¹⁰. As we discussed in Chapter 1, there are basically two methods to accomplish the packet redirection needed to support mobility: encapsulation and simply changing the packet’s destination address. The CDPD specification team elected to go with encapsulation because we felt that it was a ”cleaner” design. Changing the packet destination address would require insertion of the M-ES’s NEI somewhere in the packet to enable the serving MD-IS to correctly handle the packet.