Operation Manual

FRITZ!Box 7430 78
LISP: FRITZ!Box as a LISP Router
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, VM).
• LISP is suitable for communication between IPv4 and
IPv6 networks.
• Transport of address families: IPv4 via IPv4, IPv4 via
IPv6, IPv6 via IPv6, IPv6 via IPv4
Example: The encapsulation of IPv6 packets in IPv4
headers allows IPv6 web sites to be connected over
IPv4.
Mapping system The mapping system is responsible for allo-
cating 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
packets.
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 des-
tination network (remote EID network) as the
destination 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 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.
xTR xTR is what we call a component that is both
ETR and ITR. xTR is also known as a tunnel
endpoint or encapsulation endpoint.