Re: dsn will not resolve address when sing cell modem
- From: "Phillip Windell" <philwindell@xxxxxxxxxxx>
- Date: Fri, 18 Jul 2008 09:54:31 -0500
"Jeff" <Jeff@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:F7C68B8A-6BB9-4AE0-B9D4-CE127BAA4A20@xxxxxxxxxxxxxxxx
Hi Anyone,
Heres the some history.
I have two connections to the internet. One being the normal LAN the other
being a DUN Cell modem.
Before joining or disjoining the domain both connections work and use the
correct DNS for the connection type.
No they don't. You just got "lucky".
DNS settings are *global* for the whole machine regaurdless of the Nic's
TCP/IP Specs they are set in. A machine should have DNS entries on only one
Nic with the rest left blank (can't do that with cell dialup because of
forced DHCP). A machine should never have more than one DNS server listed
unless those DNS servers are "redundant" to each other like a pair of DCs
(again, can't do that with cell dialup because of forced DHCP)
The Cell Nic is a "dialup technology". When a dialup connection is made it
"takes over" everything. A machine is not intended to use any other Nic or
any other "TCP/IP Specs" while the dialup is active. The intent of a dialup
connection is to:
1. Dial up/connect
2. Use for the specific task at hand
3. Immediately disconnect
4. Do not stay connected
5. All other communication on other nics/connections is [loosely] suspended
while the dialup is active.
Any activity that works with other nics/connection while the dialup is
active is just "lucky".
What I mean by "loosely suspended" is this,..The TCP/IP stack will still
work for the other connections. Routing pathes that are specific to the
other nics/connections will still route (like static routes). But default
routing (default gateways) becomes confused because you now have two Default
Gateways,..the one you first had, and now the one on the Dialup connection
forced on you by the DHCP on the opposite end of the connection,..and the
dialup connection usually (is supposed to) over-ride the other. Sometimes a
dialup will even over ride static routes although I haven't experimented
with that a lot,..but using Split-Tunneling (disabling "use gateway on
remote network" on the dialup) might relieve that. DNS?,..well DNS just
becomes a "crap-shoot". Usually the machine will just take the first DNS
entriy it sees on the Nic that is the highest in the binding order priority.
It will never attempt to use any other DNS unless the first DNS it attempted
just flat out does not respond at all.
--
Phillip Windell
www.wandtv.com
The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
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