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Multi-WAN Version 1.2.x
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This community-contributed guide leaves out some important information and considerations. The
best source of multi-WAN information is in the pfSense book (http://pfsense.org/book) .

Introduction
This setup enables pfSense to load balance traffic from your LAN to multiple internet connections
(WANs).

Traffic from the LAN is shared out on a round robin basis across the available WANs.

pfSense monitors each WAN connection, using an IP address you provide, and if the monitor fails, a
failover configuration is used, this typically just feeds all traffic down the other connection(s).

This example sets up 2 WANs, but 3 or more can be used by simply extending what this page
describes.

Note that currently most pfSense add-on packages do NOT support multi WAN and all their traffic
will use the WAN connection.

Contents
■ 1 Introduction
■ 2 Overview
■ 3 Before you start
■ 3.1 Target network setup
■ 4 Finishing pfSense console setup
■ 5 Setting up your modems / routers
■ 5.1 Router mode setup
■ 5.2 Bridge mode setup
■ 6 Using the pfSense Wizard
■ 7 Initial setup for Load balancing
■ 7.1 Finishing the interfaces setup
■ 7.1.1 Setting up the OPT 1 interface

http://doc.pfsense.org/index.php/MultiWanVersion1.2 06-Jul-11


■ 7.1.2 Checking interfaces
■ 7.2 Setting up Load Balancing pools
■ 7.2.1 Overview
■ 7.2.2 Selecting a Monitor IP address
■ 7.2.3 Setting up the pools
■ 7.3 Setting up DNS for Load Balancing
■ 7.4 Sticky Connections
■ 7.5 Basic Firewall Rules
■ 7.5.1 First 3 rules
■ 7.5.2 Setting up for protocols that don't like load balancing
■ 8 Further Rules for handling outgoing traffic
■ 8.1 Setting up rules to access specific ISPs

Overview
This guide helps you setup pfSense to support a local network (the
LAN) and 2 connections to the internet (WAN and WAN2). Most
traffic is shared out between the 2 WAN connections, but specific
rules are also setup for some types of traffic to only use 1
connection (for example https), where load balancing can cause
problems.

pfSense runs in a small system that uses 3 network interface cards Networks and computers in a
(NICs), 1 for each of the WANs and 1 for the LAN. multi WAN installation

pfSense can also be run in a virtual machine for testing and
lightweight use, although this is not as secure or robust as a physical machine implementation.

The guide also shows how to setup access from the internet to servers on the internal network, and
has guides to the setup for some specific applications.

Note that if you install servers connected to DMZ1 or DMZ2, these are not protected by pfSense,
and will have to be internet hardened.

Before you start
You must have completed the basic pfSense installation.

Target network setup

This guide assumes the following network setup; you can easily do something different, but you will
need to translate network addresses appropriately if you do.

1. Your ISPs have assigned a single IP address for each internet connection (which could be
dynamic) and you are using your modem / routers in router mode (some guidance on other
variants of this are included in the details below).
2. DMZ 1 is going to use the subnet 192.168.0.0/24
This means that DMZ 1 uses IP addresses between 192.168.0.0 and 192.168.0.254.



3. DMZ 2 is going to use the subnet 192.168.1.0/24
This means that DMZ 2 uses IP addresses between 192.168.1.0 and 192.168.1.254
4. The LAN uses subnet 192.168.10.0/24
This means that the internal network uses IP addresses between 192.168.10.0 and
192.168.10.254

You should pick up the 3 interface cards. Note that if you have DHCP turned off on your WAN1
modem router, there will be a long pause here while pfSense tries to pick up an IP address.

Finishing pfSense console setup
The console will eventually give a prompt pfSense console setup. Select option 2 and setup up the
LAN interface as follows:

LAN IP Address
192.168.10.254
subnet bit count
24 (for a class C space) - this will allow up 250 computers to be used
DHCP
y
DHCP start address
192.168.10.10
DHCP end address
192.168.10.200

You should now be able to plug a PC into the network, and it will be allocated an IP address and you
will be able to access pfSense web interface (although not much else yet).

Setting up your modems / routers
Router mode setup

If you have CABLE/DSL modems that are bridge routers you may
want to use them in router mode. The client ID (PPPoE) is installed
on the modem/router and the modem/router maps the Public IP it
receives to a Private IP on the modem/router LAN interface. How
to do this is specific to each modem/router.

