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internet: Document IPv4 DPD support (based on commit log from Jared Dulmage)

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Tom Henderson
2019-10-30 06:25:21 -07:00
parent 5ac2bb39ff
commit 39dc3437ce
1 changed files with 12 additions and 0 deletions
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src/internet/doc/ipv4.rst
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@@ -221,3 +221,15 @@ Ipv4QueueDiscItem. It returns true if marking the packet is successful, i.e.,
it successfully sets the CE bit in the IPv4 header. The ``Mark ()`` method
will return false, however, if the IPv4 header indicates the ``ECN_NotECT``
codepoint.
RFC 6621 duplicate packet detection
***********************************
To support mesh network protocols over broadcast-capable networks (e.g. Wi-Fi),
it is useful to have support for duplicate packet detection and filtering,
since nodes in a network may receive multiple copies of flooded multicast
packets arriving on different paths. The ``Ipv4L3Protocol`` model in |ns3|
has a model for hash-based duplicate packet detection (DPD) based on
Section 6.2.2 of (:rfc:`6621`). The model, disabled by default, must be
enabled by setting ``EnableRFC6621`` to true. A second attribute,
``DuplicateExpire``, sets the expiration delay for erasing the cache entry
of a packet in the duplicate cache; the delay value defaults to 1ms.