[gentoo-user] eth0 fallback configuration is ignored

[gentoo-user] eth0 fallback configuration is ignored

[Jules Colding]

Hi,

My "/etc/conf.d/net" says:

config_eth0=( "dhcp" )
fallback_eth0=( "192.168.3.3/24" )
fallback_route_eth0=( "default via 192.168.3.1" )


But dhcpcd is ignoring this. Instead it is using
"/var/lib/dhcpcd/dhcpcd-eth0.info" to set eth0. This looks like the '-E'
option is used, but where? How can I make my fallback configuration
effective?

Thanks,
  jules



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Re: [gentoo-user] eth0 fallback configuration is ignored

[Iain Buchanan]

On Sat, 2007-10-27 at 13:48 +0200, Jules Colding wrote:
> Hi,
> 
> My "/etc/conf.d/net" says:
> 
> config_eth0=( "dhcp" )
> fallback_eth0=( "192.168.3.3/24" )
> fallback_route_eth0=( "default via 192.168.3.1" )
> 
> 
> But dhcpcd is ignoring this. Instead it is using
> "/var/lib/dhcpcd/dhcpcd-eth0.info" to set eth0. This looks like the '-E'
> option is used, but where? How can I make my fallback configuration
> effective?

is it by any chance assigning you a 169... address?  Did you recently
upgrade dhcpcd to ... around ... 3.1.6 I think?  Anyway, it now tries
"zeroconf" or whatever it's called, to give you an address when there's
no server around.  Personally I don't like it, but you can decide :)

If you read your elog messages you would have seen:

"You have installed dhcpcd with zeroconf support.
This means that it will always obtain an IP address even if no
DHCP server can be contacted, which will break any existing
failover support you may have configured in your net configuration.
This behaviour can be controlled with the -L flag.
See the dhcpcd man page for more details."

get rid of the zeroconf use flag or use -L.

HTH,
-- 
Iain Buchanan <iaindb at netspace dot net dot au>

In ancient China there is a legend that one day a child will be born
from a dragon, grow to be a man, and vanquish evil from the land. That
man is not Chuck Norris, because Chuck Norris killed that man. 

-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] eth0 fallback configuration is ignored

[Jules Colding]

Hi Iain,.

On Sat, 2007-10-27 at 21:58 +0930, Iain Buchanan wrote:
> On Sat, 2007-10-27 at 13:48 +0200, Jules Colding wrote:
> > Hi,
> > 
> > My "/etc/conf.d/net" says:
> > 
> > config_eth0=( "dhcp" )
> > fallback_eth0=( "192.168.3.3/24" )
> > fallback_route_eth0=( "default via 192.168.3.1" )
> > 
> > 
> > But dhcpcd is ignoring this. Instead it is using
> > "/var/lib/dhcpcd/dhcpcd-eth0.info" to set eth0. This looks like the '-E'
> > option is used, but where? How can I make my fallback configuration
> > effective?
> 
> is it by any chance assigning you a 169... address?  

Yes, indeed it is.


> Did you recently
> upgrade dhcpcd to ... around ... 3.1.6 I think? 

3.1.5-r1 actually.


>  Anyway, it now tries
> "zeroconf" or whatever it's called, to give you an address when there's
> no server around.  Personally I don't like it, but you can decide :)
> 
> If you read your elog messages you would have seen:
> 
> "You have installed dhcpcd with zeroconf support.
> This means that it will always obtain an IP address even if no
> DHCP server can be contacted, which will break any existing
> failover support you may have configured in your net configuration.
> This behaviour can be controlled with the -L flag.
> See the dhcpcd man page for more details."
> 
> get rid of the zeroconf use flag or use -L.


Thanks a lot, will do. I didn't catch that message.

Thanks,
  jules



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Re: [gentoo-user] eth0 fallback configuration is ignored

[Dan Farrell]

On Sat, 27 Oct 2007 21:58:11 +0930
Iain Buchanan <iaindb@netspace.net.au> wrote:

> is it by any chance assigning you a 169... address?  Did you recently
> upgrade dhcpcd to ... around ... 3.1.6 I think?  Anyway, it now tries
> "zeroconf" or whatever it's called, to give you an address when
> there's no server around.  Personally I don't like it, but you can
> decide :)

This behaviour is called APIPA (Automatic PRivate IP Addressing)
(from /etc/conf.d/net.example):
# APIPA is a module that tries to find a free address in the range
# Automatic Private IP Addressing (APIPA)
# use APIPA to find a free address in the range
# 	169.254.0.0-169.254.255.255

It provides DHCP-like functionality without a DHCP server.  Pretty
useless, unless you use it to configure all your IPs or a route for that
subnet.  
-- 
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Re: [gentoo-user] eth0 fallback configuration is ignored

