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1answer
293 views

How to troubleshoot GRE tunnel issues?

I commonly run into issues where a GRE tunnel (CentOS server to server, not router based) works and pings fine from both ends but the IP / Range being tunneled does not function. This almost always ...
0
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1answer
543 views

VPN laptop as proxy gateway for Intranet computers truss bridge/bypass

I have a Windows 7 Enterprise VPN laptop to access my client's VPN network. During VPN session the laptop can not accept any request from my Intranet even if I open any door using Windows Firewall ...
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1answer
524 views

Managing multiple servers behind a firewall with SSH reverse tunnel

I have 10 Ubuntu servers in different locations, behind a firewall each (local_server_1 to 10). All those servers are authorized to SSH into my public server (lets call it master) using ssh keys (in ...
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1answer
444 views

tunneling layer 2 ssh

Ok, I'm trying to break my previous question down into parts: This is my reference: https://help.ubuntu.com/community/SSH_VPN tunneling ubuntu -> debian 1. ssh -i green.pem root@$HOST echo 1 | ...
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2answers
938 views

Cannot run OpenVPN on port 53 (DNS Stops Working)

So I'm trying to get OpenVPN to work on port 53 - sadly this isn't working. I used IP tables to map port 53 to port 1194 (standard OpenVPN port) Here's what I run to do this: iptables -t nat -A ...
2
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1answer
336 views

Redirect SSH traffic through GRE tunnel

I'm trying to redirect all local connections with destination matchs port 22 to specified tunnel using iptables MARK, but, something is going wrong. 1.1.1.1 my public address 2.2.2.2 tunnel public ...
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2answers
1k views

Set up a 6in4 tunnel server

I'd like to set up an IPv6-in-IPv4 SIT tunnel server. I've combed through the Ubuntu IPv6 wiki page but everything is geared towards connecting to a tunnel as a client, rather than hosting one. I'd ...
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1answer
251 views

ssh tunnel and rdesktop in one line

To access a windows machine remotely I have to tunnel through a ubuntu server of mine. To setup the tunnel I have ssh -l root -C -L 9999:windowsmachine:23389 myserver Then I have to open another ...
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0answers
377 views

Using TomatoUSB and OpenVPN to tunnel IPv6 traffic

Assume the following scenario regarding the current IPv4/OpenVPN setup: Central Site with a /64 IPv6 (10.0.0.1) | | OpenVPN Server A OpenVPN Server B ...
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1answer
1k views

How to force certain traffic through GRE tunnel?

Here's what I do. Server (public internet is 222.x.x.x): echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf sysctl -p iptunnel add gre1 mode gre local 222.x.x.x remote 115.x.x.x ttl 255 ...
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1answer
1k views

Routing all data through an VPN tunnel with ppp

I'm trying to create a VPN tunnel that forwards all data from the local machine to the VPN server. I'm using ppp-2.4.5 for this with the following configuration: pty "pptp <VPNServer> ...
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0answers
126 views

How well supported is reverse ssh tunelling - wireless modems?

Does anyone know if GPRS cell modem providers univerally allow reverse SSH tunnels to be established? I'm looking for a solution to reliably allow SSH connections to systems on wireless modems that ...
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4answers
419 views

Tunnel between windows through linux server for sql server, possible?

One in a while I need to check some data in a MS SQL Server in another location. As for now this requires making database backup, moving it to another server so I can download the .bak file and ...
11
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1answer
7k views

ssh tunnel - bind: Cannot assign requested address

Trying to create a socks (-D) ssh tunnel - Linux box to Linux box (both centos): sshd running on remote side ok. From local machine we do / see this: ssh -D 1080 user@8.8.8.8. user@8.8.8.8's ...
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votes
3answers
542 views

Use server's IP via SSH tunnel

Firslty my setup is an Ubuntu laptop and an Ubuntu server. I have a program on my local laptop which needs to access a certain web-service, (lets call it http://someserver.com/someservice123). Now ...
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2answers
2k views

Replace DNS on Openvpn client without redirect-gateway

I am trying to push DNS to the client with OpenVPN server with config: push "dhcp-option DNS 192.168.x.x" It is working well, but what I really need is that during the VPN connection I do not ...
0
votes
1answer
294 views

Operation not permitted on ping6 after mip6d establishes MIPv6 tunnel

I'm very much out of ideas here: I run mobile IPv6 on Ubuntu oneiric, with a simple fixed-address setup. mip6d establishes a tunnel, but as soon as the tunnel establishes I lose all network ...
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2answers
2k views

Tunneling a public IP to a remote machine

I have a Linux server A with a block of 5 public IP addresses, 8.8.8.122/29. Currently, 8.8.8.122 is assigned to eth0, and 8.8.8.123 is assigned to eth0:1. I have another Linux machine B in a remote ...
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2answers
1k views

SSH tunnel doesn't work

I am trying to use my server as a "proxy" with ssh. However, setting up tunneling with ssh -D localhost:8000 user@myserver does not work. I tested this on various machines with ssh and putty - It ...
2
votes
1answer
736 views

Tunnel only one program (UDP & TCP) through another server

I have a windows machine at home and a server with debian installed. I want to tunnel the UDP traffic from one (any only this) program on my windows machine through my server. For tcp traffic this ...
0
votes
1answer
715 views

