Options. WORKAROUND. FINDINGS. IPSec is configured intransport modewhich means that it only encrypts data, it doesnt use any native IPSec tunnelling functions. zscaler gre tunnel best practice. Lets say you have a design like this. Navigate to: ZIA > Analytics > Tunnel Insights > Logs, then check Tunnel Status and Event Reason (Make sure that these options are enabled in view): Have you enabled GRE keepalive in Palo Alto side? You are trying to maintain a GRE tunnel through the GRE tunnel at this point. This also leverages ECMP. The edge routers build the GRE tunnel across the core network. I have typically decided not to use tunnel keepalives in this environment. Required fields are marked *. If you use an IP as the source this does not happen. GRE stands for Generic Routing Encapsulation, which is a very simple form of tunneling. Notify me of follow-up comments by email. 06-10-2022 This address will be our Tunnel's one end IP address. If youve used IPSec before, you may have used crypto-maps. The LIVEcommunity thanks you for your participation! GRE tunnel uses a 'tunnel' interface - a logical interface configured on the router with an IP address where packets are encapsulated and decapsulated as they enter or exit the GRE tunnel. Just resolved an issue with our new WAN deployment and it all came down to an improper MTU size on a GRE tunnel. We create profiles, but in the background, the router is dynamically creating crypto-maps for us. My question is, sometimes when I configure gre or gre over IPSec tunnels using a loop back as the source and the remote loop back as the destination I end up with a weird situation. Copyright 2007 - 2022 - Palo Alto Networks, Enterprise Data Loss Prevention Discussions, Prisma Access for MSPs and Distributed Enterprises Discussions, Prisma Access Cloud Management Discussions, Prisma Access for MSPs and Distributed Enterprises, https://community.zscaler.com/t/gre-tunnel-from-palo-alto-firewall/8024/2, Palo Alto Dual ISP, ECMP enables the external interfaces and enables IPSEC VPN tunnels, Pre-logon tunnel not disconnecting after logon, Windows 10 - Allow Pre-Logon, Windows Hello sign-ins and SSO, Zoom shows offline after connecting to Global Protect VPN. DNS Security. We also set transport mode here. The TL;DR version is we had our MTU set to 1460 and performance was bad enough that TCP SSL session would frequently fragment and drop. We start by configuring the IKE policy. This website uses cookies essential to its operation, for analytics, and for personalized content. GRE Tunnels; GRE Tunnel Overview; Download PDF. In other cases it may be preferable to terminate GRE tunnels on physical interfaces. First step is to create our tunnel interface on R1: R1 (config)# interface Tunnel0 R1 (config-if)# ip address 172.16..1 255.255.255. Take a moment to remember howGRE is configured. On the network device, exclude the IP address ranges ( 146.112../16 and 155.190../16) to the IPsec tunnel. Yes, I have enabled GRE keepalive in Palo Alto. Note: The routers used with CCNP hands-on labs are Cisco 4221 with Cisco IOS XE Release 16.9.4 (universalk9 image). - The GRE interface will remain unnumbered and remote subnets reachable with static routes. Not to mention that convergence is faster if you dont have to wait for timers to expire. What we have here is calledRecursive Routing. 06-14-2022 01:40 AM. This means that traffic will still enter the tunnel, but it will get blackholed. In cases where the router may have public IP addresses on its outbound interface (which may be the case with your carrier ethernet and DSL) it is easier to accomplish this when using the outbound physical interface then it is with a loopback interface address. However, it is best practice to terminate the tunnel ahead of your firewall so it can inspect inner packets. They are not dependent on a specific physical interface being available. shape-mcast In theory, GRE could encapsulate any Layer 3 protocol with a valid Ethernet type, unlike IPIP, which can only encapsulate IP. If youre using an IGP, theneventuallyit will notice that the peer is down (thanks to hold timers) and remove it, reroute traffic. Of course, you need to make sure you have the corresponding configuration on the remote device. Below is a list of required and optional infrastructure services that should be reachable over the device tunnel connection. For example keepalive 10 3. Use this command to configure a GRE Tunnel for your FortiGate, to allow remote transmission of data through Cisco devices that also have a GRE Tunnel configured. Step 1: Log into the router's Setup Page. The simplest option is to set the MTU to 1400, and the MSS to 1360 for a regular ethernet interface. Applicants have the option to select GRE test type: (i) GRE General Test (ii) GRE Subject Test . GRE Tunnel Lab. Or a larger number of gre tunnels terminating on the same interface? Part of the