RPi3B+: failed to assign IPv4 address in WLAN

Installing and Using OpenWrt Network and Wireless Configuration
1

I want to convert Raspberry Pi 3B+ to a Wi-Fi router. RPi3B+ consists of a LAN port and WLAN.

After installing OpenWrt v23.05.0 on a micro SD card and configuration, although SSID is shown in a client, there're a few problems:

  1. WLAN interface did not have IPv4 address assigned.
  2. AP authentication was OK, but IPv4 was not assigned and there was no Internet access.

note:

  1. eth0: LAN port, connected to Internet, 192.168.10.xxx was obtained.
  2. phy0-ap0: AP, I wanted to assign 192.168.87.1 to this interface but failed.

ifconfig (on OpenWrt):

eth0      Link encap:Ethernet  HWaddr B8:xx:xx:xx:xx:xx  
          inet addr:192.168.10.xxx  Bcast:192.168.xx.255  Mask:255.255.255.0
          inet6 addr: xx::xx:xx:xx:xx/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:51 errors:0 dropped:0 overruns:0 frame:0
          TX packets:83 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:16192 (15.8 KiB)  TX bytes:12454 (12.1 KiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:88 errors:0 dropped:0 overruns:0 frame:0
          TX packets:88 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:8351 (8.1 KiB)  TX bytes:8351 (8.1 KiB)

phy0-ap0  Link encap:Ethernet  HWaddr BA:xx:xx:xx:xx:xx  
          inet6 addr: xx::xx:xx:xx:xx/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:826 (826.0 B)

tun0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:10.16.xx.xx  P-t-P:10.16.xx.xx  Mask:255.255.0.0
          inet6 addr: xx::xx:xx:xx:xx/64 Scope:Link
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:304 (304.0 B)  TX bytes:608 (608.0 B)

network:

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

config globals 'globals'
        option ula_prefix 'fd2e:afcf:cc26::/48'

config interface 'lan'
        option device 'phy0-ap0'
        option proto 'static'
        option ipaddr '192.168.87.1'
        option ip6assign '60'
        option type 'bridge'
        option netmask '255.255.255.0'

config interface 'wan'
        option proto 'dhcp'
        option device 'eth0'
        option peerdns '0'
        list dns 'xx.xx.xx.xx'

config interface 'tun'
        option proto 'none'
        option device 'tun0'

dhcp:

config dnsmasq
        option domainneeded '1'
        option boguspriv '1'
        option filterwin2k '0'
        option localise_queries '1'
        option rebind_protection '1'
        option rebind_localhost '1'
        option local '/lan/'
        option domain 'lan'
        option expandhosts '1'
        option nonegcache '0'
        option cachesize '1000'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
        option nonwildcard '1'
        option localservice '1'
        option ednspacket_max '1232'
        option filter_aaaa '0'
        option filter_a '0'
        option confdir '/tmp/dnsmasq.d'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv6 'server'
        option ra 'server'
        list ra_flags 'managed-config'
        list ra_flags 'other-config'

config dhcp 'wan'
        option interface 'wan'
        option ignore '1'

config odhcpd 'odhcpd'
        option maindhcp '0'
        option leasefile '/tmp/hosts/odhcpd'
        option leasetrigger '/usr/sbin/odhcpd-update'
        option loglevel '4'

firewall:

config defaults
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option synflood_protect '1'

config zone
        option name 'lan'
        list network 'lan'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'ACCEPT'

config zone
        option name 'wan'
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        list network 'wan'

config rule
        option name 'Allow-DHCP-Renew'
        option src 'wan'
        option proto 'udp'
        option dest_port '68'
        option target 'ACCEPT'
        option family 'ipv4'

config rule
        option name 'Allow-Ping'
        option src 'wan'
        option proto 'icmp'
        option icmp_type 'echo-request'
        option family 'ipv4'
        option target 'ACCEPT'

config rule
        option name 'Allow-IGMP'
        option src 'wan'
        option proto 'igmp'
        option family 'ipv4'
        option target 'ACCEPT'

