On Tue, May 11, 2010 at 03:09:37PM +0530, Siju George wrote:
> On Tue, May 11, 2010 at 12:29 PM, Claudio Jeker
> <[email protected]> wrote:
> >
> > Try using a cross-over cable.
> >
> 
> Thanks for the idea Claudio.
> 
> The cross over cable does not work either.
> 

You might have auto-negotiation problems, try to force a different
mode.  i guess that 100 full-duplex should work.  also try to use a
cable that is at least 2m long.

# ifconfig em0 media 100baseTx mediaopt full-duplex

or to list the available options for your NIC:

# ifconfig em0 media

> Whatis amazing for me is that it can be connected to a laptop but not
> to a desktop computer?
> It connects to a Windows XP laptop and I can connect to the internet
> but it will not show link up if I connect it to a Windows XP desktop
> or a linux desktop or my OpenBSD firewall.
> 

try to figure out the link speed that windows is using to connect to
the modem.  but i don't know a way to figure out the duplex state on
windows.

> The ISP told us that it should be given to some device like fortigate

you should change the ISP for giving such a misleading advise.

reyk

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