[systemd-devel] Rename NIC by using dynamic MAC

[Kaesbauer Michael]

Hi,

up to now I found no way to write an udev rule which renames a specific NIC by using a MAC address that is returned by a bash script. The reason for getting the MAC address by the bash script is that the renaming NIC rule should be applied to different CPUs (with different MACs).


Here is my udev rule: /etc/udev/rules.d/81-net-rename.rules

SUBSYSTEM!="net", GOTO="net_name_slot_end"
ACTION!="add|change", GOTO="net_name_slot_end"
KERNEL=="*", ATTR{type}=="1", PROGRAM="/bin/getMAC_DHCP.sh", ATTR{address}=="%c", NAME="net0"
LABEL="net_name_slot_end"


Here is my bash script:

#!/bin/bash

NIC_ID=
MACS=(`cat /sys/class/net/*/address`)

len=${#MACS[*]}

NIC_CNT=0
for ((i=0; i != len; i++)); do
mac_str=${MACS[$i]}
if [ $mac_str != "00:00:00:00:00:00" ]; then
  let NIC_CNT=$NIC_CNT+1
fi
done

if [ $NIC_CNT -eq 2 ]; then
  NIC_ID="enp1s0"
fi
if [ $NIC_CNT -eq 3 ]; then
NIC_ID="enp3s0"
fi
if [ $NIC_CNT -eq 4 ]; then
  NIC_ID="enp3s0"
fi
echo $NIC_ID >> $LOG

cat /sys/class/net/$NIC_ID/address


Kind regards
Michael

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