magic of GRE is that the other end does not need any special configuration to listen and respond to the keepalives. In this setup I often lose the ability to ping the remote loopback unless I source the ping from the local loopback. For starters, what if you had more than one path from one router to the other? GRE encapsulates packets into IP packets and redirects them to an intermediate host, where they are de-encapsulated and routed to their final . Obviously I'm not dealing with huge amounts of data, since all my carrier ethernet links are 10Mbit. I've created two tunnel interfaces, set up the GRE Tunnels for the two interfaces, enabled NAT and policy based forwarding. They offer one free practice exam and additional section-specific practice as well. In some environments it may be preferable to use loopback interface addresses to terminate GRE tunnels. This will send keepalives at regular intervals. When building GRE Tunnels for connecting the ABRs that summarize the non-backbone areas, the Tunnel itself should be built through Area 0 though the GRE Tunnel interfaces belong to a non-backbone area. Hi@PavelKit shows for both tunnel status and event reason none and none. This is the socket in software that is open and listening for traffic. Everything is encapsulated in an extra layer of UDP, to trick IKE into thinking that the packet has not been altered. Use these resources to familiarize yourself with the community: There is currently an issue with Webex login, we are working to resolve. We can also use GRE to tunnel routing protocols like RIP, OSPF . Since the top router is the end of the network infrastructure, we can safely just advertise a 0s route to the top router from the bottom router so all of the traffic will come down and take the more specific prefixes that the bottom router knows about. If your routing is sane, it will be available. The Tunnel IP address is the IP address of the GRE tunnel interface on the Arista AP. Note: This lab is an exercise in configuring and verifying various implementations of GRE tunnels and does not reflect networking best practices. It is best practice to enable keepalives. Please use Cisco.com login. Configure the IPsec tunnel to exclude SWG traffic. ramesh.mani1 (Ramesh Mani) March 30, 2021, 8:22am #2. I have implemented GRE tunnels with IPSec running EIGRP over the tunnel multiple times and it works well. 1. Pretty straight forward right? This is the IPSec part. The router R1 receive this IP packet, encapsulate the original IP packet in a GRE header, adds new tunnel interface IP address 10.40.20.1 as source address & 10.40.20.2 as destination address in Delivery header and sends it out of the tunnel interface (tunnel0). The carrier ethernet will be 10Mbit bi-directional, the DSL/Cable will be typical low speeds like 3-5Mbit down, 1Mbit up. This example sends a keepalive message every 10 seconds. To practice with the GRE tunnel, I did a lab with four routers R1 to R4 all connected in a chain with two more routers as end clients: R5 connected to R1, and R6 connected to R4. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. The GRE header looks like: Note that you can transport multicast traffic and IPv6 through a GRE tunnel. Not only that, but it's through the GRE tunnel. a gre tunnel is a logical interface on a cisco router that provides a way to encapsulate passenger packets inside a transport protocol. GRE over IPSEC. A Cisco doc about this here, http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094690.shtml, Your email address will not be published. Below you will find all tunneling and GRE labs: Site-to-Site IPSEC VPN. Another item to note is the maximum transmission unit (MTU) you set for the tunnel. Of course, this can change if you have jumbo frames. This includes timers in an IGP orIP SLA. - edited If the default route or all 80 ,443 towards GRE , then you need to create bypass on PAC and network. This is a problem if we want to tunnel through a public network like the internet. ; Step 2: Click on the Internet tab and select GRE Tunnels in the drop-down menu. You get practice questions for verbal reasoning and quantitative reasoning. The IGP relationship then drops, causing traffic to be redirected over the core, causing the tunnel to come up again. This is an area we can tune. So, whats the difference? GRE Tunnel knows as Generic Routing Encapsulation is a tunnelling protocol developed by Cisco that provides the encapsulation of an extensive number of network layer protocols inside point-to-point links. Help the community: Like helpful comments and mark solutions. Hi Pavel, it shows in the system logs critical and "Tunnel GRE-ZSC is going down" for both tunnels. That means that the tunnel is generally dependant on the underlying interface. The other workaround is to use another technology to determine if the tunnel is up. Router ONE Configuration. I'm not sure how