Juniper dual isp nat

Juniper dual isp nat

IPv6 traffic was directed to a Juniper M10i acting as “translator-in-the-cloud” Juniper experienced a global DNS outage around 6am EDT. Using 2 internet links with Juniper screenos Firewalls to separate traffic (pbr) and apply traffic shaping Published October 19, 2008 | By Corelan Team (corelanc0d3r) Scenario : you have 1 Juniper firewall, which has 2 internet connections : an expensive but reliable 4Mbit connection, and a fast, less expensive, but less reliable 20Mbit connection. 3/8. The problem is, most people (me included) are introduced to “routers” by way of setting up some kind of NAT gateway at home. The Ziggo phone services includes free (and ultra lite) Internet access through the use of their cable modem. Juniper SRX devices don't have a separate command to see NAT translations. This document describes how to implement the Network Address Translation (NAT) configuration required in the Cisco Adaptive Security Appliance (ASA) for the Expressway-E Dual Network Interfaces implementation. As ISP B does not own 128. I am unsure of/stuck on 2 things. The basic features including: pfSense Home Topology Static/default/dynamic routing Stateful firewall Network Address Translation (NAT) Virtual Private Networks (VPN) Dynamic Host Configuration Protocol (DHCP) Domain Name System (DNS) Load balancing and so on. We need to configure the routing table under [routing-options] hierarchy. im a newbie at networks, i am trying to configure a juniper srx to work with 2 diffrent isp. Dual ISPs with a netscreen SSG-20 I’ve been using Netscreen boxes for years now, but I feel like I’ve never had a good comfortable understanding of them until recently. 102. Re: Dual ISP load balancing and VRF-Lite Thu Nov 01, 2012 1:43 am pbr is prolly not the best way depending on how it is setup its difficult to do a failover scenario when you have the next hop assigned statically. cluster needs the IP of its 'next-hop', (usually the router supplied by your ISP). When dealing with VoIP traffic on today’s networks it is inevitable that you will run across an issue involving NAT and SIP. You may also want to check out the Barracuda Link Balancer which claims to offer cost-effective Internet Performance and Availability by dynamically balancing traffic across multiple ISP links. 1. 66. Apr 22, 2018 Making Use of Multiple Public IP addresses - Static NAT - Juniper SRX was that try as I might I couldn't get the ISP supplied router to do this. e. Today, with IPv4 it is not uncommon for a typical branch office to have two ISP connections, each with unique IPv4 ISP address space (provider assigned). This article describes the most common GRE tunnel deployments. Prerequisites Requirements Once you nail your first configuration it seems to get a bit manageable. . 168. to specify “nat src” in your policies between LAN and Public (or WAN  Aug 30, 2014 Juniper SRX240 - Firewall Cluster (Active / Standby) you then know about security zones, how to add default routes, and setup NAT etc. t he ip monitoring with route failover feature is available from 11. You have 2 Dynamic PAT configurations, one for each ISP. Configure a Source NAT The instructions show how NAT and multilink policy are implemented to balance the load. We now need to configure the 'ip nat inside' interface, global nat overload command and associated access list. Here is my situation I have dual ISP configured on my ASA 5505. There are four types of NAT as follows: Full Cone NAT (Static NAT) A full cone NAT (also known as a one to one NAT) is the only type of NAT where the port is permanently open and allows inbound connections from any external host. The advantage is that the end-user will have to do nothing and it will always route non-media content to ISP A and media content via ISP B, and you can use both ISP's simultaneously on all PC's I tested a vpn using your ‘Configuring site-to-site IPSEC VPN on ASA using IKEv2’ using 2 x back to back ASA firewalls, which was successful. Normally all of our traffic should flow through the high speed primary ISP. This was not related to the world IPv6 day activities. Site-to-Site VPN with dual ISP for backup/redundancy Understanding NAT and NAT Rule Order (ASA 8. All in all took about 2 and half hours to fix. For that reason, it's a pretty important protocol, and it can also be the hardest one to understand. 4) Using curl for troubleshooting Check Point R75 Terminology and Architecture Using packet-tracer for validating ICMP traffic You have two connections to the internet. Unplug one and it works, but that kind of defeats the purpose of having a dual WAN router. 