MikroTik RouterOSâ¢ v2.9

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NAT Document revision 2.7 (Fri Nov 04 16:05:13 GMT 2005) This document applies to MikroTik RouterOS V2.8 Table of Contents Table of Contents Summary Specifications Related Documents NAT Description Property Description NAT Applications Description Example of Source NAT (Masquerading) Example of Destination NAT Example of 1:1 mapping General Information Summary Network Address Translation (NAT) is a router facility that replaces source and (or) destination IP addresses of the IP packet as it pass through thhe router. It is most commonly used to enable multiple host on a private network to access the Internet using a single public IP address. Specifications Packages required: system License required: level1 (number of rules limited to 1), level3 Home menu level: /ip firewall nat Standards and Technologies: IP, RFC1631, RFC2663 Hardware usage: Increases with the count of rules Related Documents • Software Package Management • IP Addresses and ARP • Routes, Equal Cost Multipath Routing, Policy Routing • Filter • Mangle • Packet Flow Page 395 of 615 Copyright 1999-2005, MikroTik. All rights reserved. Mikrotik, RouterOS and RouterBOARD are trademarks of Mikrotikls SIA. Other trademarks and registred trademarks mentioned herein are properties of their respective owners.
NAT Description Network Address Translation is an Internet standard that allows hosts on local area networks to use one set of IP addresses for internal communications and another set of IP addresses for external communications. A LAN that uses NAT is referred as natted network. For NAT to function, there should be a NAT gateway in each natted network. The NAT gateway (NAT router) performs IP address rewriting on the way a packet travel from/to LAN. There are two types of NAT: • source NAT or srcnat. This type of NAT is performed on packets that are originated from a natted network. A NAT router replaces the private source address of an IP packet with a new public IP address as it travels through the router. A reverse operation is applied to the reply packets travelling in the other direction. • destination NAT or dstnat. This type of NAT is performed on packets that are destined to the natted network. It is most comonly used to make hosts on a private network to be acceesible from the Internet. A NAT router performing dstnat replaces the destination IP address of an IP packet as it travel through the router towards a private network. NAT Drawbacks Hosts behind a NAT-enabled router do not have true end-to-end connectivity. Therefore some Internet protocols might not work in scenarios with NAT. Services that require the initiation of TCP connection from outside the private network or stateless protocols such as UDP, can be disrupted. Moreover, some protocols are inherently incompatible with NAT, a bold example is AH protocol from the IPsec suite. RouterOS includes a number of so-called NAT helpers, that enable NAT traversal for various protocols. Redirect and Masquerade Redirect and masquerade are special forms of destination NAT and source NAT, respectively. Redirect is similar to the regular destination NAT in the same way as masquerade is similar to the source NAT - masquerade is a special form of source NAT without need to specify to-addresses - outgoing interface address is used automatically. The same is for redirect - it is a form of destination NAT where to-addresses is not used - incoming interface address is used instead. Note that to-ports is meaningful for redirect rules - this is the port of the service on the router that will handle these requests (e.g. web proxy). When packet is dst-natted (no matter - action=nat or action=redirect), dst address is changed. Information about translation of addresses (including original dst address) is kept in router's internal tables. Transparent web proxy working on router (when web requests get redirected to proxy port on router) can access this information from internal tables and get address of web server from them. If you are dst-natting to some different proxy server, it has no way to find web server's address from IP header (because dst address of IP packet that previously was address of web server has changed to address of proxy server). Starting from HTTP/1.1 there is special header in HTTP request which Page 396 of 615 Copyright 1999-2005, MikroTik. All rights reserved. Mikrotik, RouterOS and RouterBOARD are trademarks of Mikrotikls SIA. Other trademarks and registred trademarks mentioned herein are properties of their respective owners.
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MikroTik RouterOS v2.9 Reference Ma
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General Information ...............
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Bridge Host Monitoring.............
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Frame Relay Configuration Examples.
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Queue Trees........................
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Dynamic DNS Update.................
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Scheduler Configuration............
