Questions tagged [tunneling]

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AnyDesk TCP tunnelling port “closed” since Windows 10 2004

I connect to my company computer via AnyDesk. I have set up a TCP tunnel from local port 11111 to remote port 22, to have an SSH connection to the remote machine. This stopped working since I ...
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SSH tunnel to vnc server [closed]

I am following the documentation available here to connect to ssh tunnel to vnc server ssh -i ~/.ssh/ubuntu18.04 -L 5901:127.0.0.1:5901 -N -f -l tecmint 192.168.56.108 The operating system of my ...
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1answer
43 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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incomming connection from GRE tunnel is always in SYN_RECV state

I create a GRE tunnel according to this tutorial : https://community.hetzner.com/tutorials/linux-setup-gre-tunnel/ in base server (server A in tutorial ) i have BGP advertise . when i enable the ...
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1answer
26 views

Best way to link two systems [closed]

I am trying to link two Ubuntu 20.04 servers together Server One is a cloud server with its own dedicated IP with DDoS protection and a hardware firewall. Server Two is a much higher performance ...
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21 views

Forwarding Home Game-Server through GRE Tunnel | Can't ping remote GRE IPs

I am having trouble routing my game-servers through GRE. I do not receive a ping from either side when pinging them. I can ping the local GRE interface; however, I cannot ping the remote GRE interface....
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2answers
67 views

How can I setup a dual SSH tunnel so that two machines A and B behind firewalls ssh into a central sever such that A can VNC into B?

I need to connect via VNC from my machine A to another machine belonging to my friend B. Both of us have no way to open incoming ports - ISPs do not allow tunneling unless you buy a static IP based ...
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7 views

Ubuntu server 16.04 and OVS 2.5.5 Stretch VLAN across 2 sites

I am proof of concept for a client, the requirement are the following: Stretch across 2 site the ERP network (stretched VLAN), this is needed due to dated machinery that have to talk to a particular ...
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1answer
20 views

How to tunnel private adress based on etc/host record?

I have machine A (MacOS), and Server B in private network (ubuntu). In etc/host on B I have something like: 192.168.63.123 abc.abc.com 192.168.63.123 abc2.abc2.com 192.168.63.123 abc3.abc3.com I ...
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IPsec Tunnel : Multiple ipsec tunnel routing (Lynksys LRT214)

I have a problem to crate a comunication between two ipsec tunnel, both client can't ping each other. it seem to be a routing or policy issues. I dont know how to solve it. I hope that someone can ...
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93 views

ssh tunneling not working on Mac Os X

I have a mac host I want to use as a ssh server to access other computers on my LAN from a remote standpoint. For example, I want to access a web server (port 80) having address 192.168.1.4 on my LAN. ...
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196 views

Routing tun0 traffic through tun1 (double-hop VPN)

Goal: route all internet traffic from eth0 -> tun0 -> tun1 for double-hop VPN. Is the following routing table correct for that goal? $ ip route show: 0.0.0.0/1 via 10.8.1.1 dev tun1 default via 10....
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1answer
65 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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1answer
37 views

Install packages through a 2 ssh tunnels

I have the following scenario: Server_A : Host that needs to get packages installed Server_B : Host that it's used to connect to Server_A Server_C : Host that it's used to connect to Server_B ...
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23 views

Unable to change link-local address for tunnel with iproute2

I have a couple of HE sit tunnels on Ubuntu 18.04 box. Only first one works as expected and I suppose the reason is almost same link-local addresses (generated from same MAC). What I'm trying is to ...
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18 views

GRE Tunnelling Routing use other client IPS

I have setup GRE tunnel with centos server that works perfectly between two servers A master and B slave the second server B contains two ips X and Y the issue is that the provider of server B said ...
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1answer
81 views

Tunneling between two servers [closed]

There are two servers in this network The first server benefits from censored internet The second server uses uncensored internet The client can only connect to the first server and connect to the ...
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1answer
39 views

Connecting to another server through squid

I have 2 servers A and B, I don't have access to B normally, but I can access B through server A. I want my http requests to be proxied through server B. If I set up squid on server B, I can't access ...
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52 views

ACK packet lost in GRE tunnel for IPv6 in IPv4

At home (79.1.1.156), my ISP doesn’t provide IPv6 so I’m connecting my server to an external server (95.1.1.126) that has IPv6 access via a GRE tunnel, with this simple setup: ip tunnel add gretun ...
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2answers
503 views

Linux GRE - ip tunnel vs ip link

Can someone please explain the difference between linux ip tunnel and ip link command when it comes to configuring tunnels (such as GRE, IPIP, or VXLAN)? I can see that I can configure a GRE tunnel, ...
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57 views

How to connect to OpenVPN client on my own VPN Server [ Proxy two times ]

I have written a proxy app with Go. Here is how it works: At first My app is listening on a port for UDP connections. When it receives a new connection, it creates a tun interface pointing to a NAT ...
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71 views

tun/tap not receiving data

I have the following code to create a tun virtual device with python. in the other side i have android that forwards the entire traffic over UDP link and i server forward it to tun. but no data is ...
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1answer
374 views

tun/tap works on incoming or outgoing packet?

