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nhrpd: Document how to block redirected multicast packets

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Signed-off-by: Reuben Dowle <reuben.dowle@4rf.com>
This commit is contained in:
Reuben Dowle 2021-03-09 13:52:23 +13:00
parent ca317495b8
commit ab9ad933d0
1 changed files with 5 additions and 2 deletions
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doc/user/nhrpd.rst
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@ -189,11 +189,14 @@ nhrpd can be configured to forward multicast packets, allowing routing
protocols that use multicast (such as OSPF) to be supported in the DMVPN protocols that use multicast (such as OSPF) to be supported in the DMVPN
network. network.
This support requires an NFLOG redirection rule to work: This support requires an iptables NFLOG rule to allow nhrpd to intercept
multicast packets. A second iptables rule is also usually used to drop the
original multicast packet.
.. code-block:: shell .. code-block:: shell
iptables -I OUTPUT -d 224.0.0.0/24 -o gre1 -j NFLOG --nflog-group 2 iptables -A OUTPUT -d 224.0.0.0/24 -o gre1 -j NFLOG --nflog-group 2
iptables -A OUTPUT -d 224.0.0.0/24 -o gre1 -j DROP
.. index:: nhrp multicast-nflog-group (1-65535) .. index:: nhrp multicast-nflog-group (1-65535)
.. clicmd:: nhrp multicast-nflog-group (1-65535) .. clicmd:: nhrp multicast-nflog-group (1-65535)