Questions tagged [gre]
Generic Routing Encapsulation (GRE) is a tunneling protocol, developed by Cisco.
0
votes
0answers
47 views
How to exclude gre tunnel from going through OpenVPN connection by default?
I'm bit at a loss here as I don't know how to do this.
I have two servers connected via gre tunnel (A: 192.168.168.1, B: 192.168.168.2). Server B is running a TeamSpeak server which I connect to via ...
0
votes
0answers
56 views
Using iptables NAT to forward GRE tunnel
I have two hosts which need to have a GRE tunnel between them. In between the two I have a relay host which needs to perform NAT and forward the GRE traffic in either direction.
grehostA --- ...
0
votes
0answers
45 views
GRE(IPv6) over IPSec(IPv4) - How to convince a Fortigate 60D to accept IPv6 addresses for the “system” interface?
Folks,
for the life of me, I can't figure out how to convince a Fortigate 60D to accept IPv6 addresses as GRE Tunnel endpoints.
This is on a Fortigate 60D running FortiOS 6.0.3.
The network setup ...
0
votes
2answers
378 views
Allow GRE (IP protocol 47) over Linux router NAT for a subnet
I have network setup as shown below:
The VPN server running is windows 2012 server default VPN, which uses GRE protocol. I am able to have VPN connection to that remote vpn server, from my intranet ...
0
votes
1answer
62 views
ERSPAN to IP on Centos host with multi interfaces on the same subnet
I have an interesting configuration and would like some help getting it to work.
On a hardware network monitoring probe, i have 2 physical interfaces. mgmt is the management interface and mon1 is a ...
0
votes
0answers
38 views
Openvswitch does not forward transit GRE traffic.
Seems to be that openvswitch on my KVM host doesn't forward transit GRE packets.
I have switch acting as source of ERSPAN traffic, directly connected to the host. This traffic is just unidirectional ...
0
votes
1answer
219 views
Linux GRE Tunnel: Remote Address parameter
The Linux GRE tunnel as two parameters, local address and remote address. Suppose I have two routers, the left one is outside of a NAT and right one is inside NAT, then I want to create a GRE tunnel ...
0
votes
0answers
42 views
How can i move all the network traffic on the backend over the gre tunnel?
i have a gre tunnel with a frontend and a backend. I need to move all the backend traffic over the gre tunnel in order to reach all applications of the backend via the frontend IP.
Can you help me? ...
0
votes
1answer
96 views
GRE perfomance issue on Linux
I got a strange GRE perfomance issue.
The setup is shown bellow.
[host1] --- GRE over Eth 1G --- [linux router] --- Eth 10G --- [host2]
Iperf transfer rate host1>host2 reaches 950Mbps. It encreases ...
0
votes
0answers
166 views
Connecting IP GRE and EoGRE tunnel in the same linux host
Is there a way to forward the payload of a GRE traffic to a different EoGRE tunnel on the same Linux host ?
Host A (GRE (IP/GRE/IP)) <—> (GRE (IP/GRE/IP)) Host B (EoGRE(IP/Ethernet/GRE/IP) <...
0
votes
1answer
250 views
tc qdisc with GRE in openwrt
I'm trying to implement traffic control to GRE interface in an openwrt board.
For this i followed below steps,
Create GRE interface named gre1 in both tunnel end devices.
Tested reachability with ...
1
vote
1answer
481 views
How to setup a GRE 3 host mesh without loops and forwards with OpenVSwitch?
I'm setting up a quite simple 3 host Proxmox (Debian) HA cluster. All VMs should be in the same subnet and when one fails over to another host inside the VM no reconfiguration should be required and ...
0
votes
1answer
988 views
Packet loss in IpSec/GRE tunnel
This is my setup:
+--------------------+ +-------------------+ +--------------------+
| Router B a +-----+ Router+Firewall C | | b Router D |
| 10.10.10.1 -----------...
0
votes
1answer
675 views
GRE Tunneling not working
i've been looking everywhere for a solution to this but have found really nothing. I was wondering if it is possible to forward ports such as 80 through an OpenVPN connection? I am using an OVH VPS ...
2
votes
1answer
701 views
Get IP over DHCP for GRE-tunnel
I need to create a GRE tunnel from a client to a server. This is my setup.
Setup:
________________________________ _________________________________ ______________________________
|Server ...
2
votes
1answer
814 views
Bonding over OpenVPN, for fault tolerance
I have two OpenVPN server, and two machines connecting to them.
Server 1 openvpn address: 10.158.1.1
Server 2 openvpn address: 10.158.2.1
Machine 1 has address 10.158.1.11 on server 1, 10.158.2.11 ...
