Routing between ipsec tunnels Route-based is like opening a road and letting any approved vehicle drive based on GPS routing. IKE Phase 1 —IKE is a key management protocol standard used with IPSec. Feb 24, 2014 · Introduction This document describes a scenario where user wants to implement routing between 2 Site to Site VPN Tunnels. The VPN tunnels between Point A and Point B, Point B and Point C are up. The settings specified in the VPN wizard for configuring the IPsec tunnel can also be customized later to modify the IKE version, the IKE mode, or to specify custom security associations (SAs) and other Aug 1, 2019 · I would like to configure the routing in a way that these resources are accessed by CLIENT's site through that tunnel and MAIN's gateway. Configuring a secure tunnel over ExpressRoute allows for data exchange with Aug 7, 2006 · we have cisco 1841Hsec installed in our main office & 2 ipsec site 2 site configured to branch offices, & they are working ok, but i discovered that from main 2 branch its working fine both ways but from branch 2 branch there is no traffic & when there is traffic traffic to main office stops, & what This article helps you configure secure encrypted connectivity between your on-premises network and your Azure virtual networks (VNets) over an ExpressRoute private connection. Feb 13, 2025 · Configuring MikroTik RouterOS GRE Tunnel Over IPSec - Making Sense of The InfiniteIn this guide, we’ll walk you through the process of configuring a GRE (Generic Routing Encapsulation) tunnel over IPSec (Internet Protocol Security) on MikroTik RouterOS. 2 days ago · IPSec VPN tunnels can also be configured using GRE (Generic Routing Encapsulation) Tunnels with IPsec. You can refer to this topology and deployment guide in scenarios where you need VPN connectivity between an on-premises third-party VPN device and Azure VPN, or any cloud environment. Hardware Used ASA 5520 Topology Problem All Firewalls used are Cisco ASA 5520. Bear in mind that these settings are for tunnels with static IP addresses. Hub Sep 8, 2022 · Description This article gives a brief configuration example from one spoke to other spoke using IPsec, through the Hub firewall. Policy-based is like giving a specific person a ticket to enter a gate. IPSec tunnels are in the interface modes. 4 or higher, if you have internal IPv6 networks and an external IPv6 networks, you can send traffic between the internal IPv6 networks with 6in6 tunnel routes. 168. All FGs have appropriate firewall rules that allow traffic through the tunnels. What is BGP? Border Gateway Protocol (BGP) is a standardized exterior gateway protocol used to Jun 10, 2016 · The CLI guide states: to use dynamic routing with the tunnel or be able to ping the tunnel interface, specify an address for the remote end of the tunnel in remote-ip and an address for this end of the tunnel in IP. Unlike policy-based VPNs, for route-based VPNs, a policy refers to a destination address, not a VPN tunnel. GRE tunnels offer a simple yet powerful solution for securely transmitting data across untrusted networks. SPOKE-1 -> IPSEC -> HUB -> IPSEC -> SPOKE-2 Assuming already Spokes to Hub VPNs are established. HQ and Brand Fortigate FW are connected via VPN IPsec Site to Site, everything is working fine, we can ping and have access from servers and ressources LAN to LAN from both side. While Jul 6, 2024 · This article contains steps to configure OSPF routing over an IPsec VPN tunnel using the Sophos Firewall. . Understanding the fundamental differences between GRE and IPsec, and when to use each, is crucial for network administrators and IT professionals. Jul 18, 2013 · Hello, I have a question about how FG handles traffic originating from the FG itself. In this guide, the VPN Wizard is used to configure IPsec tunnels. When Junos OS looks up a route to find the interface to use to send traffic to the The tunnel routes are 6in4 routes, which means traffic is routed through a GRE tunnel within the IPv4 IPSec tunnel. Dec 12, 2024 · Traffic selectors in IPsec VPN are typically only used to establish the tunnel and are not actively enforced for routing decisions in Azure unless explicitly configured. Jul 24, 2025 · GRE vs IPSec : Comparison Table Related FAQs Can we use GRE and IPSec together? Which is more secure, GRE or IPSec? When should I use GRE over IPSec? Does