Thanks. I had a brief chance to troubleshoot and actually the route to 172.17.88.0 works, I wouldn't swear I fully tested that before as I might have assumed that if one route worked then so would the other. Doing a network wide packet capture for ping to 172.17.1.1 shows the packets being received but no answer. But that's the same taking a capture for ping to 172.17.88.1 which does work, only the ping request is seen, I guess because the reply comes direct from the Mikrotik on 217.2 to my PC 217.10.
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