Deciphering system.log to diagnose a network problem

ok here goes, about a week ago my old d-link router (DI-624+) just died, wouldn't turn on or anything, so off i went to get a new one, got a new d-link since other than dying (after like 3 years i should add) it had been pretty reliable.
set it up and all was well, except in the pst couple of days I have been seeing some odd behaviour. The wireless would drop out only to be reacquired a few seconds later (the wireless icon in the menu bar seemed to indicate the wireless was still up). after a while this became very very annoyingso i decided to plug in my Macbook using a good ol' cat5e cable. lo and behold I was having the same problem, connection drops, then reacquires.
I decided to dig about system.log and have noticed the following being repeated about avery 45 secs to a minute:
Jan 13 11:17:05 robin-tibbss-macbook kernel[0]: vmnet: bridge-en0: up
Jan 13 11:17:06 robin-tibbss-macbook mDNSResponder[15]: SetupAddr invalid sa_family 0
Jan 13 11:17:08 robin-tibbss-macbook mDNSResponder[15]: SetupAddr invalid sa_family 0
Jan 13 11:18:52 robin-tibbss-macbook kernel[0]: vmnet: bridge-en0: interface en is coming UP
Jan 13 11:18:52 robin-tibbss-macbook kernel[0]: AppleYukon2 - en0 link active, 100-Mbit, full duplex, flow control disabled port 0
is this normal or abnormal? something odd is that I don't see the interface going down, hmm. also I've noticed that when I am having problems like I describe, that in the Network pane of system prefs the interface that I am currently connecting to the router through shows as having a 'self assigned' IP address.
any thoughts, i guess it could be the router, just wanted to ask for advice here first, and yes the connection is fine when plugged directly into the cable modem. many thanks in advance.

Hi, Robin
Look, I don't know if you're still monitoring this thread, since it's over four months old at this point, but I was having some issues not unlike yours, and with similar mDNSResponder log entries.
For what it's worth, I think this: robin-tibbss-macbook kernel[0]: vmnet: bridge-en0: up
might be what Leopard just can't stand. I've noticed an increase in wifi drops and slowdowns since installing VMWare (which I love, BTW - VMWare FTW!).
My guess - Leo doesn't play nice with virtual network adapters just yet - see also all the threads related to VPN drops and login issues.
Hope this at least gives you some context to the problem
God Bless,
~a

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