RE: [cobalt-users] Strange IP Problem

["Tunc Eresen" <tunc@xxxxxxxxxx>]

Hello, 
Check your ADSL connection  if it uses router and this router may be
using firewall and filter functionality.    
 It looks like ADSL issue.
I use ADSL but do not use the router modem to firewall and filter. I use
UNIX based firewall www.bizguardian.com between the ADSL modem and the
PCS. Router has open link to the internet so that I can us it as DMZ
area. 

Best Regards, 

O. TUNC ERESEN


Hi everyone!

We have a cobalt RaQ3 which is used to host sites and email for
ourselves and our clients, and is located at our provider's data centre.

We recently changed the ADSL provider we use at our office, and through
our new connection we can't properly access our server.

The server has a main IP address used for all services, and a secondary
IP address which has only a couple of sites assigned to it.

<IP ADDRESS 1> - main IP address. We can ping and traceroute this
address, but NOT access web sites, email, SSH or Telnet through it. This
is our primary nameserver address.

<IP ADDRESS 2> - second IP address. We can ping and traceroute this
address, and access the mail server, SSH and Telnet. We have only a
couple of web sites set up at this IP address, but we can access them
fine. This is our secondary nameserver address.

The server has several URLs which are all set to resolve to <IP ADDRESS
1> - none of these work.

We get the above problem when accessing the Internet through our ADSL
connection. However, our ADSL provider also offers us dial-up access -
when we dial up to our account through a standard modem, there is no
problem.

The server is a Cobalt RaQ 3, using Apache Web Server, Mail Server,
Telnet, SSH, SSL, and provides its own DNS.

Anyone have any ideas what's going on? Our ADSL connection appears to
function flawlessly apart from this problem. We seem to be able to
access other web sites, including sites located on servers in the same
data centre.

A client of ours reported the same problem a few months ago with a
different ISP, and it was never resolved. Our ISP is looking into it,
but is having difficulty locating a problem as they can access the
server with no problems at their office. To us, it sounds like there is
a block being put on <IP ADDRESS 1> - but could it be a problem with the
RaQ? If so what do you think it is? If not, any ideas what the problem
could be or tips on how we can further investigate?

Any advice is greatly appreciated! Cheers everyone...

Si

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