I should continue with troubleshooting from here. If the interface goes down, so does the tunnel. The GRE test is timed and takes about 3 hours and 45 minutes to complete the exam. At new site (Site A) I have a 1941 w/sec and 4 physical interfaces. Tunnels terminating on loopbacks give you a lot more flexibility. In the first two commands ("interface tunnel " and "ip address "), we enter interface tunnel mode and configure IP addresses of the GRE . There are two modes that this can be configured in. When the GRE tunnel goes down are you able to ping from the interface that is used to build tunnel the Zscaler's PSE IP address? Notice that in the topology below, R1 & R2 are not directly connect to each other. So the best practice? Not only that, but its through the GRE tunnel. Basically,keepalives do not work. ; Step 3: Click Add to create a new tunnel. For more information, see About the ZIA Cloud Architecture and GRE Deployment Scenarios. Finally, we set the pre-shared key, and configure this device to allow connections from0.0.0.0(any device). Since this question is already being discussed I thought I'd jump in and get clarification of my own. NAT-T is automatically enabled during the phase-1 exchanges if NAT devices are detected. A loop back interface is up 100% of the time and will mean your router id won't fluctuate due to links going down. Hello. Instead, we can configure loopback interfaces. There are two main reasons that can cause this: There are a few tricks that can help with this. Tunnels terminating on loopbacks give you a lot more flexibility. The official answer from Zscaler is to open a support ticket and troubleshoot it in real time with support staff. If it is reachable and you do not have any connectivity issue, I would open a ticket with Zscaler. See below for an example of configuring GRE tunnels, with a network diagram for clarity. The router on the left has a summary route for 10.20.0.0 /16, pointing toward the core. Zscaler best practices advise that GRE Keepalives and DPD packets are sent no more . That can't happen. Lets take a look at a quick example so you see what I mean. Below you can see the configurations. 10:39 AM. In some environments it may be preferable to use loopback interface addresses to terminate GRE tunnels. I plan to build gre tunnels with keepalives over both. Would it be possible to check system logs on Palo Alto side:(subtype eq gre) ? This IP can also be called as passenger IP. To check the status of the a GRE tunnel, use the command: default# test gre gre_name ip_address GRE Tunnel Basic. The process repeats indefinitely, leaving us with a flapping tunnel. GRE is used in many instances, such as transporting IPv6 traffic over an IPv4-only network. Why does this situation occur and what can fix it? New here? The instant you turn this up, it will break. led number . Layer 7 Health Checks. GRE tunnels are often used for connectivity to services in the cloud and partner networks. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. The first is periodic. -show crypto-session on the core shows DOWN-NEGOTIATING. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. To answer one of your points directly, a tunnel with "tunnel source Eth0/0" will work fine, but loopbacks come with some advantages. I will probably have the same or similar at the sites to follow. DMVPN as suggested by Paolo is a possibility. The below example explain about how to create simple GRE tunnels between endpoints and the necessary steps to create and verify the GRE tunnel between the two networks.R1's and R2's Internal subnets (192.168.1./24 and 192.168.2./24) are communicating with each other using GRE tunnel over internet. 5 - McGraw Hill GRE Practice Tests. Other routers and Cisco IOS versions can be used. I'll be doing a VPN over the carrier ethernet to each site, and an additional VPN over DSL/Cable to each site. I'll be using EIGRP for route discoveries over the gre tunnels. Loopbacks arent physical, and therefore, they dont go down on their own. You can see the crypto maps that have been generated with: IPSec may optionally have keepalives (this is different toGRE keepalives, which well talk about later). Traffic is now being blackholed. But GRE tunnels with IPSec running EIGRP is also a realistic possibility, and perhaps preferable if you really want traffic from the spokes to go through the hub. Part of this is creating acrypto socket. He'll thank you! This includes the encryption algorithm, the hashing algorithm, and the Diffie-Hellman group. All traffic will flow through HQ. Would there be an advantage or a use-case to binding the source to a physical interface? I have read that it is best practice to use loopback interfaces to terminate the gre tunnels. Generic Routing Encapsulation (GRE) tunnels connect two endpoints (a firewall and another device) in a point-to-point logical link. If you're using an