Difference between revisions of "Binding Network Devices"

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You can manually force the assignment from a network card to what device comes up as (eth0, eth1 ...), you can manually edit this file:
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{{MessageBox|
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backgroundcolor = #faa|
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image =Warning.png|
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heading =WARNING|
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message = This is recommended only for advanced users, proceed with caution.}}
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= Step 1 =
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You can manually force the assignment from a network card to what device comes up as (eth0, eth1 ...), by changing the udev rules. You can manually edit this file:
  
 
             /etc/udev/rules.d/70-persistent-net.rules
 
             /etc/udev/rules.d/70-persistent-net.rules
  
This maps MAC address to device name. Example:
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This file maps MAC address to device name.
  
    SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1d:60:b5:43:66", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
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'''Example'''
    SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="5c:d9:98:af:21:43", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="et1"
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<small>
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SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1d:60:b5:43:66", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
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SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="5c:d9:98:af:21:43", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="et1"
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</small>
  
 
This file maps the card with MAC 00:1d:60:b5:43:66 to eth0 and the card with 5c:d9:98:af:21:43 to eth1.
 
This file maps the card with MAC 00:1d:60:b5:43:66 to eth0 and the card with 5c:d9:98:af:21:43 to eth1.
  
If you want to reverse the assignements, switch eth0 and eth1 at the end of the lines.
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If you want to reverse the assignments, switch eth0 and eth1 at the end of the entries. Or delete one of the entries.
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= Step 2 =
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You may need to also edit this configuration file as well:
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            /etc/sysconfig/network-scripts/ifcfg-eth0
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if it has the MAC address for the device in it (e.g. in a variable called HWADDR).
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'''Example'''
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            HWADDR=00:1d:60:b5:43:66
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You will need to adjust the HWADDR to match the MAC address of the card you wish to make eth0.  Note: if you wish to keep eth1 active, you may also have to edit ifcfg-ith1 as well.
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These changes will only take effect after a reboot or a restart of the network services.
  
Please exercise care. Improperly modifying this file may render your system without network or even not boot properly.
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'''Please exercise care. Improperly modifying these files may render your system without network or even not boot properly.'''

Latest revision as of 03:54, 17 August 2012

Warning.png WARNING
This is recommended only for advanced users, proceed with caution.



Step 1

You can manually force the assignment from a network card to what device comes up as (eth0, eth1 ...), by changing the udev rules. You can manually edit this file:

           /etc/udev/rules.d/70-persistent-net.rules

This file maps MAC address to device name.

Example

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1d:60:b5:43:66", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="5c:d9:98:af:21:43", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="et1"

This file maps the card with MAC 00:1d:60:b5:43:66 to eth0 and the card with 5c:d9:98:af:21:43 to eth1.

If you want to reverse the assignments, switch eth0 and eth1 at the end of the entries. Or delete one of the entries.

Step 2

You may need to also edit this configuration file as well:

           /etc/sysconfig/network-scripts/ifcfg-eth0

if it has the MAC address for the device in it (e.g. in a variable called HWADDR).

Example

           HWADDR=00:1d:60:b5:43:66

You will need to adjust the HWADDR to match the MAC address of the card you wish to make eth0. Note: if you wish to keep eth1 active, you may also have to edit ifcfg-ith1 as well.

These changes will only take effect after a reboot or a restart of the network services.

Please exercise care. Improperly modifying these files may render your system without network or even not boot properly.