I remove some debian packages from amd64 pc. then I couldn't access to internet.
I use x86 pc and download those packages and install it. I could ping to www.yahoo.co.jp and access to x86 pc from amd64 pc by ssh. mind you, iceweasel and icedeove ware not be able to access to internet. but konqueror could.
I thought Oh my got. what's wrong? then I did check this 'dpkg -l | grep ^rc' cuz if some package has been removed I have to re-install it. I found libnss-mdns's state was rc. so I install it. then I have been able to access to internet wow.
I got this. icewheasel and icedeove need libnss-mdns. although konqueror doesn't.