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| -rw-r--r-- | docs/configuration/service/mdns.rst | 69 |
1 files changed, 58 insertions, 11 deletions
diff --git a/docs/configuration/service/mdns.rst b/docs/configuration/service/mdns.rst index 9d6a292a..dcb01207 100644 --- a/docs/configuration/service/mdns.rst +++ b/docs/configuration/service/mdns.rst @@ -5,33 +5,49 @@ Starting with VyOS 1.2 a :abbr:`mDNS (Multicast DNS)` repeater functionality is provided. Additional information can be obtained from https://en.wikipedia.org/wiki/Multicast_DNS. -Multicast DNS uses the 224.0.0.251 address, which is "administratively scoped" -and does not leave the subnet. It retransmits mDNS packets from one interface -to other interfaces. This enables support for e.g. Apple Airplay devices across -multiple VLANs. +Multicast DNS uses the reserved address ``224.0.0.251``, which is +`"administratively scoped"` and does not leave the subnet. mDNS repeater +retransmits mDNS packets from one interface to other interfaces. This enables +support for devices using mDNS discovery (like network printers, Apple Airplay, +Chromecast, various IP based home-automation devices etc) across multiple VLANs. -Since the mDNS protocol sends the AA records in the packet itself, the repeater -does not need to forge the source address. Instead, the source address is of -the interface that repeats the packet. +Since the mDNS protocol sends the :abbr:`AA(Authoritative Answer)` records in +the packet itself, the repeater does not need to forge the source address. +Instead, the source address is of the interface that repeats the packet. Configuration ============= .. cfgcmd:: set service mdns repeater interface <interface> - To enable mDNS repeater you need to configure at least two interfaces. To - re-broadcast all incoming mDNS packets from any interface configured here to - any other interface configured under this section. + To enable mDNS repeater you need to configure at least two interfaces so that + all incoming mDNS packets from one interface configured here can be + re-broadcasted to any other interface(s) configured under this section. .. cfgcmd:: set service mdns repeater disable mDNS repeater can be temporarily disabled without deleting the service using +.. cfgcmd:: set service mdns repeater ip-version <ipv4 | ipv6 | both> + + mDNS repeater can be enabled either on IPv4 socket or on IPv6 socket or both + to re-broadcast. By default, mDNS repeater will listen on both IPv4 and IPv6. + +.. cfgcmd:: set service mdns repeater allow-service <service> + + mDNS repeater can be configured to re-broadcast only specific services. By + default, all services are re-broadcasted. + +.. cfgcmd:: set service mdns repeater browse-domain <domain> + + Allow listing additional custom domains to be browsed (in addition to the + default ``local``) so that they can be reflected. + .. note:: You can not run this in a VRRP setup, if multiple mDNS repeaters are launched in a subnet you will experience the mDNS packet storm death! Example -======= +------- To listen on both `eth0` and `eth1` mDNS packets and also repeat packets received on `eth0` to `eth1` (and vice-versa) use the following commands: @@ -41,4 +57,35 @@ received on `eth0` to `eth1` (and vice-versa) use the following commands: set service mdns repeater interface 'eth0' set service mdns repeater interface 'eth1' +To allow only specific services, for example ``_airplay._tcp`` or ``_ipp._tcp``, +(instead of all services) to be re-broadcasted, use the following command: + +.. code-block:: none + + set service mdns repeater allow-service '_airplay._tcp' + set service mdns repeater allow-service '_ipp._tcp' + +To allow listing additional custom domain, for example +``openthread.thread.home.arpa``, so that it can reflected in addition to the +default ``local``, use the following command: + +.. code-block:: none + + set service mdns repeater browse-domain 'openthread.thread.home.arpa' + .. _`Multicast DNS`: https://en.wikipedia.org/wiki/Multicast_DNS + +Operation +========= + +.. opcmd:: restart mdns repeater + + Restart mDNS repeater service. + +.. opcmd:: show log mdns repeater + + Show logs for mDNS repeater service. + +.. opcmd:: monitor log mdns repeater + + Follow the logs for mDNS repeater service. |