0
votes
1answer
47 views

How is my GRE-Tunneled packet being routed? [closed]

I'm trying to figure out exactly what is happening when I create a GRE tunnel. My network looks like this (-> means directly connected): Computer A (eth0: 10.0.1.1) -> (eth0: 10.0.1.2) Router B ...
-1
votes
1answer
31 views

GRE tunnel / Route traffic based on which domain the user is trying to access

Imagine this kind of setup. 5 servers. 1 server will be the "front-end", all the traffic has to go through it first before going to the 4 other servers. I don't want people to know the IPs of the ...
-2
votes
1answer
112 views

GRE tunneling in vmware vsphere guest [closed]

Is it possible to make a GRE tunnel between a dedicated linux machine and a vmware vsphere guest VM (running debian wheezy)?
0
votes
1answer
314 views

openvswitch: connecting two virtual private networks on two different machines with gre/ipsec

Here is the setup: We have a hardware (server) that presents a service to the customer (or "outside world", if you so will). Internally, the services and functions are distributed over several virtual ...
0
votes
0answers
109 views

How can I add encryption to a GRE tunnel?

I'm using a GRE tunnel on a few Ubuntu servers to join multiple AWS regions in separate VPCs into one internal network to reduce the number of IPs I need, as well as network complexity. Right now, my ...
-1
votes
1answer
120 views

How to check for GRE Tunnels [closed]

Is there a way to check for GRE Tunnels? I've heard spammers will use GRE tunnels to send mail from a central machine out of another and would like to check for possible GRE tunnels.
0
votes
2answers
134 views

Why two addresses in configuring a GRE tunnel?

As I can find in this support document, in order to configure a GRE tunnel between two routers R1 and R2, I issue the following sets of commands (mtu and mss omitted), R1 R1(config)# interface ...
0
votes
1answer
692 views

How to force certain traffic through GRE tunnel?

Here's what I do. Server (public internet is 222.x.x.x): echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf sysctl -p iptunnel add gre1 mode gre local 222.x.x.x remote 115.x.x.x ttl 255 ...
1
vote
0answers
491 views

OpenNHRP configuration without IPsec

I'm attempting to use OpenNHRP on a linux box to connect with a Cisco Router. I want to allow GRE tunnels from the linux box to the Cisco router dynamically, but I'm not implementing DMVPN on the ...
1
vote
1answer
264 views

How to forward all GRE traffic to a particular network interface?

I want to forward all GRE traffic (IP protocol 47) coming on eth2 to br0 on my machine. How can I do that?