Local area connection doesn't have a valid IP configuration - router as access point

Rusty Wood

Reputable
Nov 8, 2015
5
0
4,510
Hello,

So I've read several threads on here about this and tried a variety of solutions, but none of them seem to have worked.

The problem:
I have EE home broadband. A couple of days ago I suddenly lost internet access through an EE BrightBox router (henceforth "the router"), which I was using as an access point. The router is connected via powerline adapter to an older Netgear router used as the modem ("the modem"), and I normally connect both wirelessly with my laptop and wired with my desktop to the router.

The modem and the powerlines are working fine, and I've been trying to fix things by going through the same steps I went through to set up my wireless network in the first place, configuring the router as an access point (this consists of changing the gateway IP to match the subnet on the modem, changing the security type, SSID, channel and wifi password, changing the broadband username and password, and disabling DHCP).

However, as soon as I try to change the gateway IP on the router to match the subnet on the modem, I am unable to login to the router control panel. Turning off automatic IP assignment on my desktop and specifying the correct gateway IP address manually allows me to login; however, even then I still don't have internet access via powerline from my router.

In doing this I've mainly noticed the same error message as above, i.e. 'Local area connection doesn't have a valid IP configuration'.

What works/what doesn't
When I am physically connected to the router, my desktop has an IP address beginning 169.254.x.x. However, if I connect directly into a powerline adapter, I have internet access and I'm assigned a 192.168.0.x IP address as normal.

I have tried logging into the router control panel (when it's set up as an access point) using both desktop and laptop. Neither works.

When I reset the router to factory settings, I am able to login to the control panel.

When I test the router by unplugging the modem from the phone jack and plugging the router in directly, it works and I have internet through the router.

Here is my ipconfig /all with the router plugged into my desktop:

Windows IP Configuration


Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Autoconfiguration IPv4 Address. . : 169.254.18.61
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :

Tunnel adapter isatap.{18579D6A-1E94-43CC-AD61-DB1047ADA581}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

C:\Users\User>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : User-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : default
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : 00-24-1D-8A-D0-4E
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.default:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

System info:
I'm running Windows 7 Pro SP1 on an x64-based PC. Motherboard is Gigabyte MA-GA77OT-UD3P.

Things I've already tried


  • ipconfig /release, ipconfig /renew
    netsh winsock rest (etc.)
    Turn off Bonjour DNS (haven't got it)
    Checking all relevant services listed in Services are started
    Turning off IPv6
    Setting IP address manually
    Turning router on and off
    Turning PC off and unplugging
    Reinstalling Windows 7 (albeit only as an upgrade, not clean reinstall as I'd rather not reinstall all my apps unless I really have to)
    Downloading MS easy fix tool
    Updating/uninstalling/disabling network adapter driver
etc...

Many thanks in advance.
 

BuddhaSkoota

Admirable


You are not required to set a default gateway on a router configured as an access point. That address is only used on the WAN side (not in use on an AP) or for LAN DHCP (which is disabled on an AP).

If setting a gateway on the AP causes problems, then there is a configuration issue with your network.

Do you have the cable from the Netgear connected to a numbered LAN port on the BrightBox?

Are you sure that the LAN DHCP is disabled?
 

Rusty Wood

Reputable
Nov 8, 2015
5
0
4,510


That's an interesting question. What I do is, I disable DHCP and change the gateway IP of the router, then save settings, and that's when I lose the router - I can't then login to the control panel.

So I tell it to disable DHCP, but since I can't login, I can't be sure it's disabled.

I must say, all the tutorials I've seen have told me to set a default gateway.
 

Rusty Wood

Reputable
Nov 8, 2015
5
0
4,510


Sorry, forgot your first question. As I say, my Netgear router and my BrightBox router are connected via powerline. Up till now (for maybe a year or more), this hasn't been a problem.
 

BuddhaSkoota

Admirable


The basic steps to configure any router as an access point are essentially the same.

http://www.tomshardware.com/forum/36406-43-convert-wireless-router-wireless-access-point

The IP address of the access point must be in the same subnet as the gateway.
 

Rusty Wood

Reputable
Nov 8, 2015
5
0
4,510


The steps outlined there are indeed what I did and have done in the past. Previously it worked; now it doesn't.
 

lindstrom

Distinguished
Sep 20, 2010
66
1
18,665
Looking at your ipconfig your ethernet is disconnected, the 169.254.*.* is an apipa address which is getting assigned because the nic cant connect to the dhcp. Check your cables and if you have a link light on the back of the nic.
 

Rusty Wood

Reputable
Nov 8, 2015
5
0
4,510


Okay this is interesting...

Having spoken to an ISP tech support guy, who got me to do the migration wizard in the control panel and to switch to ADSL mode, I've now managed to get the router to work when connected by ethernet cable.

However, wireless still doesn't work. When I troubleshoot wireless, I'm told that the default gateway is not available. And I can see that, because my laptop thinks default gateway is 192.168.0.1 when I changed it to 0.254.

So things seem to have moved on. Thanks for ideas so far, anyone got any thoughts?

P.S. lindstrom - I've got a green light and flickering yellow light next to my NIC jack. I guess that means it's OK now (as opposed to before).