Disable IPv6 by default.

[John Reiser]

> I use ipv6 daily.  why should i go through extra steps when having both 
> enabled does not hurt people with ipv4 only connections?

Perhaps you've heard of the recommended policy "turn off all unused services"?
Enabling IPv6 wastes RAM (several dozen pages) and is a security risk
when the only connections used are IPv4.

Just publicize the easy OFF switch:
----- /etc/modprobe.conf
alias net-pf-10 off
-----

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