Destination MAC-address (<mac> parameter)
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Mac (MAC-address) parameter specifies the MAC-address of the target DS to which the VSP will be establishing outgoing connections. Before establishing a connection the VSP will perform a so-called "MAC->IP mapping" to find out which IP-address currently corresponds to a specified MAC-address. When the IP-address is "resolved" the VSP will proceed in a normal way i.e. attempt to establish a data connection with the DS at this IP-address.
Specifying MAC-address instead of the IP-address is useful in cases when the DS is running with DHCP enabled (see DHCP (DH) setting) and its IP-address can potentially change over time. If the target DS is specified by its MAC the VSP will still be able to find it. Note, that MAC->IP mapping only works for local* Device Servers, remote Device Servers have to be referenced by their IP-address.
If both the ip and mac parameter are specified the ip parameter takes precedence and mac parameter is ignored. At least one of the two parameters has to be specified to define the target DS.
This parameter is irrelevant when the routing mode is "server" because in this mode the VSP never establishes outgoing connections.
MAC->IP mapping works just like the one on the VSP for Windows (see single-destination mode).
* I.e. Device Servers located on the same network segment with the PC. The definition of the network segment implies that there are only network hubs (and no routers, bridges, firewalls, etc.) between the PC and all other devices on the segment.