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Re: need to disable IPv6

In article <>,
Anne Bennett  <> wrote:
>I can't believe that a Google search doesn't reveal this for me,
>but how do I disable IPv6 on NetBSD 5.1?  I've read /etc/defaults/rc.conf,
>the ifconfig manpage, the description summaries for sysctl settings,
>the /etc/rc.d/network script...  I still haven't figured it out.
>Obviously I'd rather not remove kernel support altogether.
>As of early June, one of my automated jobs (to retrieve my contact
>list from Google) stopped working with "no route to host"; fortunately
>I remembered that this was just around "IPv6 Day", and I was able
>to get it working again by telling a Perl module to use my IPv4
>address as the connection origin.
>Now I can't use Google Maps at all (with Firefox), and I'm wondering
>if it's another IPv6 problem.
>For some time (months? years?) postfix has been trying and failing
>to connect via IPv6 when a AAAA record is advertised, but since it
>falls back to the A record, it hasn't caused a serious problem.
>Since my machine is behind an IPv4 NAT gateway, I can't speak IPv6 to
>the outside world.  How, how, how do I turn it off, at least for the
>external interface?  At the moment, ifconfig reports:
>  fwip0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
>          address: 00:11:d8:00:00:f3:a9:66
>  fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>          address: 00:18:f3:ad:85:bd
>          media: Ethernet autoselect (10baseT)
>          status: active
>          inet netmask 0xffffff00 broadcast
>          inet6 fe80::218:f3ff:fead:85bd%fxp0 prefixlen 64 scopeid 0x2
>  lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33192
>          inet netmask 0xff000000
>          inet6 ::1 prefixlen 128
>          inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3

An easy way is to run your own caching name server and specify -4 on
the command line. This way, you won't get any v6 addresses :-)


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