FS#2789 - WAN-LAN leakage during boot on Asus RT-N11P

[openwrt-bot]

TmorKax:

On Asus RT-N11P (MT7620N) not work properly DHCP. Zero-day bug. Affected all firmwares from 18.06.0 to 19.07.1. No additional packages used.

Steps to reproduce:

1: Reboot router when any OS fully loaded.
2: After reboot router give through DHCP internal ip my ISP.
3: No internet connection.

If restart OS network, router give normal ip. But if again reboot router then the problem is repeated. Its a bug MT7620N but official router firmware have solution to bypass it and DHCP gives normal ip.
For now, to bypass the bug, I use manual entry in OS network settings:

Addres 192.168.1.127
Netmask 255.255.255.0
Gateway 192.168.1.1
DNS 192.168.1.1

[openwrt-bot]

bjonglez:

This looks like a WAN-LAN leakage during boot because the switch is not yet configured.

Can you provide your switch configuration (/etc/config/network)?

[openwrt-bot]

TmorKax:

Sure. Only when this happens I do not have access through ssh. Have to re-enable OS network to make it work. Therefore, I do not know if the network config contains traces of the problem or after I re-enable OS network, no longer.

config interface 'loopback'
option ifname 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'

config globals 'globals'
option ula_prefix 'XXXX:XXXX:XXXX::/XX'

config interface 'lan'
option type 'bridge'
option ifname 'eth0.1'
option proto 'static'
option ipaddr '192.168.1.1'
option netmask '255.255.255.0'
option ip6assign '60'

config device 'lan_eth0_1_dev'
option name 'eth0.1'
option macaddr 'XX:XX:XX:XX:XX:XX'

config interface 'wan'
option ifname 'eth0.2'
option proto 'dhcp'

config device 'wan_eth0_2_dev'
option name 'eth0.2'
option macaddr 'XX:XX:XX:XX:XX:XX'

config interface 'wan6'
option ifname 'eth0.2'
option proto 'dhcpv6'
option auto '0'

config switch
option name 'switch0'
option reset '1'
option enable_vlan '1'

config switch_vlan
option device 'switch0'
option vlan '1'
option ports '0 1 2 3 6t'

config switch_vlan
option device 'switch0'
option vlan '2'
option ports '4 6t'