Property | Description |
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action (action name; Default: accept) | Action to take if a packet is matched by the rule:- accept - accept the packet. A packet is not passed to the next firewall rule.
- add-dst-to-address-list - add destination address to address list specified by
address-list parameter - add-src-to-address-list - add source address to address list specified by
address-list parameter - drop - silently drop the packet
- fasttrack-connection - process packets from a connection using FastPath by enabling FastTrack for the connection
- jump - jump to the user-defined chain specified by the value of
jump-target parameter - log - add a message to the system log containing the following data: in-interface, out-interface, src-mac, protocol, src-ip:port->dst-ip:port and length of the packet. After a packet is matched it is passed to the next rule in the list, similar as
passthrough - passthrough - if a packet is matched by the rule, increase counter and go to next rule (useful for statistics)
- reject - drop the packet and send an ICMP reject message; this action allows ICMP reply specification, such as: prohibit or unreachable admin/host/network/port
- return - passes control back to the chain from where the jump took place
- tarpit - captures and holds TCP connections (replies with SYN/ACK to the inbound TCP SYN packet)
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address-list-timeout (none-dynamic | none-static | time; Default: none-dynamic) | Time interval after which the address will be removed from the address list specified by address-list parameter. Used in conjunction with add-dst-to-address-list or add-src-to-address-list actions
- Value of
none-dynamic (00:00:00 ) will leave the address in the address list till reboot - Value of
none-static will leave the address in the address list forever and will be included in the configuration export/backup
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chain (name; Default: ) | Specifies to which chain rule will be added. If the input does not match the name of an already defined chain, a new chain will be created |
comment (string; Default: ) | Descriptive comment for the rule |
connection-bytes (integer-integer; Default: ) | Matches packets only if a given amount of bytes has been transferred through the particular connection. 0 - means infinity, for example connection-bytes=2000000-0 means that the rule matches if more than 2MB has been transferred through the relevant connection |
connection-limit (integer,netmask; Default: ) | Matches connections per address or address block after a given value is reached. Should be used together with connection-state=new and/or with tcp-flags=syn because matcher is very resource-intensive |
connection-mark (no-mark | string; Default: ) | Matches packets marked via mangle facility with particular connection mark. If no-mark is set, the rule will match any unmarked connection |
connection-nat-state (srcnat | dstnat; Default: ) | Can match connections that are srcnatted, distracted, or both. Note that connection-state=related connections connection-nat-state is determined by the direction of the first packet. and if connection tracking needs to use dst-nat to deliver this connection to the same hosts as the main connection it will be in connection-nat-state=dstnat even if there are no dst-nat rules at all |
connection-rate (Integer 0..4294967295; Default: ) | Connection Rate is a firewall matcher that allows capturing traffic based on the present speed of the connection |
connection-state (established | invalid | new | related | untracked; Default: ) | Interprets the connection tracking analytics data for a particular packet:established - a packet that belongs to an existing connectioninvalid - a packet that does not have a determined state in connection tracking (usually - severe out-of-order packets, packets with wrong sequence/ack number, or in case of a resource over usage on the router), for this reason, an invalid packet will not participate in NAT (as only connection-state=new packets do), and will still contain original source IP address when routed. We strongly suggest dropping all connection-state=invalid packets in the firewall filter forward and input chainsnew - the packet has started a new connection or is otherwise associated with a connection that has not seen packets in both directions.related - a packet that is related to, but not parts of an existing connection, such as ICMP errors or a packet that begins an FTP data connectionuntracked - packet which was set to bypass connection tracking in firewall RAW tables.
