If you know the size of the packets that will be using it, then it is simple to cover from one to the other. That's more likely in a simulator than the real world though.
IIRC, TCP acks are usually 48 bytes, but this may vary if extension options and/or IPv6 are in use. Check this yourself on the traffic you're testing. In the forward data flow direction, expect most packets to be at the link segment size limit, 1500 bytes for Ethernet. But if you have heterogeneous or bidirectional traffic, this calculation breaks down. This may simply be one limitation of ns2. - Jonathan Morton
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