Create a portforward on a Cisco ASA

  object network Alarm
    host 172.30.61.10
  object service TCP6900
    service tcp destination eq 6900
  access-list WAN_access_in line 1 extended permit tcp any object Alarm eq 6900 
  nat (WAN,Guest) 1 source static any any destination static interface Alarm service TCP6900 TCP6900 no-proxy-arp
  access-group WAN_access_in in interface WAN