I have a new MS120-8lp and MX65 and I am having trouble getting the MS120 device connected. My current setup is MS120(port 😎 => (port 10) MX65 (wan 1 port) => (port) Cable Modem. The MX is connected to the cloud and I can see in the dashboard, but the MS device is unable to connect or receive an dhcp ip from the modem. If I bypass the MX to the modem, the MS device is able to get an ip and connect to the dashboard. Can someone explain what I am missing or have configured incorrectly.
that depends if you want the MR to be in the same subnet as the MS. Secondly if you want to configure the multiple subnet then you need to configure MS port as trunk or if you want to advertise only single subnet then it would be access port.
The MX will act as the router and will segregate the broadcast domain when you connect the switch to the MX LAN and hence it will not be able to get an IP from the cable modem. You can enable DHCP on the MX itself under "security & SD-WAN > DHCP".
The default port configuration for the switches is Trunk with native vlan 1 (Unless you change it). I would suggest to configure port 10 on the MX to the same and enable DHCP in vlan 1 and you should be all set. Let us know how it goes.
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By default the WAN port on the MX does DHCP. So the modem should hand a public address back to the MX WAN. Then the MX does internal DHCP on its own private subnet (192.168.128.0/24) which is the range that should be handed to the MS. You might want to check the local status pages to see the config on the devices. Below are some docs you might want to review that pertain to your hardware/setup.