Welcome to Linux Forums! With a comprehensive Linux Forum, information on various types of Linux software and many Linux Reviews articles, we have all the knowledge you need a click away, or accessible via our knowledgeable members.
Write an article for LinuxForums Today! Win Great Prizes!
Find the answer to your Linux question:
New to Linux Forums? Register here for free!
    Linux Forums > GNU Linux Zone > Linux Networking > How good of a network troubleshooter are you?

Forgot Password?
 Linux Networking   Hardware/Software related, Modems, Internet connection sharing, IPTables etc.

Site Navigation
Linux Articles
Linux Forums
Linux Downloads
Linux Hosting
Free Magazines
Job Board
IRC Chat
RSS Feeds
Linux Forum Topics
Linux Forums
Your Distro
Linux Resources
GNU Linux Zone
The Community
Reply
 
Thread Tools Display Modes
Old 02-10-2005   #1 (permalink)
Just Joined!
 
Join Date: Feb 2005
Posts: 4
How good of a network troubleshooter are you?

If your really good, can you answer my question?
I have the typical home setup: a router to the internet and internal network with various computers on it. All the internal computers can access the internet except one Linux box.
If I type `ping yahoo.com` it will resolve the IP
If I type `traceroute yahoo.com` it will start tracing the route.
When I type `wget yahoo.com` to responds 'failed:No route to host'
This box runs a web server and the router is configured to forward ports to the box. The web server will respond and work perfecty if computers connect from the outside world.
I can connect to internal machines without a problem.
If I use nmap and do a syn scan on an open internet port it declares that it is open, however if i do a tcp connect scan to the same port it declares that it is filtered.
I have replaced network cards and routers, to no avail.
I'm stumped as to what to try next. If anyone has any suggestions, I would be very greatful.
eolyn is offline  



Reply With Quote
Old 02-10-2005   #2 (permalink)
Linux Guru
 
loft306's Avatar
 
Join Date: Oct 2003
Location: The DairyLand
Posts: 1,666
well if you scan yourself with nmap over the inet back to your box you will get bogus info!
on the wget thing i dunno i was able to wget yahoo.com's index.html
__________________
~Mike ~~~ Forum Rules
Testing? What's that? If it compiles, it is good, if it boots up, it is perfect. ~ Linus Torvalds
http://loft306.org
loft306 is offline   Reply With Quote
Old 02-10-2005   #3 (permalink)
Just Joined!
 
Join Date: Feb 2005
Posts: 4
nmap

I actually have run nmap on the borked box and scanned a known good box on the internet.
eolyn is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Free Magazines
A Newbie's Getting Started Guide to Linux
Learn the basics of the Linux operating systems. Get to know what it is all about, and familiarize yourself with the practical side. Basically, if you're a complete Linux newbie and looking for a quick and easy guide to get you started this is it.
subscribe
Run Your Own Web Server Using Linux & Apache - Free 191 Page Preview
Learn about everything you'll need to build and maintain your Linux servers, and to deploy Web applications to them.
subscribe
Open Source Security Myths Dispelled
Dispel the five major myths surrounding Open Source Security and gain the tools necessary to make a truly informed decision for your IT organization
subscribe
InformationWeek
InformationWeek is the only newsweekly you'll need to stay on top of the latest developments in information technology.
subscribe



All times are GMT. The time now is 08:23 AM.






© 2000 - - All Rights Reserved - Property of  MAS Media

Content Relevant URLs by vBSEO 3.3.1