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From: Mike Easter <MikeE@ster.invalid>
Newsgroups: comp.os.linux.networking
Subject: Re: Frustrated that I don't UNDERSTAND why my network times out
Date: Wed, 09 Oct 2013 18:02:34 -0700
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billy wrote:
> Mike Easter wrote:

>> The bugs.centos server login is at a different IP 83.149.86.133
>
> When I point my browser to http://83.149.86.133 I get the message:
>   Forbidden
>   You don't have permission to access / on this server.
>   Apache/2.2.3 (CentOS) Server at 83.149.86.133 Port 80

When you are trying to access a webserver, you should aim at its name, 
not its IP address for general purposes.  One webserver might serve many 
names.  The bugs front page is at: http://bugs.centos.org/main_page.php

login is at 
http://bugs.centos.org/login_page.php?return=%2Fmain_page.php%3F

> # telnet 83.149.86.133 80

My browser pointed at that IP gives me a forbidden page instead of the 
bugs.centos front door..

http://83.149.86.133
Forbidden
You don't have permission to access / on this server.
Apache/2.2.3 (CentOS) Server at 83.149.86.133 Port 80

Some webservers which serve only one front page will give you that page, 
but some will not serve you the page when addressed the IP way.

That 'rule' does not apply to such as mailservers and news servers who 
don't care about the name vs the IP, except that the name is 'better' in 
the sense that the name might have more than one IP.

> <h1>Bad Request</h1>
> <p>Your browser sent a request that this server could not
> understand.<br />

> # traceroute -M icmp 83.149.86.133

> 15  centos.yourname.nl (83.149.86.133)  239.189 ms

> So, I have absolutely no problem getting to this site.
> But, why would I have a problem getting to centos.org?

bugs.centos.org is at a different place than centos.org but they have 
the same nameservice.

> Could it be that anything after 15 hops fails no matter what?
> To test, do you know of a site that would be more than 15 hops
> away from San Francisco, CA?

I don't think that is a useful theory.


-- 
Mike Easter