Yes, you need to get that subnet connected to a router that will reach the remote site.   The default GW you set for iscsi is what is used for replication.  Replication between EQL groups is done over port 3260 as an iSCSI session.   Regards, 
I need to setup replication from an existing EQ group that has all its interfaces on a non-routed subnet; to a newly staged group that will live in a different subnet.  Initially the two groups will be co-located for staging, but the new group will be moved to a remote site, but retain the private addressing it gets assigned. What's the best practice for configuring the replication?  Do I just need to allow routing on the iSCSI networks?
Replication to different subnet