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• add-dst-to-address-list - adds destination address of an IP packet to the address list specified
by address-list parameter
• add-src-to-address-list - adds source address of an IP packet to the address list specified by
address-list parameter
• drop - silently drop the packet (without sending the ICMP reject message)
• jump - jump to the chain specified by the value of the jump-target parameter
• log - each match with this action will add a message to the system log
• passthrough - ignores this rule and goes on to the next one
• reject - reject the packet and send an ICMP reject message
• return - passes control back to the chain from where the jump took place
• tarpit - captures and holds incoming TCP connections (replies with SYN/ACK to the inbound
TCP SYN packet)
address-list ( name ) - specifies the name of the address list to collect IP addresses from rules
having action=add-dst-to-address-list or action=add-src-to-address-list actions. These address lists
could be later used for packet matching
address-list-timeout ( time ; default: 00:00:00 ) - 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
• 00:00:00 - leave the address in the address list forever
chain ( forward | input | output | name ) - specifies the chain to put a particular rule into. As the
different traffic is passed through different chains, always be careful in choosing the right chain for
a new rule. If the input does not match the name of an already defined chain, a new chain will be
created
comment ( text ) - a descriptive comment for the rule. A comment can be used to identify rules
form scripts
connection-bytes ( integer | integer ) - matches packets only if a given amount of bytes has been
transfered through the particular connection
• 0 - means infinity, exempli gratia: connection-bytes=2000000-0 means that the rule matches if
more than 2MB has been transfered through the relevant connection
connection-limit ( integer | netmask ) - restrict connection limit per address or address block
connection-mark ( name ) - matches packets marked via mangle facility with particular connection
mark
connection-state ( estabilished | invalid | new | related ) - interprets the connection tracking
analysis data for a particular packet
• estabilished - a packet which belongs to an existing connection, exempli gratia a reply packet
or a packet which belongs to already replied connection
• invalid - a packet which could not be identified for some reason. This includes out of memory
condition and ICMP errors which do not correspond to any known connection. It is generally
advised to drop these packets
• new - a packet which begins a new TCP connection
• related - a packet which is related to, but not part of an existing connection, such as ICMP
errors or a packet which begins FTP data connection (the later requires enabled FTP connection
tracking helper under /ip firewall service-port)
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