2 network connections on 1 device - cause?

[daveturnbull]

I have a windows 7 install which is behaving a little oddly after startup.

The issue is that is creates two network 'connections' on the same device, one private, one public. This causes them to conflict and refuse ant traffic over the device. To fix, all I have to do is disable the adapter then re-enable it and the public connection disappears leaving just the private one - all good. However after every startup I am left with the two conflicting connections.

If it makes a difference, it's a Dell XPS and the connection is wired (on board card).

Anyone have any thoughts as to why this might be happening, and better still, how to fix it?

 

[fowang]

You're sure that there isnt a wireless card on this PC?

 

[daveturnbull]

There is, but it is disabled.

The screen that lists all network connections shows both a private (work) and public connections on device 'Local area connection' which is the wired port.

If the two connections were on different devices, I'd understand that, but they're not.

I thought it might be an IPv4 / IPv6 issue, but my investigations into that drew a blank.

 

[fowang]

Have you checked IP config? Through CMD?

 

[MyGodAL3X]

I know that certain virtual machine softwares create "devices", maybe that is it

 

[daveturnbull]

No VM software running, ipconfig /all looks the same before and after a release / renew.

Screenshot below may help to demonstrate the issue. The public connection vanishes after a release / renew, but windows insists on creating it every time the PC is booted.

 

[fowang]

Can we view the full map?

 

[daveturnbull]

The full map only shows one route out regardless

PC -> Switch -> Gateway -> Internet

 

[daveturnbull]

Any thoughts?

 

[fowang]

You dont have a VPN connected?

 

[daveturnbull]

Nope, no vpn. It's a fairly standard setup of a desktop pc plugged into a small office network that routes through a switch to a firewall to a cisco fibre end point. All other PC's on the network get their DHCP ok and can connect to the internet without issue.

Because the issue is resolved with an ipconfig /release & renew, I was thinking it may be related to the startup order of services somehow. Maybe the network card starts, gets an IP, then tries to apply it's 'remembered' settings? Could be a complete red herring tho as I'm not a windows expert.

Is there any kind of log I could supply that might help diagnose this? It's quite annoying to have to release / renew every time I turn on the PC.

 

[Dark Lord of Tech]

This topic has been moved from the section Windows 7 to section Networking by Area51reopened

 

[Guest]

I have a windows 7 install which is behaving a little oddly after startup.

The issue is that is creates two network 'connections' on the same device, one private, one public. This causes them to conflict and refuse ant traffic over the device. To fix, all I have to do is disable the adapter then re-enable it and the public connection disappears leaving just the private one - all good. However after every startup I am left with the two conflicting connections.

If it makes a difference, it's a Dell XPS and the connection is wired (on board card).

Anyone have any thoughts as to why this might be happening, and better still, how to fix it?

Try flushing the DNS cache

in a command prompt window type

ipconfig /flushdns

 

[telazorn]

I am having this same issuw i am on a Dell Vostro 230 i did not have this issue till i formated and reinstalled the OS and all drivers...