IGP, then eventually it will notice that the peer is down (thanks to hold timers) and remove it, reroute traffic. Its quite common for NAT to be used. Toggle navigation. If that is the case: Should I use a separate loopback interface to terminate each gre tunnel? -even if the router on the other end is down, tunnel still shows green and up. Sorry, your blog cannot share posts by email. One of the advantages of DMVPN is that it facilitates spoke to spoke direct communication. If you are talking about "ip unnumbered" tunnels with loopbacks, as the interfaces (with exceptions - DMVPN/IPv6 Transition tuns etc.) Specify the Security Profile name with the security-profile commandtypically the default profile is used. The guy after you replacing that EoL box just needs to replicate the config and make it reachable. So the best practice? You will addanywhere from 56 bytes to 74 bytes of overhead, depending on these factors. In our example, we configure this aspre-share, which means well use pre-shared keys. zscaler gre tunnel best practice. To answer one of your points directly, a tunnel with "tunnel source Eth0/0" will work fine, but loopbacks come with some advantages. polaris ranger 570 engine swap; how to accept ethereum payments. This means that traffic will still enter the tunnel, but it will get blackholed. The other option is to configure on-demand keepalives, which are the default option. Ohealth un prodotto SMAR7 SA. We have two options for this; Configure an IP as the source, or configure an interface by name. Set Up Antivirus, Anti-Spyware, and Vulnerability Protection. This is part of how IPSec works, not part of GRE. I've also configured policy based forwarding and in the system logs it shows "Vsys 1 PBF rule GRE-ZSC nexthop is going down". This IP address should not conflict with any other network setting in the access point. best software licensing solutions; nelson rain train 400 parts; under eye brightener stick; vashi to badlapur bus timetable; solar system shower curtain. Tunnel . But if youre using static routes, you have a real outage on your hands. The following are the best practices for deploying GRE: Zscaler recommends that you configure two GRE tunnels from an internal router behind the firewall to the ZIA Public Service Edges. GRE is one way to set up a direct point-to-point connection across a network . session-tunnel-fib. That is, the admin distance of the route is set to 254. They are connected through R3 only. zscaler support best practices guide version 1.20 - august 2, 2017 zscaler support model many moving parts 1 -traffic forwarding - pac, gre tunnels, ipsec, egress points 2 -authentication - sso (saml, kerberos) If your routing is sane, it will be available. -tried monitoring the tunnel on the far end router side but the tunnel stills shows green in an UNKNOWN state. Press question mark to learn the rest of the keyboard shortcuts. The process of moving services or replacing hardware is simplified. One possibility is to use a different routing protocol for the overlay and the underlay. That way, we can still learn any route from the bottom router and still know how to get to the GRE tunnel destination. Tunneling and GRE. The first isto use IPSec as a crypto map, rather than applying it to the tunnel. I can favor the routes over carrier ethernet using the bandwidth setting on the gre interfaces. How GRE Works | VPN Tunnels | Computer Networking | Part 1Have you ever wondered "How does a GRE Tunnel work?" "How do I encrypt GRE" "What are the best prac. Packets can be routed or forwarded through this tunnel. In this case, the number of seconds is the maximum time a router will waitwithout seeing traffic from its neighbour, before sending a keepalive. I've done some searching, but so far haven't found an answer on which would be a better approach. You must control web traffic with a PAC file, proxy chaining, or AnyConnect secure web gateway (SWG) security module. On the M3, this parameter only enables tunnel-based forwarding, as session-based forwarding does not apply to this platform. This is where we run into problems. The bottom router will advertise a 0s route with a better admin distance to the top router. The GRE Tunnel Profile name is specified in the gre name. This is considered a better path to 10.20.20.20, as its a longer match than the /16 it already has. audio technica ath-m50xbt2 best buy; sm-uart-04l datasheet; eastern shore swap and sell auto; telecaster pickguard custom. Increasing the MTU to 1476 fixed everything and improved performance by 2x (250Mb/sec 2-way vs. 500Mb/sec 2-way). any suggestion please.. Hi everyone, I understand there's two options for defining the source of a GRE tunnel; the source interface, ie Gig1/0/1, or by using the IP address of a physical or logical inter In this lab we will configure GRE Tunnel between R1 & R2. A tunnel source needs to be configured. This means that