Generic Routing Encapsulation (GRE) is a tunneling protocol, developed by Cisco.
Generic Routing Encapsulation (GRE) is a tunneling protocol, developed by Cisco.
Questions tagged [gre]
131 questions
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1 answer
GRE Tunnel Dies in 1 direction
I have built a GRE tunnel over tap0 interface between 2 Centos-7 hosts. I've done this via the following:
Host-A: 10.0.10.5
Host-B: 10.0.20.5
On host A:
ip tunnel add tap0 mode gre remote 10.0.20.5 local 10.0.10.5 ttl 255
ip link set tap0 up
ip…
johca
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- 3
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2 answers
Route incoming traffic through GRE tunnel
So I have a VPS and Dedi server both running Debian 9.9.
139.99.x.x: VPS
139.89.x.x: DEDI
The Dedi server runs a game server but can't be directly accessible, I want to route all traffic through my VPS first (obv to mask the IP of the game…
Martijn Kools
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- 2
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3 answers
GRE traffic not forwarded to local subnet
I have two debian machines in difference locations and want to enable routing between the two internal subnets via GRE.
My general routing is already working, meaning any internal machine directs traffic towards the two machines which are connected…
Dero
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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 --- natrelayhost --- grehostB
All hosts run Debian. To keep…
Rapsey
- 295
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- 10
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1 answer
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 monitoring interface. In normal operations, the…
r-diggz
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1 answer
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 between the left and right routers. I am clear to…
Woody Wu
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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 lineary with several hosts on the left running in…
Veniamin
- 853
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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 ping, Success.
create qdisc using following…
Shihab Pullissery
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2 answers
Packet loss in IpSec/GRE tunnel
This is my setup:
+--------------------+ +-------------------+ +--------------------+
| Router B a +-----+ Router+Firewall C | | b Router D |
| 10.10.10.1 ----------------------------------10.10.10.2 |
| …
Matthias Wuttke
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1 answer
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 with the preinstalled OpenVPN Debian 8 distro.…
Purgatory
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1 answer
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 successfully tested and implemented a mock-up in line…
Junior
- 1
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1 answer
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. Actually, the tunnel is already…
Дьяус
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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,
in my second, it have not DDoS, hosted in…
0
votes
3 answers
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) 192.168.11.111 via 10.0.33.50 dev tun2
On server B I binded…
Jason
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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=60a400,len=8260) from network failed: status = -1…
alireza m
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