WAN (WAN1) OPT1 (WAN2)
setting Modem / router setup for load
modem / router modem / router
balancing in router mode
LAN IP
192.168.0.254 192.168.1.254
address
Subnet mask 255.255.255.0 255.255.255.0
DHCP on on
DHCP 192.168.0.10 - 192.168.1.10 -
address range 192.168.0.100 192.168.1.100

Once you have set up the modem/routers you can test them by plugging a PC into their network, and
accessing your favourite web site.



Or you can wait until the basic pfSense configuration is in place, and test through pfSense.

Note if you are *cheating* by running multiple subnets on one physical network, you must have
DHCP turned off on all but 1 subnet.

Bridge mode setup

If you have a fixed IP address from your ISP you can also use
bridged mode for some or all of your connections. (If you do not
have a fixed address it makes life complicated in pfSense)

In bridged mode, the modem becomes a transparent (in IP terms)
device, and your internet IP address is allocated to the pfSense
interface. This makes life a bit simpler as it means there is one less
NAT going on. Modem / router setup for load
balancing in bridge and router
You can usually set up at least WAN1 to work in bridge mode (if mode
your modem / router allows it). as this connections allows PPPoE or
bigpond account information to be configured in pfSense.

If you do this, your ISP assigned address will replace the 192.168.x.y address (from the router mode
setup above) in the later sections of the setup.

Using the pfSense Wizard
■ Go to http://192.168.10.254 (or the address you gave pfSense if different)
■ Select System - Setup Wizard from the menu

General parameters screen

■ hostname
■ leave as pfsense
■ domain
■ as you like - I use me.local at home
■ Primary DNS server
■ a DNS address from WAN1 DNS list
■ Secondary DNS server
■ a DNS address from WAN2 DNS list
■ Allow DNS server list to be overridden by DHCP/PPP on WAN
■ Unchecked - if this is checked you won't see the right DNS server list when you set up
load balancing pools
■ Click next

Note: it is important to use one from each (or use a public DNS service) or you will loose internet
access when one or other connections fails.

date, time and time zone screen

■ time server DNS name



■ its a good idea to select a local service - either the one your ISP provides, or a local
pool.ntp.org address (for example uk.pool.ntp.org if you are in the UK, or one in your
time zone).
■ Timezone
■ pick the right entry from the time zone. Note pfSense can provide an NTP service so all
your local machines pick up time from pfSense.
■ click Next

WAN configuration

If have set your WAN modem router to DHCP, you can leave this set to DHCP, otherwise:

■ Selected type
■ Static
■ IP address
■ 192.168.0.1 /24 (or an address in your DMZ1 subnet)
■ Gateway
■ 192.168.0.254 (or the address you gave your fist modem / router

If you are using a plain modem then you can set up your ISP account information here, I can't find a
wiki page about this, but there several threads in the forums that discuss this.

LAN configurationThis was set up through the console so shouldn't need changing

Change your password and reboot

Put in a sensible password, then let pfSense reboot.

After Wizard general setup

These settings make it easier to access machines on your local network - you can access them by
name, and if you are running Windoze you will not suffer at the vagiaries of WINS.

■ Go into 'Services' - 'DNS Forwarder', turn on
■ Register DHCP leases in DNS forwarder
■ Register DHCP static mappings in DNS forwarder

Initial setup for Load balancing
Finishing the interfaces setup

Now it is time to finish setting up the interfaces and make sure they are setup OK.

Setting up the OPT 1 interface

From the pfSense menu select Interfaces - OPT1 and set up as
follows:

enable Optional 1 interface
checked
Type



Static - assumes you are not using an address assigned by
your ISP
MAC address and MTU
do not usually need to be set - see info on screen
Bridge with
None
IP address
192.168.1.1 /24 - or an appropriate address in DMZ 2 if you
used a different subnet
Optional 1 (WAN2) set up for
Gateway a MultiWAN configuration
192.168.1.254 - or whatever address you gave modem /
router 2 (or your ISP has assigned, if no routing being used)

Checking interfaces

From the pfsense menu select Interfaces - Assign and you should
get an screen like the one of the right. Note your hex numbers (The
MAC addresses) will be different.

