[plug] Wireless Internet

[Daniel Pearson]

Craig Ringer wrote:

>On Tue, 2005-06-14 at 17:36 +0800, Chris Watt wrote:
>  
>
>>Hi Guys,
>>
>>Just finished setting up Dianne's computer today at Midway and we have
>>a small problem.  While it connects to the wireless network no
>>trouble, she can't get into the internet at all.  Het email times ot
>>and not even google comes up.  Any ideas what could be causing this? 
>>    
>>
>
>It'd only be guesswork. Instead, let me provide a series of basic
>network troubleshooting hints / steps to collect the information
>required to properly diagnose the problem.
>
>Is this a Linux box? WinXP?  I'm assuming Linux, so:
>
>First you need to check that the network interface has the right IP
>address. You can use `ifconfig' for that. Please post the output of all
>these commands if you follow up with any additional questions, by the
>way.
>
>Next, check that the default route is present and correct. For that,
>use:
>
>	ip route show
>
>or, if you don't have the `ip' command:
>
>	route -n
>
>If that all looks OK, ping the default gateway:
>
>	ping -c 4 $GATEWAYHOST
>
>then the IP of a known-good host such as iiNet's DNS server (I've never,
>ever, seen it down, and it replies to ICMP ECHO):
>
>	ping -c 4 203.0.178.191
>
>If you get no response, try tracerouting that host. Use `mtr' if you
>have it, otherwise `traceroute'. On Windows you can use `tracert' (seems
>they took UNIX command naming to heart ... heh):
>
>	traceroute 203.0.178.191
>
>If you /do/ get a response, try using `host' or (preferably) `dig' to
>resolve a hostname. On WinXP I think you can use `nslookup' but that's
>only a vague memory; failing that use ping with a hostname.
>
>	dig google.com
>
>or
>
>	host google.com
>
>If that fails, check that /etc/resolv.conf is correct (Linux). Also try:
>
>	dig @203.0.178.191 google.com
>
>to see if you get a correct response from a known-good outside DNS
>server (that you've already confirmed you can talk to at least with
>ping).
>
>If names resolve OK, try doing a manual HTTP request to a known-good
>host using telnet (nfi how to force XP's telnet to use a non-default
>port, so this is linux only):
>
>	telnet www.iinet.net.au 80
>
>you should see:
>
>	Trying 203.59.24.221...
>	Connected to www.iinet.net.au (203.59.24.221).
>	Escape character is '^]'.
>
>in which case type:
>
>	GET /
>
>If you get HTML, that's good. If not, well, something's wrong. Chances
>are you will have hit the problem before this, anyway. Post here with
>where it fails and the output up to the point it failed, and then we
>might actually have enough information to attempt to diagnose the
>problem.
>
>  
>
Just going further on what Craig has said, is the machine getting its 
wireless IP by DHCP from the router?

The reason I ask, is because I've seen networks where the IP of the WLAN 
is different to the IP of the machine or ADSL modem that is serving out 
the internet, and by using the Wireless AP's DHCP function it sets the 
WAP as the gateway. If thats the case, you'll need to manually set the 
gateway and / or DNS to be the machine that does the serving.

Hope that can help.

Cheers
-- 
*Daniel Pearson
*Flashware Solutions ABN 58 438 456 919
Mob: 0438 118 897  |  Email: daniel at flashware.net 
<mailto:daniel at flashware.net>

The information contained in this electronic transmission is 
confidential. If you are not the intended recipient of this 
transmission, use of this information is strictly prohibited.  If you 
have received this transmission in error, please contact Flashware 
Solutions 0438 118 897.