HELP! Network status changes randomly, how to diagnose?

I am trying to connect my Gentoo computer to my D-Link
DVG-1120 (VoIP
Gateway with NAT) again after 3 months. It used to work
great, but now
the network status is changing randomly. Sometimes I can
load a webpage,
but then when I click on a link I get an error message. Then
it may
suddenly work again. The Internet connection to the gateway
works fine
and I can make phonecalls with the phones that are connected
to it. It
is the link to the computer that is broken. The computer
works when
connected directly to the internet and the cable works
perfectly too
(tested elsewhere). I see that it is changing randomly by
executing the
command
    ifconfig eth0|grep "inet addr:"
repeateldy. Sometimes I get nothing, sometimes I get:
          inet addr:192.168.0.46  Bcast:192.168.0.255 
Mask:255.255.255.0
It looks random. What can I do about it? Is there some
software for
analyzing it?


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