0/24 to the IP address of the egress interface on the firewall (10. The following example demonstrates how to configure a redundant Internet setup with basic failover. So, let’s get started. Juniper SSG5 關於双路負載平衡Dual Wan Load Balance; Juniper SSG5 關於Dual Wan Failover双Wan(ISP)備援; Juniper SSG5 關於VROUTER(Virtual router)之間的路由; 關於Netscreen Remote VPN Client; Juniper SSG5 常用監控維護命令; Juniper SSG5 SNMP管理設定; Juniper SSG5 透明模式; Juniper SSG5 PPPoE Internet設定 Site-to-Site VPN with dual ISP for backup/redundancy GRE over IPsec - Configuration and Explanation (CCIE Notes) Understanding NAT and NAT Rule Order (ASA 8. For this test to be successful, you must have SOURCE NAT configured and security policies should allow the traffic. Combine that with a Juniper SRX firewall, and a dual ISP setup is born. 11ac, with up to 750Mbps across all devices. juniper. 88. Multiple ISP IP Pool within Zone I migrated a user over from a Sonicwall, and for sake of uniformity with other fortigates and policy management, I created Zones for the WAN interfaces. I am running traceroute from each hosts and traffic follows different ISP for each host. Each ISP has a router connected to it. In this post we’ll look at one way to accomplish this goal with a few technical requirements. [edit routing-options] I am envisioning 3 routing instances, 1 per ISP and 1 for the "corporate" network. At first, we will configure pool for Mail Server under edit security nat destination hierarchy. 4. 1 24. 0/16, there is no way for the to aggregate /24 prefix, so they will re-advertise your 128. Example: Web Server Private IP: 192. 100. i want to have redundancy is one fails, and also to do some load balancing for the network. Load Balancing over ststic routes on JunOS [Juniper SRX, MX] Juniper SRX GNS3 Source NAT, Mikrotik Configure Dual ISP Redundancy Failover by GUI - Duration: This article contains a sample configuration for J-Series and SRX Branch with dual ISP connection. g. When I create the policy, I can choose multiple IP pools, but it appears to use them top down with no association to the . e. There are 2 SMTP relay servers that go outbound (outbound only) using IP Pools. Static NAT must be performed between Interface IP address (4. Site B: A single SRX w/IDP running. 4) Assigning a Secondary IP address to an Interface in JunOS CCIE Security Debug F5 monitor response from the server Troubleshooting SSL handshake in F5 BIG-IP LTM - Part 1 (SSL/TLS Protocol Mismatch) Juniper Networks Junos® automation and scripting capabilities and Junos Space Security Director reduce operational complexity and simplify the provisioning of new sites. 5. It is also running an SMTP server that is accessible on both the primary and secondary ISP's. Atleast this is how it seems to me. Below shows the required configuration for PPPoE. Juniper SRX - Dual ISP + NAT/routing issue (self. Configure static NAT for inbound connections # ip nat inside source static tcp 10. You want to advertise your network of 192. 101. Local time 5:27 PM aest 2 July 2019 Membership 842,960 registered members 11,908 visited in past 24 hrs 1,054 members online now 1,494 guests visiting now Network devices can operate in 3 different modes: OpenWrt as Client Device - Connecting the device to an existing network If you want to connect your device to an existing network to provide additional functions (for example, you just want to use the Wi-Fi network it provides, the additional ethernet ports, or the device is a NAS serving files over the network, or a mini-server offering some Jan 28, 2018 Solved: Dear All, Please help me to solve destination nat configuration erros. Hi, I was wondering if anyone here have implemented destination nat with multiple ISP's on a SRX with a default route for traffic from internal to outbound pointing to only 1 ISP? What is ISP – Internet Service Provider Which all SRX platforms support dual control ports? What is VR wrt SRX firewall? What are NAT types in Juniper SRX? Juniper Networking Technologies Imagine you had your own personal JTAC engineer for a day so you could learn how to configure the MX Series to truly fit your operational NATing needs. 1 and be translated to 1. Wed Dec 12, 2012 11:51 pm 32's or other types of host routes nat that on the firewall for specific Introduction. As you most likely already know, Juniper screenOS supports a couple of dynamic routing protocols (OSPF, BGP, RIP). While NAT is covered in a different article, we will simply list the necessary commands to configure NAT so that the internal network has access to the Internet. 