Configuring Unifi USG with Spark 4G Smart Modem 2

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Yoshinoya

4 posts

Wannabe Geek

#307071 16-Sep-2023 10:12

Hi,

I have a 4G connection and a Unifi setup with USG, 8port switch, and some APs.

Struggling with the config to get this working through the USG.

Do I need the Smart Modem in bridge mode and the USG with PPOE?

I have a static IP with the 4G connection.

Jiriteach

1119 posts

Uber Geek

ID Verified

Lifetime subscriber

#3128540 16-Sep-2023 11:30

Reset the SSM2 to factory settings - it will establish the 4G connection easily enough.
Plug the USG WAN into one of the SSM2 LAN ports.

On the USG side - set the WAN connection to DHCP or static IP. Static IP is better.
Enter a static IP on the same subnet as the SSM2. Gateway should be set to the SSM2 and same with IP.

That should be it.

-- opinions expressed by me are solely my own. ie - personal

Yoshinoya

4 posts

Wannabe Geek

#3128648 16-Sep-2023 16:13

Hi,

Still not getting an IP on the USG. Not sure what's going on

Jiriteach

1119 posts

Uber Geek

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Lifetime subscriber

#3128655 16-Sep-2023 16:46

Untick use VLAN 10 on your WAN settings for the USG.

Ideally you want to have seperate IP subnets else it gets really confusing.
Some recommendations below -

SSM2

LAN IP -
IP Address - 192.168.1.254
IP Subnet Mask - 255.255.255.0

IP Address Pool -
Start IP - 192.168.1.100
End IP - 192.168.1.220

USG

LAN Settings
Gateway/Subnet - 192.168.2.1/24
DHCP Range - 192.168.2.100-192.168.2.220

WAN Settings
Static IP
IP Address - 192.168.1.2
Subnet Mask - 255.255.255.0
Router - 192.168.1.254
DNS Server - 192.168.1.254

-- opinions expressed by me are solely my own. ie - personal