lists at wildgooses
Jun 30, 2012, 11:51 AM
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Documenting disabling IPV6 off
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Hi folks
Can we get some volunteers to write-up some ipv6 notes for the
gentoo/hardened docs
My quick notes would look as follows:
- What is ipv6, notes that it's basically a completely separate protocol
and might be unexpectedly enabled. Also discussion on link local vs
external ip addresses (quite a significant change from ipv4)
- Conditions to use it, eg enabling use flags AND noting that the
"listen" syntax is often different in the app of your choice, eg listen
[::} vs listen *
- Pointers on enabling external access to your machine (note I'm seeing
new providers turn on ipv6 every week, this is a fairly rapidly changing
situation now). ie enabling ipv6 tunnels, dhcpv6, autoconfig, etc
- How to disable ipv6. Sub notes:
a) iptables6 default drop (iptables -P)
b) iptables6 reject
# ip6tables -A INPUT -j DROP
# ip6tables -A OUTPUT -j DROP
# ip6tables -A FORWARD -j DROP
c) sysctl
d) blacklist kernel module or build kernel without support
e) kernel command line option (useful when not modular kernel)
"ipv6.disable=1"
f) Build specific apps without support (seems pointless though?)
g) Ensure specific apps only listen on ipv4 using config. Check using
"netstat -l"
Anyone care to kick that around for a bit, maybe pour some sauce on it?
Ed
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