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2answers
626 views

Tunnel SSH from A->B->C [closed]

I'm looking to setup a tunnel using PuTTY on Windows. Ideally I'd SSH directly from A->C, however, I can't from the network I'm on. I can, however connected from A->B->C. C is running a vncserver, ...
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1answer
3k views

What's the difference between GRE and IPIP tunnel?

And which one is better for connecting two linux machines?
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3answers
392 views

“Tunnel” from one network to another

I'm sure the answer to this would be available on Google but I don't really know what I'm Google-ing for. Situation; We have two networks; our own internal network (192.168.0.[0-255]) and our '...
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3answers
809 views

IPv6-only client to IPv6/IPv4 dual stack server tunnel?

I have a IPv6-only client and a IPv6/IPv4 dual-stack server. The client can connect to the server via IPv6. I want to set up a tunnel on the server so the client can access IPv4 resources through the ...
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3answers
9k views

How do I SSH tunnel using PuTTY or SecureCRT through gateway/proxy to development server?

We have some unix boxes setup in a way that to get to the development box via ssh, you have to ssh into a 'user@jumpoff' box first. There is no direct connection allowed on 'dev' via ssh from anywhere ...
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1answer
171 views

My sysadmin is on vacation, Help!

I wanted to trouble shoot a certain issue on the server, but I could not connect my debugger since the person who maintains the firewall is off on a vacation. I dont want to mess with his settings. He ...
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2answers
2k views

Https tunnel for carrying TCP and UDP packets

I had an issue with running Openvpn over UDP in my college network. The firewall was dropping UDP connections. As http and https were working fine and assuming that the firewall was inspecting packet ...
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3answers
284 views

Hash function in shell that could be used for an ssh port from (say) hwaddr of eth0

I have a growing number of remote machines that ssh home and setup a connection to allow subsequent access via tunnel so I can get into them for maintenance. Currently, I must manually configure ...
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1answer
1k views

Why are my reverse SSH tunnels suddenly dying?

I have had persistent tunnels from all my client computers to my servers in place for about a year now. I've not updated my server or changed any configuration files--as far as I remember--for several ...
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1answer
2k views

Vpn tunnel to Amazon VPC with pfsense

I'm trying to create an ipsec tunnel between my office and our Amazon VPC. However I have never used ipsec before so I'm at lost. The gateway/firewall is running pfsense 2.1.3-RELEASE (i386) on ...
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1answer
4k views

RDP from 2008 R2 through a tunnel fails

I'm trying to RDP from a Win7 to a 2008 R2 machine through a tunnel (think SSH, but not exactly). It fails and the following is in the 2008 R2 (destination) event log: System Event Log, LsaSrv ...
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2answers
4k views

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 ...
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1answer
185 views

IPv6 (aiccu tunneled) server consistently resolves addresses to its own IPv6 address

I have a Fedora 10 server using an IPv6 tunnel broker (sixxs). One of the nagging things I have noticed is that using any common utilities like "wget" domains resolve to the real IPv4 destination ...
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3answers
350 views

Another SSH Tunneling question

Here's the Diagram Server A ----> Server B <----- Laptop So basically Server A and Laptop can connect to Server B directly but you can't establish a connection from Server A to Laptop directly, ...
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3answers
2k views

Firewalls that block RDP over port 443

I need people to reach my servers over SSH and RDP. Both ports are blocked outbound at many companies, especially the large ones. However, I also suspect that in 90% of companies there is nothing to ...
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4answers
971 views

Inexpensive and Open replacement for Cisco Tunnel-based EasyVPN with Cisco VPN 3000 Series

I have a scenario where i have to establish peer-to-peer preshared key based VPN to a vendor. This vendor uses Cisco EasyVPN with Cisco VPN 3000 as access concentrator. I check the compatibility of ...
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1answer
135 views

Route all Ipv4 traffic over a 6in4 tunnel using RouterOS 6.x

Would it be possible to route all IPv4 traffic over an IPv6 tunnel? Let me elaborate, let's say I establish a tunnelbroker (HE) 6in4 tunnel, using IPv4 (duh!), but then I want to relay all my IPv4 ...
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1answer
139 views

OpenVPN: Traffic Redirection not Working

tl;dr (after hours of debugging with @krisFR): At least under Debian 8, never use virtual interfaces (eth0:1) for OpenVPN, instead apply the new debian iproute2 methods (manual approach) described ...
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1answer
441 views

Ip-in-Ip tunnel not working — Packets not being decapsulated

I am trying to forward packets from HostA to HostB using ip-in-ip tunneling. While packets are reaching their destination, they are not being decapsulated by the receiving host, and thus being dropped ...
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1answer
295 views

How can I bridge a VM to a remote network?

