On Fri, Aug 27, 2010 at 7:56 PM, Roshan George <[email protected]> wrote:
> I should say that it worked itself out. I suspended my laptop and when I
> later woke it up it connected to the wireless network and I had Internet
> access. Strange, eh?

I don't like problems which manifest and fix themselves automatically.
It shows a lack of control and understanding on my/your part.


> Here's the thing. The Airtel tech set it up like this so I can't explain
> why it is the following way, but anyway here you go:

> Modem: 192.168.1.1 (if I connect to it directly with cable)
> Router: 192.168.1.1 (if I connect to it over wireless)

IP conflict!  Change wifi router's LAN IP to 192.168.1.2.

Your Linux system is probably using WiFi router's ARP
entry so it's unable to reach the web.  Windows computers
are using ARP entry of your DSL modem and are able to
get online.


Clean up your IP addresses.  Use the following scheme:

192.168.1.1-9 for network appliances (DSL/Wifi router, switches, VPN server)
192.168.1.10-19 for network printers, scanners, etc
192.168.1.20-49 for servers
192.168.1.50-99 for static IP assignment
192.168.1.100-199 for DHCP assignment
192.168.1.250-254 for testing/temporary assignment

If you have 2 DHCP servers, split the DHCP scope accordingly
eg. 192.168.100-149 on DHCP server 1 and rest on the other
DHCP server.  But ensure default gateway assignment is always
set correctly to 192.168.1.1.

- Raja
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