62 lines
2.4 KiB
ReStructuredText
62 lines
2.4 KiB
ReStructuredText
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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 advertisment 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 the selected by choosing the candidate with the
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strongest TQ. When another candidate can provide a better TQ metric it is not
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picked up as the selected router until it will outperform the currently
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selected router by X metric units. The hysteresis threshold is configurable
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and prevents excessive flapping of the gateway.
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"Local" routers
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---------------
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The package has functionality to select "local" routers, i.e. those connected
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via cable or WLAN instead of via the mesh (technically: appearing in the
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``transtable_local``), a fake TQ of 512 so that they are always preferred.
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However, if used together with the :doc:`gluon-ebtables-filter-ra-dhcp`
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package, these router advertisements are filtered anyway and reach neither the
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node nor any other client. You currently have to disable the package or insert
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custom ebtables rules in order to use local routers.
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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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