How to Access DSL modem in Front of UTM?

Question

Hi everyone, racking my brain on this one. 
 I'm running MLPPP with 2 x DSL modems. I have each modem plugged into an interface on the UTM. So only have 3 ports running, 1 x Internal and 2 x modem facing (single logical MLPPP). 
 I know each modem is configured for 192.168.x.1 /24. Modem 1 is 1.1, and Modem 2 is 2.1. 
 My internal network is a 10's address. 
 I'm trying to be able to access the 192.xxx modems from my 10's network. 
 Since UTM's implementation of MLPPP is, well weird (In the other 2 firewalls I tried you create 2 ethernet ports with IP addresses etc., then you ADD PPPoE/MLPPP to those ports - easy!). I can't find a way to access these modems without either 1) disconnecting them and plugging them directly into a laptop, or 2) getting another switch to plug all the modems and UTM WAN interfaces into just to 'fudge' getting access to the modems. 
 I tried using "Additional Addresses" on the MLPPP interface, but no joy. 
 Any help would be greatly appreciated!

JohnRiley · Answer

Hi everyone, found work around: 
 
Enable SSH on UTM, and hit the command line 
Find the interfaces in question "ifconfig" 
Then assign the interfaces the addresses manually. 
 
I have 1 modem @ 192.168.1.1, and the other @ 192.168.2.1. 
So 2 commands on the appropriate facing interfaces: 
"ifconfig INTERFACE 192.168.2.2 netmask 255.255.255.0" 
"ifconfig INTERFACE 192.168.1.2 netmask 255.255.255.0 " 
 
Where "INTERFACE" is your eth interface facing the modem(s) 
That did the Trick! Modems are now accessible internally.