Now to check that pfSense can see your modem routers you use
Diagnostics - Ping. With WAN 1 selected, enter the IP address of
your modem / router - 192.168.0.254 if you are using the guide
values in this document. Interfaces set up for a
MultiWAN configuration
If you are using using a modem / router without NAT, the check
first that the WAN link is up and ping the DNS server address that
you recorded earlier.

FTP helper: Check also that FTP helper is only enabled for the LAN interface. That is it should be
disabled on all WAN interfaces

Setting up Load Balancing pools

Overview

This setup uses 3 pools

1. One pool for load balanced use when both WANS are
working
2. One pool which prefers WAN 1, for use when WAN 2 has
failed
3. One pool which prefers WAN 2, for use when WAN 1 has
failed
how the various Pools and
These pools use the 2 gateways that are already established (by the gateways are related, and how
they can be used
interfaces WAN and WAN 2) to load balance and support failover
when a WAN link fails

Selecting a Monitor IP address



pfSense monitors each WAN connection by pinging the monitor address you specify. If the ping
fails, the link is marked down and the appropriate failover configuration is used (actually if the ping
fails it retries a few times to be sure, this avoids false indications of the connection going down).

Note that pfSense automatically sets up to route traffic to your monitor IP only down the link it is
monitoring, so don't use a popular web site as this will force all its traffic down 1 link. Better to use a
router or server in your ISP's network.

Good addresses to use your ISP's DNS server (1 from each ISP). The web interface makes it easy to
pick these when setting up the pools later.

Other good monitor addresses are the default gateway your modem has assigned (if it responds to
ping!), your ISP's webmail server, or a router within your ISP's network - you can find one of these
by using traceroute to a public service, be careful though, larger ISPs will have networks that
dynamically adapt so a router you see now may not be there an hour later!

Setting up the pools

We are going to set up 3 pools in Services - Load Balancer

Note that each pool has 2 monitors set up, when complete the 1st
pool should correspond to the screenshot on the right.

Setup for the first (load
balancing) pool

Setting Pool 1 Pool 2 Pool 3
Pool name LoadBalance WAN1FailsToWAN2 WAN2FailsToWAN1
Round Robin load WAN 2 preferred when WAN 1 preferred when
Description
balancing WAN 1 fails WAN 2 fails
Type Gateway Gateway Gateway
Behavior Load Balancing Failover Failover
Port Unused Unused Unused
1st Monitor IP DNS server 1 DNS server 2 DNS server 1
1st Interface
WAN WAN2 WAN
name
2nd Monitor
DNS server 2 DNS server 1 DNS server 2
IP
2nd Interface
WAN 2 WAN WAN2
name

This finals screenshot shows the summary you should end up with.



Setting up DNS for Load Balancing 3 pools set up ready for load
balancing
Make sure that you have a DNS server from each ISP in the
General Settings. This will ensure that you have DNS service in
case one ISP goes down. You will also need to setup Static Routes for each DNS server. In this
example if the DNS is on the WAN link then the static route for that DNS server will have
192.168.0.254 as the gateway. If the DNS server is on the other ISP (ie OPT1) then the static route
will have have 192.168.1.254 as the gateway.

Sticky Connections

pfSense Version 1.2 introduced Sticky connections, which can be used as part of a MultiWan setup.
Where Sticky connections are used, some of the firewall rules previously used are no longer
required; this is noted in the information below. 'Sticky connections' are a very good where there
are many active systems / users, or where your WAN connections are fast, they are not so useful for
small number of users on slower connections (as the multiple requests involved in fetching a single
web page will not be shared across the available connections.

Basic Firewall Rules

These are the rules you need to add to support access from your LAN to the internet. Later sections
describe the rules you need to support incoming access from the internet to machines on your LAN,
this includes how to support peer to peer applications.

First 3 rules

If you do not need to access any of your systems from the internet, and you use sticky connections,
then these are probably the only rules you will need.

Set these rules up in Firewall - Rules, and then click the LAN tab.

Rule Load Balance DMZ 1 DMZ 2
Position in
Last Top Top(-1)
rule list
Action Pass Pass Pass
Disabled Unchecked Unchecked Unchecked
Interface LAN LAN LAN
Protocol any any any
Source LAN subnet LAN subnet LAN subnet
Source OS any any any
network:
Destination any WAN2 subnet
192.168.0.0 / 24
Log no yes temporarily (see below) yes temporarily (see below)
Schedule none none none
Gateway LoadBalance default default
Everything else gets Make sure DMZ 1 traffic Make sure DMZ 2 traffic
Description
shared out goes to right interface goes to WAN2 DMZ



Rule logging

It is always a good idea to put a new rule in with logging turned on, then check by generating some
appropriate traffic, that the rule is working, then turn logging off once you know it is having the right
effect.

