I don't believe there's a specific feature here - it's simply the default behavior of the Linux kernel not to route or forward from one interface to another without being specifically configured to do so.
There's text in the help file for the Private LAN that states:
The Data Center Expert server is not a multihomed server. The private LAN (LAN2) is a private network used to communicate with devices monitored by the Data Center Expert server only. Integration with other network configurations, such as routing to a public LAN or redundant links, is not supported.
So it's not just that we don't route the private LAN, we specifically don't support routing the private LAN.
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