Any other security other than IPSec?

Hello,

Would like to know if anyone had ever consider to implement or had any idea to use other security measurements in mipv6 instead of the much talked IPSec?

While the draft indicated most of the communications SHOULD use IPSec, such as during binding, i was thinking performance would be a huge factor under processing bandwidth hunger area such as real time voice processing.

anyone any idea?

thanks in advance.

rgds,
tatkin