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146 lines
5.8 KiB
ReStructuredText
===========================
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Virtual IPs
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===========================
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When using additional addresses for features like NAT or binding services to different interfaces, you can
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add extra addresses to already defined interfaces using **Virtual IPs**.
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.. Note::
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Virtual IPs also play a vital role in :doc:`high availability </manual/hacarp>` setups
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--------------------------
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Types and their usage
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--------------------------
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.. _Firewall_VIP_Types:
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OPNsense supports different types of virtual addresses all with their specific purposes, which we will explain below.
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..................
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IP Alias
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..................
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A standard extra address, which you can use to bind services to or use in
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NAT rules.
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The address will act like a normal interface address, which means
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it will respond to ICMP ping requests and will generate ARP traffic
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(OSI layer 2).
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Additionally you can add an alias into an existing CARP group
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(by setting its VHID).
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Usually the subnet mask should match the interfaces or be defined as a single address (/32 or /128).
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CARP
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Specifies an address for use in a high availability cluster, acts like a
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regular address when the node is in MASTER state.
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Internally a custom mac address is generated needed for the protocol.
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More information about CARP can be found in our :doc:`high availability </manual/hacarp>` section.
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.. Note::
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The virtual MAC address of a CARP interface is :code:`00:00:5e:00:01:XX`, where the last two digits will be
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populated by its vhid.
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.. Note::
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CARP uses IP protocol number 112 (0x70), to detect priority it will send out advertisements using
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:code:`224.0.0.18` or :code:`FF02::12`.
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Proxy ARP
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Does not add a real address to an interface, instead it will use `choparp <https://www.freebsd.org/cgi/man.cgi?query=choparp>`__ to reply to
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arp requests on the network. This can sometimes be practical in situations where clients should be let to believe an address is local.
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Other
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The **other** type won't respond to ICMP ping messages or reply to ARP requests, it merely is a definition of an
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address (or range) which can be used in NAT rules.
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--------------------
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Settings
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--------------------
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The interface should validate suitable combinations of settings, below you will find a detailed explanation for
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everyone of them.
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=====================================================================================================================
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==================================== ===============================================================================
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Mode The type of address, as defined in :ref:`Types <Firewall_VIP_Types>`.
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Interface The interface this address belongs to.
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Type Either Network or Single address, only has affect when creating NAT rules,
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where **Proxy ARP** and **Other** combined with **Expansion** will generate
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separate addresses for all items in the netmask.
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Expansion When applicable, expand netmask to separate addresses.
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Address The address and netmask to assign, when assigning multiple addresses in the
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same network, the masks usually should match.
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Gateway Only applies to **IP Alias** types, usually this field should be empty, except
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some tunnel devices (ppp/pppoe/tun) expect the gateway address to be defined.
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Virtual IP Password The password used to encrypt CARP packets over the network, should be the
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same on preferred master and backup node(s).
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VHID Group The Virtual Host ID. This is a unique number that is used to
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identify the redundancy group to other nodes in the group,
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and to distinguish between groups on the same network.
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Acceptable values are from 1 to 255.
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This must be the same on all members of the group.
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Advertising Frequency Defines how often is advertised that this interface is part of a group
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(:code:`Base` defined in seconds) and how much to **skew** when sending
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advertisements. A higher :code:`skew` means less preferred.
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Description User friendly description of this VIP
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==================================== ===============================================================================
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Status
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--------------------
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The status page shows all configured carp VHID groups and their active status.
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Our status screen also offers some buttons to disable carp or force a node into maintenance mode.
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All different statuses are detailed below.
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INIT
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Usually this indicates there is an issue with the interface, often this relates to not disconnected interfaces
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or other technical problems.
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BACKUP
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In backup state this interface is part of a cluster and listening to advertisements.
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If for some reason it won't receive advertisements for a short period of time, it will transition to master.
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MASTER
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Marks the active node, while listening to advertisements seen on the network. If another node is seen with a better
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advertisement it might transition to backup
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(depending on :code:`preempt` setting, found on the :menuselection:`System --> High Availability --> Settings` page).
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DISABLED
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Displayed when **Temporarily Disable CARP** is clicked on this page.
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