Nat Failover With Dual Isp

Configuring Redundancy

NAT failover with DUAL ISP on a router with Policy Based Routing. Posted on October 10, 2013 by saurabh. INTRODUCTION:-WAN Failover and Load Balancing allows you to. Configure NAT overload (PAT) to use route-maps! Ip nat inside source route-map fixed-nat interface Dialer0 overload ip nat inside source route-map dhcp-nat interface FastEthernet0 overload!! Configure an OER tracking entry! To monitor the first ISP connection! Ip sla 1 icmp-echo 172.16.108.1 source-interface Dialer0 timeout 1000 threshold.

Primary ISP configuration:

1. Create a PBF rule that forwards traffic to the default gateway.
2. Attach a tunnel monitoring profile and set the action as 'disable on failure.'

Monitoring Profile:
This configuration forces all traffic coming from the 192.168.1.0/24 subnet to egress out of Ethernet 1/3.
A Monitor Profile is set up to monitor an IP address. In the test config, monitor profile 'multiple isp' is used to monitor a public DNS 8.8.8.8.
When the monitor can no longer reach this IP address, the defined action (fail-over), takes place. The PBF rule is disabled and the firewall falls back to the static route created in the virtual router, as shown below. Path monitoring verifies connectivity to an IP address so the firewall can direct traffic through an alternate route. The firewall uses ICMP pings as heartbeats to verify that the specified IP address is reachable.
A monitoring profile allows specifying the threshold number of heartbeats to determine whether the IP address is reachable. When the monitored IP address is unreachable, the user can either disable the PBF rule or specify a fail-over or wait-recover action. Disabling the PBF rule allows the virtual router to take over the routing decisions.
Secondary ISP configuration

• Create a static route with a normal metric

Configuring Load Sharing
Example 1: Load balancing with no backup
In this case, PBF is used to force traffic from different subnets through the respective ISP. In this scenario, all traffic from subnet 192.168.1.0/24 is forwarded out of Ethernet 1/3, and subnet 172.16.1.0/24 is forced out of Ethernet 1/4.
Rules:

• Rule 1: Subnet 192.168.1.0/24 going to 0.0.0.0/0 next hop is ISP 1
• Rule 2: Subnet 172.16.1.0/24 going to 0.0.0.0/0 next hop is ISP 2

Example 2: Load balancing and redundancy
In this case, PBF is used to forward traffic out of a particular interface based on the source
A backup is configured if the ISP goes down.
Rules:

• Rule 1: Subnet 192.168.0.0/24 going to 0.0.0.0/0 next hop is ISP 1
• Rule 2: Subnet 172.16.0.0/24 going to 0.0.0.0/0 next hop is ISP 2
• Backup for Rule 1: Subnet 192.168.0.0/24 going to 0.0.0.0/0 next hop is ISP 2
• Backup for Rule 2: Subnet 172.16.0.0/24 going to 0.0.0.0/0 next hop is ISP 1

Rule 1 and Rule 2 perform the same action as Example 1.
The backup rules allow traffic to go through the ISP that has connectivity in case either were to fail.
If VPNs are configured (IPSec or GlobalProtect), refer to the following documents for information on how to configure the VPNs:

ISP Redundancy with SonicWall

If you have used the internet then you know that there will be disruptions and that many of those disruptions are caused by your ISP.

The best part is that you can minimize ISP caused internet disruptions by having multiple ISPs and configuring your router/firewall to failover properly when one link has a failure. The SonicWall firewalls have built in support to manage multiple ISPs with failover. While this article was created using a SonicWall TZ 215 running SonicOS Enhanced 5.8.1.13-1o, the steps are pretty much the exact same using other SonicWall models and SonicOS versions, such as my NSA 3500 running SonicOS Enhanced 5.9.0.3-117o. Everything is pretty much the same. Differences will be seen in the number of interfaces. This article will explain configuring multiple ISPs/WANs on SonicWall firewalls.

Inbound vs Outbound Link Balancing

The important thing to understand is the difference between inbound and outbound ISP redundancy. If you have servers on the inside of your network that need to be accessed from outside, you will want to have inbound redundancy. You may wish to read a previous article on Link Balancers that explains how this can be done. However, if what you need is just outbound link balancing, then your SonicWall should be able to do exactly what you need. Even better, this article will show you how!

Configure Your SonicWall for Multiple ISPs/WANs

Step 1 – Physical Connection

Your SonicWall will typically have multiple interfaces that can be used for ISP connections. In the image above the typical LAN(X0) and WAN(X1) interfaces are likely already being used for your first ISP/WAN and your LAN. For this example, I used interface X2 for my second ISP. If it is available, then plug your second ISP's uplink cable there.

Step 2 – Configure Your X2 Network Interface

Configure the SonicWall X2 Network Interface

Next, we need to login to the SonicWall Firewall with your web browser. Navigate to Network / Interfaces. Find X2 in the list and click on the pencil edit button for X2.

First, you will want to set the Zone for this interface to 'WAN'.

Next, you will type in the static or DHCP IP Addressing information that your ISP gave you.

Cisco Nat Failover Dual Isp

If you want to be able to manage your SonicWall using this address and interface, then allow that by checking the protocols on the Management Line.

Click Ok, when done.

Step 3 – Browse to Network / Failover & LB

Winrar password torrent. Enable load balancing by checking the 'Enable Load Balancing' check box, then under 'Groups', find the 'Default LB Group' and click the Configure / Pencil button for the Default LB Group.

At this point, you will need to choose a 'Type' for this Load Balancer. There are 4 types to choose from:

* Basic Failover – Probes the internet on both interfaces, but all traffic goes through your primary. If the primary goes down, traffic goes through secondary.
* Round Robin – Traffic goes equally over both ISP interfaces. If one goes down, all traffic goes through the one that is still up.
* Spill-over – All traffic up to a specified MBPS rating goes through the primary ISP interface, traffic over the threshold goes through the secondary ISP interface.
* Ratio – When both ISP interfaces are up, traffic goes through each using a specified ratio that we configure adding up to 100% (70-30,60-40,etc…).

Make your 'Type' choice. I chose 'round robin' which makes the options you see above. Webcammax serial key finder. I then chose the X2 interface and added it to the Selected Interface Pool on the right using the 'Add >>' button. Your options will be slightly different depending on the 'type' choice you chose above. For Spill-over, you will choose how much bandwidth to use on the primary before spilling traffic over to the secondary interface. If you chose ratio, you will decide what percentage of the total traffic to send over each interface.

Configure SonicWall Failover and Load Balancing Probing

Configure Probing

Probing is what is used to detect if an ISP is up and operational or not. We tell it how frequently to check the interface, how many failures it takes to deactivate the interface, and how many successful checks to make before reactivating the interface again.

We also can check the 'Probe responder.global.sonicwall.com on all interfaces in this group' to have it probe the SonicWall system through each interface for the probe. Set these the way you want and then…

Click Ok. This will bring you back to the Failover and LB page.

Nat Failover With Dual Isp Dhcp

You should see something similar to what is shown in the image above with both interfaces in the group and statistics displaying. Be sure to click the 'Accept' button.

Your SonicWall should now be configured for Failover and Load Balancing.

Nat Failover With Dual Isp Ip

Nat Failover With Dual Isp Router

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Nat Failover With Dual Isp Connection