Hi everyone,

I have looked through a Debian book I have, as well as Google and archive
searches, but I can't figure out how to activate an ethernet interface on
Debian at boot time without assigning any IP address to it.

I have a system with eth0, eth1 and eth2. eth1 and eth2 have IP addresses,
and are defined in /etc/network/interfaces. eth0 is connected to a
monitoring switch port, so that I can run "tcpdump -i eth0 ...." to
capture traffic on the network.

I don't need any IP address on eth0, but I need it to be up. I can
manually run "ifconfig eth0 up", but I can't figure out how to do this
automatically at boot time. I have tried to put in the following
in /etc/network/interfaces:

auto eth0
iface eth0

However, ifup complains about incomplete parameters. Does anyone know the
correct way to solve this problem? Please keep in mind that I can already
do this from an /etc/rc.local script or somesuch, but I consider those
kind of solutions to be a hack, and I prefer to do things the
way "proper" way, ie. using the distro's scripts.

TIA,

--
Anand


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Anand Buddhdev wrote:
> Hi everyone,
>
> I have looked through a Debian book I have, as well as Google and archive
> searches, but I can't figure out how to activate an ethernet interface on
> Debian at boot time without assigning any IP address to it.
>
> I have a system with eth0, eth1 and eth2. eth1 and eth2 have IP addresses,
> and are defined in /etc/network/interfaces. eth0 is connected to a
> monitoring switch port, so that I can run "tcpdump -i eth0 ...." to
> capture traffic on the network.
>
> I don't need any IP address on eth0, but I need it to be up. I can
> manually run "ifconfig eth0 up", but I can't figure out how to do this
> automatically at boot time. I have tried to put in the following
> in /etc/network/interfaces:
>
> auto eth0
> iface eth0
>
> However, ifup complains about incomplete parameters. Does anyone know the
> correct way to solve this problem? Please keep in mind that I can already
> do this from an /etc/rc.local script or somesuch, but I consider those
> kind of solutions to be a hack, and I prefer to do things the
> way "proper" way, ie. using the distro's scripts.
>
> TIA,
>

Greetings Anand:

in /etc/network/interfaces:


auto eth0
iface eth0 inet manual

The manual method is described in the manpage "interfaces"

- -Scott

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Le vendredi 23 février 2007 17:40, Scott Reese a écrit:
> Anand Buddhdev wrote:
[...]
> in /etc/network/interfaces:
>
> auto eth0
> iface eth0 inet manual
>
> The manual method is described in the manpage "interfaces"
>
> -Scott

I had to add "up ifconfig eth0 up" or it doesn't came up.

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auto eth0
iface eth0 inet manual

Or else try to configure as 'static' with address '0.0.0.0'.


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On 23/02/07 17:40, Scott Reese wrote:

Hello Scott,

>> I don't need any IP address on eth0, but I need it to be up. I can
>> manually run "ifconfig eth0 up", but I can't figure out how to do this
>> automatically at boot time. I have tried to put in the following
>> in /etc/network/interfaces:
>>
>> auto eth0
>> iface eth0
>>
>> However, ifup complains about incomplete parameters. Does anyone know the
>> correct way to solve this problem? Please keep in mind that I can already
>> do this from an /etc/rc.local script or somesuch, but I consider those
>> kind of solutions to be a hack, and I prefer to do things the
>> way "proper" way, ie. using the distro's scripts.
>
> in /etc/network/interfaces:
>
> auto eth0
> iface eth0 inet manual
>
> The manual method is described in the manpage "interfaces"

Thank you for your advice.

The "manual" method is not described in the man page for "interfaces" on
this system that I have. It may be because it's running Debian 3.0. I
will probably use some kind of entry in /etc/rc.boot to get this working
at boot time.

Regards,

--
Anand


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