No DNS servers listed in IPCONFIG /all

6 Mar 2009 2:50 PM

Andy C

Windows XP Home
ADSL USB modem

I've got a dial-up ADSL connection that seems to have lost its DNS
servers. In the IP configuration they are set to 'Obtain DNS server
address automatically' but once dialled-up and connected they don't
show up on an IPCONFIG /all anymore, whereas they used to. I've tried
re-creating the connection, resetting the IP winsock and checking with
the ISP that I've got everything right. Still doesn't work.

See example below:
PPP adapter MyISP:

        Connection-specific DNS Suffix . :
        Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface
        Physical Address. . . . . . . . . : xx-xx-45-00-00-00
        Dhcp Enabled. . . . . . . . . . . : No
        IP Address. . . . . . . . . . . . : xx.189.148.48
        Subnet Mask . . . . . . . . . . . : 255.255.255.255
        Default Gateway . . . . . . . . . : xx.189.148.48

As you can see: no DNS servers listed. I can still ping hosts out on
the internet, just not by name.
If I manually add an OpenDNS server (208.67.222.222) I can browse and
ping by name.

Any clues?

6 Mar 2009 6:28 PM

James Egan

On Fri, 6 Mar 2009 06:50:16 -0800 (PST), Andy C
<andy.cipp***@gmail.com> wrote:

>Any clues?

The nameservers are usually assigned as part of the ppp negotiation so
perhaps a look through the logfile might show something.

To switch on ppp logging you need to edit the registry as follows

System Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\PPP]
Value Name: EnableFileTracing
Data Type: REG_DWORD (DWORD Value)
Value Data: (0 = disabled, 1 = enabled)

Setting the value data to 1 will record ppp.log in the windows\tracing
directory.

Jim.

9 Mar 2009 8:48 PM

Andy C

On 6 Mar, 18:28, James Egan <je***@jegan.com> wrote:
....
Setting the value data to 1 will record ppp.log in the windows
\tracing
directory.
-----------

Thanks for that Jim. Great idea. I'll give it a go.
Andy.