hEX <-> SXT LTE6 kit

Hello,
this is my first post here, but I've been using Mikrotik for some time. My setup consist of hEX, USB LTE modem attached to the hEX, few access points managed by CAPsMAN, few random switches, and many clients.
Recently my USB LTE modem died and I decided to buy SXT LTE6 kit. Here my problems begin. I just can't force hEX (eth1) to work with SXT (eth1). Both devices start, but the ether1 in hEX seems to be inactive (listed with italic letters) even when enabled in interfaces, and of course it reports no traffic.

I prefer to keep hEX as the main router (as there's a stable configuration with other devices on it) and use SXT basically as a modem. I don't mind however, if it will be necessary to keep NAT or DHCP server (for connecting to hEX purposes) on it or not.

Can you advise from the scratch what would be the easiest way to make this pair work together and keep the rest of my original network layout unchanged?

Thanks
Luc

This is possible of course.
SXTR can give his ISP IP give to hex OR give internet via NATed network.
You try use SXTR with his poe adapter and your laptop, when this works ang give you internet then just re-connect cable to hex post (without poe-out).
If you plan poe from hex then give exacly hex model to check power output.

Thanks a lot for your suggestions.
I decided to use the SXT as a router "one level up" over my hEX (just feels a bit more safe, to me at least). hEX has a DHCP client running and listening to SXT DHCP server on ether1. Of course hEX still has its own DHCP server as before, to give IPs to all my end clients.

One question more - if I use "Use Peer DNS=no" in hEXs DHCP client, then all my end clients that are connected to hEX will get DNS from hEX, which ignores DNS defined in SXT, right?

Thanks.
L

Yes.
End-Users receive DNS from DHCP who can provide a PublicIP, RouterIP (who can Pass your ISP DNS…).