text: (cid:2) IP partnerships between the two systems can be over IPv4 or IPv6 only, but not both. 
  
  (cid:2) Virtual LAN (VLAN) tagging of the IP addresses that are configured for remote copy is 
  supported starting with V7.4. 
  
  (cid:2) Management IP and iSCSI IP on the same port can be in a different network starting with 
  V7.4. 
  
  (cid:2) An added layer of security is provided by using Challenge Handshake Authentication 
  Protocol (CHAP) authentication. 
  
  (cid:2) Transmission Control Protocol (TCP) ports 3260 and 3265 are used for IP partnership 
  communications. Therefore, these ports must be open in firewalls between the systems. 
  
  (cid:2) Only a single Remote Copy (RC) data session per physical link can be established. It is 
  intended that only one connection (for sending/receiving Remote Copy data) is made for 
  each independent physical link between the systems. 
  
  **Note:**A physical link is the physical IP link between the two sites: A (local) and B 
  (remote). Multiple IP addresses on local system A could be connected (by Ethernet 
  switches) to this physical link. Similarly, multiple IP addresses on remote system B 
  could be connected (by Ethernet switches) to the same physical link. At any point in 
  time, only a single IP address on cluster A can form an RC data session with an IP 
  address on cluster B. 