[ns] Problem about MobileIP Variable "regagent_"

Hello everyone: I'm a new NS2 user.NS2 run on Fedora Core 5.And version is NS2-allinone-2.27.I use NS2 for MobileIP simulation. When I run a script named mobileIP.tcl copied from "http://140.116.72.80/~smallko/ns2/mobileip.htm."NS2 returned following error info:[EMAIL PROTECTED] testns]#ns

[ns] Problem with "regagent_"

hello everybody:I use NS2-2.27 recently,the OS is Fedora Core 5 ,and encounter a problem while I run a wireless simulation.first is the tcl script:mobileIP.tcl# ==# Options# ==