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Description General Information Sum
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Broadcom Tigon3 Chipset type: Broad
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Chipset type: Marvell Yukon 88E80xx
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Compatibility: • RealTek RTL8129
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Description Atheros Chipset type: A
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Description This is driver for lega
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xDSL Packages required: synchronous
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License Management Document revisio
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Important: the abovementioned limit
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• ERROR: You are not allowed to u
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• NTP - Network Time Protocol ser
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package is installed) • MAC Telne
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Related Documents • Software Pack
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from this type of media; if El Tori
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etype new password: ************ [a
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| from any level [admin@MikroTik] i
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0 D RealTek 8139 1 D Intel EtherExp
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when the addresses were added in th
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y the ISP, you should use the sourc
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Installing RouterOS with CD-Install
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Installing RouterOS with Floppies D
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• IP address/mask - address with
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Configuration Management Document r
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Description The export command prin
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FTP (File Transfer Protocol) Server
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MAC Level Access (Telnet and Winbox
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Flags: X - disabled # INTERFACE 0 a
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Description The Serial Console (man
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Notes [Ctrl]+[Q] and [Ctrl]+[X] hav
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License required: level1 Home menu
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Uninstalling Command name: /system
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10 ppp 2.9.11 11 dhcp 2.9.11 12 hot
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To add a router with IP address 192
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thinrouter-pcipc forces PCI-to-Card
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Description In this submenu you can
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SSH (Secure Shell) Server and Clien
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Example [admin@MikroTik] > /system
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MikroTik RouterOS implements indust
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Common Console Functions Descriptio
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[admin@MikroTik] interface> set 0 m
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Description There are some commands
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owner of safe mode is notified abou
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where: • discovers and shows MNDP
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IP Addresses and ARP Document revis
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ether1 or ether2. Example [admin@Mi
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0 10.0.0.217/24 10.0.0.0 10.0.0.255
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OSPF Document revision 1.4 (Wed Dec
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• if-installed-as-type-1 - send t
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• none - do not use authenticatio
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[admin@MikroTik] routing ospf> inte
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OSPF backup without using a tunnel
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# NETWORK AREA 0 10.3.0.0/24 local_
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[admin@OSPF_peer_2] > ip route prin
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Packages required: routing License
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eceive (v1 | v1-2 | v2; default: v2
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Example To view the list of the rou
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[admin@MikroTik] routing rip> • C
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• dynamic routes - automatically
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Static Equal Cost Multi-Path routin
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General Interface Settings Document
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ARLAN 655 Wireless Client Card Docu
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Example [admin@MikroTik] > interfac
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Interface Bonding Document revision
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determenation relies on the device
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• for Office1through ISP2 [admin@
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Bridge Document revision 2.1 (Fri M
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• Filter Description Ethernet-lik
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To group ether1 and ether2 in the a
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idge1 00:C0:DF:07:5E:E6 ether1 4m46
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• ddp - datagram delivery protoco
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Home menu level: /interface bridge
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action=dst-nat is selected Troubles
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• Device Driver List • IP Addre
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tx-antenna (both | default | left |
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The access point is connected to th
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• One of the units (slave) should
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Cyclades PC300 PCI Adapters Documen
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chdlc-keepalive (time; default: 10s
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[admin@MikroTik] ip route> add gate
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Additional Documents • http://www
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ut it does not affect the NIC's per
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Additional Documents • http://www
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The interface should be enabled acc
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1 1.1.1.2/32 1.1.1.1 1.1.1.1 farsyn
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Finally we need to add IP addresses
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• Moxa C502 Dual Port Synchronous
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0 1.1.1.1/24 1.1.1.0 1.1.1.255 pvc1
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Troubleshooting Description • I c
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[admin@MikroTik] interface ppp-clie
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Hardware usage: Not significant Rel
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mtu (integer; default: 1500) - Maxi
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session-timeout=0s idle-timeout=0s
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• And finally, you have to add sc
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Description With the introduction o
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M3P Document revision 0.3.0 (Wed Ma