0
votes
1answer
857 views
iptables SNAT not working for GRE packets
I am trying to apply SNAT to a PPTP client. The TCP/1723 packets are being SNATed properly but not the GRE ones. Can anyone spot what's wrong?
I have the following iptables configuration:
$ sudo ...
1
vote
1answer
172 views
Public to Public IP GRE
I've managed to setup a GRE tunnel between two servers using BuyVM's very great guide (also used a guide via ServerFault)
It simply works. I can ping internally
So. To get into perspective:
A = 1.1....
0
votes
1answer
372 views
Nat over GRE using IPsec VPN tunnel
I’m working on implementing VPN tunnel IPSec GRE from Natted Linux box with Ubuntu.
I have found a very useful article, related to IPSec-GRE tunnel behind NAT, made with Cisco routers. I have ...
0
votes
1answer
559 views
L2TPv3 tunnel private IPs not working
I'm trying to setup L2TPv3 tunnel between 2 servers - CentOS 7 and Ubuntu 16
On CentOS 7 end I have the following:
ip l2tp add tunnel tunnel_id 6000 peer_tunnel_id 5000 encap udp local LOCAL_IP ...
0
votes
1answer
2k views
IPSEC over GRE tunnel on PFSENSE
I have two PFsense routers xxx.xxx.xxx.28 and xxx.xxx.xxx.27 and local networks behind them 192.168.110.0/24 and 192.168.111.0/24. The point is to set up GRE tunnel with IPSEC between these networks. ...
0
votes
1answer
238 views
GRE With scaleway
i'm having some problem here to create a GRE tunneling,
it' theoretically simple, i have 2 clouds, one, with DDoS Protection,
and another, without that.
In my first cloud, it have DDoS, hosted in OVH, ...
1
vote
1answer
2k views
PPTP Passthrough Centos 7/Firewalld router to Windows Server
I have a Centos 7 server running firewalld to allow public services to access internal services on a separate VLAN (dual NICs). I imported a Windows VM but I do not know what rules I need to put in ...
2
votes
1answer
413 views
Virtualize using IPs under GRE Tunnel (or NAT?)
Well, this is the situation I am experiencing:
I've got a dedicated server from OVH, and a dedicated server from another company, since the maximum RAM for the OVH server (GAME category) is 64Gb of ...
1
vote
0answers
462 views
Proxmox NAT with GRE tunnel as outside interface
End goal (ASCII Diagram)
WAN->Router->Server->GRE Tunnel->VM network->VM #1, etc.
I should explain some things first.
I have a server running Proxmox (Debian 8.7 x64). It's ...
6
votes
1answer
1k views
GRE tunnel TTL number
Here is the setting on server A:
iface serverA_gre0 inet tunnel
address 172.24.0.85
mode gre
endpoint x.x.x.x
dstaddr 172.24.0.86
netmask 255.255.255.252
...
2
votes
0answers
170 views
Is there a load balancer that will terminate a GRE tunnel?
I have a network in which several site routers send portions of their traffic to an inspection device via GRE tunnel. I am beginning to exceed the capacity of the inspection device.
I could always ...
1
vote
1answer
232 views
Why am i receiving so many unsolicited GRE packets?
My (linux) server has some fairly simple iptables rules.
iptables -A INPUT -p icmp -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -m tcp -p tcp --dport ssh -j ...
0
votes
3answers
263 views
Gre tunnel routing Public IPs between two servers
I want to route public IPs from server A and use them on server B. I created the GRE tunnel and it works. I then setup a route on server A in the following way:
(public IP not actual IP) 192.168.11....
2
votes
1answer
2k views
MikroTik GRE over IPSec
I'm trying to establish a GRE over IPSec tunnel between two MikroTik devices. Everything seems to work yet when I sniff the WAN interface I can clearly see the GRE packets which theoretically I ...
0
votes
1answer
290 views
pptp gre in csf firewall
i have a senior problem. when i want to connecting a pptp over a tap adaptor or a pptp connection have get disconnected and get this errors on messages logs:
linux pptpd[20275]: GRE: read(fd=7,buffer=...
0
votes
1answer
428 views
GRE protocol type for Ethernet over GRE?
For a IP over GRE tunnel, as defined by the RFC 2784, the "protocol" field is filled with 0x0800 (defined as ETH_P_IP in the Linux kernel according to this source http://www.scs.stanford.edu/histar/...
0
votes
1answer
1k views
Reverse proxy for DoS / DDoS protection
after i search how to protect my website host server using GRE tunnels, some friends of this forum give me a tip to use Reverse Proxy that would be better.
But i don't found any guide on how to ...
