chain ( dstnat | srcnat | 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
• dstnat - a rule placed in this chain is applied before routing. The rules that replace destination
addresses of IP packets should be placed there
• srcnat - a rule placed in this chain is applied after routing. The rules that replace the source
addresses of IP packets should be placed there
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-type ( ftp | gre | h323 | irc | mms | pptp | quake3 | tftp ) - matches packets from related
connections based on information from their connection tracking helpers. A relevant connection
helper must be enabled under /ip firewall service-port
content ( text ) - the text packets should contain in order to match the rule
dst-address ( IP address | netmask | IP address | IP address ) - specifies the address range an IP
packet is destined to. Note that console converts entered address/netmask value to a valid network
address, i.e.:1.1.1.1/24 is converted to 1.1.1.0/24
dst-address-list ( name ) - matches destination address of a packet against user-defined address list
dst-address-type ( unicast | local | broadcast | multicast ) - matches destination address type of the
IP packet, one of the:
• unicast - IP addresses used for one point to another point transmission. There is only one
sender and one receiver in this case
• local - matches addresses assigned to router's interfaces
• broadcast - the IP packet is sent from one point to all other points in the IP subnetwork
• multicast - this type of IP addressing is responsible for transmission from one or more points to
a set of other points
dst-limit ( integer | time | integer | dst-address | dst-port | src-address | time ) - limits the packet per
second (pps) rate on a per destination IP or per destination port base. As opposed to the limit match,
every destination IP address / destination port has it's own limit. The options are as follows (in order
of appearance):
• Count - maximum average packet rate, measured in packets per second (pps), unless followed
by Time option
• Time - specifies the time interval over which the packet rate is measured
• Burst - number of packets to match in a burst
• Mode - the classifier(-s) for packet rate limiting
• Expire - specifies interval after which recorded IP addresses / ports will be deleted
Page 460 of 695
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