Ubuntu Eth Name Match Mac Config
Bash script with additional echo statements to display the network interface names and MAC addresses for debugging purposes:
lshw -C network
*-network:0
description: Ethernet interface
product: 82576 Gigabit Network Connection
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:05:00.0
logical name: eth1
version: 01
serial: a0:10:a1:b1:ce:50
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi msix pciexpress bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=igb driverversion=5.15.0-89-generic firmware=1.2.1 ip=192.168.10.11 latency=0 link=no multicast=yes port=twisted pair
resources: irq:36 memory:fc020000-fc03ffff memory:fbc00000-fbffffff ioport:f020(size=32) memory:fc044000-fc047fff memory:fb800000-fbbfffff memory:fc048000-fc067fff memory:fc068000-fc087fff
*-network:1
description: Ethernet interface
product: 82576 Gigabit Network Connection
vendor: Intel Corporation
physical id: 0.1
bus info: pci@0000:05:00.1
logical name: eth2
version: 01
serial: a0:10:a1:b1:ce:51
size: 1Gbit/s
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi msix pciexpress bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=igb driverversion=5.15.0-89-generic duplex=full firmware=1.2.1 ip=192.168.12.11 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:40 memory:fc000000-fc01ffff memory:fb400000-fb7fffff ioport:f000(size=32) memory:fc040000-fc043fff memory:fb000000-fb3fffff memory:fc088000-fc0a7fff memory:fc0a8000-fc0c7fff
*-network
description: Ethernet interface
product: RTL8125 2.5GbE Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:06:00.0
logical name: eth0
version: 05
serial: 00:5c:b1:00:c5:75
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=5.15.0-89-generic latency=0 link=no multicast=yes port=twisted pair
resources: irq:40 ioport:e000(size=256) memory:fc200000-fc20ffff memory:fc210000-fc213fff
From the lshw output, you have three network interfaces, each with detailed information. The interfaces are:
-
eth0
- Product: RTL8125 2.5GbE Controller
- Vendor: Realtek Semiconductor Co., Ltd.
- Bus info:
pci@0000:06:00.0 - MAC Address: 00:5c:b1:00:c5:75
-
eth1
- Product: 82576 Gigabit Network Connection
- Vendor: Intel Corporation
- Bus info:
pci@0000:05:00.0 - MAC Address: a0:10:a1:b1:ce:50
-
eth2
- Product: 82576 Gigabit Network Connection
- Vendor: Intel Corporation
- Bus info:
pci@0000:05:00.1 - MAC Address: a0:10:a1:b1:ce:51
Determining the Onboard Ethernet Interface
Typically, onboard network interfaces will have a different bus location compared to PCIe network cards. In your case:
- eth0 is on
pci@0000:06:00.0 - eth1 and eth2 are on
pci@0000:05:00.0andpci@0000:05:00.1, respectively.
Since both eth1 and eth2 are on the same bus and likely part of the same PCIe card (they both have similar bus info and are both Intel 82576 controllers), it is highly likely that eth0 (Realtek RTL8125) is your onboard network interface.
#!/bin/bash
# Function to get the MAC address for a given interface product
get_mac_address() {
local product_name="$1"
lshw -C network | grep -A 10 "$product_name" | grep serial | awk '{print $2}'
}
# Get MAC addresses of the interfaces
MB_ETH_MAC=$(get_mac_address "RTL8125 2.5GbE Controller")
PCI_ETH1_MAC=$(get_mac_address "82576 Gigabit Network Connection" | head -n 1)
PCI_ETH2_MAC=$(get_mac_address "82576 Gigabit Network Connection" | tail -n 1)
# Display the MAC addresses for debugging
echo "Detected MAC addresses:"
echo "Onboard (Realtek RTL8125) - eth0: $MB_ETH_MAC"
echo "PCIe (Intel 82576) - eth1: $PCI_ETH1_MAC"
echo "PCIe (Intel 82576) - eth2: $PCI_ETH2_MAC"
# Check if we successfully retrieved all MAC addresses
if [ -z "$MB_ETH_MAC" ] || [ -z "$PCI_ETH1_MAC" ] || [ -z "$PCI_ETH2_MAC" ]; then
echo "Error: Unable to retrieve all MAC addresses. Please check the network interfaces."
exit 1
fi
# Create udev rules file
UDEV_RULES_FILE="/etc/udev/rules.d/70-persistent-net.rules"
echo "Creating udev rules file at $UDEV_RULES_FILE..."
# Write udev rules to the file
cat <<EOL | sudo tee $UDEV_RULES_FILE
# Udev rules to set persistent names for network interfaces
# Onboard interface (Realtek RTL8125) as eth0
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="$MB_ETH_MAC", NAME="eth0"
# PCIe interfaces (Intel 82576) as eth1 and eth2
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="$PCI_ETH1_MAC", NAME="eth1"
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="$PCI_ETH2_MAC", NAME="eth2"
EOL
echo "Udev rules created successfully."
# Reload udev rules
echo "Reloading udev rules..."
sudo udevadm control --reload-rules
# Optionally, you can trigger the udev rules (to rename interfaces without a reboot)
echo "Triggering udev rules..."
sudo udevadm trigger --action=add
echo "Network interfaces should now be consistently named."
# Display the new udev rules for verification
echo "Here are the new udev rules:"
cat $UDEV_RULES_FILE
Explanation of the Additions
- Debugging Information:
- Added echo statements to display the detected MAC addresses for each network interface.
- This helps in verifying that the script is correctly identifying the MAC addresses before creating the udev rules.
Steps to Run the Script
-
Create the Script:
Save the above script to a file, for example,
eth_name_mac_config.sh. -
Make the Script Executable:
chmod +x eth_name_mac_config.sh -
Run the Script:
sudo ./eth_name_mac_config.sh
After running the script, it will print the detected MAC addresses and the newly created udev rules for verification. This should help in debugging and ensuring the network interfaces are named correctly based on their MAC addresses.