I have noticed that doing a "sudo service network-manager restart"
usually fixes things, but not always and not for everything. For
instance, on my laptop at the moment firefox can't find any webpages
("Server not found"), but Chrome is working fine; ntpd is complaining
twice a minute in the log that it can't find 0.ubuntu.pool.ntp.org etc,
even though "nslookup 0.ubuntu.pool.ntp.org" gives a valid address;
"ping google.com" says "Name or service not known", even though
"nslookup google.com" returns a valid address. "dig google.com" is
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Name resolution stops working after resume from suspend
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