rc.conf changes IPV6

Doug Barton dougb at FreeBSD.org
Tue Nov 22 01:43:18 UTC 2011

On 11/21/2011 17:39, Dan The Man wrote:
> On Mon, 21 Nov 2011, Stefan Bethke wrote:
>> Am 21.11.2011 um 20:25 schrieb Dan The Man:
>>> I notice we have changed way IPV6 is done in rc.conf now.
>>> I assume someone will update:
>>> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/network-ipv6.html
>>> My question now concerns aliases, and what the norm will end up being.
>>> Here is example below:
>>> Here we have the new layout with IPV6, the below works fine, however
>>> since
>>> the ifconfig lines for IPV4 and IPV6 are essentially the same other
>>> than the actual "inet" and "inet6", will it be ok to start with
>>> alias0 for both IPV4 and IPV6, or should I in this example be
>>> starting at alias4 for IPV6?
>>> I would like idea to keep it way it is each protocal starting at alias0.
>>> defaultrouter=""
>>> hostname="sunsaturn.com"
>>> #IPV4
>>> ifconfig_em1="inet netmask"
>>> ifconfig_em1_alias0="inet netmask"
>>> ifconfig_em1_alias1="inet netmask"
>>> ifconfig_em1_alias2="inet netmask"
>>> ifconfig_em1_alias3="inet netmask"
>>> #IPV6
>>> ipv6_activate_all_interfaces="YES"
>>> ipv6_network_interfaces="em1"
>>> ipv6_defaultrouter="2001:49f0:4004:0000:0000:0000:0000:0001"
>>> ifconfig_em1_ipv6="inet6 2001:49f0:4004:0000:0000:0000:0000:0002
>>> prefixlen 48"
>>> ifconfig_em1_alias0="inet6 2001:49f0:4004:0000:0000:0000:0000:0003
>>> prefixlen 48"
>>> ifconfig_em1_alias1="inet6 2001:49f0:4004:0000:0000:0000:0000:0004
>>> prefixlen 48"
>> Remember that rc.conf follows shell syntax and sematics, so the second
>> _alias0 and _alias1 will overwrite the previous ones.
>> In 9.0 you can use the ipv4_addrs_<ifname> variable to set both the
>> IPv4 "main" address as well as "alias" addresses, see rc.conf(5). 
>> There doesn't seem to be an equivalent IPv6 option, as best as I can
>> tell.
> You would assume so Stefan, that the duplicate alias0 would overwrite,
> but it seems since ifconfig separates the namespace for IPV4/IPV6 it
> actually works.

I don't see how that could possibly be true, how have you tested it?



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