2
votes
1answer
679 views
Linux GRE keep alive
What are possibilities in Linux kernel (?) to work with Cisco endpoint encorporating GRE keep-alives? We have GRE IPsec tunnel set up with another company. We would like to have backup tunnel which ...
2
votes
0answers
156 views
What could cause racoonctl to show a Phase2 count higher than the number of ports racoon is listening on?
In my setup I have some EC2 instances in different regions linked by GRE tunnels, using ISAKMP via racoon. This setup is inherited, so bear with me if I fumble with terminology.
Sometimes I get weird ...
0
votes
1answer
823 views
Load balancing between two (or more) GRE tunnels
I have a hosted service (think zScaler™) that is having me send my traffic to it via GRE tunnels. I am given two appliances and want to load balance my traffic between the two tunnels.
I could ...
1
vote
0answers
779 views
Ethernet over GRE bridging - Proxmox
I'm trying to install two proxmox on Online.net server's, and I just realized that their RPN feature doesn't work at all like the OVH vRacks.
Since I need the different VM's on both hypervisors to be ...
1
vote
0answers
123 views
Cisco 1941 EIGRP UP DOWN
We have two cisco routers 1841 and 1941. The 1841 keeps generating "holding time expired" and "interface goodbye recieved" about its neighbor the 1941. The VPN IPSec protocol seems to stay up. ...
0
votes
1answer
938 views
Amazon Linux - iptables NAT rules not matching GRE traffic
I'm trying to prototype something in AWS VPC/EC2, but I can't get my NAT rules to work. I have the following setup (all instances running the Amazon Linux AMI):
GRE Tunnel between instances 10.0.0.10 ...
1
vote
0answers
138 views
internet access for system over multiple hops of ipsec using GRE and OSPF
I have the following setup:
linux client @ 172.16.10.68
linux gateway @ 172.16.10.69, ipsec tunnel to aws box #1, gre tunnel
10.254.0.0/30
aws box #1, ipsec tunnel from linux gw, ipsec tunnel to ...
1
vote
1answer
279 views
GRE - overlay network
I am renting a set of dedicated servers, and they only have a single interface to internet.
However, for a lot of use cases, I would like my servers to communicate through a private IP network. For ...
1
vote
0answers
127 views
IP Tables forwarding tun0 over gre1 (OpenVPN)
I haven't found a very descriptive thread (and sorry if there is one in existence - in my several hours of searching I've found nothing to my specific situation).
My main issue here is getting my ...
0
votes
1answer
856 views
Iptables not routing GRE protocol
First things first, there might be a few English errors, considering it's not my native language. I'm having a problem with VPN(GRE protocol) passing through Iptables. I've done this at least a dozen ...
3
votes
1answer
304 views
Poor IPsec over GRE performances
I have set up an IPsec over GRE connection with a remote host, both are NetBSD 6.1 based. The "client" is connected to the Internet through a 400Mbps fiber
connection. The "server" is located on a ...
0
votes
1answer
1k views
https connection can't established behind a gre tunnel
I have a network topological graph like this:
Local box GateWay box
+---------------+ +--------------------------+
|192.168.1.200 | -> |192.168.1.2 10.2.10.2 |
+-------...
0
votes
1answer
355 views
Set up transparent GRE/VPN to redirect all traffic to an External datacenter
I need to setup an existing server with multiple IPs (from OVH) to send all the traffic (through VPN or GRE tunnel) to an external server that has only 1 Public IP.
I want to make it like every local ...
0
votes
2answers
4k views
How to route outbound traffic for a particular destination IP address to GRE Tunnel in CentOS?
Hello I am trying to configure a network like this network diagram :-
Well I have to create a GRE Tunnel at my alpha server and route some particular traffic to GRE Tunnel.I want to do the configs ...
0
votes
0answers
183 views
GRE Tunnel Collapsing in One Direction
This is a related question to another thread I posted.
I'm having an issue where my GRE tunnel is collapsing in one direction, but can be reopened by ping the other server using the GRE Interface.
I'...
3
votes
1answer
2k views
Multicraft: Port Forwarding through a GRE Tunnel
For the past week I've been attempting to protect a server from DOS attacks by utilizing a GRE tunnel from a VPS to a dedicated machine without much success.
Visual:
User --> VPS --> Dedicated ...
0
votes
1answer
146 views
Public IP not responding because routing table…?
Fixed with:
/etc/iproute2/rt_tables
1 tble_eth0
/etc/sysconfig/network-scripts/route-eth0
104.000.64.0/18 dev eth0 src 104.000.65.38 table tble_eth0
default via 104.000.64.1 dev eth0 src 104.000.65....