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connection-type (ftp | h323 | irc | pptp | quake3 | sip | tftp; Default: ) | Matches packets from related connections based on information from their connection tracking helpers. A relevant connection helper must be enabled under the: /ip firewall service-port |
content (string; Default: ) | Match packets that contain specified text |
dscp (integer: 0..63; Default: ) | Matches DSCP IP header field. |
dst-address (IP/netmask | IP range; Default: ) | Matches packets whose destination is equal to the specified IP or falls into the specified IP range. |
dst-address-list (name; Default: ) | Matches the destination address of a packet against a user-defined address-list. |
dst-address-type (unicast | local | broadcast | multicast ) | Matches destination address type:unicast - IP address used for point to point transmissionlocal - if dst-address is assigned to one of the router's interfacesbroadcast - packet is sent to all devices in a subnetmulticast - packet is forwarded to a defined group of devices
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dst-limit (integer[/time],integer,dst-address | dst-port | src-address[/time]; Default: ) | Matches packets until a given rate is exceeded. Rate is defined as packets per time interval. As opposed to the limit matcher, every flow has its own limit. Flow is defined by a mode parameter. Parameters are written in the following format: rate[/time],burst,mode[/expire] .- rate - packet count per time interval per-flow to match
- time - specifies the time interval in which the packet count rate per flow cannot be exceeded (optional, 1s will be used if not specified)
- burst - initial number of packets per flow to match: this number gets recharged by one every
time /rate , up to this number - mode - this parameter specifies what unique fields define flow (src-address, dst-address, src-and-dst-address, dst-address-and-port, addresses-and-dst-port)
- expire - specifies interval after which flow with no packets will be allowed to be deleted (optional)
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dst-port (integer[-integer]: 0..65535; Default: ) | List of destination port numbers or port number ranges |
fragment (yes|no; Default: ) | Matches fragmented packets. The first (starting) fragment does not count. If connection tracking is enabled there will be no fragments as the system automatically assembles every packet |
hotspot (auth | from-client | http | local-dst | to-client; Default: ) | Matches packets received from HotSpot clients against various HotSpot matchers.auth - matches authenticated HotSpot client packetsfrom-client - matches packets that are coming from the HotSpot clienthttp - matches HTTP requests sent to the HotSpot serverlocal-dst - matches packets that are destined to the HotSpot serverto-client - matches packets that are sent to the HotSpot client
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icmp-options (integer:integer; Default: ) | Matches ICMP type: code fields |
in-bridge-port (name; Default: ) | Actual interface the packet has entered the router if the incoming interface is a bridge. Works only if use-ip-firewall is enabled in bridge settings. |
in-bridge-port-list (name; Default: ) | Set of interfaces defined in interface list. Works the same as in-bridge-port |
in-interface (name; Default: ) | Interface the packet has entered the router |
in-interface-list (name; Default: ) | Set of interfaces defined in interface list. Works the same as in-interface |
ingress-priority (integer: 0..63; Default: ) | Matches the priority of an ingress packet. Priority may be derived from VLAN, WMM, DSCP, or MPLS EXP bit. read more |
ipsec-policy (in | out, ipsec | none; Default: ) | Matches the policy used by IPsec. Value is written in the following format: direction, policy . The direction is Used to select whether to match the policy used for decapsulation or the policy that will be used for encapsulation.in - valid in the PREROUTING, INPUT, and FORWARD chainsout - valid in the POSTROUTING, OUTPUT, and FORWARD chains
ipsec - matches if the packet is subject to IPsec processing;none - matches packets that are not subject to IPsec processing (for example, IPSec transport packet).
For example, if a router receives an IPsec encapsulated Gre packet, then rule ipsec-policy=in,ipsec will match Gre packet, but a rule ipsec-policy=in,none will match the ESP packet. |
ipv4-options (any | loose-source-routing | no-record-route | no-router-alert | no-source-routing | no-timestamp | none | record-route | router-alert | strict-source-routing | timestamp; Default: ) | Matches IPv4 header options.any - match packet with at least one of the ipv4 optionsloose-source-routing - match packets with a loose source routing option. This option is used to route the internet datagram based on information supplied by the sourceno-record-route - match packets with no record route option. This option is used to route the internet datagram based on information supplied by the sourceno-router-alert - match packets with no router alter optionno-source-routing - match packets with no source routing optionno-timestamp - match packets with no timestamp optionrecord-route - match packets with record route optionrouter-alert - match packets with router alter optionstrict-source-routing - match packets with a strict source routing optiontimestamp - match packets with a timestamp
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jump-target (name; Default: ) | Name of the target chain to jump to. Applicable only if action=jump |
layer7-protocol (name; Default: ) | Layer7 filter name defined in layer7 protocol menu. |
limit (integer,time,integer; Default: ) | Matches packets up to a limited rate (packet rate or bit rate). A rule using this matcher will match until this limit is reached. Parameters are written in the following format: rate[/time],burst:mode .- rate - packet or bit count per time interval to match