2), such that all the all internet requests for Server Y MUST be received on 4. Still having a issue when both ISP are connected, cannot access webmail. They are looking for solutions to have the LAN connected to Internet, VoIP traffic with an acceptable QoS level, most of them have to handle VPN tunnels and DMZ too! This document explains how to configure a Palo Alto Networks firewall that has a dual ISP connection in combination with VPN tunnels. I need to NAT serveral servers on the inside to public IPs on the outside. The original firewall/NAT'ing device won't need any additional Note: The WAN port to be configured in Drop-in Mode will be Peplink and Juniper SRX · Deployment scenario in existing Firewall and Peplink Balance Drop in mode with multiple ISP and Publish servers in different WAN connection . This topic has been deleted. This article shows a configuration example of FBF in a typical dual-ISP scenario. One picture worths thousand words so let's have a look at what I am trying to say. Furthermore, I am translating all my static public IPv4 addresses to private ones through static NAT entries. 12/06/2018; 4 minutes to read; In this article. i  Hoping for a little direction/advice from someone that has setup something similar . One of the most powerful VPN routers on the market comes from UTT. GRE Deployment Scenarios Zscaler recommends that organizations use a combination of GRE tunneling, PAC files , Surrogate IP , and Zscaler App to forward traffic to the Zscaler service. 0/24 or any part of 128. 2, AND Server Y must use 4. At the moment I have 2 juniper SRX240s, one connected a 100Mb fiber, and the other connected to 10 Mb EFM. It has IP-Monitoring so if the primary or backup ISP goes down, traffic is rerouted automatically. 40 Public IP from ISP 2: Dual WAN Router with Dual ISP Using BGP and OSPF There are a small variety of methods to implement failover of your WAN perimeter between two ISPs. The SRX300 line of devices recognizes more than 3,500 Layer 3-7 applications, including Web 2. 42. You can however force certain type of traffic, destination based to be "routed" over the secondary ISP. i'm a newbie at networks, i am trying to configure a juniper srx to work with 2 diffrent isp. Juniper SRX allows for this type of fwpolicy. One connection through ISP 1, one connection through ISP 2. One picture  Aug 31, 2013 This is accomplished by using preference and qualified-next hop feature available in JunOS operating system. PCNSE  Mar 18, 2012 But when it comes to Juniper, you better not assume things right away It makes two separate entries for the different IPs instead of Site-to-Site VPN with dual ISP for backup/redundancyIn "Cisco" Dealing with NAT →  Jul 5, 2018 What is so special about NAT (Network Address Translation) that makes network design where a customer is connected to two different ISPs. networking) For the time being my aim is to be able to retain ISP failover, use the AT&T interface as a default For routing different kinds of traffic out of different interfaces, on Junos there is a feature called Filter Based Forwarding (FBF). One interface ip nat pool NAT-pool 24. A full cone NAT BGP Load Sharing on Dual Routers with Two ISPs plus a default route from each ISP provider for our outbound traffic and prefer specific routes for each edge BGP router for our inbound traffic Often, surfing on networking forums and blogs, I find posts by people asking how to setup dual WAN connection and load-balancing on a single box. Juniper IT also deployed native IPv6 on the Sunnyvale campus, on seclect wireline jacks and on the secure wireless network. Cisco IOS – NAT failover with 2 ISP. Feb 21, 2019 i am trying to configure a juniper srx to work with 2 diffrent isp. So, two ISP @ home. Off late there has been a lot of migration from the traditional Cisco oriented networks to Juniper and Alcatel Lucent. Configuring NAT Using the NAT Wizard, Example: Configuring NAT for Multiple ISPs , Configuring Proxy ARP for NAT (CLI Procedure), Configuring NAT trace options, Monitoring NAT Incoming Table Information, Monitoring Interface NAT Port Information We are also wanting to perform failover with ip-monitoring but didn't see any option for next-table; only next-hop. for the purpose of a redundency, incase the primary ISP goes down the backup kicks in. We have two ISPs, ISP A and ISP B. Whether it’s using inline NAT or a MS-DPC Card, it’s all here for you to test in your lab. This page provides NAT configuration samples for Cisco ASA and Juniper SRX series routers when working with ExpressRoute. Hello, Configure Destination NAT in Juniper SRX. 0/0 set security nat  Aug 16, 2013 The last couple of years, we've had two ISP's on premise. 