DHCP on MX

[CashG]

Our main location uses a MX84 and our branch locations use MX64. I've had some issues with older devices on the MX84 getting DHCP. I'm just trying to figure out why and what I can do to maybe get them to work.

So on the MX84 I don't have any issues with computers or cameras or printers getting DHCP. However the first time I had an issue is with a Cisco ATA192. It would not get DHCP, but if I went to another location with the MX64 it would. I then figured out if I manually update the firmware of the ATA192 it would then work properly.

My issue now is I have a old credit card machine, ingenico iCT220, that will not get DHCP. I've had a newer model work fine. My guess is that if I take it to a location with the MX64 it will work.

There is an event log where it attempts to get a DHCP lease but its like it just doesnt stick.

Also I can not set a static IP on this machine because it is owned by the CC company. 

I'm just trying to understand why this is.

[alemabrahao]

Sorry, but I can't see this having an MX issue. Is your card machine connecting via Wifi?

What type of authentication are you using, is your Wifi also Meraki?

[CashG]

No this is not on Wifi. Like I stated it seems to be older out of date devices. With the ATA192 I had no issues with DHCP on the MX64 but would not get DHCP on the MX84 until I did a firmare upgrade on the ATA192 and then it worked fine. I've tried 3 differnt iCT220 on the MX84 and none would get DHCP but a newer model (I don't remember the exact model) would get DHCP just fine. I'm thinking about taking it to a location with a MX64 and trying it.

[alemabrahao]

And if you connect directly to the MX, is the problem the same?

Did you do a packet capture?

I still don't see it as an MX problem.

[CashG]

I tried the MX64 and same issue. Directly connecting is the same thing. I would have to time a packet capture. When iCT220 is plugged in you can see an event log of it trying to give it a DCHP lease with all the correct IP, subnet, and DNS but its like the iCT220 won't accept it. Like I said the iCT220 is a very old model and even the CC company said they wont try to do much with it since its so old.  I even tried to set static info in the MX using the iCT220 MAC. 

[PhilipDAth]

Does anything appear in the Meraki event log?

When the DHCP fails - does it in fact shows as having done the lease to the device in the Meraki dashboard?

Try changing it to be a static DHCP reservation.  This changes the negotiation behaviour.