Re: What's up with my network???

On 14.04.2006 16:04, Charles wrote:

 --- Original Message ---

> Windows SBS 2003 Server
> Cisco Pix 5??
> Headaches up to here...
> 
> So, randomly we'll be working and a computer on our network won't be able 
> to get to the greater 'net.  This, in itself, is odd, I suppose, but read 
> on, oh fearless one!
> 
> What, exactly, does "able to get to the greater 'net" entail?  Who the heck 
> knows???  I mean, really.  Well, often we are able to get our email.  And 
> even to get to web addresses on our ISP.  But no farther than that - either 
> by IP address or by FQDN.  What's weirder is that even though we have no 
> web access to these addresses we can still ping and tracert them without 
> any problems!
> 
> So...  Before I talk more about our config, any ideas???
> 
> Anyway, our client machines are set to use our SBS Server as primary DNS 
> and also have the two ISP DNS servers as backups.  (Yes, I've heard that 
> Windows doesn't always work well like that.  Perhaps we'll remove the ISP 
> DNS servers from that...)  That (ha!  You can't talk back to a 
> parenthetical statement in a paragraph!), ah, shucks, where was I?  Um.  
> That...  Well, whatever.  Our SBS server is running DHCP for us as well.
> 
> And when I say "a computer on our network" I mean one or more computers on 
> our network.  Often only one computer - equally often whole blocks of 
> computers (at least the 10 that are within shouting distance of my desk).
> 
> Anyway...  We'll likely spend a fortune having a consultant troubleshoot 
> this...  But if you have any brilliant ideas, well, hey, woo hoo!  That'd 
> be wicked cool!
> 
> c

Plug another (working) computer on the same wire to see if IT works ok.
If so then you've narrowed it down to the computer itself that doesn't
work (sometimes). If that's the case then the first thing I'd check is
for a babbling NIC throwing random packets out on the wire causing
collisions, etc ...