Hi,
I got a feature request for preventing taking down an interface on
shutdown. I wonder how we should implement this.
Option 1:
set RC_NETDOWN=no in /etc/rc.conf (or /etc/conf.d/networking) will
prevent taking down all the network interface on shutdown. No support
for preventing individual interfaces - its all or nothing.
Option 2:
Use a blacklist (eg RC_PREVENT_NETDOWN) of interfaces to not take
down. For example: RC_PREVENT_NETDOWN="eth0 eth3" will take down eth1
and eth2 but not eth0 and eth3. If set to 'all', all interfaces will
be kept up and if set to 'none' all interfaces will be taken down.
Deafult would be 'none'.
Alternative variable names are: RC_NET_KEEP_UP
Option 3:
Use a whitelist of interfaces to take down on shutdown. For example
RC_NETDOWN="eth1 eth2" will keep eth0 and eth3 up on shutdown. If set
to 'all' then all interfaces will be taken down and if set to 'none',
all interfaces will be kept up on shutdown. Default would be 'all'.
What do you prefer? They are all very simple to implement.
What are good variable names?
-nc
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Hi,
I cant understand how useful it is but, in my opinion, Option 3 (with
default as 'all') makes more sense. With Option 3 who doesnt want/know this
feature will never worry about it.
:wq!
On Thu, Aug 1, 2013 at 3:31 AM, Natanael Copa <ncopa@alpinelinux.org> wrote:
> Hi,>> I got a feature request for preventing taking down an interface on> shutdown. I wonder how we should implement this.>> Option 1:>> set RC_NETDOWN=no in /etc/rc.conf (or /etc/conf.d/networking) will> prevent taking down all the network interface on shutdown. No support> for preventing individual interfaces - its all or nothing.>>> Option 2:>> Use a blacklist (eg RC_PREVENT_NETDOWN) of interfaces to not take> down. For example: RC_PREVENT_NETDOWN="eth0 eth3" will take down eth1> and eth2 but not eth0 and eth3. If set to 'all', all interfaces will> be kept up and if set to 'none' all interfaces will be taken down.> Deafult would be 'none'.>> Alternative variable names are: RC_NET_KEEP_UP>>> Option 3:>> Use a whitelist of interfaces to take down on shutdown. For example> RC_NETDOWN="eth1 eth2" will keep eth0 and eth3 up on shutdown. If set> to 'all' then all interfaces will be taken down and if set to 'none',> all interfaces will be kept up on shutdown. Default would be 'all'.>>> What do you prefer? They are all very simple to implement.>> What are good variable names?>> -nc>>> ---> Unsubscribe: alpine-devel+unsubscribe@lists.alpinelinux.org> Help: alpine-devel+help@lists.alpinelinux.org> --->>
--
Atenciosamente,
Alan MeC Lacerda
Tecnólogo em Redes de Computadores
CCNA / LPIC-1 / CLA
http://alanlacerda.blogspot.com/
"-"-"-"-"-"-" Of course it runs NetBSD "-"-"-"-"-"-"
“Somente após a última árvore ser cortada.
Somente após o último rio ser envenenado.
Somente após o último peixe ser pescado.
Somente então o homem descobrirá que dinheiro não pode ser comido!!” -
Provérbio Cree (uma tribo indígena norte-americana)
On Thu, Aug 1, 2013 at 1:31 AM, Natanael Copa <ncopa@alpinelinux.org> wrote:
> I got a feature request for preventing taking down an interface on> shutdown. I wonder how we should implement this.
Since /etc/network/interfaces specifies which interfaces come up automatically,
wouldn't that be a good place to specify which ones come down automatically?
> They are all very simple to implement.
Not sure about this one.
- Jeff
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Hi,
Option 2 makes more sense now... And I think one of this would be used:
> RC_NO_NETDOWN
Or
> RC_KEEP_NET
:wq!
----
Alan Messias Cordeiro
Enviado pelo meu iPad
On 02/08/2013, at 03:52, Natanael Copa <ncopa@alpinelinux.org> wrote:
> On Thu, 1 Aug 2013 13:32:56 -0300> Alan Messias <alancordeiro@gmail.com> wrote:> >> Hi,>> >> I cant understand how useful it is but, in my opinion, Option 3 (with>> default as 'all') makes more sense. With Option 3 who doesnt want/know this>> feature will never worry about it.>> >> :wq!> > I didn't know that there was a need for this kind either til yesterday.> I think its used in some WOL scenarios, but i dont know why it might be> needed. (ah it just made sense, i suppose the switch keeps the ip/mac> mapping in its arp table, so you can WOL on IP instead of mac addr...> or something like that. If you take down the iface you tell the switch> to clear the ip from its arp table.)> > I was thinking more of option 2. Also with this option, people who> don't need this will never know that it exists and people who needs it> will need to list which devices they want it on (rather than a list of> devices they dont want this feature for).> > Option 2 also means that if you use this feature, and additional net> interface is added, the new interface will by default be taken down,> even if some other device is configured to stay up on shutdown. With> option 3, if you add an interface, it will be kept up unless you> manually add it to RC_NETDOWN)> > I just feel that RC_PREVENT_NETDOWN, sounds weird :)> > RC_NO_NETDOWN?> > RC_KEEP_NET?> > RC_KEEP_IP?> > RC_NO_IFDOWN?> > > -nc> >> On Thu, Aug 1, 2013 at 3:31 AM, Natanael Copa <ncopa@alpinelinux.org> wrote:>> >>> Hi,>>> >>> I got a feature request for preventing taking down an interface on>>> shutdown. I wonder how we should implement this.>>> >>> Option 1:>>> >>> set RC_NETDOWN=no in /etc/rc.conf (or /etc/conf.d/networking) will>>> prevent taking down all the network interface on shutdown. No support>>> for preventing individual interfaces - its all or nothing.>>> >>> >>> Option 2:>>> >>> Use a blacklist (eg RC_PREVENT_NETDOWN) of interfaces to not take>>> down. For example: RC_PREVENT_NETDOWN="eth0 eth3" will take down eth1>>> and eth2 but not eth0 and eth3. If set to 'all', all interfaces will>>> be kept up and if set to 'none' all interfaces will be taken down.>>> Deafult would be 'none'.>>> >>> Alternative variable names are: RC_NET_KEEP_UP>>> >>> >>> Option 3:>>> >>> Use a whitelist of interfaces to take down on shutdown. For example>>> RC_NETDOWN="eth1 eth2" will keep eth0 and eth3 up on shutdown. If set>>> to 'all' then all interfaces will be taken down and if set to 'none',>>> all interfaces will be kept up on shutdown. Default would be 'all'.>>> >>> >>> What do you prefer? They are all very simple to implement.>>> >>> What are good variable names?>>> >>> -nc>>> >>> >>> --->>> Unsubscribe: alpine-devel+unsubscribe@lists.alpinelinux.org>>> Help: alpine-devel+help@lists.alpinelinux.org>>> --->>> >>> >> >> >
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On Thu, 1 Aug 2013 13:32:56 -0300
Alan Messias <alancordeiro@gmail.com> wrote:
> Hi,> > I cant understand how useful it is but, in my opinion, Option 3 (with> default as 'all') makes more sense. With Option 3 who doesnt want/know this> feature will never worry about it.> > :wq!
