concurrent dial-up and DSL: what happens?

[George]

My PC normally connects to the Internet by DSL, with the DSL modem reached
through a router. I've been having trouble reaching a particular URL, so I
tried using a diai-up connection on this same PC. (Which could reach the URL,
BTW.)

My question is, what goes on in that configuration? The dial-up is to a
different ISP. I can still read my mail, so I think that the DSL connection is
still working. But, tracert shows very different sequences in the two cases. I
guess that means the browser is using the dial-up connection? Also, my
newsreader can't connect when the dial-up connection is active.

Any insight would be appreciated.

TIA,
George

 

[Jon_Hildrum]

Effectively the dial up connection replaces the DSL connection. Your
computer will do all its internet access through the dial up as long as it
is connected.

 

[Chuck]

My PC normally connects to the Internet by DSL, with the DSL modem reached
through a router. I've been having trouble reaching a particular URL, so I
tried using a diai-up connection on this same PC. (Which could reach the URL,
BTW.)

My question is, what goes on in that configuration? The dial-up is to a
different ISP. I can still read my mail, so I think that the DSL connection is
still working. But, tracert shows very different sequences in the two cases. I
guess that means the browser is using the dial-up connection? Also, my
newsreader can't connect when the dial-up connection is active.

Any insight would be appreciated.

TIA,
George

George,

If your DSL service is working, and one specific URL is not reachable, check
your MTU setting. After you select "Never dial a connection" from the
Connections tab in Tools - Internet Options in Internet Explorer.
<http://nitecruzr.blogspot.com/2005/06/internet-connectivity-problems-caused.html>
http://nitecruzr.blogspot.com/2005/06/internet-connectivity-problems-caused.html

Do you have a good personal firewall on your computer? What happens when you're
connected thru the dial-up modem?
<http://nitecruzr.blogspot.com/2005/05/please-protect-yourself-layer-your.html>
http://nitecruzr.blogspot.com/2005/05/please-protect-yourself-layer-your.html

 

[Steve Winograd [MVP]]

Effectively the dial up connection replaces the DSL connection. Your
computer will do all its internet access through the dial up as long as it
is connected.

Jon has it right: as long as the dial-up connection is connected, it
replaces the DSL connection for all Internet access.

Are you trying to access a news server belonging to your DSL provider?
If so, you probably have to be using that provider's Internet
connection. They probably don't allow access to it from other
providers, such as your dial-up service.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com

 

[George]

George,

If your DSL service is working, and one specific URL is not reachable, check
your MTU setting.

Done that, changed it. Doesn't seem to help.

...

Do you have a good personal firewall on your computer?

Well, Zone Alarm (free). I also have a router.

What happens when you're connected thru the dial-up modem?

Broadly, everything seems to work more or less normally, and apparently using
the dial-up connection. More specifically, I can consistenly reach the URL in
question.

There's a whole thread about this at a verizon NG (0.verizon.discussion-general,
if you get it). As I understand it, the consensus is that somehow, the site
server is very slow feeding Verizon OnLine, which causes the connection to be
terminated. (Or something like that.) The dial-up test just sort of confirmed
that. I'll probably call VOL, someday.

I didn't intend to bore ppl by going over all that same ground again - I just
was curious as to what happens when you have dial-up concurrent with DSL. The
answer above (dial-up takes over) fits with what I see.

Thanks to all,
George