a3ComDvmrpRouteChildTunnel 1.3.6.1.4.1.43.2.28.3.1.1.11

This object is the same as above but includes tunnel ports only. The first (should say the second) octet specifies ports from 1025 (for tunnel port 1) to 1032, the next octet specifies ports 1033 to 1040, ... etc.