config rule
        option name 'Allow-DHCPv6'
        option src 'wan'
        option proto 'udp'
        option dest_port '546'
        option family 'ipv6'
        option target 'ACCEPT'

config rule
        option name 'Allow-MLD'
        option src 'wan'
        option proto 'icmp'
        option src_ip 'fe80::/10'
        list icmp_type '130/0'
        list icmp_type '131/0'
        list icmp_type '132/0'
        list icmp_type '143/0'
        option family 'ipv6'
        option target 'ACCEPT'

config rule
        option name 'Allow-ICMPv6-Input'
        option src 'wan'
        option proto 'icmp'
        list icmp_type 'echo-request'
        list icmp_type 'echo-reply'
        list icmp_type 'destination-unreachable'
        list icmp_type 'packet-too-big'
        list icmp_type 'time-exceeded'
        list icmp_type 'bad-header'
        list icmp_type 'unknown-header-type'
        list icmp_type 'router-solicitation'
        list icmp_type 'neighbour-solicitation'
        list icmp_type 'router-advertisement'
        list icmp_type 'neighbour-advertisement'
        option limit '1000/sec'
        option family 'ipv6'
        option target 'ACCEPT'

config rule
        option name 'Allow-ICMPv6-Forward'
        option src 'wan'
        option dest '*'
        option proto 'icmp'
        list icmp_type 'echo-request'
        list icmp_type 'echo-reply'
        list icmp_type 'destination-unreachable'
        list icmp_type 'packet-too-big'
        list icmp_type 'time-exceeded'
        list icmp_type 'bad-header'
        list icmp_type 'unknown-header-type'
        option limit '1000/sec'
        option family 'ipv6'
        option target 'ACCEPT'

config rule
        option name 'Allow-IPSec-ESP'
        option src 'wan'
        option dest 'lan'
        option proto 'esp'
        option target 'ACCEPT'

config rule
        option name 'Allow-ISAKMP'
        option src 'wan'
        option dest 'lan'
        option dest_port '500'
        option proto 'udp'
        option target 'ACCEPT'

config zone
        option name 'tun'
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option masq '1'
        option mtu_fix '1'
        list network 'tun'

config forwarding
        option src 'lan'
        option dest 'tun'

wireless:

onfig wifi-device 'radio0'
        option type 'mac80211'
        option path 'platform/soc/3f300000.mmcnr/mmc_host/mmc1/mmc1:0001/mmc1:0001:1'
        option channel '36'
        option band '5g'
        option htmode 'VHT80'
        option disabled '0'

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option ssid 'xx'
        option encryption 'psk2'
        option key 'xx'

dmesg:

[    6.544107] NET: Registered PF_PPPOX protocol family
[    6.566074] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[    6.579139] usbcore: registered new interface driver brcmfmac
[    6.589019] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43455-sdio.raspberrypi,3-model-b-plus.bin failed with error -2
[    6.604836] brcmfmac mmc1:0001:1: Falling back to sysfs fallback for: brcm/brcmfmac43455-sdio.raspberrypi,3-model-b-plus.bin
[    6.621782] kmodloader: done loading kernel modules from /etc/modules.d/*
[    6.814969] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Jul 29 2022 02:15:20 version 7.45.250 (70e9766 CY) FWID 01-e53e306b
[    8.896628] lan78xx 1-1.1.1:1.0 eth0: kevent 4 may have been dropped
[    8.908279] 8021q: adding VLAN 0 to HW filter on device eth0
[    8.920761] lan78xx 1-1.1.1:1.0 eth0: Link is Down
[    9.265490] brcmfmac mmc1:0001:1 phy0-ap0: renamed from wlan0
[    9.738494] IPv6: ADDRCONF(NETDEV_CHANGE): phy0-ap0: link becomes ready
[   12.995551] lan78xx 1-1.1.1:1.0 eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[   13.011375] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
2

Remove the device line and the option type bridge line, too.

Restart and try again.