Bugzilla Bug 102209

wget(1):
       --prefer-family=IPv4/IPv6/none
           When given a choice of several addresses, connect to the addresses
           with specified address family first.  IPv4 addresses are preferred
           by default.


Reproducible: Always
Steps to Reproduce:
1. wget
http://ftp.belnet.be/mirror/rsync.gentoo.org/gentoo/distfiles/linux-2.6.12.tar.bz2


Actual Results:  
Resolving ftp.belnet.be... 193.190.198.20, 2001:6a8:3c80:0:203:baff:fe39:f931
Connecting to ftp.belnet.be|193.190.198.20|:80... connected.


Expected Results:  
Resolving ftp.belnet.be...
2001:6a8:3c80:0:203:baff:fe39:f931, 193.190.198.20
Connecting to ftp.belnet.be|2001:6a8:3c80:0:203:baff:fe39:f931|:80... connected.


When the USE flag 'ipv6' is enabled, the following line should be added to
/etc/wget/wgetrc:

prefer_family = IPv6

(In reply to comment #0)
> When the USE flag 'ipv6' is enabled, the following line should be added to
> /etc/wget/wgetrc:
> 
> prefer_family = IPv6

Uh, that would make quite a couple of people angry, ipv6 use flags is enabled
*by default* in most profiles while most people don't have IPv6 connectivity at
all. I  vote for WONTFIX unless ipv6 is removed from make.defaults.

Preferring IPv6 does not break IPv4 connections, and this would only have an
effect for services available over IPv6 as well as IPv4.

Example with ::/0 default route via eth0 (I have no idea why the Linux kernel
does this on startup):
Resolving ftp.belnet.be... 2001:6a8:3c80:0:203:baff:fe39:f931, 193.190.198.20
Connecting to ftp.belnet.be|2001:6a8:3c80:0:203:baff:fe39:f931|:80... failed:
Cannot assign requested address.
Connecting to ftp.belnet.be|193.190.198.20|:80... connected.

Example with unreachable ::/0 route:
Resolving ftp.belnet.be... 2001:6a8:3c80:0:203:baff:fe39:f931, 193.190.198.20
Connecting to ftp.belnet.be|2001:6a8:3c80:0:203:baff:fe39:f931|:80... failed:
Network is unreachable.
Connecting to ftp.belnet.be|193.190.198.20|:80... connected.

(In reply to comment #2)

> Resolving ftp.belnet.be... 2001:6a8:3c80:0:203:baff:fe39:f931, 193.190.198.20
> Connecting to ftp.belnet.be|2001:6a8:3c80:0:203:baff:fe39:f931|:80... failed:
> Network is unreachable.
> Connecting to ftp.belnet.be|193.190.198.20|:80... connected.

Yes, that's what I'm talking about, resolving IPv6 address on IPv4 connection
would make people confused and angry. IPv6 users can easily set that themselves,
but this is IMHO a really bad default for all users (again, ipv6 is default use
flag in Gentoo).

(In reply to comment #3)
> Yes, that's what I'm talking about, resolving IPv6 address on IPv4 connection
> would make people confused and angry. IPv6 users can easily set that themselves,
> but this is IMHO a really bad default for all users (again, ipv6 is default use
> flag in Gentoo).

Maybe the ebuild needs to display a warning that people are easily confused and
that IPv6 support needs to be enabled manually despite the use flag already
being enabled?

Just remember, ipv6 can only be spread by being used... :-)

I added a comment in the wgetrc file about this.  Please remerge to see.