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Setting up Internet Access Server on Basis of MikroTik RouterOS
and ISP Billing System NetUP UTM5
This article is concerned with setting up an Internet access server on basis of MikroTik
RouterOS. Access server that blocks/unblocks Internet access is also capable to limit the
bandwidth. Internet access is controlled by the firewall by adding/removing rules to the
forward chain. Bandwidth is limited by Simple Queues. For managing an access server
using billing system UTM5 it is used utm5_rfw daemon, which calls auxiliary scripts that
automate connections to the access server via ssh or telnet and run commands at the
server for operating the firewall or simple queues.
Hereinafter we suppose that the access server connects to the local network via the Internet (its IP address in the local network is, and
subnet mask is or 24 in CIDR notation). An external IP address of the
access server is (mask By default the gateway IP is The billing system UTM5 is installed on the server, the IP address is In order to allow users of the network connecting to the Internet
IP addresses are transmitted to the external IP address of the access server (SNAT). As in
the current configuration the access server also acts as a router, we shall use these two
terms as synonyms.
Configuring the access server
Setting up Mikrotik RouterOS is not at all that complicated and is mentioned at the
following web site H http://www. TU mikro UT H
Here we shall review the process of installation from a CD.
Download the CD image from the web site H www. TU mikro UT H and burn a CD. Place it
in your CD-ROM drive and boot up the computer. Now you need to select necessary
packages. For an Internet access server it’s enough to select system and security .
Press ‘i’ and follow the configurator.
Security package is necessary only to access the router via ssh. If you prefer telnet you
need not to install the security package. If you forget to set it up you may find out how to
install it below in this article.
After installing the Mikrotik OS you should configure the computer in order to make an
access server: set an administrator password, set IP addresses for networking interfaces,
set a default gateway, set DNS addresses, enable SNAT and set default firewall rules.
If you wish your computer to work for more than 24 hours you should register your OS
version. For registration go to H http://www. TU mikro UT H
After installing Mikrotik OS a user ‘admin’ is created without a password by default. For
setting the password use the command /password .
Setting IP addresses and default gateway
In Mikrotik OS networking interfaces can be configured using one of two methods:
1. Command /setup and follow the instructions on the screen
2. Menu command /ip .
Let’s examine the second method.
In order to set the IP addresses for the interfaces run the following commands:
> /ip address add address= interface=ether1 comment="INTERNET"
> /ip address add address= interface=ether2 comment="LAN"
The following command allows to check IP address settings:
> /ip address print
Flags: X - disabled, I - invalid, D - dynamic
0 ;;; INTERNET ether1
1 ;;; LAN ether2
Now set the default gateway:
> /ip route add gateway=
For viewing the routing information (especially default gateway) use the command
> /ip route print
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip,
b - bgp, o - ospf
0 ADC ether1
1 ADC ether2
2 A S r ether1
For finishing setting up the network define DNS addresses:
> /ip dns set primary-dns=
> /ip dns set secondary-dns=
To check the defined DNS use the command:
> /ip dns print
allow-remote-requests: no
cache-size: 2048KiB
cache-max-ttl: 1w
cache-used: 16KiB
Check if the settings are correct by the command /ping
SNAT and firewall
In order to allow the users using the Internet their local IP addresses at the external
interface of the router should be translated to the external IP address:
> /ip firewall nat add chain=srcnat src-address= \
\... out-interface=ether1 action=src-nat to-addresses=
In order to check the settings of IP address translation, use the following command:
> ip firewall nat print
Flags: X - disabled, I - invalid, D - dynamic
0 chain=srcnat out-interface=ether1 src-address=
action=src-nat to-addresses= to-ports=0-65535
After setting up translation of IP addresses every computer of the local network is
allowed to access the Internet. To manage access of users add the following rules to the
forward chain of the firewall:
> /ip firewall filter add chain=forward action=jump jump-target=utm5_forward
> /ip firewall filter add chain=forward action=drop
The first rule redirects packages from the forward chain to chain utm5_forward. In this
article we add to this chain only the rules that permit Internet access. The second rule
rejects all packets which are explicitly not allowed to pass. After the second rule has been
added Internet access from the local network shall be denied.
Now we have finished configuring the router. The access server is managed by the
utm5_rfw daemon using scripts from the package utm5_mikrotic according to the
commands of the billing system core utm5_core.
Setting up ssh server
Note : If you already have the security package installed skip this section.
SSH server is located in the security package. In order to view all installed packages run
/system package print . If security package is absent from the list of installed packages it
should be installed.
Before installation it is necessary to check the free space /system resource print . To install
the package just download from the web site H www. TU mikro UT H the following file: , unpack it and load security-2.9.xx.npk to the router via ftp
protocol in the binary mode. Then reboot the access server /system reboot - the package
will be installed while the server is preparing for restart. You can watch the installation
process from the monitor connected to the access server. After rebooting, the installed
packages are reflected in the list /system packages print . Please, draw attention that the
security package must not be disabled.
> /system package print
Flags: X - disabled
0 security 2.9.13
1 system 2.9.13
Also make sure that ssh service is not disabled. For this use the command /ip service
print .
Also check the ability of connection to the access server using the SSH client.
Configuring utm5_rfw daemon
Hereinafter it is supposed that you have already configured traffic classes, services and
tariffs. Also it is proposed that the system user rfw has been already created (under this
name utm5_rfw connects to the system core). If you have not yet performed this, use the
UTM5 user’s guide.
In this article utm5_rfw daemon is configured under Gentoo Linux OS . In any other OS
configuring can be accomplished in a similar way.
utm5_rfw daemon may be set up at any server which is able to connect to utm5_core via
tcp protocol. Here it is supposed that utm5_rfw and utm5_core are located at the same
physical server.
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