New Meraki user and setup

[DPringle3]

Hello All,

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.

TIA

[timeshimanshu]

have you enable the dhcp server for MS subnet in the MX?

[DPringle3]

No I have disabled the dhcp server in the MX as the modem is currently handling that function, eventually I will have the MX perform this function.

[timeshimanshu · Accepted solution]

Your modem is acting as a WAN for your MX and its ip would be different and you cant give the same subnet ip to MS too. LAN and WAN ip subnet can't be same, right.

Go to Security & SDWAN > Addressing and VLAN > configure one subnet for your MS.

Now

Go to Security & SDWAN > DHCP and run the dhcp server. That's all.

[DPringle3]

Thanks! That worked, but I thought I tried that already.  Now if I also want to add the MR33, can I just add it to the poe port of the MX?

[timeshimanshu]

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.

[Raj66]

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.

Cheers!

Raj

[SoCalRacer]

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.

https://documentation.meraki.com/MX/Installation_Guides/MX65_Installation_Guide

https://documentation.meraki.com/MX/Networks_and_Routing/MX_Addressing_and_VLANs

https://documentation.meraki.com/MS/Installation_Guides/MS120-8_Series_Installation_Guide

https://documentation.meraki.com/zGeneral_Administration/Tools_and_Troubleshooting/Using_the_Cisco_M...