I didn't know that there was a need for this kind either til yesterday.
I think its used in some WOL scenarios, but i dont know why it might be
needed. (ah it just made sense, i suppose the switch keeps the ip/mac
mapping in its arp table, so you can WOL on IP instead of mac addr...
or something like that. If you take down the iface you tell the switch
to clear the ip from its arp table.)
I was thinking more of option 2. Also with this option, people who
don't need this will never know that it exists and people who needs it
will need to list which devices they want it on (rather than a list of
devices they dont want this feature for).
Option 2 also means that if you use this feature, and additional net
interface is added, the new interface will by default be taken down,
even if some other device is configured to stay up on shutdown. With
option 3, if you add an interface, it will be kept up unless you
manually add it to RC_NETDOWN)
I just feel that RC_PREVENT_NETDOWN, sounds weird :)
RC_NO_NETDOWN?
RC_KEEP_NET?
RC_KEEP_IP?
RC_NO_IFDOWN?
-nc
> On Thu, Aug 1, 2013 at 3:31 AM, Natanael Copa <ncopa@alpinelinux.org> wrote:> > > Hi,> >> > I got a feature request for preventing taking down an interface on> > shutdown. I wonder how we should implement this.> >> > Option 1:> >> > set RC_NETDOWN=no in /etc/rc.conf (or /etc/conf.d/networking) will> > prevent taking down all the network interface on shutdown. No support> > for preventing individual interfaces - its all or nothing.> >> >> > Option 2:> >> > Use a blacklist (eg RC_PREVENT_NETDOWN) of interfaces to not take> > down. For example: RC_PREVENT_NETDOWN="eth0 eth3" will take down eth1> > and eth2 but not eth0 and eth3. If set to 'all', all interfaces will> > be kept up and if set to 'none' all interfaces will be taken down.> > Deafult would be 'none'.> >> > Alternative variable names are: RC_NET_KEEP_UP> >> >> > Option 3:> >> > Use a whitelist of interfaces to take down on shutdown. For example> > RC_NETDOWN="eth1 eth2" will keep eth0 and eth3 up on shutdown. If set> > to 'all' then all interfaces will be taken down and if set to 'none',> > all interfaces will be kept up on shutdown. Default would be 'all'.> >> >> > What do you prefer? They are all very simple to implement.> >> > What are good variable names?> >> > -nc> >> >> > ---> > Unsubscribe: alpine-devel+unsubscribe@lists.alpinelinux.org> > Help: alpine-devel+help@lists.alpinelinux.org> > ---> >> >> >
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On Fri, 2 Aug 2013 07:34:28 -0500
Jeff Pohlmeyer <yetanothergeek@gmail.com> wrote:
> On Thu, Aug 1, 2013 at 1:31 AM, Natanael Copa <ncopa@alpinelinux.org> wrote:> > > I got a feature request for preventing taking down an interface on> > shutdown. I wonder how we should implement this.> > Since /etc/network/interfaces specifies which interfaces come up automatically,> wouldn't that be a good place to specify which ones come down automatically?
thats actually a good point. we should check what Debian does here.
-nc
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On Fri, 2 Aug 2013 16:13:06 +0200
Natanael Copa <ncopa@alpinelinux.org> wrote:
> On Fri, 2 Aug 2013 07:34:28 -0500> Jeff Pohlmeyer <yetanothergeek@gmail.com> wrote:> > > On Thu, Aug 1, 2013 at 1:31 AM, Natanael Copa <ncopa@alpinelinux.org> wrote:> > > > > I got a feature request for preventing taking down an interface on> > > shutdown. I wonder how we should implement this.> > > > Since /etc/network/interfaces specifies which interfaces come up automatically,> > wouldn't that be a good place to specify which ones come down automatically?> > thats actually a good point. we should check what Debian does here.
They set NETDOWN=no in /etc/default/halt (corresponds to /etc/conf.d/halt)
I tend to agree that it makes sense to have a 'nodown eth0' or
similar in /etc/network/interfaces. But that should they do upstream.
(ifup/ifdown comes from debian)
-nc
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