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unpacking (none | simple | compress
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• Log Management Description You
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[admin@MikroTik] interface moxa-c10
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[admin@MikroTik] ip route> print Fl
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Flags: X - disabled, I - invalid, D
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• Log Management Description You
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The driver for MOXA C502 card shoul
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The driver for MOXA C502 card shoul
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PPP and Asynchronous Interfaces Doc
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Example [admin@MikroTik] > /port pr
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Example You can add a PPP client us
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RadioLAN 5.8GHz Wireless Interface
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default-destination (ap | as-specif
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1. Setting the Service Set Identifi
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Property Description Notes WDS Inte
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Service Set Identifier test, do the
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acceptance timeout) in microseconds
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• manual-tx-power - channels in c
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Notes It is strongly suggested to l
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• none - do nothing special, do n
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WDS cannot be used on Nstreme-dual
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access point routeros-version (read
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client-tx-limit (integer; default:
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nstreme-support (read-only: yes | n
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Property Description arp (disabled
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Align Home menu level: /interface w
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2412MHz 3.8% 2417MHz 9.8% 2422MHz 2
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Property Description group-key-upda
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Prism card doesn't report that the
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2 2412 -45dBm@1Mbps 00:02:6F:05:68:
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ack-timeout=dynamic tx-power=defaul
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This example will show you how to c
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adio-name: "000C42050022" signal-st
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Flags: X - disabled, R - running 0
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[admin@WEP_StationX] interface wire
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Xpeed SDSL Interface Document revis
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[admin@r1] interface> print Flags:
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• I tried to connect two routers
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2. On router with IP address 10.1.0
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network. Example Our goal is to cre
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IP Security Document revision 3.4 (
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Internet Key Exchange The Internet
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level (acquire | require | use; def
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hash-algorithm (multiple choice: md
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current-bytes (read-only: integer)
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General Information MikroTik Router
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! Create IPsec transform set - tran
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[admin@MikroTik] > /ip ipsec policy
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1. Add an IPIP interface (by defaul
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[admin@MikroTik] interface ipip> pr
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• accessing an Intranet/LAN of a
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[admin@MikroTik] interface l2tp-cli
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[admin@MikroTik] interface l2tp-ser
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To route the local Intranets over t
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On the L2TP server a user must be s
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PPPoE Document revision 1.5 (Fri No
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License required: level1 (limited t
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Example To monitor the pppoe-out1 c
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To disconnect the user ex: [admin@M
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disconnect, they are still shown an
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• For mobile or remote clients to
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Example To set up PPTP client named
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connection mtu (integer) - (cannot
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ound-trip min/avg/max = 3/3.0/3 ms
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VLAN Document revision 1.2 (Mon Sep
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• http://www.cisco.com/warp/publi
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Graphing Document revision 1.0 (09-
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allow-address (IP address | netmask
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HotSpot User AAA Document revision
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name (name) - profile reference nam
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Example To add user ex with passwor
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IP accounting Document revision 2.1
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enabled: yes account-local-traffic:
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PPP User AAA Document revision 2.4
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was no activity present. There is n
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is the caller's number (that may or
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Page 367 and 368: Router User AAA Document revision 2
Page 369 and 370: • password - policy that grants r
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Page 373 and 374: information included • version 9
Page 375 and 376: Bandwidth Control Document revision
Page 377 and 378: disciplines are set under /queue in
Page 379 and 380: picture, Leaf1 will be served only
Page 381 and 382: PFIFO and BFIFO These queuing disci
Page 383 and 384: Interface Default Queues Home menu
Page 385 and 386: Home menu level: /queue tree Descri
Page 387 and 388: upload to the Server and Workstatio
Page 389 and 390: Filter Document revision 2.7 (Fri N
Page 391 and 392: • packet arrival time • and muc
Page 393 and 394: connection-type (ftp | gre | h323 |
Page 395 and 396: ipsec-esp | iso-tp4 | ospf | pup |
Page 397 and 398: add chain=forward src-address=0.0.0
Page 399 and 400: The address list records could be u
Page 401 and 402: Mangle Home menu level: /ip firewal
Page 403 and 404: hotspot (multiple choice: from-clie
Page 405 and 406: coming from the same host to be tre
Page 407: Change MSS It is a well known fact
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Page 413 and 414: out-interface (name) - interface th
Page 415 and 416: Example of Destination NAT If you w
Page 417 and 418: Packet Flow Description MikroTik Ro
Page 419 and 420: Property Description connection-mar
Page 421 and 422: Description ICMP TYPE:CODE values I
Page 423 and 424: DHCP Client and Server Document rev
Page 425 and 426: Flags: X - disabled, I - invalid 0
Page 427 and 428: DHCP Server Setup Home menu level:
