new weird wireless problem?

anyone seen this? MBP, 10.5.2, has been working fine up until last
week. Now, on return from sleep, the (wireless) internet connection's
hosed. It's on Sky BB, if it makes a difference using their sky-
branded Netgear 834 router.
Symptoms: on wake from sleep, wireless shows connected. Can open my
router admin page via browser fine. However, no internet, and the
weirdest thing is pinging the router, which I am happily logged into
checking the settings, fails with "no route to host". Hmm.
After a minute or two of messing about with turning off/on airport/
pinging stuff it pings back into life at some point.

Given XP machines in the house are fine, this MBP's fine running XP
via bootcamp, I'm a bit confused. Signal strength showing fine, IP
being dished out via DHCP OK, router browsable. I'm using public DNS
servers at 4.2.2.2 and I'm buggered if I can explain it unless it's
just some weird Leopard behaviour that's waited 6 months to present
itself.

Anyone?
.

Relevant Pages

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