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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.

134 questions
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Linux/Vyatta failover with GRE and OSPF/BGP

I have strange problem with routing failover in scenario: I'm trying do this failover via ospf or bgp, in both happens the same strange behavior with tunnels: For 192.7.0.0 TUN providing default route to R1 - main site (we need all traffic). …
orzeh
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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 Cisco router. I keep receiving the [Peer up script…
Evan
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Setting up a GRE tunnel on a Cisco ASA 5505

Possible Duplicate: Set up a GRE tunnel with Cisco PIX-506 v6.3 I'm trying to establish one half of a GRE tunnel, the other being configured by my service provider. I have a Cisco ASA 5505 running ASA version 8.2(2), ASDM version 6.2(5) Provider…
Antonius Bloch
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What's the difference between GRE and IPIP tunnel?

What's the difference between GRE and IPIP tunnel and which one is better for connecting two Linux machines?
Antonio
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how to forward all traffic over a GRE over IPsec VPN on cisco routers?

i have 2 cisco ISR 2821 and 2811 and they are connected over a site to site GRE over IPsec vpn. my question is that, how can i forward all traffic or web traffic to the other router? thanks
ata
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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?
Bruce
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GRE debug: "adding 0 encap bytes"?

What this debug message actually means? Shouldn't encapsulation add 24 extra bytes or not? For what reason encapsulation is not adding bytes to original packet in this debug message? Dec 28 23:45:39.303: Tunnel0: GRE/IP encapsulated…
Boban P.
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GRE Tunnel between Linux server and XP client

I want to set up a simple unencrypted tunnel between a linux-server (running SLES9) and a client (running XP SP3). The reason for this is that there are many network devices in between and the client does build up many many IP connections. I want to…
Nils
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Gre Tunnel Cisco Linux traffic forwarding

I setup a gre tunnel a cisco router and a Linux machine, the tunnel interface in the Linux box named pic. Well i have to forward traffic coming from cisco through the Linux box. the rules i've set in the Linux box is described as follow: echo "1" >…
Ali Mezgani
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Is it possible to find out the make/model of the router remotely?

First a little background. My company is renting some servers at the Terremark cloud. As we want to connect our servers to the infrastructure of a mobile carrier in order to restrict our end users to only be able to access our service, the carrier…
Ilya Saunkin
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GRE Tunnel over IPsec with Loopback

I'm having a really hard time trying to estabilish a VPN connection using a GRE over IPsec tunnel. The problem is that it involves some sort of "loopback" connection which I don't understand -- let alone be able to configure --, and the only help I…
alecov
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How to enable debug logging for GRE?

How to enable debug logging for module ip_gre on linux 2.6?
Boris
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Multiple GRE NAT router

Does there exist a router that supports multiple GRE connections over NAT? Im currently running pfSense, and it only supports 1 at a time. I understand why, its just a drag as there are multiple people in this office trying connect to the same VPN…
Devnull
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Is it safe to use a Linux GRE tunnel with remote IP 0.0.0.0?

I have plenty of remote servers that have GRE tunnels to a single central server. Tunnel traffic is only from the remote servers to the central server. So for 50 remote servers, I usually have 50 GRE tunnels on my central server, specifying the…
KlausD
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IP Binding Issue in using GRE Tunnel

I have a issue with tunneling and am having a hard time finding a solution. I have two servers, A: Host-Server being a sever with a single IP, and B: Main-Server being the server handling all our applications. I set up the GRE tunnel fine, but for…
NinjaDestroyer
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