65 lines
2.5 KiB
ReStructuredText
65 lines
2.5 KiB
ReStructuredText
gluon-radv-filterd
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==================
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This package drops all incoming router advertisements except for the
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default router with the best metric according to B.A.T.M.A.N. advanced.
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Note that advertisements originating from the node itself (for example
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via gluon-radvd) are not affected and considered at all.
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Selected router
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---------------
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The router selection mechanism is independent from the batman-adv gateway mode.
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In contrast, the device originating the router advertisement could be any router
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or client connected to the mesh, as radv-filterd captures all router
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advertisements originating from it. All nodes announcing router advertisement
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**with** a default lifetime greater than 0 are being considered as candidates.
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In case a router is not a batman-adv originator itself, its TQ is defined by
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the originator it is connected to. This lookup uses the batman-adv global
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translation table.
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Initially the router is selected by choosing the candidate with the strongest
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TQ. When another candidate can provide a better TQ metric, that outperforms the
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currently selected router by X metric units, it will be picked as the new
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selected router. The hysteresis threshold is configurable and prevents excessive
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flapping of the gateway.
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Local routers
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-------------
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Local routers (i.e. local internet gateways connected to some nodes) that are
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connected to the client interface via cable or WLAN instead of via the mesh
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(technically: appearing in the transtable_local) are taken into account with a
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fake TQ of 512, so that they are always preferred.
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Be aware of problems if you plan to use local routers together with the
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:doc:`gluon-nftables-filter-ra-dhcp` package. These router advertisements are
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filtered anyway and reach neither the node nor any other client. Therefore the
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use of local routers is not possible as long as the package
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``gluon-radv-filterd`` is used.
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respondd module
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---------------
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This package also contains a module for respondd that announces the currently
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selected router via the ``statistics.gateway6`` property using its interface MAC
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address. Note that this is different from the ``statistics.gateway`` property,
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which contains the MAC address of the main B.A.T.M.A.N. adv slave interface of
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the selected IPv4 gateway.
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site.conf
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---------
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radv_filterd.threshold : optional
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- minimal difference in TQ value that another gateway has to be better than
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the currently chosen gateway to become the new chosen gateway
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- defaults to ``20``
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Example::
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radv_filterd = {
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threshold = 20,
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}
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