Hi~ ns users... I couldn't go 'cause of the following problem. The problem is how to access the variables of mobile IP header. Specifically, ---The problem--- In the source code, mip-reg.cc, how can I get the MipRegType, such as MIPT_REG_REQUEST, MIPT_REG_REPLY, MIPT_ADS, MIPT_SOL..., in hdr_mip(mobile IP header) from other class??? I would very appreciate any help... Regards Jay