Re: [SLUG] linksys and ip address.

From: Chris Mathey (slug@mathey.org)
Date: Sat Feb 04 2006 - 09:06:44 EST


William Coulter wrote:
> I have Charter internet service that is a cable modem. I have a linksys router and I connect a
> linux pc all the time, but I use a w2k pc because all of my certification software is for a
> windows pc. I don't understand why sometimes I turn on ether linux or w2k and I can't connect to
> the internet.
>
> In linux I have tried to use ifconfig to bring eth0 down and then up but nothing happens. In
> w2k, I used the ipconfig /renew to get a new ip address, but it can't find anything to get an ip
> address.
>
> In the router I have the standard router name, with no host and domain name. I have local DHCP
> on, but I only use a few address with a client lease time of 1 day. That is the default. Should
> I turn off local DHCP and asign each pc a static ip?
>
> However, I have found a way to resolve this issue but I don't like it. What I do is, I have to
> turn off the pcs and the router and then wait for a minute and turn on the router and then the pc
> of my choice. This is very, very anoying and it has come more often recently. I hope that I have
> given you enough info to help.
>
> William

When you say connect to the internet I assume load a web page\check
email. I assume you have checked all your cabling and verified link
speed\duplex of the NIC\switch
When this issue is happening what is the result of pinging the gateway
from the working and nonworking machine? (probably 192.168.1.1 for linksys)

If both can ping the gateway then on the windows maching do an ipconfig
/all or check resolv.conf on linux mainly I want you to ping the DNS
server. This will prove that both can can route outside the local area
network which is the first thing you want to verify.

If you cannot ping the gateway then on the machine that is not working,
(windows "arp -a" \linux "arp" ) see if the MAC address of the gateway
is there.

if the above test is good than you have good layer 3 connectivity.
if you are missing MAC address in the arp table after pinging than you
have might have physical issues.

make sure your linksys is running the latest code for your model.

Let us know the outcome of the ping test and we can proceed to
troubleshoot.

-Chris

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