Counldn't resolve host, how to reset the wifi?

Hi guys,

I connected edison to my iPhone hotspot via wifi the other day,

it worked fine and I could download / install things on edison.

Then, when I tried to install something with npm today, it keeps saying

getaddrinfo ENOTFOUND

I guess this is related to dns or host or something similar? So I googled..

I tried to ping www.google.com on edison, it says bad address,

Ping 74.125.24.103, it works.

I tried to curl http://registry.npmjs.org/npm, it says,

curl: (6) Couldn't resolve host 'registry.npmjs.org'

I tried to change /etc/resolv.conf, to add some dns server there,

but I don't know how I can get this file persisted on disk, right now I can not save my changes.

So now I wonder is there any way to reset the wifi configuration completely?

to reconfigure everything, including the ability for edison to resolve hostnames.

I tried configure_edison --wifi, still it doesn't resolve hostnames.

my edison version is:

edison-rel1-maint-weekly_build_16_2014-10-14_14-56-19

Thanks!

-Casper