if a destination IP address is unavailable, the tunnel interface will stay up. The following table shows all newly added, changed, or removed entries as of FortiOS 6.0. When we issue the Interface tunnel command, we create a logical interface on the router and name it appropriately. Hi Pavel,it shows in the system logs critical and "Tunnel GRE-ZSC is going down" for both tunnels. This feature is crucial for organizations who expect users to log on to devices the first time remotely. Required Because you are learning a better route to your GRE peer through the GRE tunnel itself. They both use IP's in the 192.168.1. network for the tunnel. Post was not sent - check your email addresses! In this article, well look at GRE in-depth, covering: Before starting, understand how GRE and IPSec work, [maxbutton id=4 text=GRE Tunnels url=https://networkdirection.net/GRE+Tunnels][maxbutton id=4 text=IPSec url=https://networkdirection.net/IPSec+Basics]. The tunnel is now built, and the network administrators decide to configure an IGP, such as EIGRP or OSPF. They are always up. With this, we create a profile and assign the transform-set to the profile. Do I have to add a next hop in the policy based forwarding? The LSAT Flex only has 3 sections in it one each of the reading . are point to point in nature, referring to a next hop interface provides enough information to get the packet to its next hop, unlike say an ethernet interface where the next-hop would have to have a L2 mapping. It also has several networks in the 10.20.0.0 /16 range. The Quantitative Reasoning section also contains two sections, but each section is timed for 35 minutes. The top router will try to install that route in its FIB and then realize that this better route supersedes the route it used to build the GRE tunnel. They are not dependent on a specific physical interface being available. GRE Configuration is a very simple configuration. We also need to configure the authentication method. Connectivity Alternatives to GRE Tunnelling. If there is only one interface that gets to the tunnel destination then there is little benefit in using loopback interface address to terminate the GRE tunnel. Depending on the model and Cisco IOS version, the commands available and the output . If you are using Tunnel 2.0 for devices behind a GRE tunnel, then traffic for Zscaler IPs (i.e. Regarding your question, from my point of view since GRE tunnel is point to point, it is not must to add next hop along with egress interface, however a sample configuration from Zscaler has next hop set:https://community.zscaler.com/t/gre-tunnel-from-palo-alto-firewall/8024/2so it will not hurt to add it to PBF. Last Updated: Sun Oct 23 23:47:41 PDT 2022. GRE does not have any built-in encryption. The keepalive is double-encapsulated, so the remote peer receives the keepalive, decapsulates it, and is tricked into sending the response back to the original source. Please note that when were talking about IPSec, we talk about phase-1 and phase-2 tunnels. However, I do still recommend configuring keepalives on both ends of the tunnel. Router-id can effectively do the same thing but won't provide a testable interface. Personally, I like each service split to its own loopback on devices that have a lot going on. For example, tunnel.1 . If so: Should I terminate multiple gre tunnels on one loopback interface? The size of the headers varies depending on encryption type, whether NAT-T is used (another 8 bytes) and other factors. When it learns an IP (provided the default gateway option is set in the DHCP response) the router will insert a static 0s route called a floating static. Press J to jump to the feed. I'm currently setting up what will the first site with approximately 5 to follow using carrier ethernet as primary connectivity and DSL/Cable as backup. They are always up. "Encapsulating" means wrapping one data packet within another data packet, like putting a box inside another box. Solution SSID profile should be configured in NAT mode If two links are available, and one were to fail your routing protocols keep the tunnel working away. That way, we can still learn any route from the bottom router and still know how to get to the GRE tunnel destination. Deploying GRE Tunnels The following are the best practices for deploying GRE: Zscaler recommends that you configure two GRE tunnels from an internal router behind the firewall to the ZIA Public Service Edges. If you use an interface as the source (rather than the IP), the tunnel is tied to the interface. Thanks! Find answers to your questions by entering keywords or phrases in the Search bar above. You can do this with thekeepalivecommand. TIP #2Use an interface as the tunnel source. hot, cold carbonated water dispenser; satin trim baby blanket personalized; zscaler gre tunnel best practice This means that if a destination IP address is unavailable, the tunnel