Date: Wed, 17 Jul 2013 22:18:57 +0900 (JST) From: Hiroki Sato <hrs@FreeBSD.org> To: feld@FreeBSD.org Cc: freebsd-stable@FreeBSD.org, rkoberman@gmail.com, lukasz@wasikowski.net, dewayne.geraghty@heuristicsystems.com.au Subject: Re: ipv6_addrs_IF aliases in rc.conf(5) Message-ID: <20130717.221857.228051450632054039.hrs@allbsd.org> In-Reply-To: <1374062120.4532.140661256673649.36ED5B44@webmail.messagingengine.com> References: <14677223DB6D4CD48E880520725B3552@white> <20130717.183628.1254490649724740016.hrs@allbsd.org> <1374062120.4532.140661256673649.36ED5B44@webmail.messagingengine.com>
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Mark Felder <feld@freebsd.org> wrote
in <1374062120.4532.140661256673649.36ED5B44@webmail.messagingengine.com>:
fe> On Wed, Jul 17, 2013, at 4:36, Hiroki Sato wrote:
fe> >
fe> > The recommended way is ifconfig_IF_aliasN or ifconfig_IF_aliases.
fe> > ipv4_addr_IF will not be removed in the near future, but please use
fe> > ifconfig_IF_alias{N,es} for newly-configured systems. Backward
fe> > compatibility for not breaking the existing configurations will be
fe> > maintained as much as possible (even on the upcoming 10.0R and
fe> > later).
fe> >
fe>
fe> Almost everyone is familiar with ifconfig_IF_aliasN, but can you provide
fe> example syntax for ifconfig_IF_aliases ? I've never seen that before and
fe> can't find it documented.
I committed some descriptions about it to rc.conf(5) at the same
time. It is basically the same as ifconfig_IF_aliasN, but can have
multiple address specification. Both of ifconfig_IF_alias{N,es} now
supports range specification, so there is no difference in the
functionality. The following two examples give the same result:
ifconfig_ed0_alias0="inet 127.0.0.251 netmask 0xffffffff"
ifconfig_ed0_alias1="inet 127.0.0.252 netmask 0xffffffff"
ifconfig_ed0_alias2="inet 127.0.0.253 netmask 0xffffffff"
ifconfig_ed0_alias3="inet 127.0.0.254 netmask 0xffffffff"
ifconfig_ed0_aliases="\
inet 127.0.0.251 netmask 0xffffffff \
inet 127.0.0.252 netmask 0xffffffff \
inet 127.0.0.253 netmask 0xffffffff \
inet 127.0.0.254 netmask 0xffffffff \
"
The implementation actually converts values in the variables in
ifconfig_IF_aliasN, ipv6_ifconfig_IF_aliasN, and ipv4_addrs_IF into a
list of them in a consistent format (AF-keyword + address spec +
options) used in ifconfig_IF_aliases, and then it processes
ifconfig_IF_aliases and them.
ifconfig_IF_aliasN accepts address spec without address family
keyword for backward compatibility, but ifconfig_IF_aliases does not.
This is the difference between the two.
fe> This thread isn't exactly the proper forum to debate the future of
fe> network configuration on FreeBSD, but please take this into
fe> consideration. And thank you for your work on the rc.d scripts --
fe> they're the #1 reason many of us prefer working with FreeBSD.
Fair enough. Please do not hesitate to speak up on freebsd-rc@ for
this kind of topics.
-- Hiroki
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