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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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Attempting to GRE tunnel IP block through public IP (OVH > Hetzner)

I am attempting to route an IPv4 /28 block through my OVH server to a server I have with Hetzner through their main public IPs. I found a guide attached below but I am unable to ping 164.132.xxx.1 externally. 164.132.xxx.1 does ping from the OVH…
Toodarday
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Reach private subnets on secondary interfaces between GRE tunnel endpoints

I have two servers in different locations. Each server has an eth0 with a public IP (internet accessible) and an eth1 with a private IP connected to the internal network. Server A eth0: 1.2.3.4 (public IP) eth1: 10.0.0.10/24 Server B eth0: 5.6.7.8…
George Tasioulis
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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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does google cloud support ipsec encapsulated gre tunnels

I can't seem to get a pim set up on google cloud where multicast traffic is sent over a ipsec encapsulated gre tunnel. Does google cloud ec2 instances and network block this type of traffic?
neoh
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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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Subscribe to a multicast broadcast after connecting to GRE tunnel

I created a gre tunnel to a ip that's doing multicast broadcasting. I look at tcpdump and I see that there are two messages that keep repeating PIMv2 98 bytes long Info Hello IGMPv2 72 bytes long Info Membership Query, General I think the tunnel is…
chllres
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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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EdgeRouter Route Incoming Traffic to another Public Network/Server

I am curious if this is possible in theory? At my colo datacenter, I have a lot of public IP addresses (/21) on a 1GB circuit using an Edge Router 6P (not using BGP). I want to temporarily rent a server in another data center until I can get more…
Marc Pope
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A gre tunnel between Mikrotik and Cisco router

I really need your help I'm trying to connect a Mikrotik router with a Cisco router with GRE tunnel using Public IPS the problem is when I try to configure keep alive between both routers the tunnel is down when there is not keep alive the tunnel is…
Ibrahim Salah
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Setting up a GRE tunnel on Windows Server 2019

I am trying to etablish an GRE tunnel to my Windows Server 2019, which seems easy enough. Although things get a bit complicated, as I want my applications to bind to the IP on the other side of the tunnel. My setup would look like this: Visitor ->…
mclc
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