Specifications

Chapter 6 Configuring Proxy Mobile IP
Proxy Mobile IP
6-2
Cisco Aironet Access Point Software Configuration Guide
OL-0657-07
Proxy Mobile IP
These sections explain how access points conduct proxy Mobile IP:
• Overview, page 6-2
• Components of a Proxy Mobile IP Network, page 6-3
• How Proxy Mobile IP Works, page 6-4
• Proxy Mobile IP Security, page 6-8
Overview
The access point’s proxy Mobile IP feature works in conjunction with the Mobile
IP feature on Cisco devices on the wired network. When you enable proxy Mobile
IP on your access point and on your wired network, the access point helps client
devices from other networks remain connected to their home networks. The
visiting client devices do not need special software; the access point provides
proxy Mobile IP services on their behalf. Any wireless client can participate.
Mobile IP provides users the freedom to roam beyond their home subnets while
maintaining their home IP addresses. This enables transparent routing of IP
datagrams to mobile users during their movement, so that data sessions can be
initiated to them while they roam. For example, a client device with an IP address
of 192.95.5.2 could associate to an access point on a network whose IP addresses
are in the 209.165.200.x range. The guest client device keeps its 192.95.5.2 IP
address, and the access point forwards its packets through a Mobile IP enabled
router across the Internet to a router on the client’s home network.
Access points with proxy Mobile IP enabled attempt to provide proxy service for
any client device that associates and does not perform the following:
• Issue a DHCP request to get a new IP address.
• Support a Mobile IP stack. If a device supports a Mobile IP stack, the access
point assumes that the device will perform its own Mobile IP functions.
You enable proxy Mobile IP for specific SSIDs on the access point, providing
support only for clients who use those SSIDs. Proxy Mobile IP does not support
VLANs.
Proxy Mobile IP is disabled by default.