0. Dual ISP on the ASA means you have two default routes configured, one primary with tracking/SLA enabled for reliable availability and one backup which takes over when SLA goes down. NAT failover with DUAL ISP on a router Configuration Example (Cisco Wiki) Juniper - Deploying IP Telephony with EX2200 You will need to get an approval from ISP A for this, and you will need to present this approval to ISP B. 3cx Alcatel-Lucent APC Apple Arduino Arista Aruba BlueCoat Brocade Cabling CheckPoint Cisco Citrix Cyberoam Dell DLink Docker EMC F5 Fanvil Force10 FortiNet FreePBX GNS3 Hack HP Juniper Linux Microsoft Mikrotik NetApp PaloAlto Personal Proxmox QLogic Ruckus Sangfor SNMP Solaris SonicWall Sophos SQL TPLink Ubiquiti Unetlab VirtualBox VMWare Networking Forum powered Dual router (HSRP) for dual ISP. Even if you only have 1 IP you still make a pool. Jan 22, 2017 This article provides Juniper Configuration Example that uses BGP requiring you to do NAT on border device, or might give you a large block allowing Your ISP might have the capability to join two physical devices into a  http://www. when Primary ISP goes down then Secondary takes over with correct NAT with the use of the secondary ISP's public IP address. Only users with topic management privileges can see it. It was an excellent tutorial, well laid out and easy to understand. 1 for all outbound communication. Juniper Networks introduced the JProtect security toolkit in May 2003. 40. You can connect two interfaces of the firewall to two different ISPs and use the new “SLA Monitor” feature (SLA=Service Level Monitoring) to monitor the link to the primary ISP, and if that The IP pool settings information is important, because it is the pool of IP addresses that the firewall assigns to connecting GP clients. The requirement at the customers site was to forward all http and https connections through a cheap but fast DSL Internet connection while the business relevant applications (mail, VoIP, ftp, …) should rely on the reliable ISP connection with static IPv4 addresses. 關於Juniper SRX JUNOS NAT Juniper SSG5 關於Dual Wan Failover双Wan(ISP)備援; Juniper SSG5 關於VROUTER(Virtual router)之間的路由 Juniper SRX300 Dual Wan Failover Config As I had tough time finding any helpful working config online and by gathering data from many sources i managed to get it all working , so this might help someone in need. 0/24 to both ISPs. Configure Dual ISP Link Failover in Juniper SRX. While load balancing can be used for various applications, its commonly used for load balancing between two ISPs and this is the subject we’ll be covering today. When it does the actual the NAT translation however, it always uses the 4 values mentioned above. Introduction. - Jouni Tech support was very helpful and had to reload new software. The NAT Process The Border Gateway Protocol (BGP) is the routing protocol of the Internet, used to route traffic across the Internet. Router configuration samples to set up and manage NAT. outside1 and outside2However, on ASA 5506-x every time when I configure NAT statement for the outside I am using a Cisco router for my basic ISP connection with a NAT/PAT configuration that translates all client connections to the IPv4 address of the outside interface of the router. Many broadband ISP such as DSL and Cable Internet are providing such services under Business Class with affordable price, though a "real" business-grade Internet connection such as Ethernet, fiber This is article that explains how to configure dual ISPs on a Cisco ASA 5505 firewall for redundancy purpose. 2) I kept both routes to each ISP in the main routing table but made one a backup with an administrative distance of 10. Juniper SRX Dual WAN with NHTB Full Mesh VPN and OSPF El siguiente post se trata de una maqueta con Firewalls Juniper SRX cada uno con 2 enlaces WAN simulando ISP's diferentes donde configuraremos 2 VPN NHTB Full Mesh, una VPN por cada enlace WAN a fin de obtener Alta Disponibilidad y enrutamiento dinámico OSPF por dentro de los enlaces túneles. 2(1) and upwards, the Cisco ASA 5500 series firewall supports now the Dual-ISP capability. These are intended to be samples for guidance only and must not be used as is. Juniper Networks SSG 5 and SSG 20 The Juniper Networks Secure Services Gateway 5 (SSG 5) and Secure Services Gateway 20 (SSG 20) are purpose-built security appliances that deliver a perfect blend of performance, security, routing and LAN/WAN connectivity for small branch office and small business deployments. This model allows your clients to connect through the most advanced wireless technology currently available, 802. Source NAT—The source addresses in the packets from the clients in the Trust-L3 zone to the server in the Untrust-L3 zone are translated from the private addresses in the network 192. 1. We do this for each interface on each device in the topology So lets say you have Dual ISP setup with ISP Failover. UTT AC750GW Dual Band Wireless AC Gigabit VPN Router. 2 release. To configure dual ISP link  Nov 10, 2014 I would like to show on this post how Junos can take action upon an upstream gateway 1) Create two routing instances for each ISP & cross import the routes . You must be on configuration mode to configure this. I have found lots of Juniper documentation covering various. Dual ISP NAT Failover Not One of the challenges for those who are new to SRX and deploy a dual ISP scenario is to keep the symmetry of the packet flow. One of the challenges for those who are new to SRX and deploy a dual ISP scenario is to keep the symmetry of the packet flow. Copyright IPv6 = plentiful, global addresses = no NAT Transition from IPv4 to dual stack must not break anything Good ISP strategy. 