I have a system running QEMU/KVM (via libvirt). One of its VMs needs to have a presence on a subnet that is not local to the VM host. I have a Linux system on the remote subnet. Is there a way to ...
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1answer
906 views

Using a reverse tunnel to access a firewall-ed web server serving HTTPS

I have a device ("A) on my network that only serves content via HTTPS, it's not accessible as its behind my router/firewall. I have another machine ("B"), elsewhere on the internet (fake IP of 44.44....
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1answer
3k views

Routing default gateway for 2nd vlan over a tunnel (linux/tinc)

Fixed: It turned out to be a combo of what BatchyX said (missing the 172.16.101.0/24 route on the remote end), and tinc on the remote side failing to run a -up script (the script wasn't executable). ...
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1answer
815 views

Ssh socks server doesn't work [closed]

I want setup socks server on my localhost which forward all http traffic on my remote server for bypass firewall rules at my work net. And so I start it as usually sudo ssh -C2qTnN -D localhost:8080 -...
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1answer
113 views

Secure tunneling options between datacenters

My setup is main website server in one datacenter and mirrors in multiple other datacenters. I'd like to know what are my options to transfer traffic secure and stable between servers? Ssh tunneling ...
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1answer
102 views

Bizarre client IP switch-up on VPN

Let A.B.C.D be the public IP of my VPN server. Let W.X.Y.Z be the IP of the client before it connects to the VPN. My VPN server's IP address on the LAN in 10.8.0.1, and the client is 10.8.0.6. I ...
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2answers
5k views

SSH Tunnel slow

I just moved halfway across the globe and am having a strange connection issue. I have a 4 Mbps dsl connection, can successfully ssh into my server, and setup a tunnel. I use PuTTY (on my desktop - ...
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1answer
1k views

Forward all traffic through an ssh tunnel

I hope someone can follow this and I'll explain as best I can. I'm trying to forward all traffic from port 6999 on x.x.x.224, through an ssh tunnel, and onto port 7000 on x.x.x.218. Here is some ...
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2answers
463 views

Setting up local IP based filtering with OpenSSH on Ubuntu

Greetings, the server admin for our company suddenly left, and left the rest of us IT folk somewhat clueless about Linux and setting up servers and such. The setup is as follows: Our local server, ...
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2answers
2k views

MySQL Workbench HTTP tunnel

Is there way in MySQL Workbench to connect to a database via HTTP Tunnel? I've used HTTP tunnel for a while with Navicat and I would like to connect on same way to a remote databases with MySQL ...
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2answers
162 views

Secure, automatic tunnelling dæmon on Linux server?

I've been looking for software to do this for a little while but seem to find only pages that talk about projects that never materialized, or are not capable of running on a Linux system. Does anyone ...
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2answers
2k views

SSH over SSH Tunnel

I have seen this question: http://serverfault.com/questions/33283/how-to-setup-ssh-tunnel-to-forward-ssh but I'm having difficulties because of OS barriers. I have someone sitting on an XP laptop ...
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2answers
2k views

Is there an encrypted udp based tunnel that doesn't need a tun/tap device?

