Questions tagged [tunnel]

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Slow ARP Update using Windows and Linux Bridge

I have an issue with the ARP update if I switch between to networks. The diagram show my current network consisting of a Windows 10 PC (client) a switchable bridge (in the middle) and two linux PCs ...
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23 views

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 ...
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17 views

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 ...
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70 views

Tunnel keep-alive issue between Cisco and Mik 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 ...
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40 views

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 ...
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14 views

Create Public IP proxy which tunnels to Private IP over FortiClient VPN

I have a connection to a server that is accessible over private IP using the FortiClient VPN software. I'm not an admin & can't change any settings on the network, server, firewall, or VPN. I'd ...
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1answer
82 views

How to forward all traffic and IP addresses

I want to build a system that allows me to have "floating IPs". To do this, I want to have a single server with 5 IP addresses. It then relays that traffic to another machine (or more) ...
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175 views

Docker network bridge GRE tunnel

I am currently trying to setup a network docker bridge with a GRE tunnel. I have setup the GRE tunnel fine and the GRE tunnel is working, however, whenever I tried to use docker with it, it wouldn't ...
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77 views

Cannot Locate IPIP Tunnel With Specific Remote IP

I have a dedicated machine running on Ubuntu 20.04 with kernel 5.4.0-52-generic. I use something called Docker Gen (running this configuration) to setup IPIP tunnels when a Docker container starts and ...
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1answer
55 views

Programmatically open a SSH tunnel in active session?

I'm aware that after starting a new SSH session I can open the SSH shell to start a new tunnel (Enter then ~ and finally C): >ssh -L 9000:localhost:9000 Forwarding port. Is there a way to do it in ...
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45 views

IPSec Phase 2 Configuration For Translated Subnets?

I have two networks with the 10.0.0.0/8 subnet I'm trying to connect via IPSec tunnels. I have the phase 1 configurations working but am a bit stuck on the phase 2 configurations. Each firewall used ...
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Is it possible to send traffic through the VPN tunnel to the VPN gateway itself?

I have a WAN interface X and a web server Y behind NAT, that is traffic to X:443 is being forwarded to Y:443. Web server is accessible from the internet without any problems. Then I have a site-to-...
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23 views

Setting up a special tunnel

I live in a country with serious difficulties in accessing the free internet. Many sites are filtered, the speed in resolving host names is slow, bringing up web sites takes time, and you feel how ...
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GRE Tunnel - Trasfer /30 subnet to remote KVM host

Tutorial used: click here Commands used both servers: Server 1 ip tunnel add gre1 mode gre remote 9.176.110.209 local 212.188.100.58 ttl 255 ip link set gre1 up ip route add 212.188.103.64/30 dev gre1 ...
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25 views

How to use tcpreplay to replay pcap traffic in my tunnel?

I want to use tcpreplay to replay pcap traffic in a tunnel. I have tried using tcprewrite to modify the IP and MAC belonging to the tunnel,but the traffic cannot be monitored at the other end of the ...
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1answer
90 views

How should I create an IPIP tunnel between 2 OpenVPN servers?

I have 2 CentOS 7 servers which both of them have OpenVPN installed on them . I want my clients on the first server to be able to connect to the OpenVPN server and then I want their network traffic to ...
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120 views

How can I accept IPIP connection in CentOS 7?

Guys I have a server with Mikrotik Router OS installed on it and there are some PPTP users using that server as a VPN server . What I want to do is to create an IPIP tunnel between this Mikrotik ...
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31 views

SSH Tunnel Session

Where can I see the active ssh tunnel sessions? I've already tried who and it's only showing root and not the other users using tunnel the users have /bin/false
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1answer
48 views

Connecting with https to a server application on GCE VM through ngrok tunnel

I am observing a strange behaviour with ngrok on a GCE VM. I fire up a 'preemptible' VM instance with static external ip, and start ngrok on it normally. I get the URL that maps incoming https request ...
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199 views