- time - specifies the time interval in which the packet or bit rate cannot be exceeded (optional, 1s will be used if not specified)
- burst - initial number of packets or bits to match: this number gets recharged every 10ms so burst should be at least 1/100 of a rate per second
- mode - packet or bit mode
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log (yes | no; Default: no) | Add a message to the system log containing the following data: in-interface, out-interface, src-mac, protocol, src-ip:port->dst-ip:port, and length of the packet. |
log-prefix (string; Default: ) | Adds specified text at the beginning of every log message. Applicable if action=log or log=yes configured. |
nth (integer,integer; Default: ) | Matches every nth packet: nth=2,1 rule will match every first packet of 2, hence, 50% of all the traffic that is matched by the rule |
out-bridge-port (name; Default: ) | Actual interface the packet leaves the router if the outgoing interface is a bridge. Works only if use-ip-firewall is enabled in bridge settings. |
out-bridge-port-list (name; Default: ) | Set of interfaces defined in interface list. Works the same as out-bridge-port |
out-interface (; Default: ) | Interface the packet is leaving the router |
out-interface-list (name; Default: ) | Set of interfaces defined in interface list. Works the same as out-interface |
packet-mark (no-mark | string; Default: ) | Matches packets marked via mangle facility with particular packet mark. If no-mark is set, the rule will match any unmarked packet. |
packet-size (integer[-integer]:0..65535; Default: ) | Matches packets of specified size or size range in bytes. |
per-connection-classifier (ValuesToHash:Denominator/Remainder; Default: ) | PCC matcher allows dividing traffic into equal streams with the ability to keep packets with a specific set of options in one particular stream. Read more >> |
port (integer[-integer]: 0..65535; Default: ) | Matches if any (source or destination) port matches the specified list of ports or port ranges. Applicable only if protocol is TCP or UDP |
priority (integer: 0..63; Default:) | Matches the packet's priority after a new priority has been set. Priority may be derived from VLAN, WMM, DSCP, MPLS EXP bit, or from the priority that has been set using the set-priority action. Read more |
protocol (name or protocol ID; Default: tcp) | Matches particular IP protocol specified by protocol name or number |
psd (integer,time,integer,integer; Default: ) | Attempts to detect TCP and UDP scans. Parameters are in the following format WeightThreshold, DelayThreshold, LowPortWeight, HighPortWeight - WeightThreshold - total weight of the latest TCP/UDP packets with different destination ports coming from the same host to be treated as port scan sequence
- DelayThreshold - delay for the packets with different destination ports coming from the same host to be treated as possible port scan subsequence
- LowPortWeight - the weight of the packets with privileged (<1024) destination port
- HighPortWeight - the weight of the packet with a non-privileged destination port
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random (integer: 1..99; Default: ) | Matches packets randomly with a given probability |
reject-with (icmp-admin-prohibited | icmp-net-prohibited | icmp-protocol-unreachable | icmp-host-prohibited | icmp-network-unreachable | tcp-reset | icmp-host-unreachable | icmp-port-unreachable; Default: icmp-network-unreachable) | Specifies ICMP error to be sent back if the packet is rejected. Applicable if action=reject
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routing-table (string; Default: ) | Matches packets whose destination address is resolved in specific a routing table. |
routing-mark (string; Default: ) | Matches packets marked by mangle facility with particular routing mark |
src-address (Ip/Netmask, Ip range; Default: ) | Matches packets whose source is equal to a specified IP or falls into a specified IP range |
src-address-list (name; Default: ) | Matches the source address of a packet against a user-defined address list |
src-address-type (unicast | local | broadcast | multicast | blackhole | prohibit | unreachable ; Default: ) | mote{ta{tableMatches source address type: - unicast - IP address used for point to point transmission
- local - if an address is assigned to one of the router's interfaces
- broadcast - packet is sent to all devices in the subnet
- multicast - packet is forwarded to a defined group of devices
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src-port (integer[-integer]: 0..65535; Default: ) | List of source ports and ranges of source ports. Applicable only if a protocol is TCP or UDP |
src-mac-address (MAC address; Default: ) | Matches the source MAC address of the packet |
tcp-flags (ack | cwr | ece | fin | psh | rst | syn | urg; Default: ) | Matches specified TCP flagsack - acknowledging datacwr - congestion window reducedece - ECN-echo flag (explicit congestion notification)fin - close connectionpsh - push functionrst - drop connectionsyn - new connectionurg - urgent data
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tcp-mss (integer[-integer]: 0..65535; Default: ) | Matches TCP MSS value of an IP packet |
time (time-time,sat | fri | thu | wed | tue | mon | sun; Default: ) | Allows to create a filter based on the packets' arrival time and date or, for locally generated packets, departure time and date |
tls-host (string; Default: ) | Allows matching HTTPS traffic based on TLS SNI hostname. Accepts GLOB syntax for wildcard matching. Note that the matcher will not be able to match the hostname if the TLS handshake frame is fragmented into multiple TCP segments (packets).
Watch our video about this value. |
ttl (integer: 0..255; Default: ) | Matches packets TTL value |