[Mick]

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On Saturday 27 October 2007, Dan Farrell wrote:
> On Sat, 27 Oct 2007 21:58:11 +0930
>
> Iain Buchanan <iaindb@netspace.net.au> wrote:
> > is it by any chance assigning you a 169... address?  Did you recently
> > upgrade dhcpcd to ... around ... 3.1.6 I think?  Anyway, it now tries
> > "zeroconf" or whatever it's called, to give you an address when
> > there's no server around.  Personally I don't like it, but you can
> > decide :)
>
> This behaviour is called APIPA (Automatic PRivate IP Addressing)
> (from /etc/conf.d/net.example):
> # APIPA is a module that tries to find a free address in the range
> # Automatic Private IP Addressing (APIPA)
> # use APIPA to find a free address in the range
> # 	169.254.0.0-169.254.255.255
>
> It provides DHCP-like functionality without a DHCP server.  Pretty
> useless, unless you use it to configure all your IPs or a route for that
> subnet.

Even worse, if your DHCP server comes up later, your PC will still hold on to 
APIPA - not sure how this feature can be of any use to be honest, but most 
devices these days from MS Windows to PDAs tend to behave like this.
-- 
Regards,
Mick

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Re: [gentoo-user] eth0 fallback configuration is ignored

[Dan Farrell]

On Sun, 28 Oct 2007 12:19:13 +0000
Mick <michaelkintzios@gmail.com> wrote:

> On Saturday 27 October 2007, Dan Farrell wrote:
> > On Sat, 27 Oct 2007 21:58:11 +0930
> >
> > Iain Buchanan <iaindb@netspace.net.au> wrote:
> > > is it by any chance assigning you a 169... address?  Did you
> > > recently upgrade dhcpcd to ... around ... 3.1.6 I think?  Anyway,
> > > it now tries "zeroconf" or whatever it's called, to give you an
> > > address when there's no server around.  Personally I don't like
> > > it, but you can decide :)
> >
> > This behaviour is called APIPA (Automatic PRivate IP Addressing)
> > (from /etc/conf.d/net.example):
> > # APIPA is a module that tries to find a free address in the range
> > # Automatic Private IP Addressing (APIPA)
> > # use APIPA to find a free address in the range
> > # 	169.254.0.0-169.254.255.255
> >
> > It provides DHCP-like functionality without a DHCP server.  Pretty
> > useless, unless you use it to configure all your IPs or a route for
> > that subnet.
> 
> Even worse, if your DHCP server comes up later, your PC will still
> hold on to APIPA - not sure how this feature can be of any use to be
> honest, but most devices these days from MS Windows to PDAs tend to
> behave like this.

I was also wondering what kind of useful purpose this would serve.  I
am guessing that it would be enough for a network on one broadcast
domain, if there is no need for any routing information.  
-- 
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Re: [gentoo-user] eth0 fallback configuration is ignored

[Mick]

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On Sunday 28 October 2007, Dan Farrell wrote:
> On Sun, 28 Oct 2007 12:19:13 +0000
>
> Mick <michaelkintzios@gmail.com> wrote:
> > On Saturday 27 October 2007, Dan Farrell wrote:
> > > On Sat, 27 Oct 2007 21:58:11 +0930
> > >
> > > Iain Buchanan <iaindb@netspace.net.au> wrote:

> > > This behaviour is called APIPA (Automatic PRivate IP Addressing)
> > > (from /etc/conf.d/net.example):
> > > # APIPA is a module that tries to find a free address in the range
> > > # Automatic Private IP Addressing (APIPA)
> > > # use APIPA to find a free address in the range
> > > # 	169.254.0.0-169.254.255.255
> > >
> > > It provides DHCP-like functionality without a DHCP server.  Pretty
> > > useless, unless you use it to configure all your IPs or a route for
> > > that subnet.
> >
> > Even worse, if your DHCP server comes up later, your PC will still
> > hold on to APIPA - not sure how this feature can be of any use to be
> > honest, but most devices these days from MS Windows to PDAs tend to
> > behave like this.

Let me correct myself here: my Gentoo boxen behave like this.  A WinXP that I 
tested for this purpose does not.  It comes up with the APIPA address and 
when a router becomes available in the network later on, it readily obtains a 
dhcp address and drops the APIPA.  Any idea how to configure Gentoo to do the 
same?

> I was also wondering what kind of useful purpose this would serve.  I
> am guessing that it would be enough for a network on one broadcast
> domain, if there is no need for any routing information.

