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Category: Networking
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There are not much free IPV4 addresses available any more and it will not take very long until a home user also has to use IPV6 addresses.

 
I found following pages helpful to get familiar with IPV6.
 

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Category: Networking
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I had bad network performance in my local network. I added following lines to /etc/sysctl.conf and disabled ipv6 and now everything works fine again:

net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.lo.disable_ipv6=1

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Category: Networking
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wget -q -O - checkip.dyndns.org|sed -e 's/.*Current IP Address: //' -e 's/<.*$//'
 
wget -q -O - ip http://ip1.dynupdate.no-ip.com/; cat ip