Thank you so much for the helpful pointers - will try them. This is a WAN only router for home usage, so probably enough to disable fast tracking - all LAN traffic goes through a switch.
Point taken about the ambiguous subject line.
I’m still on 6.40.9 just because I was aware of some non-backward compatible bridge changes in later versions from 6.41, and I’m short of time to test config changes that might require a downgrade if I don’t get them right, based on this forum comment: http://forum.mikrotik.com/t/master-port-setting-missing/116214/1
- any tips on how to simplify this sort of upgrade very welcome