I am guessing that it is a way of getting two computers talking to each other 
when they find themselves connected, but without a router?
-- 
Regards,
Mick

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Re: [gentoo-user] eth0 fallback configuration is ignored

[Dan Farrell]

On Mon, 29 Oct 2007 07:51:52 +0000
Mick <michaelkintzios@gmail.com> wrote:

> Let me correct myself here: my Gentoo boxen behave like this.  A
> WinXP that I tested for this purpose does not.  It comes up with the
> APIPA address and when a router becomes available in the network
> later on, it readily obtains a dhcp address and drops the APIPA.  Any
> idea how to configure Gentoo to do the same?

I don't know, but as soon as you find out, let me know, OK?  

You could probably also set up a cron job to check every few seconds if
the IP address is an APIPA address, and if it is, send out some sort of
query to see if DHCP will work.

> > I was also wondering what kind of useful purpose this would serve.
> > I am guessing that it would be enough for a network on one broadcast
> > domain, if there is no need for any routing information.  
> 
> I am guessing that it is a way of getting two computers talking to
> each other when they find themselves connected, but without a router?
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] eth0 fallback configuration is ignored

[Mark Shields]

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On 10/29/07, Mick <michaelkintzios@gmail.com> wrote:
>
> On Sunday 28 October 2007, Dan Farrell wrote:
> > On Sun, 28 Oct 2007 12:19:13 +0000
> >
> > Mick <michaelkintzios@gmail.com> wrote:
> > > On Saturday 27 October 2007, Dan Farrell wrote:
> > > > On Sat, 27 Oct 2007 21:58:11 +0930
> > > >
> > > > Iain Buchanan <iaindb@netspace.net.au> wrote:
>
> > > > This behaviour is called APIPA (Automatic PRivate IP Addressing)
> > > > (from /etc/conf.d/net.example):
> > > > # APIPA is a module that tries to find a free address in the range
> > > > # Automatic Private IP Addressing (APIPA)
> > > > # use APIPA to find a free address in the range
> > > > #         169.254.0.0-169.254.255.255
> > > >
> > > > It provides DHCP-like functionality without a DHCP server.  Pretty
> > > > useless, unless you use it to configure all your IPs or a route for
> > > > that subnet.
> > >
> > > Even worse, if your DHCP server comes up later, your PC will still
> > > hold on to APIPA - not sure how this feature can be of any use to be
> > > honest, but most devices these days from MS Windows to PDAs tend to
> > > behave like this.
>
> Let me correct myself here: my Gentoo boxen behave like this.  A WinXP
> that I
> tested for this purpose does not.  It comes up with the APIPA address and
> when a router becomes available in the network later on, it readily
> obtains a
> dhcp address and drops the APIPA.  Any idea how to configure Gentoo to do
> the
> same?


I think ifplugd does this.

 eix ifplugd
* sys-apps/ifplugd
     Available versions:  0.28-r7 ~0.28-r8 {doc}
     Homepage:            http://0pointer.de/lennart/projects/ifplugd/
     Description:         Brings up/down ethernet ports automatically with
cable detection





-- 
- Mark Shields

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Re: [gentoo-user] eth0 fallback configuration is ignored

[Mick]

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On Tuesday 30 October 2007, Mark Shields wrote:
> On 10/29/07, Mick <michaelkintzios@gmail.com> wrote:
> > On Sunday 28 October 2007, Dan Farrell wrote:
> > > On Sun, 28 Oct 2007 12:19:13 +0000
> > >
> > > Mick <michaelkintzios@gmail.com> wrote:
> > > > On Saturday 27 October 2007, Dan Farrell wrote:
> > > > > On Sat, 27 Oct 2007 21:58:11 +0930
> > > > >
> > > > > Iain Buchanan <iaindb@netspace.net.au> wrote:
> > > > >
> > > > > This behaviour is called APIPA (Automatic PRivate IP Addressing)
> > > > > (from /etc/conf.d/net.example):
> > > > > # APIPA is a module that tries to find a free address in the range
> > > > > # Automatic Private IP Addressing (APIPA)
> > > > > # use APIPA to find a free address in the range
> > > > > #         169.254.0.0-169.254.255.255
> > > > >
> > > > > It provides DHCP-like functionality without a DHCP server.  Pretty
> > > > > useless, unless you use it to configure all your IPs or a route for
> > > > > that subnet.
> > > >
> > > > Even worse, if your DHCP server comes up later, your PC will still
> > > > hold on to APIPA - not sure how this feature can be of any use to be
> > > > honest, but most devices these days from MS Windows to PDAs tend to
> > > > behave like this.
> >
> > Let me correct myself here: my Gentoo boxen behave like this.  A WinXP
> > that I
> > tested for this purpose does not.  It comes up with the APIPA address and
> > when a router becomes available in the network later on, it readily
> > obtains a
> > dhcp address and drops the APIPA.  Any idea how to configure Gentoo to do
> > the
> > same?
>
> I think ifplugd does this.

Not on my laptop . . .  :(
-- 
Regards,
Mick

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