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197 lines
7.9 KiB
ReStructuredText
197 lines
7.9 KiB
ReStructuredText
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#########
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Conntrack
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#########
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VyOS can be configured to track connections using the connection
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tracking subsystem. Connection tracking becomes operational once either
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stateful firewall or NAT is configured.
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*********
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Configure
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*********
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.. cfgcmd:: set system conntrack table-size <1-50000000>
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:defaultvalue:
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The connection tracking table contains one entry for each connection being
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tracked by the system.
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.. cfgcmd:: set system conntrack expect-table-size <1-50000000>
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:defaultvalue:
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The connection tracking expect table contains one entry for each expected
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connection related to an existing connection. These are generally used by
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“connection tracking helper” modules such as FTP.
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The default size of the expect table is 2048 entries.
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.. cfgcmd:: set system conntrack hash-size <1-50000000>
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:defaultvalue:
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Set the size of the hash table. The connection tracking hash table makes
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searching the connection tracking table faster. The hash table uses
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“buckets” to record entries in the connection tracking table.
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.. cfgcmd:: set system conntrack modules ftp
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.. cfgcmd:: set system conntrack modules h323
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.. cfgcmd:: set system conntrack modules nfs
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.. cfgcmd:: set system conntrack modules pptp
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.. cfgcmd:: set system conntrack modules sip
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.. cfgcmd:: set system conntrack modules sqlnet
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.. cfgcmd:: set system conntrack modules tftp
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Configure the connection tracking protocol helper modules.
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All modules are enable by default.
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| Use `delete system conntrack modules` to deactive all modules.
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| Or, for example ftp, `delete system conntrack modules ftp`.
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.. cfgcmd:: set system conntrack tcp half-open-connections <1-21474836>
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:defaultvalue:
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Set the maximum number of TCP half-open connections.
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.. cfgcmd:: set system conntrack tcp loose <enable | disable>
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:defaultvalue:
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Policy to track previously established connections.
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.. cfgcmd:: set system conntrack tcp max-retrans <1-2147483647>
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:defaultvalue:
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Set the number of TCP maximum retransmit attempts.
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Contrack Timeouts
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=================
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You can define custom timeout values to apply to a specific subset of
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connections, based on a packet and flow selector. To do this, you need to
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create a rule defining the packet and flow selector.
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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description <test>
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Set a rule description.
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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destination address <ip-address>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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source address <ip-address>
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Set a destination and/or source address. Accepted input for ipv4:
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.. code-block:: none
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set system conntrack timeout custom ipv4 rule <1-999999> [source | destination] address
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Possible completions:
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<x.x.x.x> IPv4 address to match
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<x.x.x.x/x> IPv4 prefix to match
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<x.x.x.x>-<x.x.x.x> IPv4 address range to match
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!<x.x.x.x> Match everything except the specified address
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!<x.x.x.x/x> Match everything except the specified prefix
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!<x.x.x.x>-<x.x.x.x> Match everything except the specified range
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set system conntrack timeout custom ipv6 rule <1-999999> [source | destination] address
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Possible completions:
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<h:h:h:h:h:h:h:h> IP address to match
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<h:h:h:h:h:h:h:h/x> Subnet to match
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<h:h:h:h:h:h:h:h>-<h:h:h:h:h:h:h:h>
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IP range to match
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!<h:h:h:h:h:h:h:h> Match everything except the specified address
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!<h:h:h:h:h:h:h:h/x> Match everything except the specified prefix
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!<h:h:h:h:h:h:h:h>-<h:h:h:h:h:h:h:h>
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Match everything except the specified range
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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destination port <value>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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source port <value>
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Set a destination and/or source port. Accepted input:
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.. code-block:: none
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<port name> Named port (any name in /etc/services, e.g., http)
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<1-65535> Numbered port
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<start>-<end> Numbered port range (e.g., 1001-1005)
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Multiple destination ports can be specified as a comma-separated list.
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The whole list can also be "negated" using '!'. For example:
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`!22,telnet,http,123,1001-1005``
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol tcp close <1-21474836>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol tcp close-wait <1-21474836>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol tcp established <1-21474836>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol tcp fin-wait <1-21474836>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol tcp last-ack <1-21474836>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol tcp syn-recv <1-21474836>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol tcp syn-sent <1-21474836>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol tcp time-wait <1-21474836>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol udp replied <1-21474836>
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.. cfgcmd:: set system conntrack timeout custom [ipv4 | ipv6] rule <1-999999>
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protocol udp unreplied <1-21474836>
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Set the timeout in seconds for a protocol or state in a custom rule.
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Conntrack ignore rules
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======================
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.. note:: **Important note about conntrack ignore rules:**
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Starting from vyos-1.5-rolling-202406120020, ignore rules can be defined in
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``set firewall [ipv4 | ipv6] prerouting raw ...``. It's expected that in
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the future the conntrack ignore rules will be removed.
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Customized ignore rules, based on a packet and flow selector.
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.. cfgcmd:: set system conntrack ignore [ipv4 | ipv6] rule <1-999999>
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description <text>
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.. cfgcmd:: set system conntrack ignore [ipv4 | ipv6] rule <1-999999>
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destination address <ip-address>
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.. cfgcmd:: set system conntrack ignore [ipv4 | ipv6] rule <1-999999>
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destination port <port>
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.. cfgcmd:: set system conntrack ignore [ipv4 | ipv6] rule <1-999999>
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inbound-interface <interface>
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.. cfgcmd:: set system conntrack ignore [ipv4 | ipv6] rule <1-999999>
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protocol <protocol>
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.. cfgcmd:: set system conntrack ignore [ipv4 | ipv6] rule <1-999999>
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source address <ip-address>
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.. cfgcmd:: set system conntrack ignore [ipv4 | ipv6] rule <1-999999>
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source port <port>
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.. cfgcmd:: set system conntrack ignore [ipv4 | ipv6] rule <1-999999>
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tcp flags [not] <text>
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Allowed values fpr TCP flags: ``ack``, ``cwr``, ``ecn``, ``fin``, ``psh``,
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``rst``, ``syn`` and ``urg``. Multiple values are supported, and for
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inverted selection use ``not``, as shown in the example.
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Conntrack log
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=============
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.. cfgcmd:: set system conntrack log icmp destroy
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.. cfgcmd:: set system conntrack log icmp new
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.. cfgcmd:: set system conntrack log icmp update
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.. cfgcmd:: set system conntrack log other destroy
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.. cfgcmd:: set system conntrack log other new
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.. cfgcmd:: set system conntrack log other update
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.. cfgcmd:: set system conntrack log tcp destroy
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.. cfgcmd:: set system conntrack log tcp new
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.. cfgcmd:: set system conntrack log tcp update close-wait
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.. cfgcmd:: set system conntrack log tcp update established
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.. cfgcmd:: set system conntrack log tcp update fin-wait
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.. cfgcmd:: set system conntrack log tcp update last-ack
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.. cfgcmd:: set system conntrack log tcp update syn-received
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.. cfgcmd:: set system conntrack log tcp update time-wait
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.. cfgcmd:: set system conntrack log udp destroy
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.. cfgcmd:: set system conntrack log udp new
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.. cfgcmd:: set system conntrack log udp update
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Log the connection tracking events per protocol. |