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Network Card Syntax ???

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Tails
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Network Card Syntax ???

#1 Post by Tails »

What's the sytax to set the network card to a specific speed/duplex setting in the /etc/network/interfaces file? Here's my current settings:

auto eth0
iface eth0 inet static
address x.x.x.x
netmask x.x.x.x
network x.x.x.x
broadcast x.x.x.x
gateway x.x.x.x

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miikkajo
Posts: 4
Joined: 2004-09-16 16:54

Re: Network Card Syntax ???

#2 Post by miikkajo »

you cannot specify speed and dublex from /etc/network/interfaces file

but there is few packages for that purpose:

mii-diag: contains mii-tool - manipulate media-independent interface status

nictools-nopci and
nictools-pci: contains tools for specific ethernet card type


example:

use mii-tool -F 100baseTx-FD eth0 to switch you nic to 100 full duplex mode

and

use mii-tool -F 100baseTx-HD eth0 to switch you nic to 100 half duplex mode
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Tails
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#3 Post by Tails »

Thanks miikkajo :)


Tails
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Guest

#4 Post by Guest »

> you cannot specify speed and dublex from /etc/network/interfaces file

Not true. See http://bugs.debian.org/256240 .
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Jeroen
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#5 Post by Jeroen »

Eh, please read that bug carefully. It is a _wishlist_ to be able to do so, and it is refused. So, indeed, it is not possible, and it also shouldn't, /etc/network/interfaces is for protocol configuration, it is not intended as a hardware level configuration tool.
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x
Posts: 4
Joined: 2004-09-14 23:32
Location: Chile

#6 Post by x »

You can run ethtool (or mii-tool) after the network card is brought up using the "up" option of the interfaces file, for example:

Code: Select all

auto eth0
iface eth0 inet static
address x.x.x.x
netmask x.x.x.x
network x.x.x.x
broadcast x.x.x.x
gateway x.x.x.x 
up ethtool -s eth0 speed 100 autoneg on
Xavier
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Devastator
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#7 Post by Devastator »

What would be the point of setting these values ?
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Guest

#8 Post by Guest »

Devastator wrote:What would be the point of setting these values ?
There is some (old) hardware that doesn't support autonegotiation, bad wiring doesn't allow 100 mpbs or sometimes autonegotiation fails.

Xavier
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Tails
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#9 Post by Tails »

Devastator wrote:What would be the point of setting these values ?
Because it's a habit that I set all my core servers NIC card settings to 100/Full and take autonegotiation out of the picture....:) Same with the switch side also. That way it's almost impossible to get a speed/duplex mismatch.


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sprucio
Posts: 143
Joined: 2005-03-29 03:30

#10 Post by sprucio »

This is a nice feature. I think I can safely say that most work environments that have high end switches will need this for full optimization.
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