGuard 420 Access Point

WatchGuard's newest access point includes an 802.11ac Wave 2 chipset, providing the fastest speeds for VoIP, video and music streaming, and large data file transfers. Additionally, enjoy the benefits of strong security as the 3rd radio delivers dedicated WIPS protection!

 
LVL 36

Expert Comment

by:grblades
ID: 11775659
What is in your 'global' command on the PIX?
One common problem is if you have a range of IP addresses suppled. This uses standard NAT so if you have a renge of 20 IP addresses then 20 machines can simultaneously use the internet at any time. Adding new machines or different user behavious (running MSN for example) could mean there are more than 20 machines trying to gain access.
You normally have a mixed NAT/PAT or just a PAT setup.

The PIX should cache the ARP responses but if it stops getting a response from a machine it might decide to issue another ARP.
0
 

Author Comment

by:Brent92663
ID: 11775894
just a normal old global (outside) 1

we use a global nat for all the clients, and static nats for the servers

0
 
LVL 36

Expert Comment

by:grblades
ID: 11776479
You just have a single IP address listed and not a range?
0
 

Author Comment

by:Brent92663
ID: 11776710
global (outside) 1 interface

so all clients inside that do not have a static nat use the globalnat of the ip address of the external interface
0
 

Author Comment

by:Brent92663
ID: 11777803
well i found the problem.. proxyarp was enabled.. turned it off, and boom, were all good in the hood..
0
 

Author Comment

by:Brent92663
ID: 11816319
Case requested closed
0
 

Accepted Solution

by:
ee_ai_construct earned 0 total points
ID: 11934829
Closed, 500 points refunded.
ee_ai_construct (replacement part #xm34)
Community Support Moderator
0

Featured Post

Put Machine Learning to Work--Protect Your Clients

Machine learning means Smarter Cybersecurity™ Solutions.
As technology continues to advance, managing and analyzing massive data sets just can’t be accomplished by humans alone. It requires huge amounts of memory and storage, as well as high-speed processing of the cloud.

Question has a verified solution.

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

Do you have a windows based Checkpoint SmartCenter for centralized Checkpoint management?  Have you ever backed up the firewall policy residing on the SmartCenter?  If you have then you know the hassles of connecting to the server, doing an upgrade_…
The DROP (Spamhaus Don't Route Or Peer List) is a small list of IP address ranges that have been stolen or hijacked from their rightful owners. The DROP list is not a DNS based list.  It is designed to be downloaded as a file, with primary intention…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

719 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