3) Changed my NAT rules for eth0 and eth1 so they would be using a source address of the proper LAN subnet. 103). I have two wan and running per-packet loadbalance (not failover). 0/24 prefix to the rest of the Internet. I understand the concept of adding a second isp, and since my bsci studies are still fresh, expect to have to implement BGP. Start configuring in SRX device. The Network Object command seem to be accepting only one NAT statement (for either of the ISPs). this article deals with the specific configuration of this feature to perform a route-failover in a typical dual isp scenario. Can this be done with the basic license (max 3 vlans) or you need to have the security plus license. That's all  I need to NAT them to an appropriate IP per ISP. We were running into the asyncronous NAT issue where the reverse route lookup for something that came in on the secondary ISP would only be performed in the default routing instance and then use the source NAT for the primary ISP. i’m a newbie at networks, i am trying to configure a juniper srx to work with 2 diffrent isp. Below is our scenario. the trafic on the network is mostly composed of some pc’s that st DUAL ISP Link failover on CISCO ASA October 2, 2014 October 2, 2014 / Chacko Abraham In Some of the scenarios most of the companies , the security appliance(ASA 5510, 5520 etc) maintains two different ISP connections to the Internet. ypascalin last edited by . It is helpful to understand what NAT (Network Address Translation) does before you see why this causes a problem with SIP (Session Initiation Protocol). 1) and Server Y (1. set interfaces fe-0/0/7 unit 0 encapsulation ppp-over-ether set interfaces pp0 unit 0 ppp-options chap default-chap-secret <PASSWORD> set interfaces pp0 unit 0 ppp-options chap local-name <USERNAME> set interfaces pp0 unit 0 ppp-options chap passive set interfaces pp0 unit… IPv4/IPv6 Strategies for Broadband ISPs 6RD / Dual Stack / DS‐Lite / CGN/NAT64/… Alain Durand 8/5/2010 IPv6 Reality Check: the IPv4 Long Tail Post IPv4 allocation completion: Many hosts in the home (eg Win 95/98/2000/XP, Playstations, consumer electronic devices) are IPv4‐only. 2 110 You can even use this command if you have a dynamic DHCP IP address from your ISP on the outside Get your ISP to stop NAT'ing on their router(s) and give you a public IP subnet; you do the same with the DSL (if it's just 1 static, you can bridge the IP across the LAN side of the DSL router so your public address will be on one of the firewall's public interfaces). We assign unit, peer-unit, specify ethernet encapsulation, and assign an IP address. Well no, the two fxp0 interfaces on each physical firewall, also get an IP address (for . 0 and evasive peer-to-peer (P2P) applications like Skype, torrents, and others. " Static NAT VIP Cisco ASA 5500 Dual ISP Connection Starting from version 7. 4. The theory of that setup is that I connect both ISP's to the firewall, and use the 20Mb line as a default internet connection, but when that one dies, I automatically get switched to the backup line (256kbps). For this test to be successful, you must have SOURCE NAT  I also need to setup 3 virtual routing instances, and two DMZs, with the rule source-nat-rule match source-address 0. Choosing the best dual-WAN router may prove to be a bit difficult since this type of devices weren't created for home use, their functionality and complexity being way beyond the needs of the usual user (setting up a multi WAN router can be tedious and, sometimes, outrageously confusing). Destination NAT on Juniper SRX in a dual ISP environment: dealing with Routing Instances February 18, 2017 February 24, 2017 junipertrain It is common for branch offices to have two Internet connections for redundancy. What we want to accomplish is, if primary ISP’s link fail, then switch the link through secondary link to ISP B. This will allow for ISP failover without dynamic routing protocols such as OSPF or BGP. However, all information can be taken from "show security flow session" output, as shown in the cheat sheet below: Site A: 2x SRX 220's running in a cluster with a dual-ISP setup. 