GRE encrypt the data it tunnels? What is the overhead difference between GRE and IPSec? GRE is a tunneling protocol that encapsulates various network layer protocols, but it lacks encryption. Oct 21, 2024 · This document describes steps required to configure and troubleshoot IPSec VPN tunnel between Cisco Secure Access and Cisco IOS XE using BGP and ECMP. Jan 24, 2025 · This article describes the steps to route Sophos Firewall-initiated traffic through an IPsec VPN tunnel. The traffic generated by the branch office (BO) firewall is routed to the IP address 172. This is only available if the type is tunnel. Policy-Based VPNs exchange the remote and local subnets. Policy-Based VPN is best for simple set up and Route-Based VPN is for complex topologies. You can use Microsoft peering to establish a site-to-site IPsec/IKE VPN tunnel between your selected on-premises networks and Azure VNets. When combined with IPSec, it adds Aug 10, 2006 · 2) Please double confirm the IPSEC tunnels between 1841, cairo & merica are up. Note: Dial-up IPsec to IPsec communication is not possible. The workaround to asymmetric routing does not resolve the issue. Chapter 7. 6in6 Routes In Fireware v12. IPsec tunnels can be configured using either the VPN wizard in the GUI, or a custom IPsec configuration in the GUI or CLI. With this feature, you can define a traffic selector within a specific route-based VPN, which can result in multiple Phase 2 IPsec security a The IPSec tunnel comes up only when there is an interesting traffic destined to the tunnel. To manually initiate the tunnel, check the tunnel status and clear tunnels by referring to troubleshooting site-to-site VPN issues using the CLI. This unlocks new dynamic routing solutions, including routing between AutoVPN and IPsec VPN peers, in addition to enabling resiliency and redundancy over IPsec VPN peers. These need to match exactly between the two gateways. Jul 28, 2024 · Overview This blog explains how to deploy dynamic routing (BGP) between Azure VPN and a third-party firewall. Oct 24, 2025 · The main difference between Policy-Based VPN and Route-Based VPN lies in how traffic is selected and routed through the VPN tunnel. In the pfSense the main LAN Interface is 10. In the following example, a Sophos Firewall connects with another Sophos Firewall. 16. 2. Setting up an IPsec VPN Configure and manage a secure Virtual Private Network (VPN) by using the Libreswan implementation of the IPsec protocol suite to create encrypted tunnels for secure data transmission over the internet. 0 FastEthernet0/0 permanent 2) Please double confirm the IPSEC tunnels between 1841, cairo & merica are up. Solution For IPsec configuration: Go to VPN -> IPSec Tunnels and select the tunnel to edit Route-Based VPNs use Virtual Tunnel Interfaces (VTIs) and automatically created static routes or exchange routes via OSPF. With route-based VPNs, you can configure dozens of security policies to regulate traffic flowing through a single VPN tunnel between two sites, and there is just one set of IKE and IPsec SAs at work. Let' s assume the following scenario: 3 fortigates - one is a " hub" and two " spokes" . IPsec is a protocol suite for encrypting network communications. Refer to that recipe for detailed instructions. Oct 17, 2025 · This document describes how to configure a policy-based VPN over Internet Key Exchange (IKEv1) between two Cisco routers (Cisco IOS® or Cisco IOS® XE) Apr 3, 2024 · The basis of this tunnel is a working site-to-site IPsec VPN as described in IPsec Site-to-Site VPN Example with Pre-Shared Keys. 255. Jul 19, 2013 · IPSec tunnels are in the interface modes. 100. 1 4) The config. 15 in the head office (HO) network. 85. 3) The config. Jul 17, 2020 · Asymmetric Routing Between IPSec tunnels Symptom In asymmetric environments where traffic may route out one tunnel but return through another tunnel, the firewall drops the traffic. With this feature, you can define a traffic selector within a specific route-based VPN, which can result in multiple Phase 2 IPsec security associations (SAs). User have enabled Sam The Transit VCNis designed to facilitate inter-routing between IPsec and Virtual Circuits, ensuring seamless connectivity while maintaining network segmentation. Then, to allow the exchange of routing information, the firewall that participates in both the static and dynamic routing process must be configured with a Redistribution profile. 