Hi,
Having recently received my cAP AX, I started to configure it to serve as an access point with a separate subnet.
Setup should be like follows:
rb-Bridge: <-> rb4011 Ether10 <-> cAP AX Bridge
ether1-9 Ether1-2
wifi1-2
Goal is to have subnets:
All devices on the rb4011 bridge
192.168.1.0/24
All devices on the AP (DHCP server serving at ether10 on routerboard)
192.168.2.0/24
DHCP Servers are in the RB. rb-bridge has DHCP server serving address pools for 192.168.1.2-254 network and Ether10 has DHCP server for serving pools 192.168.2.2-254
Default configuration in the cAP AX has
Bridge
- ether2
- wifi1-2
- DHCP server 192.168.88.1/24
Ether1
- DHCP client
Initially the device works fine with the factory configs, but as I try to either move the ether1 interface to the bridge, disable DHCP client and use static IP address, remove DHCP server, I get disconnected and cannot connect back unless I do a factory reset. So I figure I have something wrong in my steps to achieve the desired subnets or missing some part of the configurations needed 
What could be good pointers to correct procedures to:
- Implementing so that all interfaces on cAP AX are part of the bridge on the AP and successfully become part of the subnet 192.168.2.0/24
- Use the RB4011’s DHCP server on interface ether10 for all devices using the AP. (I attempted to implement a DHCP relay as well by reading through the documentation, but DHCP requests were not relayed properly so probably I did a misconfiguration there)
# factory config
# only changed so that ether1 is on LAN interface list to allow mgmt host to connect from desktop
/interface bridge
add admin-mac=48:A9:8A:A2:90:01 auto-mac=no comment=defconf name=bridge
/interface wifiwave2
set [ find default-name=wifi1 ] channel.band=5ghz-ax .skip-dfs-channels=\
10min-cac .width=20/40/80mhz configuration.mode=ap .ssid=MikroTik-A29002 \
disabled=no security.authentication-types=wpa2-psk,wpa3-psk
set [ find default-name=wifi2 ] channel.band=2ghz-ax .skip-dfs-channels=\
10min-cac .width=20/40mhz configuration.mode=ap .ssid=MikroTik-A29003 \
disabled=no security.authentication-types=wpa2-psk,wpa3-psk
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/ip pool
add name=default-dhcp ranges=192.168.88.10-192.168.88.254
/ip dhcp-server
add address-pool=default-dhcp interface=bridge lease-time=10m name=defconf
/interface bridge port
add bridge=bridge comment=defconf interface=ether2
add bridge=bridge comment=defconf interface=wifi1
add bridge=bridge comment=defconf interface=wifi2
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface list member
add comment=defconf interface=bridge list=LAN
add interface=ether1 list=LAN
/ip address
add address=192.168.88.1/24 comment=defconf interface=bridge network=\
192.168.88.0
/ip dhcp-client
add comment=defconf interface=ether1
/ip dhcp-server network
add address=192.168.88.0/24 comment=defconf dns-server=192.168.88.1 gateway=\
192.168.88.1
/ip dns
set allow-remote-requests=yes
/ip dns static
add address=192.168.88.1 comment=defconf name=router.lan
/ip firewall filter
add action=accept chain=input comment=\
"defconf: accept established,related,untracked" connection-state=\
established,related,untracked
add action=drop chain=input comment="defconf: drop invalid" connection-state=\
invalid
add action=accept chain=input comment="defconf: accept ICMP" protocol=icmp
add action=accept chain=input comment=\
"defconf: accept to local loopback (for CAPsMAN)" dst-address=127.0.0.1
add action=drop chain=input comment="defconf: drop all not coming from LAN" \
in-interface-list=!LAN
add action=accept chain=forward comment="defconf: accept in ipsec policy" \
ipsec-policy=in,ipsec
add action=accept chain=forward comment="defconf: accept out ipsec policy" \
ipsec-policy=out,ipsec
add action=fasttrack-connection chain=forward comment="defconf: fasttrack" \
connection-state=established,related hw-offload=yes
add action=accept chain=forward comment=\
