Cannot connect

I have a D-Link DSL G604T modem/router with a home network of three wired
and two wireless machines.
Until a few days ago everything worked perfectly but now I cannot connect
wirelessly to more than one machine at a time. (The wired connections are
still fine)
The computers in question are an Acer Travelmate laptop and an Asus Eee
netbook. I have tried repairing the connection, rebooting both machines and
resetting the router but it makes no difference, they simply cannot be used
simultaneously for Internet access. In fact, the computer that cannot
connect can't even get into the router's own firmware.
I'm hoping this doesn't mean the router is on the way out. Any ideas?
TIA
Badger

 

Hi,
Either laptop works when connected all by itself?

 

Hi,
Either laptop works when connected all by itself?

Yes it does. But last night both worked at the same time again. In addition
I found a mysterious new LAN connection showing up on the netbook with an
apparent speed of 614.4 kbps. WTF?
Badger

 

Check out how many DHCP's your wireless is set to give out. On many routers
it is the range of IP's it can assign, something like
192.168.1.10-192.168.1.20. If yours is currently set to allow for only one
IP then it's first come first served with the second device being ignored.

Possibly someone else in close vicinity has a similar router setup which is
interfering with your system.

Might try changing the subnet on your machine , SSID and or channel number,
especially if they are at the factory default settings.

 

Check out how many DHCP's your wireless is set to give out. On many routers
it is the range of IP's it can assign, something like
192.168.1.10-192.168.1.20. If yours is currently set to allow for only one
IP then it's first come first served with the second device being ignored.

Possibly someone else in close vicinity has a similar router setup which is
interfering with your system.

Might try changing the subnet on your machine , SSID and or channel number,
especially if they are at the factory default settings.

"Someone else in close vicinity" is a definite possibility since it only
started happening recently. I'll fiddle with settings and see what happens.
Thank you.
Badger