IPv6/Configuration
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This page provides information about configuring IPv6 on Gentoo. For general information about IPv6, please refer to the IPv6 page.
When IPv6 is not used or required
Systems that don't use or require IPv6, and thus want to prioritise IPv4 over IPv6, can be configured to reflect this by modifying the /etc/gai.conf file.
Uncomment the IPv6 precedence lines, and change the final line to have a value of "100" rather than "10":[1]
FILE
/etc/gai.confprecedence ::1/128 50
precedence ::/0 40
precedence 2002::/16 30
precedence ::/96 20
precedence ::ffff:0:0/96 100
Note that it is not sufficient to only uncomment one of these lines; if one of these lines is uncommented, all need to be uncommented, otherwise glibc's getaddrinfo(3) won't work properly.[2]
Details about the /etc/gai.conf file can be found in the gai.conf(5) man page.
IPv6 tunnels
Refer to the IPv6 tunnels page.
Tools
| Package | Description |
|---|---|
| net-misc/ipcalc | IP Calculator prints broadcast/network/etc for an IP address and netmask |
| net-misc/ipv6calc | IPv6 address calculator, which can convert an IPv4 address to a 6to4 address. |
| net-misc/sipcalc | Advanced console-based IPv4/IPv6 subnet calculator |