FWA-1012VC network port naming issue in Ubuntu

Purpose:

The Ethernet port naming would be different on different OS distributions ,  most of the naming will easy to understand (expected) but some of them are not. 

This FAQ shows a case in ubuntu that some of Eth ports were named as "renameX" which are unexpected from our experiences.  The root cause here is the duplicated  “Type Instance” from “dmidecode -t 41” ,  even thought the  “Type Instance” may not be unique, but there's still an instruction to have OS rename Ethnet ports as expected. 

Target Audience:

For users who are using running ubuntu OS on FWA-1012VC

Checks:

Default naming in Ubuntu OS would be as in below

eth0 = eno1
eth1 = rename3
eth2 = rename4
eth3 = rename5
eth4 = rename6
eth5 = rename7

## Root Cause (Should be improved with latest BIOS updated)

According to dmesg , OS renamed the Ethernet devices because “Type Instance” from “dmidecode -t 41” is NOT unique.

* dmi type 41 is pointed to on-board device for NID utility in future ENPD products

##

Unique Type Instance in DMI type 41 will be implemented in most of New BIOS release , this issue would be prevented. Please contact HQ for understanding on this implementations.

Even though the “Type Instance” would lead in issue on Ubuntu , there’s still an workaround (instruction) to make Eth devices more meaningful/readable in below. This instruction is leveraged the “label” info from the DMI and apply to the rule we created.   

1. Create net rules as “/etc/udev/rules.d/70-persistent-net.rules”
2. Adding a line SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", NAME="%s{label}" in “/etc/udev/rules.d/70-persistent-net.rules”
3. Reboot and check devices list

        * Also attached rule from my OS as reference.

New list would be

# ip link show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

2: mgmt0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000

    link/ether c4:00:ad:a3:b5:c4 brd ff:ff:ff:ff:ff:ff

3: mgmt1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000

    link/ether c4:00:ad:a3:b5:c5 brd ff:ff:ff:ff:ff:ff

4: lan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000

    link/ether 00:a0:c9:00:00:00 brd ff:ff:ff:ff:ff:ff

5: wan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000

    link/ether 34:12:78:56:01:01 brd ff:ff:ff:ff:ff:ff

6: lan1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000

    link/ether 00:a0:c9:00:00:02 brd ff:ff:ff:ff:ff:ff

7: wan1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000

    link/ether 34:12:78:56:01:03 brd ff:ff:ff:ff:ff:ff

8: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000

    link/ether 52:54:00:b6:56:5d brd ff:ff:ff:ff:ff:ff

9: virbr0-nic: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN mode DEFAULT group default qlen 1000