249. Hi, I am trying to configure Dual ISP feature in ASA 5506-x, like the one which is available is ASA 5505 with two different outside interfaces. However I have few questions: 1. [edit security nat destination] root@srx#set pool MailServer address 192. One ( XS4ALL ) for basic Internet Access via VDSL, and one our (VoIP) phone provided by Ziggo . Y. Assign multiple external ips with Juniper SRX100 set security nat static rule-set hi. Big organizations have migrated from Cisco to Juniper / Alcatel Lucent respectively and the bidding prices for these projects is between 10-100 millions. This paper is from the SANS Institute Reading Room site. I've been asked to investigate adding a backup isp. They will share routes via rib-groups, and the default route and source NAT configurations in the corp routing instance would control which ISP/routing instance is used. If you have over 64,000 connections going through the firewall into a single IP, you can have multiple IP addresses in the pool and the SRX will alternate between the IP addresses defined in the pool. Take note that the pool will either be defined a source pool or destination pool. VRRP dual ISP setup. 16. 2 help configure dual isp on juniper srx - posted in Networking: hi. They have 3 ISP connections. Suppose we have a primary high-speed ISP connection, and a cheaper DSL line connected to a Secondary ISP. These protocols can be used to build very powerful and redundant networks, however there are some screenos specific issues with these implementations, and these issues may introduce a little bit of complexity in the design and configuration of your Juniper device. This article contains a sample configuration for J-Series and SRX Branch with dual ISP connection. This is what we wanted to do first of all when dual links are functional. i want to have redundancy is one hi. You can also assign a metric to each ISP connection. Reposting is not permitted without express In NAT mode, t the trust alw our ISP infor mation avail I have a single Juniper SRX100 setup between several servers and a WAN. pfSense is an open source routing and firewall software that is based on the FreeBSD distribution. They’ve made it easy for administrators with modest networks to easily accomplish network redundancy and load balancing. Note that this is generally done by higher-end routers such as Cisco and Juniper and especilly configuring route-maps to facilitate this can be difficult. 11 Public IP from ISP 1: 96. My questions revolve around, not getting out to the internet, but ensuring that our e-business gets back up quickly and is available. 1 prefix-length 24 Feb 6, 2009 You can set up multiple areas in one Juniper device and BGP at the . Through the 2004 acquisition of NetScreen Technologies, Juniper acquired the Juniper Secure Meeting product line, as well as remote desktop access software. The Layer 3 router should have at least two Layer 3 WAN network interfaces. I need to NAT them to an appropriate IP per ISP. Dual ISP with destination NAT. Juniper SRX - Configuring PPPoE | Juniper - SRX Series Gateway. i want to have . security { nat { source { rule-set trust-to-untrust { from zone trust; Jun 17, 2015 One of the challenges for those who are new to SRX and deploy a dual ISP scenario is to keep the symmetry of the packet flow. From our overview of Internet routing, you should realize that routing in the Cisco Firewall :: Use Dual ISP's With ASA5505? Oct 1, 2010. Then create rule for POP3 (110) service. Each router has two ethernet ports, Ethernet port 0 is connected to the other router, while ethernet port 1 is connected to your LAN. net. For traffic originating from outside, we have static NAT for one of the ISP and now I want to be able to access the internal servers using the other ISP too. Even if Global Connect clients need to be considered as part of the local network, to facilitate routing, Palo Alto Networks does not recommend using an IP pool in the same subnet as the LAN address pool. The goal of this recipe is to achieve failover, where the primary ISP is used 100% of the time, and the secondary ISP is used only if the primary goes down. SRX Series,vSRX. It included firewalls, flow monitoring, filtering and Network Address Translation (NAT). The last couple of years, we've had two ISP's on premise. You can find more information on NAT by reading through our NAT Articles. This document also explains how to configure Network Address Translation (NAT) when there are multiple ISP's for internet connectivity and you want seamless failover i. Technical Note : Configuration example of Policy Based Routing and VIP for SMTP services in Dual Wan scenario in a dual Wan scenario. Breaking it down we are creating a network using the logical tunnel interfaces. The branch site will have a router or firewall that will make use of both connections by leveraging NAT and some sort of tracking or performance algorithm to determine which connection to use. By Joseph Naughton DAY ONE: DEPLOYING CGNAT ON THE MX SERIES Here comes an example on how to configure policy-based routing (PBR) on a Juniper ScreenOS firewall. I won't go into details regarding the security policies or NAT configuration. If the NAT was supposed to happen first, how does the ASA determine which Dynamic PAT configuration to use if it hasnt chosen the outbound interface for that packet. juniper dual isp nat