Re: [cobalt-users] Strange IP Problem

[Gerald Waugh <gwaugh@xxxxxxxxxxxxxxxxxxxxxxx>]

On Tue, 1 Oct 2002, Ethos Subscriptions wrote:

> 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...
>

Does you ADSL software contain a firewall? It may need a little tweaking,
not much, but what else?
Are other people (not the ISP) on the Internet able to reach the sites?

It is really difficult to trouble shoot this problem without the actual
domain names or ip addresses.
If you don't want to post tehm send off list and I will take a look.

Gerald
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