The problem here is that - as it seems - some Access Points, routers,
etc., seem to give incorrect DNS-server IPs to non-windows clients (i.e.
under windows DHCP is working fine, the lease is acquired and the DNS
nameserver IPs are gotten - and they actually work, under linux - on the
very same machine - DHCP leases are acquired, DNS nameserver IPs are
gotten, but they *don't* work: one can ping 195.114.161.61, but not
www.google.pl).

I would like to suggest a work-around for this:
check this page out - http://www.opendns.com/, especially thsi sub-page:
http://www.opendns.com/start/

Why not add to the default /etc/dhcp3/dhclient.conf file a single line:
prepend domain-name-servers 208.67.220.220, 208.67.222.222;

(it has to be prepend, not append, as the DNS server IP gotten through
DHCP sometimes works, but returns invalid IPs for some hosts, like
en.archive.ubuntu.com)

This way, even if DNS nameservers supplied by DHCP server are bogus,
there will always be two working DNS nameservers available.

It definetely solved the problem for me and my friend.

-- 
No WLAN after boot of 6.10, works with manual ifup/ifdown
https://launchpad.net/bugs/69839

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