It won't have changed the private side - that will remain 192.168.0.1 or whatever.

Sounds like the DHCP server' date=' isn't. John is your PC set up to "obtain an address automatically"? (look under network connections, right click the local area connection, select properties, and double-click the TCP/IP protocol entry in the middle of the box)[/quote']

Just checked that and it is set up to obtain an address automatically.

Sounds like the DHCP server, isn't.

Surely even without DHCP working correctly it would still be possible to access the router admin page though? Unless it changed the IP address of the computer to be on a different subnet from the router, but that would imply DHCP is probably running...?

John - any chance you could go to "Start" -> "Run", type in:

cmd

and then OK...then in the black window which appears, type:

ipconfig /all

Then post up the output from this (except the physical address)...would probably give a better picture of what's going on.

There's nothing in there that would compromise you, as it's all local network stuff anyway.

Rob.

If his DHCP server, isn't, then he'll get an autoconfiguration address - 169.x.x.x which won't talk to the router, either.

John, Rob's suggestion will be very helpful if you can do that. If you go to the properties on the Command Prompt window, and enable "quick edit mode" you can cut and paste from it by swiping with the mouse, then using the right button to copy. You can then paste into a post.

Keep us informed.

Ok guys here are the results - (bar the physical address which i have deleted as suggested)

Windows IP Configuration

Host Name . . . . . . . . . . . . : your-904q9zk0ar

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Unknown

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Intel® PRO/100 VE Network Connecti

on

Physical Address. . . . . . . . . :

Dhcp Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

Autoconfiguration IP Address. . . : 169.254.161.143

Subnet Mask . . . . . . . . . . . : 255.255.0.0

Default Gateway . . . . . . . . . :

PPP adapter BT Broadband:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface

Physical Address. . . . . . . . . :

Dhcp Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : 86.129.76.209

Subnet Mask . . . . . . . . . . . : 255.255.255.255

Default Gateway . . . . . . . . . : 86.129.76.209

DNS Servers . . . . . . . . . . . : 62.6.40.178

194.72.9.38

Is this with the router connected to the PC? If it is, there is a problem as I'd expect to see the router's IP address next to the Default Gateway field in the first bunch of numbers!

Rob.

The router is connected via an ethernet cable and switched on, but I also have my old usb modem connected at the mo so I can actually get on-line, when i'm trying to get the router working I disconnect the old modem and plug the telephone line into the new modem/router

Suspected that's what you'd do...

The computer should still be able to see the router though, unless the BT modem/configuration somehow restricts access to other network devices, but that would seem strange... :rubchin:

Did you used to be able to configure the router with the modem plugged in? If so, I'd probably go for doing a reset on the router and see if that allows you to get to the router config screen...

Rob.

I'm not sure to be honest as I always unplugged the old modem from the computer when I was trying to set up the new one!!

I tried reseting the new router before and that is when the 'internet' light came on (so all were lit up - power, wireless, ethernet, DSL, internet) but then i couldn't get to the settings/config screen for the modem any more and get the message 'limited or no connectivity' and the little LAN icon in the bottom right corner has a little yellow warning triangle on it!

Your router is talking to BT OK, but is not granting you an IP address. The PPP interface _does_ have an IP address, suggesting you did the ipconfig with the modem connected?

Disconnect the modem, reset the router so all the lights are on, then reboot your PC, and try the ipconfig command again. Unless that's exactly what you did last time, in which case there is a problem with either the DHCP server in the router, or your cable. Shouldn't be the cable because if it was the computer would say "cable unplugged" rather than the "limited connectivity" message.

Another problem you may be having is that BT may have leased your public IP address to a particular MAC (physical) address, which is normally the modem. Some ISPs won't lease you another address until the lease on the existing one expires, and some require you to register the MAC address with them and will only lease IP addresses to the registered MAC address(es). I don't think you have the latter problem as your little "internet" light comes on, but it's hard to tell without being able to get into the configuration pages for the router. The reason you can't is because the IP address on your LAN connection is an "autoconfiguration" address - one the DHCP client assigns itself when it can't get a response from the server, and which doesn't match the subnet that the router is on - hence you can't talk to it. If things get desperate, we could try assigning your computer a fixed IP address in the right range so that we can get into the router while it is connected, and see what's going on...

Another problem you may be having is that BT may have leased your public IP address to a particular MAC (physical) address, which is normally the modem. Some ISPs won't lease you another address until the lease on the existing one expires, and some require you to register the MAC address with them and will only lease IP addresses to the registered MAC address(es).

Might be possible to spoof the MAC address of the modem onto the router to get round this if it is an issue...

Rob.

Here are the results with only the new modem/router connected all lights on, and everything reset/re-booted, only deleted physical address again everything else is as displayed-

Windows IP Configuration

Host Name . . . . . . . . . . . . : your-904q9zk0ar

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Unknown

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Intel® PRO/100 VE Network Connecti

on

Physical Address. . . . . . . . . :

Dhcp Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

Autoconfiguration IP Address. . . : 169.254.161.143

Subnet Mask . . . . . . . . . . . : 255.255.0.0

Default Gateway . . . . . . . . . :

Hmmm - as I suspected, the DHCP server is not serving you an address.

Now it gets more complicated :(

Might be possible to spoof the MAC address of the modem onto the router to get round this if it is an issue...

Rob.

Yes and most routers will allow you to do this, but I don't think BT register MAC addresses.

John - what RJ45 (ethernet) ports does the router have on the back?

If it has multiple ports, have you tried the PC in more than one of them? Does it have any activity LEDs on the individual ports?

Only one Ethernet port, one Line port and a power connection, although i've just noticed a tiny 'reset' hole next to the power connection, would this reset better than disconnecting power?

The ports themselves have no LED's on them.

It was a pretty cheap modem/router, only

The reset button will restore the router settings to default. That may be a good thing - not sure what you've changed so far. It needs some on the spot diagnosis now - nobody able to help you locally?

I could probably find someone to help, Dont think any of my mates are technical enough though!!

I know a couple of guys that run an internet gaming centre that I could probably convince to come and have a look if I offer them a few free cab rides! their regular customers so shouldn't be a problem.

Thanks for all your help and advice anyway, really appreciate that.

Cheers, John.

Hmmmm, my Netgear DG834G is going odd on me. :grumpy: Twice now its stopped sending the wireless signal out to the other laptops. :confused:

I've rebooted it using the 192.1 blah blah control screen, but I'm worried long term, it might be fooked. :(