interface will stay up. The member who gave the solution and all future visitors to this topic will appreciate it! Can anyone explain why it's best practice to use a loopback interface for a GRE tunnel as opposed to just an IP address? The button appears next to the replies on topics youve started. GRE tunnels are stateless. Best Practices. We need to be careful how we handle routing. system gre-tunnel. This means that the maximum payload size is smaller, so it can fit into the MTU size. GRE tunnels are stateless. That would not be a problem at Site A - there would be two loopback interfaces, one for the tunnel over carrier ethernet, one for the tunnel over DSL/Cable. That cant happen. Configuration Configuration Difficulty: Expert. 06-10-2022 Theres a few tricks to help stability on your tunnel. 05:28 AM But if there are reasons why you want spoke to spoke traffic coming through the hub then DMVPN is not such a good choice. best foundation for pores and acne; capita space metal fantasy mens; ciate definer liner starburst At HQ I have a 2951 w/sec and 3 physical interfaces. When using GRE, however, the additional header has an overhead of another 24 bytes that needs to be taken into account. NOTE: Best practices is to enable this parameter only during maintenance window or off-peak production hours. Previously, weve talked about how GRE works, and how to configure it. Thanks Ramesh for your feedback. - The router should not be part of a protected network (traffic is . Fortunately, its rather easy to add IPSec encryption to the GRE tunnel. Lets you move and break off services (Management, Voice, Tunneling, PfR etc) as required without a headache. What should I be watching out for?Thanks! dolce vita women's priana; cardboard snack boxes You are trying to maintain a GRE tunnel through the GRE tunnel at this point. To set up a GRE tunnel via the Cloud DDoS portal for BGP traffic redirection. Now lets say that we want to GRE peer the two routers for the purpose of advertising routes from the data center to the top router through EIGRP (or any other routing protocol). For some reason I thought I remembered from CCNA that you could just assign an IP address that wasn't tied to an interface to a tunnel but I see now that this is wrong which makes sense anyway. At least not in configuration. Ethernet MTU is generally 1500 bytes. But this only really covers the basics. The tunnel has a longer prefix match to the network that the real IP lives on. Perhaps you can use a static route to reach the real IP and a dynamic routing protocol over the tunnel. Basically, my question is, what's better: a larger number of loopback interfaces? T 091 210 34 98 Email: . These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole! Ive known this one for a long time, but once and a great while, I set one up and forget to do this. The top router is going to have DHCP enabled on its southern interface and learn an IP address from a cable modem with an active internet connection. It needs a source and destination in order to build the tunnel. Mix the two together, and you have a winner! Were going to get a little Cisco-oriented here, but these tricks will likely translate well to other vendors. This enables one IPSec peer to detect the failure of another. When the gre module is loaded, the Linux kernel will create a default device, named gre0. You cant get longer than a /32 (with IPv4 anyway), so that goes a long way to solving problem 2. NAT-T adds an additional header to each encrypted packet. This is where traffic should route over the underlay, but tries to route over the tunnel instead. 12-02-2010 sk157893: Check Point recommendations for tunneling through IPsec instead of GRE. - edited A static /32 route for your GRE peer on the top router. tioga downs hotel reservations. If you are sending only proxied traffic and only zscaler destinations towards GRE, then only PAC bypass is enough. This can mean that traffic will continue to flow into the tunnel, even if it should be down. Best practices for multiple GRE tunnels in a hub-and-spoke config? I know what I did wrong the instant I see this error, %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to recursive routing, The message varies by platform but it all means the same thing. Encrypted GRE Tunnel. The Analytical Writing section and the Verbal Reasoning sections each consist of two sections that are each timed for 30 minutes. It's perfectly fine, and even recommended to use PAC or Tunnel 1.0 traffic inside of GRE though. sk96071: Check Point 600/1100 Appliances drops GRE packets. Part 1: Build the Network and Configure Basic Device Settings Part 2: Configure and Verify GRE Tunnels with Static Routing Part 3: Configure and Verify GRE Tunnels by Using a Routing Protocol Part 4: Examine the Recursive Routing Problem with GRE Background / Scenario
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