SSH tunnel without sshd in the middle

I have 3 machines A, B and C. I can ssh from B to A and also from B to C. B will not accept any incoming connections. There is no direct connection between A and C possible. Is there a way to ssh from ...
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10 views

Packages from tunnel don't make it to application level

I have a tunnel to a partener created using racoon. In the last couple of weeks I had serious data losses through this tunnel (but not from any other sources). The start of these data losses coincide ...
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1answer
140 views

Tunnel Linux traffic to Windows

I have two servers. Windows and Linux. Let's say Linux has the IP 1.2.3.4 and Windows 5.6.7.8. I want all traffic to be forwarded to windows as a tunnel. If I connect with 1.2.3.4:329 I want to ...
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52 views

How to access a virtual server on a host from remote host

Support I have a host A with ip 9.21.118.35, in this host there exists a virtual server with ip 192.168.130.11 and virtual server expose port 31666. Then I want to connect to virtual server (192.168....
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141 views

Sending Traffic Back To Clients Directly From IPIP Endpoint Tunnel While Spoofing Source IP

I made a C program on Linux (Ubuntu 18.04) that forwards traffic to another server via IPIP. When the IPIP endpoint sends replies back, the program also sends back the data to the client after ...
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1answer
330 views

Unsupported address method 'v4tunnel'

I'm trying to create a tunnel to HE.net to get an IPv6 address on my (cloud) server. When I created the tunnel and put this in /etc/network/interfaces: auto he-ipv6 iface he-ipv6 inet6 v4tunnel ...
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1answer
178 views

Netmask for point to point ip address?

In a point to point tunnel, I was able to have the same IP twice. It looks like a bug, I think that might be related to some internal representation of the netmask. It can be reproduced with the steps ...
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723 views

VPN via middle/jump server

Here's the rough picture of what I'm trying to do: client -> |VPN| -> server A -> |VPN| -> server B -> Internet. Server A and Server B are both on public internet with public IPs, also ...
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1answer
2k views

Use IPv4 on IPv6-only machine (through SSH tunnel?)

Our non-IT company uses a IPv4-only webservice which only allows access from our (whitelisted) IPv4 ip. This ip is assigned to one of our VPSes (this VPS also has a IPv6 assigned to it). We usually ...
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1answer
183 views

How do corkscrew, proxytunnel and httptunnel set tunnels up?

I have been looking into utilities which enable tunneling (SSH or otherwise) through an HTTP proxy: corkscrew proxytunnel httptunnel I've not actually ever used any of them, though. It is not clear ...
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2answers
148 views

Connect two internal networks in one network

I have two servers A and B. Server A with device ens3 and address 10.1.0.171 and server B with device ens3 and address 10.1.0.253. I want to setup on server A and server B networks 10.2.0.0/24, up vm ...
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2answers
946 views

Linux lightweight tunnels

Linux now support lightweight tunnels https://lwn.net/Articles/650778/ which means tunnel configured on the routes (so no need to set up one interface by tunnel). But unfortunately I did not manage ...
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1answer
84 views

IPSec in IPSec with strongswan

I have server connected with remote LAN1 over IPSec tunnel. Now I want to setup second tunnel to LAN2 which is connected to router in LAN1, so I need to create Ipsec tunnel inside existing ipsec ...
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4k views

How can I route traffic over IPSec tunnel?

I have two sites: MAIN (local subnet 192.168.0.0/24, external IP: M.M.M.M) and CLIENT (10.0.0.0/24, external IP: C.C.C.C). I created an IPSec tunnel between the sites and both sites can ping computers ...
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1answer
623 views

Windows SSH Server - Disable Shell / Cmd access

I have enabled the SSH Server on Windows using the built-in feature. Since this server is only being used as a tunnel, I would like to disable any commands from being executed. On linux, it appears ...
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1answer
313 views

aws ec2: ipip tunnel between instances via public ip addresses

Can anyone kindly tell me that it's possible or not in the first place? Suppose: There are two ec2 instances In one aws account/vpc. In different subnets/available zones each other. Runnig on ...
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1answer
49 views

