[FS#3283] LUCI unavailable when WAN MAC specified

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Robert LeBlanc (rldleblanc) 

Attached to Project - OpenWrt/LEDE Project
Summary - LUCI unavailable when WAN MAC specified
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Running 'OpenWrt 19.07.3 r11063-85e04e9f46' on a Linksys WRT32ACM v1 if you set the WAN MAC to something other than what it really is, you can not access LUCI using the internal router IP (192.168.1.1) when the WAN is plugged in. If unplug the WAN, access to 192.168.1.1 is restored. This does not impact the IPv6 access via `openwrt.lan`. Repeatedly plugging and unplugging the WAN makes the problem appear and go away. I tried all kinds of Firewall rules and port forwards, rebooted and reset many times. I reverted the WAN MAC back to the actual hardware address and it works just fine. It appears that eth1.2 gets the new MAC, but the underlying eth1 still has the burned in MAC and I think that the card drops the packets (VLAN interfaces should have the same MAC as the parent). I'm now noticing that the MAC lines up with the wlan0 interface that was down and that could also contribute to the problem.

Supply the following if possible:
 - Device problem occurs on
 - Software versions of OpenWrt/LEDE release, packages, etc.
 - Steps to reproduce
   

 1: lo:  mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth1:  mtu 1500 qdisc mq state UP qlen 532
    link/ether 24:f5:a2:2f:39:d8 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::26f5:a2ff:fe2f:39d8/64 scope link 
       valid_lft forever preferred_lft forever
3: eth0:  mtu 1500 qdisc mq state UP qlen 532
    link/ether 26:f5:a2:2f:39:d8 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::24f5:a2ff:fe2f:39d8/64 scope link 
       valid_lft forever preferred_lft forever
5: wlan0:  mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 24:f5:a2:2f:39:da brd ff:ff:ff:ff:ff:ff
6: wlan1:  mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 24:f5:a2:2f:39:d9 brd ff:ff:ff:ff:ff:ff
7: mlan0:  mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 24:f5:a2:2f:39:db brd ff:ff:ff:ff:ff:ff
8: br-lan:  mtu 1500 qdisc noqueue state UP qlen 1000
    link/ether 26:f5:a2:2f:39:d8 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.1/24 brd 192.168.1.255 scope global br-lan
       valid_lft forever preferred_lft forever
    inet6 2600:6c52:6300:74d6::1/64 scope global dynamic 
       valid_lft 600870sec preferred_lft 600870sec
    inet6 fdaa:bf91:a905::1/60 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::24f5:a2ff:fe2f:39d8/64 scope link 
       valid_lft forever preferred_lft forever
9: eth0.1 at eth0:  mtu 1500 qdisc noqueue master br-lan state UP qlen 1000
    link/ether 26:f5:a2:2f:39:d8 brd ff:ff:ff:ff:ff:ff
11: eth1.2 at eth1:  mtu 1500 qdisc noqueue state UP qlen 1000
    link/ether 24:f5:a2:2f:39:da brd ff:ff:ff:ff:ff:ff
    inet xx.xx.xx.xx/24 brd 24.176.239.255 scope global eth1.2
       valid_lft forever preferred_lft forever
    inet6 2600:6c52:7008:400:d99f:4eea:b0fd:a61/128 scope global dynamic 
       valid_lft 600870sec preferred_lft 600870sec
    inet6 fe80::26f5:a2ff:fe2f:39da/64 scope link 
       valid_lft forever preferred_lft forever


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3283

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