Difference between revisions of "Binding Network Devices"
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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: | 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: | ||
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This file maps MAC address to device name. | This file maps MAC address to device name. | ||
| − | =Example= | + | ==Example== |
<small> | <small> | ||
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}=="00:1d:60:b5:43:66", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0" | ||
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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. | 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 | /etc/sysconfig/network-scripts/ifcfg-eth0 | ||
| − | =Example= | + | if it has the MAC address for the device in it (e.g. in a variable called HWADDR). |
| + | |||
| + | ==Example== | ||
<small> | <small> | ||
HWADDR=00:1d:60:b5:43:66 | HWADDR=00:1d:60:b5:43:66 | ||
</small> | </small> | ||
| − | 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 | + | 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. | + | These changes will only take effect after a reboot or a restart of the network services. |
| − | '''Please exercise care. Improperly modifying these | + | '''Please exercise care. Improperly modifying these files may render your system without network or even not boot properly.''' |
Revision as of 03:52, 17 August 2012
Contents
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.