10. Learn how IPsec VPNs work, what port IPsec uses, how IPsec tunnels work, and more. in burg looks fine but also better to remove below due to it is provided by the default route : The example in this chapter illustrates the configuration of a site-to-site VPN that uses IPSec and the generic routing encapsulation (GRE) protocol to secure the connection between the branch office and the corporate network. 0. When using OSPF, it is required to configure a Tunnel IP address to set up a neighbor connection. Without dynamic routing, the tunnel interfaces on VPN Peer A and VPN Peer B don’t require an IP address because the firewall automatically uses the tunnel interface as the next hop for routing traffic across the sites. To support dynamic routing (OSPF, BGP, RIP are supported), you must assign an IP address to the tunnel interface. 0 10. in burg looks fine but also better to remove below due to it is provided by the default route : ip route 192. in Alex is fine. From the LANs that are behind each FG everything is fine - I can access any network from any other network. Oct 17, 2024 · When the routing protocol isn’t the same between the locations, the tunnel interface on each firewall must be configured with a static IP address. Feb 12, 2024 · Routing between dial-up IPsec tunnels I have a central site (A) with a static IP and many other sites (B, C and D) that create dialup IPsec tunnels back to site (A) Jul 9, 2025 · In this tutorial, you learn how to create a VPN Gateway site-to-site IPsec connection between your on-premises network and a virtual network. Oct 17, 2024 · Set up static routes or assign routing protocols to redirect traffic to the VPN tunnels. 1/24 The IPSec Phase 2 connects the Oct 17, 2024 · The following example shows a VPN connection between two sites that use static routes. Oct 17, 2025 · This document describes how to configure a policy-based VPN over Internet Key Exchange (IKEv1) between two Cisco routers (Cisco IOS® or Cisco IOS® XE) This article helps you configure secure encrypted connectivity between your on-premises network and your Azure virtual networks (VNets) over an ExpressRoute private connection. 1/24 and it has a virtual IP 10. What is AWS Site-to-Site VPN? Establish secure VPN tunnels, configure routing for remote access, and enable IPv6 support for VPN connections between AWS VPCs and on-premises networks. May 28, 2024 · Two popular technologies, GRE (Generic Routing Encapsulation) and IPsec (Internet Protocol Security), often come up in conversations about network tunneling and security protocols. I would normally try doing this by configuring static routing and NAT. Oct 22, 2025 · An overview of the Site-to-Site VPN IPSec connection between your on-premises network and virtual cloud network. Jul 2, 2015 · I have a pfSense Router, which is the endpoint of a site-to-site IPSec VPN. GRE tunnels greatly simply the configuration and administration of VPN tunnels and are covered in our Configuring Point-to-Point GRE VPN Tunnels article. Configure a preshared key. 0 255. Jul 19, 2025 · In this article, you learn how to create a VPN Gateway site-to-site IPsec with High Bandwidth tunnels to establish connection between your on-premises network and a virtual network through the ExpressRoute private peering. Oct 29, 2025 · BGP Routing over IPsec VPN BGP peering over IPsec VPN tunnels can be enabled on the Meraki Security Appliance. 125. Configuring a secure tunnel over ExpressRoute allows for data exchange with Aug 7, 2006 · we have cisco 1841Hsec installed in our main office & 2 ipsec site 2 site configured to branch offices, & they are working ok, but i discovered that from main 2 branch its working fine both ways but from branch 2 branch there is no traffic & when there is traffic traffic to main office stops, & what Dec 11, 2020 · Routing problem between 2 FG Tunnel VPN IPsec Hello, I need help solving a routing problem. Aug 15, 2006 · ip route 192. Scope FortiGate. 1. Sep 7, 2022 · A traffic selector is an agreement between IKE peers to permit traffic through a tunnel if the traffic matches a specified pair of local and remote addresses. Hub has a interface zone configured that contains both tunnel interfaces to the spokes. d1 bdoc1 zrwyphr 07qgr gtrrqa eg5b nhqf e51 icga4 xp1r