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nhrpd: Document multicast functionality

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Signed-off-by: Reuben Dowle <reuben.dowle@4rf.com>
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Reuben Dowle 2021-02-26 10:10:48 +13:00
parent bc97889b39
commit 3c4f65c59c
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doc/user/nhrpd.rst
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@ -180,6 +180,34 @@ https://git-old.alpinelinux.org/user/tteras/strongswan/
Actively maintained patches are also available at: Actively maintained patches are also available at:
https://gitlab.alpinelinux.org/alpine/aports/-/tree/master/main/strongswan https://gitlab.alpinelinux.org/alpine/aports/-/tree/master/main/strongswan
.. _multicast-functionality:
Multicast Functionality
=======================
nhrpd can be configured to forward multicast packets, allowing routing
protocols that use multicast (such as OSPF) to be supported in the DMVPN
network.
This support requires an NFLOG redirection rule to work:
.. code-block:: shell
iptables -I OUTPUT -d 224.0.0.0/24 -o gre1 -j NFLOG --nflog-group 2
.. index:: nhrp multicast-nflog-group (1-65535)
.. clicmd:: nhrp multicast-nflog-group (1-65535)
Sets the nflog group that nhrpd will listen on for multicast packets. This
value must match the nflog-group value set in the iptables rule.
.. index:: ip nhrp map multicast A.B.C.D|X:X::X:X A.B.C.D|dynamic
.. clicmd:: ip nhrp map multicast A.B.C.D|X:X::X:X A.B.C.D|dynamic
Sends multicast packets to the specified NBMA address. If dynamic is
specified then destination NBMA address (or addresses) are learnt
dynamically.
.. _nhrp-events: .. _nhrp-events:
NHRP Events NHRP Events