eth5 as dhcp client

RouterOS General
1

for troubleshooting reasons, i would like to have the eth5 of my 750G as dhcp client. Then be able from my LAN to access the network on eth5.
how could i add eth5 as dhcp client and be able to see whatever network is attached in there, please?

current config:

# 2023-12-10 08:49:48 by RouterOS 7.13.2
# software id = sdfgsb4563
#
# model = RB750G
# serial number = 2
/interface bridge
add name=bridge1 port-cost-mode=short
/interface wireguard
add listen-port=13231 mtu=1420 name=wireguard-home
/interface pppoe-client
add add-default-route=yes disabled=no interface=ether1 name=ISP user=\
    atuxnull@isp.com
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/ip pool
add name=dhcp_pool0 ranges=192.168.170.150-192.168.170.199
/ip dhcp-server
add address-pool=dhcp_pool0 interface=bridge1 lease-time=10m name=dhcp1
/queue simple
add max-limit=25k/1k name=Whoever_10 target=192.168.170.68/32 time=0s-0s,
/interface bridge port
add bridge=bridge1 interface=ether3 internal-path-cost=10 path-cost=10
add bridge=bridge1 interface=ether4 internal-path-cost=10 path-cost=10
add bridge=bridge1 interface=ether5 internal-path-cost=10 path-cost=10
/interface wireguard peers
add allowed-address=10.10.10.2/32 interface=wireguard-home public-key=\
    "SpuxyzfffggcxchsdblgvdfGeoB4="
/ip address
add address=192.168.170.1/24 interface=bridge1 network=192.168.170.0
add address=192.168.178.3/24 interface=ether1 network=192.168.178.0
add address=10.10.10.1/24 interface=wireguard-home network=10.10.10.0
/ip cloud
set ddns-enabled=yes ddns-update-interval=11m
/ip dhcp-server network
add address=192.168.170.0/24 dns-server=192.168.170.1 gateway=192.168.170.1 \
    ntp-server=192.168.170.1
/ip dns
set allow-remote-requests=yes servers=8.8.8.8,1.1.1.1
/ip firewall filter
# no interface
add action=accept chain=input connection-state=established,related \
    in-interface=cosmote
add action=accept chain=input comment="Allow Wireguard" dst-port=13231 \
    protocol=udp
add action=accept chain=input comment="Allow Wireguard traffic" src-address=\
    10.10.10.0/24
# no interface
add action=accept chain=input in-interface=cosmote protocol=icmp
# no interface
add action=accept chain=input dst-port=8291 in-interface=cosmote protocol=tcp
# no interface
add action=drop chain=input in-interface=cosmote
/ip firewall nat
# no interface
add action=masquerade chain=srcnat out-interface=cosmote
/ip service
set telnet disabled=yes
set ftp disabled=yes
set ssh disabled=yes
set api disabled=yes
set api-ssl disabled=yes
/system note
set show-at-login=no
/system ntp client
set enabled=yes
/system ntp server
set broadcast=yes enabled=yes manycast=yes multicast=yes
/system ntp client servers
add address=gr.pool.ntp.org
2

If by that you mean you wish to have a separate subnet but attached to ether5.

  1. take ether5 off the bridge.
  2. give it what a subnet needs, IP pool, IP address, dhcp-server, dhcp-server network
    etc..
3

And don’t forget to add the port as LAN in the Interface list.

4

Are you able to draw out a diagram for what you are trying to do?

5

Take eth5 out of a bridge.
Configure IP > DHCP-client and add “eth5” as DHCP-client.
Be carefull and say “no” to “add default route” I think.

I use the same approach and have a lab RB3001 connected as DHCP “client” on a RB5009 through some ethX port.
Then offcourse check routing if certain prefixed need specific routing across this link.
Screenshot from 2024-01-23 14-59-08.png