Limited or no connectivity

Jordk

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Feb 24, 2010
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I have 2 connections on my computer, my wireless usb modem and my local area connection, my wireless usb modem supplies my computer with internet connection, which is then shared with my local area connection which then supplies my xbox with internet connection, enabling me to play xbox live, enabling me to kick ass on mw2, at least thats how it was a few days ago. One day i boot up my computer and turn on my xbox to find that i cant connect to xbox live and my local area connection has limited or no connectivity. I went into the TCP/IP settings of my local area connection and specified the IP, DNS servers etc. which restores full connectivity, but still xbox live cant connect and gives me the error message:
"Your DNS server cant resolve the names of the xbox live server or xbox.com" and then when I turn it back to auto it acquires network address for awhile then gets "limited or no connectivity" status again
My xbox reports that the network is fine, so its nothing to do with turning routers on and off or a loose cable.
Also when I turn my local area connection onto shared it messes up my computers internet access.

Thanks.

Network info:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Administrator>ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : COMP
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Wireless Network Connection 5:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Sierra Wireless HSPA Network Adapter

Physical Address. . . . . . . . . : 00-A0-D5-FF-FF-A9
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 10.123.107.253
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 10.123.107.253
DHCP Server . . . . . . . . . . . : 10.123.107.252
DNS Servers . . . . . . . . . . . : 82.132.136.102
82.132.136.103
Lease Obtained. . . . . . . . . . : 24 February 2010 01:35:30
Lease Expires . . . . . . . . . . : 27 February 2010 01:35:30

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connect
ion
Physical Address. . . . . . . . . : 00-08-74-F9-EB-42
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Autoconfiguration IP Address. . . : 169.254.6.119
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :

C:\Documents and Settings\Administrator>

Refreshed tha ipconfig info.
 
Something's not clear. I’ve never heard of a wireless usb modem. I've seen wireless routers connected to a modem (it may be usb capable, but it's usually connected to a router). You need to be very precise here because I'm trying to determine where the DHCP server is in this configuration, if at all (usually it's the router, but you don't specifically mention one). Usually ppl have something like this:

[modem](lan)<-- ethernet wire-->(wan)[wireless router](lan)<--ethernet wire-->(lan)[pc]

Is this what you have? If not, plz clarify.

Or just give me the make/model # of your equipment (modem, router, etc.)
 
P.S. You don't need to hide/obscure your local IP addresses (10.123.*.* or 169.x.x.x), these are used by everyone, and are untraceable back to any particular network. The only thing you need to hide is your public IP, which isn't even listed in the ipconfig unless you're directly connected to the modem. Hiding those local IPs may actually make it harder to solve the problem.
 

Jordk

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Feb 24, 2010
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I have a usb modem plugged into my computer, an ethernet cable connecting my computer and router and then another ethernet cable connecting my router to my xbox.
hope you can understand that, thanks.
 


So something like this:

[modem](usb)<-- usb cable-->(usb)[pc](lan)<--ethernet wire-->(wan)[router](lan)<--ethernet wire-->(lan)[xbox]
 


Does the usb modem have ethernet as an option? IOW, could you connect it to the PC w/ a network cable instead of USB?
 

Jordk

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Feb 24, 2010
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No, but this setup was working fine just a few days ago and ive not changed any settings what so ever.
 


I understand. But you have to be careful w/ how you hook these things up. Just because it worked initially doesn't mean it's necessarily right. You can create situations were it actually will sometimes and not others. Aftera all, that's where we are NOW! Just stay with me.
 
So let's be clear, this is your configuration:

[modem](usb)<-- usb cable-->(usb)[pc](lan)<--ethernet wire-->(wan)[router](lan)<--ethernet wire-->(lan)[xbox]

USB cable or direct, it's the same.

I noticed on your IPCONFIG dump a wireless adapter (Sierra Wireless HSPA Network Adapter), where does that come into the picture, so far it's unaccounted for.
 

Jordk

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Feb 24, 2010
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I noticed on your IPCONFIG dump a wireless adapter (Sierra Wireless HSPA Network Adapter), where does that come into the picture, so far it's unaccounted for.

That is tha usb modem itself.
 


So what's the wireless connected to? I assume this modem is connected by hardwire to cable or dsl. Is it not? Or is it perhaps using wireless to some wifi service you're using for Internet access. Just trying to get the picture right because you have a rather, shall we say, interesting configuration there. LOL

 

Jordk

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Feb 24, 2010
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Lol, its a temporary fix until i get my isp back, but anyway tha modem connects directly to my computer via a usb port, just like a flash drive would for instance, as simple as that.
 
Sorry for hitting you with all these questions, but they matter, a lot.

Here's what I see.

You're using your PC as a bridge between the network connections, which is fine. However, you have a problem. The public IP from your ISP is being assigned to the network connection on the usb side of your PC. But it’s not clear where the other network connection is getting its IP assignment because there’s no DHCP server available there. If that network connection is using DHCP, then it will fail to initialize its IP assignment (and all other TCP/IP parameters), give itself an IP in the 169.x.x.x range, and be useless. And even if manually assigned an IP it would be useless unless those two network connections are at least bridged. And even being bridged would be insufficient since you need a gateway between the two networks to NAT the public IP on the usb connection over to the other network!

In short, it’s a bit of a mess.
 

Jordk

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Feb 24, 2010
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Could you at least gimme a reason how all this could have happened cos one minute it was working fine, then tha next minute it wasnt, with no evident reason why ?!?!
 


I can't. Based on what you've described (at my prompting), I don't see how the USB connection to the PC and the PC connection to the router could have ever communicated unless you specifically bridged those connections, OR, used ICS to configure a gateway (which would bridge as part of its own configuration). That’s the only path the xbox has to the ISP, it must jump from one connection to the other, somehow. You can’t just have two separate network connections and have them magically communicate! You have to bridge them, and the default is to NOT bridge them. Since I don't know the full history here, and I'm just relying on your descriptions, I remain stumped as to how this could have ever worked, at least as described.

 
Consider the network connection from the PC to the router (LAN to WAN). I fully understand why that connection is getting an IP address of 169.254.6.119 and no gateway IP.

Anytime you get a 169.x.x.x IP, it means the computer tried to issue a DHCP request to initialize the IP settings. But it couldn’t, so it assigned itself an arbitrary number in the 169.x.x.x range AND no gateway IP. It makes perfect sense. Because it’s not bridged to the usb connection, it can’t possibly make that request to the ISP. And since it’s connected to the router over the WAN port (where DHCP requests can not travel past, even though that router has a DHCP server), it ends up failing to contact any DHCP server and configures itself as I described; 169.254.6.119 and no gateway IP.

IOW, I can’t tell you how it worked before, but I can definitely tell you why it’s not working NOW.
 

Jordk

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Feb 24, 2010
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hahaha thats weird.
But this is tha setup i would normally have even with a dsl modem, but instead of a dsl modem i have a usb modem.
Forget that cos the modem would be connected to tha router not directly to that pc.