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LISP: FRITZ!Box as a LISP Router
FRITZ!Box 6820 LTE 61
Components of a LISP System
Possible Uses
LISP is useful if technical or organization reasons make
it preferable to keep the same IP addresses, even when
you switch Internet service providers.
Mobility example: When you change locations, devices
do not lose their identity (host devices, virtual ma-
chines).
LISP is suitable for communication between IPv4 and
IPv6 networks.
Mapping system The mapping system is responsible for allocat-
ing the EIDs to the RLOCs.
ETR (Egress Tunnel
Router)
The ETR accepts IP packets whose destination
IP address contained in the external header is
the ETR’s own RLOC. ETR unpacks the LISP pack-
ets.
ITR (Ingress Tunnel
Router)
The ITR accepts IP packets from members of the
local IP network (EID network) and packs them
into LISP packets. The external header of the
LISP packet contains the RLOC of the destina-
tion network (remote EID network) as the desti-
nation address.
PETR (Proxy ETR) A PETR (Proxy ETR) is required for communica-
tion between LISP sites and non-LISP sites. On
the LISP side it works like a LISP router; on the
non-LISP side it works like a native IP router.
PITR (PROXY ITR) A PITR (Proxy ITR) is required for communication
between LISP sites and non-LISP sites. On the
LISP side it works like a LISP router; on the non-
LISP side it works like a native IP router.
xTR xTR is what we call a component that is both
ETR and ITR. xTR is also known as a tunnel end-
point or encapsulation endpoint.
61


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