?
Solved

CentOS network issue

Posted on 2011-03-21
12
Medium Priority
?
394 Views
Last Modified: 2012-06-21
Hi,

My centOS 5.5 server can ping the wireless router but not the laptops in the intranet. The laptops however can ping the server. All laptop and centOS server are assigned IP automatically.

Please help.

Thanks
0
Comment
Question by:wsyy
  • 5
  • 4
  • 3
12 Comments
 
LVL 12

Expert Comment

by:upanwar
ID: 35187367
Which OS you are using in your laptops. If its Linux then stop the firewall by issuing below given command.

# iptables --flush

and try to ping your laptop.

If you are using the WIndows XP then disable the firewall from your network connection properties.

0
 
LVL 8

Expert Comment

by:pilson66
ID: 35188872
In yout wireless router, you need to disable feature named like "Set AP isolated".
This feature prevents wireless clients communicate with each other.

Or, if you setup wireless router as "router", and connect intranet segment to WAN port  - you need to set router to "AP" (not routing) mode and connect intranet segment to one of LAN ports in riouter.

P.S. Sorry for my English.
0
 
LVL 8

Expert Comment

by:pilson66
ID: 35189267
Also, in wireless routeryou need to disable DHCP server, to prevent conflicts with DHCP server in intranet segment.
0
The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

 

Author Comment

by:wsyy
ID: 35190612
upanwar:

My laptops are using Windows 7. Do you think that is the reason?
0
 

Author Comment

by:wsyy
ID: 35190717
pilson66:

The network topology is this:

1. An adsl modem connected through PPoE to internet (outside network);
2. A wireless router connected to the modem;
3. A centOS server directly connected to one of the router's port;
4. A few laptops and desktops of Windows 7 OS connected to the router wirelessly.

I don't think I have firewall set up explicitly unless Windows 7 automatically does.

Also, I don't know why I have to stop DHCP internally since the laptops and desktops work fine, and the server can get internet as well. The only issue is that the CentOS server can't connect to the laptops and desktops while the laptops and desktops can ping it.

Thanks
0
 
LVL 12

Expert Comment

by:upanwar
ID: 35190763
Disable the firewall on one of your desktop or laptop and test. It should work.
0
 
LVL 8

Expert Comment

by:pilson66
ID: 35190842
Laptops connected through Wi-Fi? If yes - you need to disable feature named like "Set AP isolated".
This feature prevents wireless clients communicate with each other.
0
 
LVL 8

Expert Comment

by:pilson66
ID: 35190866
Also
on CentOS: show "ifconfig" and "iptables-save"
on laptops: show "ipconfig /all"
0
 

Author Comment

by:wsyy
ID: 35191743
upanwar:

I just notice that the laptops have Windows Firewall on. Is this what you mean?
0
 

Author Comment

by:wsyy
ID: 35191771
I will check the solutions you guys recommended.

Please take a look at this post and help!

http://www.experts-exchange.com/OS/Unix/Q_26903551.html
0
 
LVL 12

Accepted Solution

by:
upanwar earned 1000 total points
ID: 35191803
Yes, just disable that and check.
0
 

Author Closing Comment

by:wsyy
ID: 35195113
Thanks great help!
0

Featured Post

Take Control of Web Hosting For Your Clients

As a web developer or IT admin, successfully managing multiple client accounts can be challenging. In this webinar we will look at the tools provided by Media Temple and Plesk to make managing your clients’ hosting easier.

Question has a verified solution.

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

Why Shell Scripting? Shell scripting is a powerful method of accessing UNIX systems and it is very flexible. Shell scripts are required when we want to execute a sequence of commands in Unix flavored operating systems. “Shell” is the command line i…
I have written articles previously comparing SARDU and YUMI.  I also included a couple of lines about Easy2boot (easy2boot.com).  I have now been using, and enjoying easy2boot as my sole multiboot utility for some years and realize that it deserves …
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
In a previous video, we went over how to export a DynamoDB table into Amazon S3.  In this video, we show how to load the export from S3 into a DynamoDB table.
Suggested Courses
Course of the Month6 days, 12 hours left to enroll

592 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