When we create a tun virtual interface we use read and write to read and write packets from/into network stack. My question is when we use .read, we are actually reading outgoing packets (the packets ...
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1answer
96 views

what is difference between simple TUN and VPNs like PPTP and L2TP

In respect of VPNs and tunneling, as far as i know, TUN is a virtual interface works on network Layer 3 (IP packets), and is nothing more than a simple more likely UDP socket link in practice (I think)...
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2answers
191 views

How to create SSH tunnels

is it possible to achieve the following scenarios by using the SSH tunnels? My workstation --> jump server --> app server --> final resource (port 443) My workstation --> app server --> final ...
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1answer
119 views

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....
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39 views

Understand linux bridge tunneling configuration

I have a VPN software that creates a tap device connected to a bridge: $ brctl show vpnbr bridge name bridge id STP enabled interfaces vpnbr 8000.6630fabc3f2b yes tnl-2c5a50e $ ...
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188 views

Creating a vpn tunnel over grpc

I have two different private network . I need to create server client architecture like vpn where the client is on one network and server is in other network. I need to have bi-direction gRPC ...
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2answers
2k views

How can I use Apache as a reverse proxy for https?

My company uses a CMS system hosted in the cloud. We want to create internally DNS-aliases to make it easier for developers to remember. Reading the documentation for mod_proxy_connect I do think it ...
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1answer
1k views

Failed to connect to host with RKE

I have the following cluster.yml file: nodes: - address: 172.16.20.22 user: rke role: - controlplane - etcd - worker When executing rke up, I get the ...
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2answers
142 views

dedicated tunnel between two data center?

I sometimes hear the word about dedicated tunnel between two data centers. Say there is dedicated tunnel b/w DC1 and DC2 . DC1-> DC1 ISP -------- Internet ------ >DC2 ISP --------> DC2 My ...
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2answers
4k views

OpenVPN persist-tun option - what's the point?

According the OpenVPN 2 Cookbook: The persist-tun and persist-key options are used to ensure that the connection comes back up automatically if the underlying network is disrupted. These ...
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1answer
416 views

How to create a gretap tunnel between two AWS EC2 instances?

To create a tunnel between two machines connected to the same network, I can run the following commands: From host A: sudo ip link add gretap1 type gretap local HOST_A_IP remote HOST_B_IP sudo ip ...
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1answer
427 views

Tuning network interface for TCP over TCP in Linux

I'm porting a legacy embedded application to Linux. This application communicates with a remote server over a TCP connection using a proprietary protocol. In addition to the application specific ...
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1answer
69 views

Is it possible to create iface teaming/bonding over tunnel devices?

I have several physical NICs on one server which should be able to access peer server's physical NICs. I have ip-tunnel devices (currently set as GRE) between each pair of NICs. I'd like to team/bond ...
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1answer
549 views

Administration of multiple sites (tunneling) - MikroTik & NAT

I would like to ask you for your opinion. I need to find a secure way how to manage small remote sites where I have RBs. We have HQ, where is Kerio Control as a FW and a lot of small sites with ...
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2answers
4k views

Curl through intermediate server

I need to send PUT/GET/POST request with curl through a custom port from client1 to server2. However, server2 only accepts these requests from server1, and denies client1 if connected directly. What ...
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72 views

SSH tunnel for serving web sites from localhost

This is more question... When I do like this... I am able to serve my site to external IP of my VPS... ssh -L 8080:localhost:80 username@server.com How secure and is it okay to serve websites ...
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1answer
377 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 ...
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2answers
630 views

SSH tunneling shows no response.

I am trying to ssh tunnel into this CTF box and this is the command I am using ssh -L 2020:127.0.0.1:5901 user@196.168.88.47 and to connect to the 2020 socket I use ssh -p 2020 root@127.0.0.1 ...
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1answer
466 views

Android OpenVPN disconnects the SSH tunnel

I want to tunnel my OpenVPN traffic through an SSH tunnel. I have An OpenVPN server behind a router running on port 4321 SSH server on the same machine on port 22 Router forwards ports to the server'...
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1answer
1k views

Access to IP Camera using VPN to Webserver for Public IP

I'm tasked with setting up access to IP cameras in remote construction sites in the Philippines. The internet access is provided via Ubiquiti Power Beam from the only supplier available in the area. ...
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1answer
846 views

Route one or multiple Public IPs via VTI over IPSec site-to-site tunnel

I successfully created VTI over IPSec Site-to-Site tunnel between my home router (UBNT Edgerouter) and dedicated server (Ubuntu 16.04) at OVH. I can route internal private networks of each sides via ...
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0answers
272 views

Linux routing issues with tun0

I am attempting to get hanstunnel (IP over ICMP) to work on my VPS I have: Ubuntu 16 VPS with: ens3 a.b.c.d (external ip) tun0 10.0.0.1 Ubuntu 16 VirtualBox with: enp0s3 192.168.1.1 tun0 10.0.0....
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1answer
309 views

IPv4 over IPv6 tunnel for HughesNet user

I have a client who wants to access cameras remotely via a HughesNET Internet connection. HughesNET using carrier grade NATting (CGN) for IPv4 and so does not provide their customers with publicly ...
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1answer
1k 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 ...
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1answer
300 views

OpenVPN connect to other servers in LAN

I have installed OpenVPN on a Ubuntu server and I have OpenVPN -client on my PC. I can connect from the client to the server with no problem (still have the same ip). How can I set up connection to ...
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1answer
168 views

VXLAN format details

Learning about VXLAN I found in a document: ...VTEP1 then adds a VXLAN header that contains the VNI to the Ethernet frame, encapsulates the frame in a Layer 3 UDP packet, and routes the packet ...
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1answer
809 views

Dell iDrac with SSH Tunneling : administratively prohibited open failed

I've a problem to access to my iDrac interface over SSH. I want access to my iDrac WebUI by SSH Tunneling but I've this error : channel 6: open failed: administratively prohibited: open failed My ...
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1answer
953 views

IPSec Tunneling Between 3 Different Sites

I need some help to shed me some lights over an IPsec tunneling. Here I will explain on my current setup. Site A <-------IPSEC------> Site B (HUB) <------IPSEC------> Site C 10.1.1.1/24 ...

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