What does mean “net” at changelog?:
What’s new in 6.34rc30 (2015-Dec-30 13:57):
…
*) net - fixed possible kernel failure/lock-up;
*) net - do not show L2MTU in VLAN compact export;
*) net - fixed net crash when firewall jump rule points to disabled custom chain;
*) net - apply slave config only if master config has been changed;
…
No one know what is “net” at MT ROS and nobody asking about it ???
probably no ones uses that. 
But I’m curious about it too… 
Maybe some system to do network-wide configuration management?
I don’t know if that is available. And I don’t know what I exactly would like in such a system.
Probably things like management of “address lists” and specific custom tables in the IP Firewall, maybe
also things like DNS and NTP server setting, firmware update channel selection, etc.