Abstract-The MPT network layer multipath communication library is a novel solution for several problems including IPv6 transition, reliable data transmission using TCP, real-time transmission using UDP and also wireless network layer routing problems. MPT can provide an IPv4 or an IPv6 tunnel over one or more IPv4 or IPv6 communication channels. MPT can also aggregate the capacity of multiple physical channels. In this paper, the channel aggregation capability of the MPT library is measured up to twelve 100Mbps speed channels. Different scenarios are used: both IPv4 and IPv6 are used as the underlying and also as the encapsulated protocols and also both UDP and TCP are used as transport protocols. In addition, measurements are taken with both 32-bit and 64-bit version of the MPT library. In all cases, the number of the physical channels is increased from 1 to 12 and the aggregated throughput is measured.