IP Firewall&Mangle

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Mangle

Document revision: 3 (Fri Nov 04 19:22:14 GMT 2005)
Applies to: V2.9

General Information

Summary

The mangle facility allows to mark IP packets with special marks. These marks are used by various other router facilities to identify the packets. Additionaly, the mangle facility is used to modify some fields in the IP header, like TOS (DSCP) and TTL fields.

Specifications

Packages required: system
License required: Level1
Submenu level: /ip firewall mangle
Standards and Technologies: IP
Hardware usage: Increases with count of mangle rules
Related Documents

Software Package Management
IP Addresses and ARP
Routes, Equal Cost Multipath Routing, Policy Routing
NAT
Filter
Packet Flow
Mangle

Submenu level: /ip firewall mangle
Description

Mangle is a kind of 'marker' that marks packets for future processing with special marks. Many other facilities in RouterOS make use of these marks, e.g. queue trees and NAT. They identify a packet based on its mark and process it accordingly. The mangle marks exist only within the router, they are not transmitted across the network.

Property Description

action (accept | add-dst-to-address-list | add-src-to-address-list | change-mss | change-tos | change-ttl | jump | log | mark-connection | mark-packet | mark-routing | passthrough | return | strip-ipv4-options; default: accept) - action to undertake if the packet matches the rule
accept - accept the packet. No action, i.e., the packet is passed through and no more rules are applied to it
add-dst-to-address-list - add destination address of an IP packet to the address list specified by address-list parameter
add-src-to-address-list - add source address of an IP packet to the address list specified by address-list parameter
change-mss - change Maximum Segment Size field value of the packet to a value specified by the new-mss parameter
change-tos - change Type of Service field value of the packet to a value specified by the new-tos parameter
change-ttl - change Time to Live field value of the packet to a value specified by the new-ttl parameter
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
mark-connection - place a mark specified by the new-connection-mark parameter on the entire connection that matches the rule
mark-packet - place a mark specified by the new-packet-mark parameter on a packet that matches the rule
mark-routing - place a mark specified by the new-routing-mark parameter on a packet. This kind of marks is used for policy routing purposes only
passthrough - ignore this rule go on to the next one
return - pass control back to the chain from where the jump took place
strip-ipv4-options - strip IPv4 option fields from the IP packet
address-list (name) - specify 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 | postrouting | prerouting) - specify 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) - free form textual comment for the rule. A comment can be used to refer the particular rule from scripts
connection-bytes (integer-integer) - match 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) - match packets marked via mangle facility with particular connection mark
connection-type (ftp | gre | h323 | irc | mms | pptp | quake3 | tftp) - match 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) - specify 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) - match destination address of a packet against user-defined address list
dst-address-type (unicast | local | broadcast | multicast) - match 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 - match 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{0,1},integer,dst-address | dst-port | src-address{+},time{0,1}) - limit 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
dst-port (integer: 0..65535-integer: 0..65535{*}) - destination port number or range
hotspot (multiple choice: from-client | auth | local-dst | http) - match packets received from clients against various Hot-Spot. All values can be negated
from-client - true, if a packet comes from HotSpot client
auth - true, if a packet comes from authenticted client
local-dst - true, if a packet has local destination IP address
hotspot - true, if it is a TCP packet from client and either the transparent proxy on port 80 is enabled or the client has a proxy address configured and this address is equal to the address:port pair of the IP packet
icmp-options (integer:integer) - match ICMP Type:Code fields
in-interface (name) - interface the packet has entered the router through
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) - match ipv4 header options
any - match packet with at least one of the ipv4 options
loose-source-routing - match packets with loose source routing option. This option is used to route the internet datagram based on information supplied by the source
no-record-route - match packets with no record route option. This option is used to route the internet datagram based on information supplied by the source
no-router-alert - match packets with no router alter option
no-source-routing - match packets with no source routing option
no-timestamp - match packets with no timestamp option
record-route - match packets with record route option
router-alert - match packets with router alter option
strict-source-routing - match packets with strict source routing option
timestamp - match packets with timestamp
jump-target (forward | input | output | postrouting | preroutingname) - name of the target chain to jump to, if the action=jump is used
limit (integer/time{0,1},integer) - restrict packet match rate to a given limit. Usefull to reduce the amount of log messages