Use OpenVPN connection the execution of one program

On Debian, is it possible to run an OpenVPN connection such that it is only used for the execution for one program? In other words: Other programs use network as normal Only the one program that is ...
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1answer
63 views

Reverse SSH two times from C to B and from A to B to shh from A to C

My hosts: A - windows WSL (can not install ssh in Windows, only in WSL) B - ubuntu 16.04, with sudo C - redhat 7, without sudo or root Then access I have: I can access B from A I can access B from ...
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1answer
2k views

Share internet from Windows machine to a Linux machine through ssh

We have access to a secure linux infrastructure through a Windows machine. The linux infra has no access to internet, but the Windows machine has. On this windows machine, we have installed putty, ...
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30 views

If an echo from tunnel interface IP is successful but an echo from the tunnel interface source fails, is that an outage with ISP?

Trying to track down an outage. Our Cisco ASR has a tunnel configured as IP: 100.64.#.# Source: 192.#.#.# (Amazon DX block, this address is also configured as a loopback on another interface) ...
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1answer
244 views

How to get reverse tunnel IP

I created reverse tunnel from Server to Endpoint using command: ssh -R 127.0.0.1:4000:localhost:81 user@server.domain Tunnel was created on Endpoint side and it leads from Server port 4000 to ...
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4k views

Run openvpn inside docker and use as gateway for internet for other networked devices

I am trying to run tunnel all my network traffic on my LAN via an OpenVPN client running inside a docker container. My router and default gateway is running on 10.10.10.1 I have OpenVPN running on ...
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103 views

Tunneling on Linux through VPN on windows host for yum

I need to upgrade and install some yum packages on remote server without internet access that's only accessible with a VPN client on a Windows host. Once this VPN connection is established the Windows ...
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1answer
351 views

Configure L2TPv3 on Ubuntu using hostnames for peers instead of IP

Is it possible to configure L2TPv3 using ip l2tp commands on Ubuntu 18.04 but using hostnames for peers instead of static IP addresses ? If so can someone give me a hint on how to do this ?
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1answer
244 views

IPTABLES not blocking EoIP Tunnel

So I decided to play with EoIP Tunnels today on two VMs which I installed free trial RouterOS on them. I set rules on iptables on the hypervisor (which is Proxmox) that prevents any input to vms ...
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75 views

VPN PPTP server

I'm doing a VPN PPTP server on this standard, now I have the following packages: Client -> Server: Point-to-Point Tunnelling Protocol Length: 156 Message type: Control Message (1) Magic Cookie: ...
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169 views

Routing between OpenVPN subnets in tunnel modes

Hope someone can help me and understand what is wrong in my setup. I have installed OpenWrt Chaos Calmer 15.05 on m TP Link router. The router have the WAN connected and a WiFi and wired subnet on ...
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1answer
2k views

Wireguard VPN Outbound and Inbound

I am trying to setup a Wireguard tunnel so that A uses the IP of B for outbound and inbound traffic (like a proxy, not a std VPN config). Both boxes are Ubuntu 16.04. A is eth0, behind a router with ...
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1k views

VPN Tunnel - Crypto map policy error

Good day! GCP reports the following error: The peer gateway notifies: Proposal mismatch in CHILD SA (phase 2), Please look at peer logs. On the ASA 5505 side I'm getting: Map Policy not found for ...
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1answer
660 views

forward vpn server traffic to another server

I have set up 2 VPN servers in 2 different locations [ A:openvpn server(ubuntu) , B: PPTP Server-RouterOS Mikrotik ] What I want to do is to make A route all client traffic tthrough the pptp tunnel ...
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1answer
328 views

OpenVPN clients with same subnet connect to server

Is there any way at all to connect possibly hundreds of IOT devices that have the same LAN IP (192.168.1.1) to one OpenVPN server? The devices have openvpn client preinstalled. I've been told it's ...