How do you solve segmentation fault in ns2?

An error in which a running program attempts to access memory not allocated to it and core dumps with a segmentation violation error. This is often caused by improper usage of pointers in the source...

Example: int *p= (int *)-1; *p= 0;

You either reference memory that is non existent, or you attempt to modify memory that is read only. This is usually a result of failure to properly initialize or use pointers or arrays.

Unfortunately, the problem is usually caused by the application itself. You should file a bug report with the application's developers if it reoccurs.

by jail breaking it