Count - maximum average packet rate, measured in packets per second (pps), unless followed by Time option
Time - specify the time interval over which the packet rate is measured
Burst - number of packets to match in a burst
log-prefix (text) - all messages written to logs will contain the prefix specified herein. Used in conjunction with action=log
new-connection-mark (name) - specify the new value of the connection mark to be used in conjunction with action=mark-connection
new-mss (integer) - specify MSS value to be used in conjunction with action=change-mss
new-packet-mark (name) - specify the new value of the packet mark to be used in conjunction with action=mark-packet
new-routing-mark (name) - specify the new value of the routing mark used in conjunction with action=mark-routing
new-tos (max-reliability | max-throughput | min-cost | min-delay | normal integer) - specify TOS value to be used in conjunction with action=change-tos
max-reliability - maximize reliability (ToS=4)
max-throughput - maximize throughput (ToS=8)
min-cost - minimize monetary cost (ToS=2)
min-delay - minimize delay (ToS=16)
normal - normal service (ToS=0)
new-ttl (decrement | increment | set:integer) - specify the new TTL field value used in conjunction with action=change-ttl
decrement - the value of the TTL field will be decremented for value
increment - the value of the TTL field will be incremented for value
set: - the value of the TTL field will be set to value
nth (integer,integer: 0..15,integer{0,1}) - match a particular Nth packet received by the rule. One of 16 available counters can be used to count packets
Every - match every Every+1th packet. For example, if Every=1 then the rule matches every 2nd packet
Counter - specifies which counter to use. A counter increments each time the rule containing nth match matches
Packet - match on the given packet number. The value by obvious reasons must be between 0 and Every. If this option is used for a given counter, then there must be at least Every+1 rules with this option, covering all values between 0 and Every inclusively.
out-interface (name) - match the interface name a packet left the router through
p2p (all-p2p | bit-torrent | direct-connect | edonkey | fasttrack | gnutella | soulseek | warez | winmx) - match packets belonging to connections of the above P2P protocols
packet-mark (name) - match the packets marked in mangle with specific packet mark
packet-size (integer: 0..65535-integer: 0..65535{0,1}) - matches packet of the specified size or size range in bytes
Min - specifies lower boundary of the size range or a standalone value
Max - specifies upper boundary of the size range
passthrough (yes | no; default: yes) - whether to let the packet to pass further (like action passthrough) after marking it with a given mark (property only valid if action is mark packet, connection or routing mark)
phys-in-interface (name) - matches the bridge port physical input device added to a bridge device. It is only useful if the packet has arrived through the bridge
protocol (ddp | egp | encap | ggp | gre | hmp | icmp | idrp-cmtp | igmp | ipencap | ipip | ipsec-ah | ipsec-esp | iso-tp4 | ospf | pup | rdp | rspf | st | tcp | udp | vmtp | xns-idp | xtp | integer) - matches particular IP protocol specified by protocol name or number. You should specify this setting if you want to specify ports
psd (integer,time,integer,integer) - attempts to detect TCP and UDP scans. It is advised to assign lower weight to ports with high numbers to reduce the frequency of false positives, such as from passive mode FTP transfers
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 - weight of the packets with privileged (<=1024) destination port
HighPortWeight - weight of the packet with non-priviliged destination port
random (integer: 1..99) - matches packets randomly with given propability
routing-mark (name) - matches packets marked with the specified routing mark
src-address (IP address/netmask | IP address-IP address) - specifies the address range an IP packet is originated from. 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
src-address-list (name) - matches source address of a packet against user-defined address list
src-address-type (unicast | local | broadcast | multicast) - matches source 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
src-mac-address (MAC address) - source MAC address
src-port (integer: 0..65535-integer: 0..65535{*}) - source port number or range
tcp-flags (multiple choice: ack | cwr | ece | fin | psh | rst | syn | urg) - tcp flags to match
ack - acknowledging data
cwr - congestion window reduced
ece - ECN-echo flag (explicit congestion notification)
fin - close connection
psh - push function
rst - drop connection
syn - new connection
urg - urgent data
tcp-mss (integer: 0..65535) - matches TCP MSS value of an IP packet
time (time-time,sat | fri | thu | wed | tue | mon | sun{+}) - allows to create filter based on the packets' arrival time and date or, for locally generated packets, departure time and date
tos (max-reliability | max-throughput | min-cost | min-delay | normal) - specifies a match for the value of Type of Service (ToS) field of an IP header
max-reliability - maximize reliability (ToS=4)
max-throughput - maximize throughput (ToS=8)
min-cost - minimize monetary cost (ToS=2)
min-delay - minimize delay (ToS=16)
normal - normal service (ToS=0)
Notes

Instead of making two rules if you want to mark a packet, connection or routing-mark and finish mangle table processing on that event (in other words, mark and simultaneously accept the packet), you may disable the set by default passthrough property of the marking rule.