"defconf: accept established,related, untracked" connection-state=\
established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" connection-state=\
invalid
add action=drop chain=forward comment="defconf: drop all from WAN not DSTNATed" \
connection-nat-state=!dstnat connection-state=new in-interface-list=WAN
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" ipsec-policy=\
out,none out-interface-list=WAN
/ipv6 firewall address-list
add address=::/128 comment="defconf: unspecified address" list=bad_ipv6
add address=::1/128 comment="defconf: lo" list=bad_ipv6
add address=fec0::/10 comment="defconf: site-local" list=bad_ipv6
add address=::ffff:0.0.0.0/96 comment="defconf: ipv4-mapped" list=bad_ipv6
add address=::/96 comment="defconf: ipv4 compat" list=bad_ipv6
add address=100::/64 comment="defconf: discard only " list=bad_ipv6
add address=2001:db8::/32 comment="defconf: documentation" list=bad_ipv6
add address=2001:10::/28 comment="defconf: ORCHID" list=bad_ipv6
add address=3ffe::/16 comment="defconf: 6bone" list=bad_ipv6
/ipv6 firewall filter
add action=accept chain=input comment=\
"defconf: accept established,related,untracked" connection-state=\
established,related,untracked
add action=drop chain=input comment="defconf: drop invalid" connection-state=\
invalid
add action=accept chain=input comment="defconf: accept ICMPv6" protocol=icmpv6
add action=accept chain=input comment="defconf: accept UDP traceroute" port=\
33434-33534 protocol=udp
add action=accept chain=input comment=\
"defconf: accept DHCPv6-Client prefix delegation." dst-port=546 protocol=\
udp src-address=fe80::/10
add action=accept chain=input comment="defconf: accept IKE" dst-port=500,4500 \
protocol=udp
add action=accept chain=input comment="defconf: accept ipsec AH" protocol=\
ipsec-ah
add action=accept chain=input comment="defconf: accept ipsec ESP" protocol=\
ipsec-esp
add action=accept chain=input comment=\
"defconf: accept all that matches ipsec policy" ipsec-policy=in,ipsec
add action=drop chain=input comment=\
"defconf: drop everything else not coming from LAN" in-interface-list=!LAN
add action=accept chain=forward comment=\
"defconf: accept established,related,untracked" connection-state=\
established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" connection-state=\
invalid
add action=drop chain=forward comment="defconf: drop packets with bad src ipv6" \
src-address-list=bad_ipv6
add action=drop chain=forward comment="defconf: drop packets with bad dst ipv6" \
dst-address-list=bad_ipv6
add action=drop chain=forward comment="defconf: rfc4890 drop hop-limit=1" \
hop-limit=equal:1 protocol=icmpv6
add action=accept chain=forward comment="defconf: accept ICMPv6" protocol=\
icmpv6
add action=accept chain=forward comment="defconf: accept HIP" protocol=139
add action=accept chain=forward comment="defconf: accept IKE" dst-port=500,4500 \
protocol=udp
add action=accept chain=forward comment="defconf: accept ipsec AH" protocol=\
ipsec-ah
add action=accept chain=forward comment="defconf: accept ipsec ESP" protocol=\
ipsec-esp
add action=accept chain=forward comment=\
"defconf: accept all that matches ipsec policy" ipsec-policy=in,ipsec
add action=drop chain=forward comment=\
"defconf: drop everything else not coming from LAN" in-interface-list=!LAN
/system clock
set time-zone-name=Europe/Helsinki
/system note
set show-at-login=no
/system routerboard mode-button
set enabled=yes on-event=dark-mode
/system script
add comment=defconf dont-require-permissions=no name=dark-mode owner=*sys \
policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon \
source="\r\
\n :if ([system leds settings get all-leds-off] = \"never\") do={\r\
\n /system leds settings set all-leds-off=immediate \r\
\n } else={\r\
\n /system leds settings set all-leds-off=never \r\
\n }\r\
\n "
/tool mac-server
set allowed-interface-list=LAN
/tool mac-server mac-winbox
set allowed-interface-list=LAN