Yes, SLIM DIYM can be used across a WAN network connection. The migration throughput may be negatively affected though by the limited available bandwidth and/or high latency. The network team may also not appreciate the use of scarce (and often expensive) WAN link capacity for running migrations.
Alternatives that may be considered are:
- running SLIM DIYM on a Citrix server or server with remote desktop software in close network vicinity of the source and target systems to avoid transfer of large data volumes across the WAN link
- use of WAN Optimisation Controllers (e.g. Riverbed Steelhead or BlueCoat MACH5) to leverage caching and compression techniques.