IT Employment

Ask something
Discussion Locked

New DSL connection

0 helpful
17 replies

by alex555

Closed to new repliesThis discussion is closed. It stays readable, but it takes no new replies.
I recently set up a network which consists of 4 computers and a server. I had a switch and a cisco router connected to my server and to my switch for DSL. No w I changed my ISP and I can't get my same router working on this new ISP. All I did is installed the software for the new ISP on my server and left the connections the way they were. What could be the problem?

17 replies

by lordinfidel

not every dsl provider uses the same circuit type.
Some use 0, some use 35.

That is probably the problem.

If you call up your tech support, they will tell you that your configuration is unsupported. Tell them you understand that, you just need to know what VPI/VCI circuit type they are using.

Then set your cisco up appropiately.

by jellimonsta

Is this a common problem L.I?.... I have never used DSL myself so I would not have guessed at this kind of problem. It is good to know though.

by lordinfidel

when you don't use the modem supplied by the dsl vendor, you can run into problems.

When I switched from ISP's at my home, I was using a cisco 1600. Well it worked for one provider but did not work for the other.

And since I was not using their modem, they would not support me. I figured out the problem but had to verify what settings they were using.

This most of the time will be a painful process, dsl ISP techsupport.

by omie

You need to change the setting in your router. One of the setting is the circuit dial up, Username and the password for new ISP then check also that NAT setup for your new ISP is giving up either a static IP or dynamic IP.

In the server check the dns setting for your new ISP has different number.

by alex555

So you think if I change the old DNS to the new one, would that work? And Does the new ISP necessarely supply me with a new DNS, which would obligate me to change the old one?

by lordinfidel

You need to use the settings that your ISP gives you. Unless of course you have set up your own internal DNS server that can resolve queries from your internal hosts.

Which then you don't need to use your ISP's DNS servers. But if you are using your OLD ISP's DNS servers, then no you will not be able to resolve address'.

Why?

Because like all good owners of DNS boxes, they (your old ISP) has their servers locked down as to how can submit recursive requests to it.

That is, "resolve hostnames from zones other then what the server is authoritative for".

So if your IP is not in their authorized recursive user list, your not going to resolve host names. No matter how hard you try.

by alex555

This seems to be exactly what I'm facing, because I'm not using their modem they don't support me, but if I do use their modem it only works on one pc. So what can I do? If I buy a new router and connect their modem to it will it work?

by lordinfidel

First, look at the DNS response. See if that is your REAL cause.

Have you tried pinging the default gateway of the PPP connection, from the router?

If you can ping the default gateway then the rest is either NAT/ACL issues or DNS.

(NAT/ACL if you can not ping/trace to the IP of the gateway from a client behind the router)

DNS if you can ping the gateway of the router but not resolve host names.

by alex555

so your saying that I would need to get rid of my router and get a new one, or just change my DNS and Ip

by lordinfidel

Several things...

1. Make sure that the external IP address of the router is correct. If you can not ping the default gateway, then something is wrong.

2. You can not use the same external (public) IP address or DNS servers that you had from your previous ISP. You *must use* the IP address provided by your new ISP. That IP address will become the external IP of your router. That IP must have a subnet mask and default gateway assigned to it. Without those 3 things, nothing will work. Not even DNS.

If none of this makes sense to you, then I would abandon using the router. And go back using their modem and connecting it to one machine.

OR buy a dsl router and be done with it.

by jellimonsta

What?.... you are not going to offer instructions on router config parameters and ACL setup?... Spoil sport :oP

by alex555

It makes a lot of sense, but how could I find out what the new IP address is from the new ISP?

by omie

If you are not familiar it is either read your router manual or ask somebody to configure it out for you. We can't give you the details on how to set up, for each router manufacturer varies on the configuration. One of them is the password to access the setting and what mode to use. Some router could be accessed through GUI and a lot of them through hyperterminal. Again you need a knowledge on tcp/ip, NAT, encryption and mode of connections.

by lordinfidel

My dogs kept me up all night..... I'm exhausted.
The bastards.

And I'm in the middle of doing actual work for the job that pays my bills. Securing a linux box that is on the west coast while i'm on the east coast.

Just got done building and installing it's firewall, now i'm moving on to building out IPSec .

I should just go home and do it from there.

by lordinfidel

You would know if you had a static IP address. You would of have had to request it from them.

If they did not assign you a static IP then you need to use DHCP in order to get the IP. Which means your IP address changes and does not stay the same.

If you did request a static IP and just don't know what it is, you need to call their tech support and ask them.

This discussion is closed to new replies.