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Questions tagged [gre]

Generic Routing Encapsulation (GRE) is a tunneling protocol, developed by Cisco.

Generic Routing Encapsulation (GRE) is a tunneling protocol, developed by Cisco.

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Open VSwitch - Connect two virtual networks through two physical networks

I managed to setup the following network configuration : HOST1 and HOST2 are two physical machines running Debian OS. They have both two network cards (eth0 and eth1), each of them connected to two physically separated network and with different…
Fab
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Want to set GRE as the default network

I have configured 2 servers, SERVER A and SERVER B. (I have followed this tutorial: https://community.hetzner.com/tutorials/linux-setup-gre-tunnel) I have used SERVER A for GRE tunnel to SERVER B (Meaning all traffic sent to server A shall be routed…
Ishan k
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send all traffic from Wiregurad to GRE Tunnel

I'm new in the Linux world so I don't know how to do the IPtable configs. my scenario is like this: I have a MikroTik and an UBUNTU Linux server. I created a GRE Tunnel between them and it works well. I also created a Wireguard on my Linux server…
Fredy
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GRE tunnel doesn't forward connection from proxy to server

I'm trying to setup a GRE tunnel for an anti-dos solution for my Minecraft hosting. Server A is the server which forwards the connections to the backend server. Server B is the backend server. Whenever I connect to a normal Minecraft server on…
sidboy55555
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Connection Refused (GRE Tunnel - FiveM)

I am running a game server using Vultr. What I am trying to do is run the game server (backend server) through a GRE Tunnel. For this, I am using x4b.net for my GRE Tunnel. A few things to note: The guide that I used is listed here:…
Andromeda
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Force UDP traffic to exit through the GRE Tunnel

I have an application that suffers from ddos. So we put it behind a filter that works on the basis of GRE. The filter works fine, but the application has a subapplication that answers to other ports and ends up answering to a different IP as well…
Joabe Meirelles
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GRE tunnel. Port Forwarding with IPTables from VPS to Local Server not working

Dear ServerFault community, I have an OVH VPS with 3 public IPs (1.1.1.1, 2.2.2.2, 3.3.3.3) and I am trying to forward them individually, with one tunnel for each IP, to a server in my office (IP 5.5.5.5) with port forwarding. This so that I can…
Nicolò
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How can I setup and verify GRE tunnel pn ubuntu server?

In the scenario below, I'm going to configure SQUID and WCCP for web caching mechanism. Currently, WCCP is configured on router and squid is configured on UbuntuServer, but really I do not know anything about GRE tunnel and how it can be configured…
Mehran
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Cisco GRE routing semantics to ip_gre

I am reading this article about setting up a GRE IP Tunnel: https://packetpushers.net/anatomy-of-gre-tunnels/ There's a section about creating a GRE tunnel interface on router A R1: interface Tunnel100 tunnel mode gre ip address 102.1.1.1…
ohroblot
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Connecting to server via VPN

There is a server with connection via VPN to it (using GRE protocol). I have got a problem to connect to this VPN from home network, because GRE is not allowed by provider. But I have got another work server (with SSH connection to it from home) in…
Daria Romanova
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setting up gre tunnel on debian with tunnel source and tunnel destination

I am trying to setup a gre tunnel on debian to receive broadcast packets. I have the information for an interface ip address [10.16.2.4 255.255.255.192] tunnel source [10.16.0.2] tunnel destination [10.16.254.1] When I try to create the tunnel with…
chllres
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Routing one machine's traffic through GRE tunnel to a remote NAT

I had to solve the following dilemma for a friend and thought I'd document how we did it here... Here's the situation: His home network 192.168.1.0/24 and it sits behind a Linux router that performs NAT and has public IP address A.A.A.A. The Linux…
Archie
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Use working GRE tunnel as default on remote server

Purpose is to "protect" my backend dedicated server (B) using a front VPS (A) with a GRE tunnel and use the the new stablished interface (GRE1) as default on (B) in order not to leak the server (B) IP address. That means backend server (B) will be…
safect
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PPTP & GRE issue iptables/NAT

This is my first post and will try my best to add all the info. I am trying to accomplish something that i am not sure if it is supported, basically I have a firewall that is configure to allow everything for now. I have a Linux machine that acts…
Arsi
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How can I set up a point-to-point IPv6 GRE tunnel encrypted with ipsec between my Mikrotik CCR2004 router and a Linux host running Strongswan?

I need to encapsulate IPv4 in IPv6 for routing purposes. One end is a Linux box running quagga, and the other end is a Mikrotik CCR2004. How?
Falcon Momot
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