Usually routing-mark is not used for P2P, since P2P traffic always is routed over a default getaway.

Application Examples

Description

The following section discusses some examples of using the mangle facility.

Peer-to-Peer Traffic Marking

To ensure the quality of service for network connection, interactive traffic types such as VoIP and HTTP should be prioritized over non-interactive, such as peer-to-peer network traffic. RouterOS QOS implementation uses mangle to mark different types of traffic first, and then place them into queues with different limits.

The following example enforces the P2P traffic will get no more than 1Mbps of the total link capacity when the link is heavily used by other traffic otherwice expanding to the full link capacity:

[admin@MikroTik] > /ip firewall mangle add chain=forward \
\... p2p=all-p2p action=mark-connection new-connection-mark=p2p_conn
[admin@MikroTik] > /ip firewall mangle add chain=forward \
\... connection-mark=p2p_conn action=mark-packet new-packet-mark=p2p
[admin@MikroTik] > /ip firewall mangle add chain=forward \
\... connection-mark=!p2p_conn action=mark-packet new-packet-mark=other
[admin@MikroTik] > /ip firewall mangle print
Flags: X - disabled, I - invalid, D - dynamic
0 chain=forward p2p=all-p2p action=mark-connection new-connection-mark=p2p_conn

1 chain=forward connection-mark=p2p_conn action=mark-packet new-packet-mark=p2p

2 chain=forward packet-mark=!p2p_conn action=mark-packet new-packet-mark=other
[admin@MikroTik] >
[admin@MikroTik] > /queue tree add parent=Public packet-mark=p2p limit-at=1000000 \
\... max-limit=100000000 priority=8
[admin@MikroTik] > /queue tree add parent=Local packet-mark=p2p limit-at=1000000 \
\... max-limit=100000000 priority=8
[admin@MikroTik] > /queue tree add parent=Public packet-mark=other limit-at=1000000 \
\... max-limit=100000000 priority=1
[admin@MikroTik] > /queue tree add parent=Local packet-mark=other limit-at=1000000 \
\... max-limit=100000000 priority=1
Mark by MAC address

To mark traffic from a known MAC address which goes to the router or through it, do the following:

[admin@MikroTik] > / ip firewall mangle add chain=prerouting \
\... src-mac-address=00:01:29:60:36:E7 action=mark-connection new-connection-mark=known_mac_conn
[admin@MikroTik] > / ip firewall mangle add chain=prerouting \
\... connection-mark=known_mac_conn action=mark-packet new-packet-mark=known_mac

Change MSS

It is a well known fact that VPN links have smaller packet size due to incapsulation overhead. A large packet with MSS that exceeds the MSS of the VPN link should be fragmented prior to sending it via that kind of connection. However, if the packet has DF flag set, it cannot be fragmented and should be discarded. On links that have broken path MTU discovery (PMTUD) it may lead to a number of problems, including problems with FTP and HTTP data transfer and e-mail services.

In case of link with broken PMTUD, a decrease of the MSS of the packets coming through the VPN link solves the problem. The following example demonstrates how to decrease the MSS value via mangle:

[admin@MikroTik] > /ip firewall mangle add out-interface=pppoe-out \
\... protocol=tcp tcp-flags=syn action=change-mss new-mss=1300 chain=forward
[admin@MikroTik] > /ip firewall mangle print
Flags: X - disabled, I - invalid, D - dynamic
0 chain=forward out-interface=pppoe-out protocol=tcp tcp-flags=syn
action=change-mss new-mss=1300

[admin@MikroTik] >

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[url]http://www.mikrotik.com/testdocs/ros/2.9/ip/mangle.php[/url]

[URL="http://www.mikrotik.com/testdocs/ros/2.9/ip/mangle.php"]http://www.mikrotik.com/testdocs/ros/2.9/ip/mangle.php[/URL]
:blush::lol:

ممنون از این همه توجه!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

بهتر نبود ترجمش میکردید ؟
بهتر طریقه کار با winbox و mangle توضیح بدید.
چون کمتر کسی با خط فرمان میکروتیک کار میکنه.