Rule explanation - Load Balance

This rule must always be the last rule in the rule list. It catches anything else that is not special in any
way, and load balances the traffic. Any rule that comes after this rule will never trigger, so may as
well not be there!

Rule explanation - DMZ 1 and DMZ 2

These rules make sure that any traffic to the modem / router, (or other machines that are connected to
this subnet if you are not using bridge mode), go down the right WAN connection. Without these
rules you will find strange things happening when you try to access your modem / router.

These rules should always be top of the rule list as you do not want earlier rules to route this traffic
elsewhere.

Testing these rules

Testing the DMZ rules
Use a web browser to access the administration interface on your modem / router. Then use
Status - System Logs, Firewall tab to check if the rule has fired.
Testing the load balancing rule
Access any site on the internet, then check the firewall log (as above) to see if the rule fired.

Don't forget to turn off logging on the rules once you have checked them.

Testing failover

Now you should make sure that failover is working.

■ Switch off (or unplug) one modem / router
■ Check the pfSense Load balancer status screen ('Status' - 'Load Balancer')
it should show (within a few seconds) that one link has failed.
■ if it shows that both links have failed, it probably means you have your monitor IP's the
wrong way round. Use a trace route from PC on the LAN to trace the route to each
monitor IP address and if it is using the wrong WAN link, re-setup the WAN links the
right way round.
■ Now try accessing a internet site, it should appear without any problems.
If it fails, then check the load balancer status (see above). If one link is still marked up, check
that it is not a DNS failure

Setting up for protocols that don't like load balancing

Some sites (for example banking sites) get upset when requests from a single session come from
different IP addresses. To avoid this, protocols that are likely to suffer from load balancing are setup
to favour 1 connection.



Note that use of the sticky bit (see above) should avoid this issue. If you are not using sticky bit, you
definitely need this.

For each protocol that needs to be handled this way you need a rule on the LAN interface; the
sample below is for https (port 443). The values marked in bold are the ones that change for
different protocols.

These rules need to be above the final load balancing rule, and below the rules for DMZ access.

Parameter Value
Action Pass
Disabled unchecked
Interface LAN
Protocol TCP
Source: not unchecked
Source: type LAN subnet
Source OS Any
Destination: not unchecked
Destination: type any
Destination port range HTTPS
Log checked initially; uncheck when known to be working
Gateway WAN1FailsToWAN2 - or WAN2FailsToWAN1 as you prefer
Description Route https through one working connection

Other entries you are likely to need are SSH and POP3. For these just replace HTTPS in bold above
with the protocol you requre, and amend the description.

Further Rules for handling outgoing traffic
Depending on usage there are likely to be other rules you will need for outgoing traffic.

Setting up rules to access specific ISPs

If you send traffic to hosts on a specific ISP (such as SMTP email) you may have to make sure that
traffic goes to the right ISPs WAN connection. ISPs block mail being sent if it does not come from
one of their customer's lines, so if you try to send mail through the wrong connection it will be
rejected. If your WAN connections are from different ISPs and you send mail using SMTP you will
need to do this. If you only use webmail (your email interface is a web browser, such as hotmail),
you do not need this.

The simplest way to handle this is to route all SMTP traffic to one ISP - of course if you send SMTP
mail through both ISPs you will need to handle this a different way.

For this type of use, the rule is setup to use only 1 WAN connection. This means that if the
connection goes down, the traffic cannot pass, but as it would fail if it picked up the other connection
this is the right behaviour.

The example below is for SMTP, change the bold parameters for other traffic



These rules should go in above both DMZ and preferred traffic rules

Parameter Value
Action Pass
Disabled unchecked
Interface LAN
Protocol TCP usually
Source: not unchecked
Source: type LAN subnet
Source OS Any
Destination: not unchecked
Destination: type any
Destination port
SMTP
range
Log checked initially; uncheck when known to be working
192.168.0.254 or 192.168.1.254 or the appropriate gateway address for this
Gateway
traffic
Description Route SMTP to the ISP that handles it
This article is part of the HOWTO series.
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