Page 429 and 430: DHCP lease in case it is directly r
Page 431 and 432: 6. in other case, the lease becomes
Page 433 and 434: Description To find any rogue DHCP
Page 435 and 436: • 0.0.0.0 - the IP address will b
Page 437 and 438: IP addresses of DHCP-Relay: [admin@
Page 439 and 440: DNS Client and Cache Document revis
Page 441 and 442: secondary-dns: 0.0.0.0 allow-remote
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Page 445 and 446: for that interface: /ip hotspot add
Page 447 and 448: You may wish not to require authori
Page 449 and 450: While client is blocked, FTP and ot
Page 451 and 452: set up in the server profile, and a
Page 453 and 454: split-user-domain (yes | no; defaul
Page 455 and 456: • deny - the authorization is req
Page 457 and 458: • bypassed - perform the translat
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NAT rules From /ip firewall nat pri
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finished session • error.html - e
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• link-login - link to login page
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Notes If you want to use HTTP-CHAP
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• Hotspot will ask RADIUS server
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that they will have login-free acce
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[admin@MikroTik] ip proxy> print en
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path (wildcard) - name of the reque
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esponse may be used to update previ
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Description IP pools simply group I
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SOCKS Proxy Server Document revisio
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Access List Home menu level: /ip so
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client. In this case IP address wou
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IP address on it, and as many inter
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Web Proxy Document revision 1.1 (We
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Note that it may be useful to have
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Description Access list is implemen
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src-address (IP address | netmask)
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This method retrieves whatever info
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Certificate Management Document rev
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decrypt - decrypt and cache public
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DDNS Update Tool Document revision
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GPS Synchronization Document revisi
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[admin@MikroTik] system gps> print
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Description How to Connect PowerTip
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contrast: 0 [admin@MikroTik] system
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MNDP Document revision 1.4 (Fri Mar
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Description This submenu allows you
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MikroTik RouterOS provides both - N
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Home menu level: /system clock Note
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• Health monitoring (RouterBOARD
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• optimal - the BIOS tries to det
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led3 (yes | no; default: no) - whet
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Support Output File Document revisi
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Command Description Notes Example S
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0xCF8-0xCFF [PCI conf1] 0x4000-0x40
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Only users, which are members of gr
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Home menu level: Command name: /sys
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Bandwidth Test Document revision 1.
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[admin@MikroTik] tool bandwidth-ser
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ICMP Bandwidth Test Document revisi
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Packet Sniffer Document revision 1.
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filter-address1 and filter-address2
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• ospf - Open Shortest Path First
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Packet Sniffer Host Home menu level
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Ping Document revision 1 (Mon Jul 1
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and press the [Tab] key: [admin@Mik
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interface (name) - the name of the
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Traceroute Document revision 1.8 (F
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Network Monitor Document revision 1
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done There are two scripts. The scr
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eboot and on most item configuratio
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Scripting Host Document revision 2.
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Console commands are made of the fo
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Variables Description RouterOS scri
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= - greater or equal. Binary operat
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[admin@MikroTik] interface> :put (1
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epeatedly (yes | no) - condition, w
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• omitted - altar LED state forev
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3 4 5 6 7 8 9 [admin@MikroTik] > Sp
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policy (multiple choice: ftp | loca
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Command Description edit (name) - o
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interval (time; default: 0s) - inte
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Traffic Monitor Document revision 1
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IP Telephony Document revision 2.2
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Description IP telephony, known as
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If autodial does not exactly match
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name (name) - name given by the use
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ing-cadence (text) - a 16-symbol ri
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number of packets received by this
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There is a possibility to enter som
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ZZ • If nr=444, it matches the re
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To generate a tone, frequency and c
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• 10 - Call failed as could not f
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0 11 phonejack1 1 _ voip1 [admin@Mi
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Setting up the MikroTik IP Telephon
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# DST-PATTERN VOICE-PORT PREFIX 0 3
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• G.729a codec MUST be disabled (
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We want to be able to use make call
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no-ping-delay (time; default: 5m) -
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Packages required: ups License requ
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Notes The test begins only if the b
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VRRP Document revision 1.4 (Fri Mar
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advertisement packets • none - no
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This example shows how to configure
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