How Can I Share A Dial-up Connection On A Lan?

[opalhort]

We are on TRUE ADSL over a modem/router and all is fine.

This week a truck pulled our ADSL line down. (notified TRUe at 5PM, they came and repaired the next day by noon - good service)

During the outage I used dial-up, which was working ok on my PC (XP, SP3) and our LAN was working OK.

When I tried to set my dial-up connection to share with other users on the network my connection to the LAN went down. Other PCs could still communicate with each other but mine was cut off. Once I un-ticked the share box the network was back to normal.

What is the reason and how can I set up a dial-up connection to share if need be without having to go through a lot of set up every time an ADSL cut happens?

opalhort

[thaimite]

When you set up yyour dial up connection to be shared it will change your Lan card address to 192.168.0.1. If this is a different subnet (range) to the other PC's they will not be able to communicate you and you will not be able to communicate with them. For examplpe Linksys routers generall runon the 192.168.1.x subnet by default

Assuming you are using Windoze it is difficult to change this default setting so the only answer would be to change all the devices on the an so that they than work on the 192.168.0.x range of IP addresses. Depending on you configuration this may also mean changing your router settings and DHCP settings.

To clarify the above you can change your LAN card easily but other services provided by the Internet sharing such as DHCP and DNS are not changeable as far as I know although it may be different in Windoze 7

[opalhort]

When you set up yyour dial up connection to be shared it will change your Lan card address to 192.168.0.1. If this is a different subnet (range) to the other PC's they will not be able to communicate you and you will not be able to communicate with them. For examplpe Linksys routers generall runon the 192.168.1.x subnet by default

Thank you very much for this info. It explains everything. Our router (Billion) runs on 192.168.1.x

Any way to change the auto WIN setting for LAN card address when activating share?

opalhort

[thaimite]

When you set up yyour dial up connection to be shared it will change your Lan card address to 192.168.0.1. If this is a different subnet (range) to the other PC's they will not be able to communicate you and you will not be able to communicate with them. For examplpe Linksys routers generall runon the 192.168.1.x subnet by default

Thank you very much for this info. It explains everything. Our router (Billion) runs on 192.168.1.x

Any way to change the auto WIN setting for LAN card address when activating share?

opalhort

Without seeing your system this is just a rough guide of ideas

I do not think There is an easy way to make the switch over.

For XP and I believe Vista/Win 7 there is no way of changing the DHCP or DNS settings of the Internet sharing. It was able to be done in Windoze 98 but then M$ improved the syste!!!!

Whatever you do may need some configuration to change over

Not knowing how many or what type of devices you have it is difficult to advise but for a small system the easiest way is as described below

The problem is that with ADSL the Billinton router will do NAT, DNS and DHCP and provide and be the default gateway, but with Internet conection sharing your PC provides these services.

Thus the first thing you will have to do is to change the Billington router to be on have the IP address of 192.168.0.1. and also ensure that it issues DHCP addresses on the same subnet.

Next you have to change the IP addresses of all fixed IP devcies to 192.168.0.x (including your own PC

Because when you go to Internet connection sharing Your PC provides the NAT,DNS and DHCP services, so the IP of your PC and the IP of the router have to be changed. Your PC rather than the router will now be 192.168.0.1 and the router should be changed to something different e.g. 192.168.0.2

[thaimite]

Having some more thoughts, the easiest way to get what you are looking for (but will cost money) is to obtain a router that accepts multiple inputs such as ADSL and a USB modem. These switch over fully automatically and can also load balance if both sources are available.

Such devices are available i Bangkok for approximately 6000 Baht up but I have lost the links to the supplier

EDIT

Here is a typical device that would do your job

http://www.surfnshop.biz/index.php?lay=sho...e&Id=348101

[opalhort]

Thanks for all your replies.

I do understand now where the problem is and how I could solve it.

We have a 4 PC LAN (3x XP pro, 1x Vista ultimate)

All PCs have their own dial-up connection (we have three tel lines) but during the recent ADSL cut (first in over three years) my son found out his modem is dead (never used it) and I tried to set up a dial-up connection for sharing.

It didn't work and now I know why.

No reason to go through all the changes in the router for the rare case when our ADSL is down.

A new modem for my sons' PC will solve the problem.

Thanks again

opalhort

[garyh]

A simple fix would be to buy a basic network switch and do away with the modem/router for now, they are not expensive. Then make sure all the other computers are set to auto IP and Auto dns.

Windows is not hard to setup as someone suggested it is.

[opalhort]

I do have a LAN switch (not a hub) which I could use (had it since the time before we had router and ADSL). All PCs are set to auto IP/DNS anyway so this could be an easy solution if the need should arise again.

Thanks for the tip, I didn't think of that one.

opalhort

[SurfRider]

.

Wingate should work, but it requires a license -- or you could probably find it on Torrent

WinGate Proxy Server allows you to:

Provide secure and managed Internet access for your entire network via a single or multiple shared internet connections

http://www.wingate.com/products/wingate/index.php

.

[garyh]

I do have a LAN switch (not a hub) which I could use (had it since the time before we had router and ADSL). All PCs are set to auto IP/DNS anyway so this could be an easy solution if the need should arise again.

Thanks for the tip, I didn't think of that one.

opalhort

Just for your information.

The reason you could not get the other computers to connect is the Router is controlling the network IP addresses (DHCP) So taking it out of the picture would allow the computer with the shared dialup connection to take over this role. then all the other PC's would take on the IP address provided by the Host computer.

[opalhort]

Thanks for all your replies.

I understand and now know how to handle the situation should our ADSL go down again for a longer period of time.

I just wasn't aware of the IP address issue but now it's clear.

We just ran a test with the old LAN switch. Took all LAN cables off the router and plugged them into the switch, used dial-up on one PC and shared it ----> all worked OK!

opalhort