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Thread: LAN vs Dial-up

  1. #1
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    LAN vs Dial-up

    I use a LAN with Internet connectivity for browsing the internet, but I have to use a jolly steam-powered dial-up for getting my email (company security policies prohibit POP through the firewall, and yes I know that I'm compromising them by using the dial-ups but I need them and the local admin is happy to quietly let me - don't ask!).

    Anyhow, there I am happily downloading a 17Mb attachment on the LAN (using my "real" network adapter) and then Outlook kicks in and opens up a dial-up connection on my "dial-up" network adapter (presumably a virtual thing, but there it sits happy as Larry in my network settings). The LAN promptly stops, and I have to restart the download. Aargh!

    Given that I've appararently got two adapters, one for the LAN and one for the dial-up, why does Windows persist in letting the dial-up over-ride everything and take over my network settings, and is there anything that I can do about it before I hurl Windows out of the window, screaming? Not that I'm frustrated, or anything!

    Thanks.

    Stuart

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    Re: LAN vs Dial-up

    You might try disabling dial up while your trying to download.

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    Re: LAN vs Dial-up

    This is caused by the dial up connection setting a new default route. You can prevent this by clearing the flag "Use default gateway on remote network" in the dial up connection. You can find this flag from the properties of the connection (go to Networking > TCP/IP Properties > Advanced > General).

    Once you have cleared this flag you may have a problem accessing your mail server via the dial up connection. In which case you will have to ADD a route to the mail server using a syntax like
    ROUTE ADD a.b.c.d NETMASK 255.255.255.255 e.f.g.h
    where a.b.c.d is the IP address of your mail server and e.f.g.h is the IP address for your dial up connection. Depending on the exact addresses and sub nets this may not be necessary.

    StuartR

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    Re: LAN vs Dial-up

    OK, tried that. It certainly allows me to carry on downloading while I connect to the dial-up, but as you suggested I can't now find my email server.

    I tried doing what you suggested, but a) my ISP gives me a dynamic address, so how can I put it into the route, and [img]/forums/images/smilies/cool.gif[/img] even when I connect and pull up the IP address I still can't create the route as, apparently, the gateway can't be found on my network (or something like that). What should I do?

    Thanks.

    Stuart

  5. #5
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    Re: LAN vs Dial-up

    Sorry for the delayed reply, I have been travelling.

    Try noting your dial up IP address, as allocated for this particular connection, and adding that as the default route to your ISP's servers (which will usually all be on one subnet). For example I use Demon Internet in the UK as a service provider, so I could issue the command
    ROUTE ADD 194.217.242.0 MASK 255.255.255.0 w.x.y.z

    In this case w.x.y.z is the address that my ISP have given me for the dial up connection, this routes all requests for hosts in the range 194.217.242.0 to 194.217.242.255 via the dial up connection.

    Because the w.x.y.z is dynamic you may have to type this by hand, although I vaguely remember a bat file that could get this information - I'll try to remember where I found it.

    regards,

    StuartR

    Edited by StuartR to add
    Another option that might work if you have a web proxy server on your LAN is to add a fixed route to the proxy server via your LAN IP address and re-enable use of the gateway on the dial up connection

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