NB3000-Line-Hd User Manual 4.2
5.4.4. 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 ad-
dress (
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 con-
nections 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) be-
tween 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 al-
ways employs reverse tunneling, which means that all traffic sent by a
mobile node
is re-
layed via the tunnel to the
home agent
instead of directly being conveyed to the final desti-
nation. 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 requir-
ing 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 imple-
mented 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-
dress
The address of the primary
home agent
Secondary
home
agent
address
The address of the secondary
home agent
. The mobile node
will try to register with this home agent, if the primary
home
agent
is not reachable.
Home address
The permanent home address of the
mobile node
which can
be used to reach the mobile router at any time
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