HP StorageWorks Storage Mirroring Replicate User's Guide (T5437-96010, November 2009)

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Using firewalls
Storage Mirroring Replicate can be used over a wide area network (WAN) through
firewalls, but it does not support Network Address Translation (NAT) configurations.
If your servers are on opposite sides of a firewall, you will need to configure your
hardware to accommodate Storage Mirroring Replicate communications. You must have
the hardware already in place and know how to configure the hardware ports. If you do
not, see the reference manual for your hardware.