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configuration:mobile-ip [2014/11/27 20:27]
configuration:mobile-ip [2014/11/27 20:27] (current)
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 +====== Mobile IP ======
 +[[wp>​Mobile_IP|Mobile IP]] (MIP) can be used to enable seamless switching between different kinds of WAN links (e.g. WWAN/WLAN). The mobile node hereby remains reachable via the same IP address (home address) at any time, independently of the WAN link being
 +used. Effectively,​ any WAN link switch causes very small outages during switchover while keeping all IP connections alive.
 +Moreover, NetModule routers also support [[wp>​NAT_Traversal |NAT-Traversal]] for mobile nodes running behind a firewall (performing NAT), which makes mobile nodes even there accessible from a central office via their home address, and thus, bypassing any complicated VPN
 +The home agent accomplishes this by establishing a tunnel (similar to a VPN tunnel) between itself and the mobile node. WAN link switching works by telling the home agent that the WAN IP address (called the care-of address in MIP terms) of the
 +mobile node has changed. The home agent will then encapsulate packets destined to a mobile node’s home address into a tunnel packet containing the current care-of address of the mobile node as its destination address.
 +To prevent problems with firewalls and private IP addressing, the MIP implementation always employs reverse tunneling, which means that all traffic sent by a mobile node is relayed via the tunnel to the home agent instead of directly being conveyed to the final destination. This fact also empowers MIP to be used as a lightweight VPN replacement (without payload secrecy).
 +The MIP implementation supports RFCs [[http://​tools.ietf.org/​html/​rfc3344|3344]],​ [[http://​tools.ietf.org/​html/​rfc5177|5177]],​ [[http://​tools.ietf.org/​html/​rfc3024|3024]] and [[http://​tools.ietf.org/​html/​rfc3519|3519]]. For applications requiring vast numbers of mobile nodes, interoperability with the Cisco 2900 Series home agent implementation has been verified. However, since NetModule routers implement a mobile node as well as a home agent, a MIP network with up to 10 mobile nodes can be implemented without requiring expensive third party routers.