[ns] TCP conncetion too many?

[Pan Li <panli@info.sh.cn>]

hi, all:
     I run a simulation that many TCP connections compete a congestion
link. I get following error when the connection number exceeds 32. How
can I solve this problem?

Number of nodes exceeds node-field-size of 7 bits
    while executing
"error "Number of nodes exceeds node-field-size of $nodebits_ bits""
    (procedure "_o3" line 4)
    (Simulator check-node-num line 4)
    invoked from within
"$self check-node-num"
    (procedure "_o3" line 18)
    (Simulator node line 18)
    invoked from within
"$ns node"
.......