Networking 2 laptops with different OS's Help!

  User-1298892 22:35 05 Oct 2008
Locked

Hi,

I have 2 laptops and I'm having problems getting them both to connect wirelessly at the same time. I have:

An Acer Aspire 6920G running Vista
A Sony Vaio VGN N11M running Ubuntu

I am with Virgin Media for broadband and I have a Linksys wireless router.

The problem is that only one or the other will connect at any one time. If I use the Acer then try and use the Vaio after it, I have to unplug both modems, plug them back in and try to connect again. Then the Vaio will conect but once again if I want to switch I have to turn the modems on and off!

Also for some reason I can only access the linksys router settings through the Vaio!

Any help/suggestions would be much appreciated as I'm not sure where to start!

Thanks

Cp

  brundle 22:57 05 Oct 2008

"I have to unplug both modems, plug them back in and try to connect again. Then the Vaio will conect but once again if I want to switch I have to turn the modems on and off!" - can you explain that? Are you referring to wireless adapters? Cables?

  brundle 23:00 05 Oct 2008

Connect with the vista PC.
OPen a command prompt (just type command at the search bar, it will appear).

Type

ipconfig

Scroll back up the long list that appears for your Local Area Connection. What does IP address say? Is the word Yes present after DHCP Enabled?

Now disconnect the Vista machine, connect with the Ubuntu machine. OPen a terminal window. Type

ifconfig

What is the IP address?

  User-1298892 23:17 05 Oct 2008

Hi, thanks for answering so quickly!

I just mean I switch both modems off at the wall, wait a few seconds then turn them back on again, both the virgin (speedtouch) modem and the linksys wireless modem.

My windows ipconfig screen says:

IPv4 address: 82.42.203.239
DHCP is enabled

Subnet mask: 255.255.254.0

There are no other IP addresses listed, but if you need me to note all the other numbers let me know!

Just about to switch laptops now... see you in a sec!

  brundle 23:22 05 Oct 2008

Just two things. Make and model of both modems and method you use for broadband - cable or phone-line? Sounds as though you have things a little mixed up to me, you only ever need one modem. If you're using ADSL the modem ought to be built into the linksys.

  User-1298892 23:41 05 Oct 2008

Hi Brundle,

I have a scientific atlanta 2100 which is from virgin media and is a wired cable broadband modem. I wanted wireless at home so I bought a linksys Befw11s4 wireless router and connected it to the cable modem. Both worked fine and still do! I just cant access the internet with both laptops at the same time!

The ifconfig screen from the ubuntu laptop says:

ath0 Link encap:Ethernet HWaddr 00:16:cf:c5:75:58
inet addr:82.42.30.161 Bcast:255.255.255.255 Mask:255.255.248.0
inet6 addr: fe80::216:cfff:fec5:7558/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1763 errors:0 dropped:0 overruns:0 frame:0
TX packets:222 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:262732 (256.5 KB) TX bytes:34225 (33.4 KB)

eth0 Link encap:Ethernet HWaddr 00:13:a9:80:8b:3f
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:17

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1657 errors:0 dropped:0 overruns:0 frame:0
TX packets:1657 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:82912 (80.9 KB) TX bytes:82912 (80.9 KB)

wifi0 Link encap:UNSPEC HWaddr 00-16-CF-C5-75-58-00-00-00-00-00-00-00-00-00-00
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6110 errors:0 dropped:0 overruns:0 frame:1246
TX packets:439 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:199
RX bytes:712903 (696.1 KB) TX bytes:50503 (49.3 KB)
Interrupt:18

Sorry its long but I wasn't sure what part you needed!

Thanks

  brundle 23:48 05 Oct 2008

OK, just that you mentioned Speedtouch and they mainly do ADSL kit (as far as I'm aware).
The modem is a modem, the router isn't. No need to unplug either of them to connect with one or other machine in the normal course of things. If you keep swapping between router and PCs connected directly to the modem it will cause problems, there is an association formed between your equipment and the connection at the ISP end. First thing is to turn everything off for 10 minutes, switch modem on, wait for lights to settle. Switch router on, wait another minute or so, switch on computer(s). Can you connect using both computers if you connect them both to the router with a cable? Do they both work fine wirelessly on their own?

  brundle 23:50 05 Oct 2008

The ifconfig listing is fine, no problem. Looks like everything is working OK. You connected both machines directly to the modem for those results right? They're showing a public IP address, not the private IP address they would be given if you connected them to the router.

  brundle 23:51 05 Oct 2008

"The ifconfig listing is fine, no problem. Looks like everything is working OK." - I ought to clarify - your internet connection is fine, your machines are getting an IP address which is also good, but you appear to be connected to modem and not the router....

  brundle 00:01 06 Oct 2008

This might help click here. If DHCP is enabled on the Ubuntu machine which it appears to be, you should have no problem connecting with cables (which you should establish all works first) - then you can disconnect one and set up the wireless connection, check it's working as it should, then set up wireless on the other.

  User-1298892 00:01 06 Oct 2008

When the problem first started I went through loads of forum posts and googled everything. Both machines work fine if connected directly to the modem with a wire, both work fine wirelessly. I have used both machines tonight!

The problem is still the same though, for instance now that I'm using the Vaio, the Acer won't connect. Vista says 'It may be a DNS issue, as we failed to connect to the well known site click here through DNS'

If I turn this vaio off, I still won't be able to connect but if I then power off the modem and router, wait a few seconds then switch them back on the Acer will be able to connect! If I then tried to use the internet with the vaio laptop it won't connect! They can both see the linksys router but as i say I can only actually use the internet using one at a time! Its really frustrating :-(

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