Which software could I use to setup a 4in6 IP tunnel (RFC 2473) on GNU/Linux

Here is my problem. I have a server A that has two IP addresses. One public IPv4 and one IPv6. Server B has only one IPv6 address. I want to host most of my services on server B (because I have more ...
0
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1answer
754 views

openvpn tunnel- tunnel is up but issues with routing

I am having trouble with a site to site tunnel. Both routers are centos based routers. Router A is the server, and router B is the client. The VPN tunnel is established. From router B, I can ping ...
1
vote
1answer
310 views

Difference between site-to-site and client-to-site configuration on openVPN server

I am trying to setup a site to site VPN tunnel using openVPN. The server currently is setup to accept client to site connections. When configuring a site to site tunnel (as opposed to the client to ...
1
vote
1answer
591 views

How do I know if an openVPN tunnel is established?

How do you know if a Site to site VPN tunnel is established in OpenVPN? Apart from pinging the other side, is there a command or something that shows the status of the tunnel? I am using centos on ...
2
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0answers
155 views

Dynamic VPN tunneling technologies

Ok, so I'm asking a more specific question this time. I'm writing a paper about Cisco's DMVPN and one of the tasks I have is to make the analysis of available network solutions which use dynamic VPN ...
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1answer
59 views

Dynamic tunneling technologies [closed]

Are there any other technologies like Cisco DMVPN that use dynamic tunneling in layer 3 networks?
2
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1answer
1k views

Tunnel apt traffic from private network through public to the internet

I've got 4 Servers under the following config: Servers 1 and 3(Web Server, Mail server respectivelly): NIC1: Public Network, Connected to the Internet NIC2: Private Network, Communication between ...
2
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0answers
339 views

Forward IP packets to tunnel device

I have created an tunnel device using ip tuntap add dev tun0 mode tun user 0 group 0 I then assign it an ip address 192.168.0.1/22 ifconfig tun0 192.168.0.1 netmask 255.255.252.0 On my ...
1
vote
1answer
146 views

Configure subversion to start SSH tunnel automatically for HTTP-only SVN server

We have an SVN server accessible with HTTP (and only HTTP) running on a firewalled port on our development system: dev $ svn checkout http://localhost:1234/proj/trunk On my workstation, I created a ...
1
vote
1answer
3k views

How do i route TCP connections via TOR? [closed]

I was reading about torchat which is essentially an anonymous chat program. It sounded cool so i wanted to experiment with making my own. First i wrote a test to grab a webpage using Http. Sicne .NET ...
1
vote
2answers
906 views

Connection refused in ssh tunnel to apache forward proxy setup

I am trying to setup a private forward proxy in a small server. I mean to use it during a conference to tunnel my internet access through an ssh tunnel to the proxy server. So I created a virtual ...
2
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2answers
2k views

Correct options for keeping open a reverse SSH-tunnel using autossh

I have a set-up with a LDAP-sever (ldapserver) behind a strict firewall, and a webapplication running on a sever (appserver) outside that firewall that needs to authenticate using that LDAP-sever. I ...
0
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1answer
176 views

Access internet through a tunnel

I have created a VPN tunnel between by system and my server. My server is whitelisted with another server. So while in development phase I want the request originating from my system to go to the ...
1
vote
1answer
958 views

Configuring ipv6 over radvd using sixxs, routing not working

So this morning, I have been trying to configure IPv6 upon my network using the guide I found on reddit (of all places) at http://ipv6friday.org/blog/2012/06/ipv6-enabling-training/. Now at first ...
3
votes
1answer
585 views

selective routing through a VPN tunnel

The problem: after establishing an IPsec VPN tunnel all traffic is routed to the remote endpoint, while I only need to route the packets destined to that internal network and still be able to access ...
1
vote
1answer
1k views

stunnel version 4.53 says SSL server needs a certificate on Windows 7

I have been using stunnel previous versions just fine. It didn't apparently have the feature of a certificate in SSL server mode. That's alright but not necessary for us as we're simply running a ...
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2answers
95 views

Encrypted off-site data storage

My business has a rather unique problem. We work in China and we want to implement a file server paradigm which does not store any files locally, but rather in a server overseas. Applications would be ...
0
votes
2answers
69 views

Secure every connection between endpoints

Sometimes one has to work with software that hasn't built in security-features for non-local connections. In fact, some client-libraries are sending credentials in clear text over the wire. On the ...
1
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0answers
564 views

why ping6 fails if tcpdump shows ICMP6 request/reply traffic?

I'm having a very strange problem with IPv6 pings on OpenWRT (fon-ng firmware with IPv6 enabled) and hoping someone can help with investigation. In short - wpan0 interface with address aaaa::1/64 is ...
1
vote
1answer
389 views

SSH Tunneling for Munin

I had at home an NAS and in the datacenter a Server. I make an SSH Tunnel with the following command: autossh -fN -M20404 -R 1337:localhost:22 user@server (from the nas to the server) Its working ...
0
votes
1answer
558 views

What does HTTP traffic tunnelled through SSH look like to a network administrator? [closed]

When I am at work we have very tight firewalls, as a way to get around them and perhaps even gain some increased anonymity myself and many of my co-workers have set up SSH tunnels to our own hosted ...