I am looking for a "application tunneling" solution that behaves a similar to an ssl or ssh tunnel but over UDP. One the client end, OpenVPN provides an network interface. I want the client end to ...
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2answers
3k views

Route specific HTTP requests through pfSense OpenVPN

to start, I have very little knowledge on routes, iptables, etc. That said, here's what I'm trying to accomplish and where I think I'm stumped: Problem: We have an external website which we recently ...
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1answer
1k views

Source nating into GRE tunnel

On a Linux box, I have create a GRE tunnel called gre1 172.17.1 -> 172.17.2. The Linux box IP is 10.10.100.100, the end point IP is 10.10.101.101. I am trying to do a source NAT (NOT destination NAT) ...
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2answers
1k views

Split Tunnel VPN using incorrect Tunnel

Our company has a handful of field offices that have recently been setup with a regular internet connection after we removed the T1 and router that connected them directly to our network. Now, when ...
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1answer
220 views

How to use same MPLS Traffic Engineering tunnel for ipv4 and ipv6

I have MPLS TE configured and working, but it is currently using IPV4 and I needed to include IPV6. My current tunnel configuration is the following: interface Tunnel1 ip unnumbered Loopback0 ipv6 ...
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1answer
4k views

Trouble with site-to-site OpenVPN & pfSense not passing traffic

I'm trying to get an OpenVPN tunnel going on pfSense 1.2.3-RELEASE running on embedded routers. I have a local LAN 10.34.43.0/254. The remote LAN is 10.200.1.0/24. The local pfSense is configured as ...
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1answer
350 views

IP Tunneling for SMTP server on Windows 2008?

I have a Windows 2008 server that is running an SMTP server. The server has a public IP Address. I have 2 other windows servers, not in the same network, that are used for hosting client applications. ...
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1answer
114 views

Am I obliged to use ipv6 tunnel services if I want to be able to use it?

I was looking for configuring Slackware to use ipv6 but all instruction I found speak about using an ipv6 tunnel that encapsulate ipv6 request into ipv4 packet and send them to an external router that ...
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1answer
805 views

VPN, Tunneling to hide 'real IP' through my proxy server while showing the client IP on 'real' server side

I would like to hide my 'main server' behind the load balancer, call it 'proxy server' Although I use some closed-source software on 'main server' and it needs the client IP address to operate well. ...
1
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1answer
797 views

Connect with sftp client to server that can be accessed only through other server

I am new to this forum and to this kind of stuff so don't judge me hard: I would like to connect with: sftp client (Bitise Tunneler) and nxClient (NOMACHINE) to the server A through other server B. ...
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1answer
2k views

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 ...
1
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1answer
459 views

munin monitor ssh tunnel traffic stats?

Attempting to generate a traffic graph to monitor tunnel traffic between two vps'es. two servers: 111.111.111.111 & 222.222.222.222 111 is an app server, 222 is a db server. Proper iptables ...
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2answers
848 views

SSH option AllowTcpForwarding is bypassable?

I understand this is used to prevent users from using the server as a proxy. But if the users can use curl/wget, doesn't that mean it's essentially bypassable? The manual page regarding SSH also said ...
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1answer
488 views

Routing telnet/23 connection thru double SSH tunnel (SSH proxy server)

I have a contractor is using a Windows PC that is outside the corporate network. However, we allow connections via the firewall to certain hosts/ports. Telnet/23 from the contractor's PC to a ...
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1answer
321 views

Tunelling over HTTP

I have a network at work that is locked behind a firewall and Internet connection is available only by using a proxy server. At work, I can connect to databases that are distributed across the network....
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1answer
593 views

VMWare fusion NAT + host tunnel; access from vm

I'm having trouble accessing a port on my OSX host from a vm. I'm using NAT in VMware fusion. In my (OSX host) hosts file, I have the ip address for vmnet8 mapped to 'mac'. From my vm, I can 'ssh ...
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2answers
310 views

Security concerns of having IPv6 (tunneling) enabled in network computers

Are there any security concerns having IPv6 and Teredo tunneling enabled in Win Vista/7? AFAIK, using Teredo basically allows bypassing of the firewall, as the firewall cannot really filter the ...
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1answer
758 views

GRE and IPSec Tunnel on the same interface

i have one route cisco 2800 series with a GRE+IPSec vpn tunnel configured. I need to create a new tunnel, but now this is a IPSec tunnel. What i want to know is that is possible to configure different ...
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1answer
652 views

GRE tunnel between a Cisco router and a snapgear firewall

Has anyone here ever setup a GRE tunnel between a snapgear firewall and Cisco Router? The Snapgear manual implies that it can be done, but doesn't give any examples. What is confusing me is that a ...