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HIRSCHMANN NB1810 NetModule Router User Manual

5.4.7. 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 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 setups.  
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 em-  
ploys 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 3344, 5177, 3024 and 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.  
If MIP is run as a mobile node, the following settings can be configured:  
Parameter  
Mobile IP Configuration  
Primary home agent ad- The address of the primary home agent  
dress  
Secondary home agent ad- The address of the secondary home agent. The mobile node will try to  
dress  
register with this home agent, if the primary home agent is not reach-  
able.  
Home address  
SPI  
The permanent home address of the mobile node which can be used  
to reach the mobile router at any time.  
The Security Parameter Index (SPI) identifying the security context for  
the mobile IP tunnel between the mobile node and the home agent.  
This is used to distinguish mobile nodes from each other. Therefore  
each mobile node needs to be assigned a unique SPI. This is a 32-bit  
hexadecimal value.  
Authentication type  
The used authentication algorithm. This can be prefix-suffix-md5 (de-  
fault for MIP) or hmac-md5.  
NB1810  
100  
User Manual for NRSW version 4.8.0.102  
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NameHIRSCHMANN NB1810 NetModule Router User Manual
MakeHIRSCHMANN
LanguageEnglish
FiletypePDF (Download)
File size MB
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