VPN is the acronym for Virtual Private Network - a network type that uses a the Internet to provide remote networks or single machines with secure access to their organization's network avoiding expensive leased lines.

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VPN Security: unknown users trying to connect PPTP VPN

I've configured a PPTP VPN in a small company which so far is running well. In the VPN logs, they've found several logs of attempted connections from unkwoun users, one attempted connection every ...
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2answers
3k views

OpenVPN DNS Fails to Resolve

I am connected to an OpenVPN server that is configured with the options to redirect the VPN as the default gateway and to push my internal DNS servers: push "dhcp-option DNS 192.168.1.2" push ...
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5answers
1k views

Tips and Suggestions IP Address Re-Addressing?

My ever evolving and expanding local area network is currently using a class-C address. My network consists of multiple subnets depending on site/location. 192.168.1.x is site HQ 192.168.5.x is ...
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2answers
8k views

Is there a way to stop relaying network traffic through VPN?

I have been experimenting with VPN lately, and I managed to get it running on W7 PC. The problem is, though, that as soon as someone connects to my PC, the internet traffic from their PC is routed ...
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3answers
803 views

How secure is a VPN connection over WiFi?

I travel a lot and connect to public wifi hotspots all the time. What information will be given out if I use VPN within public wifi hotspots? Will the owners or intruders in the hotspot be able to ...
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2answers
186 views

stunnel vpn traffic and ensure it looks like SSL traffic on port 443

I am trying to make my outgoing and incoming traffic look as legitimate as close to SSL traffic as possible. Is there a way to DPI my own traffic to ensure it looks like SSL traffic and not OpenVPN ...
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1answer
685 views

Renting a IPv4 address block [closed]

I am building a lab network with about 10 virtual routers and 20 host machines (also virtualized) as a part of a school project. The aim is to demonstrate a wide range of IPv6 routing, deployment and ...
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3answers
1k views

Tunneling all TCP and UDP traffic through a Server?

On a Linux or Windows system, how would it be possible to tunnel all TCP/UDP packets through a thirdparty server? What would one use, does it work with SOCKS5, OpenVPN or SSH?
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3answers
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Does Windows 7 VPN work with a Cisco ASA 5510

We have a Cisco ASA 5510 router and are trying to get a couple users setup for VPN access. They are running Windows 7 x64 at home and cannot install the VPN client we have for our router (it only ...
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3answers
2k views

What is difference between L2TP and PPTP?

I need a high performance VPN server, who can tell me the difference between L2TP and PPTP ?
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4answers
5k views

Problems with SCP stalling during file copy over VPN

I have a series of files I need to copy via SCP over a VPN to a remote linux server each night. The files are not large, we're talking about tens of megabytes here, but the file copy almost always ...
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4answers
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How can I speed up file transfers over VPN?

Our VPN users experience very slow file transfers (50MB can take 20 minutes with a 20Mbps FiOS connection on each side). If the file is transferred over HTTP or FTP, it's just as fast as you expect. I ...
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1answer
434 views

Can my ISP know that I am connected through a VPN?

I have a general understanding of VPNs and how they work. However, I am not sure of how the initial request is seen by my ISP? For example say I am connected to an OpenVPN provider, what happens when ...
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6answers
26k views

Fortigate VPN client “Unable to logon to the server. Your username or password may not be properly configured for this connection. (-12)”

We're running a Fortigate 100D, and having some trouble with the SSL VPN via FortiClient. I installed FortiClient on an external Windows 7 PC a few days pack and the SSL VPN connected and worked. I ...
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3answers
2k views

Is a cloud-based domain controller behind a VPN feasible?

I'm considering setting up a windows domain controller in MS Azure within an Azure virtual network. Goal is to be able to centrally manage GPs and users. Is this even feasible, since the client ...
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2answers
1k views

Bypass openvpn for particular ip

My desktop machine runs Trisquel GNU/Linux 6.0 (which is basically a libre version of Ubuntu 12.04), and I use OpenVPN to connect to a commercial VPN provider for internet access. It currently routes ...
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2answers
8k views

Connect to a Fortinet VPN with Ubuntu

I don't know a lot about VPNs but I'd like to connect to a Fortinet VPN with Ubuntu. I can connect on Windows using Forticlient just by entering the policy server (vpn.theserver.com) and then it asks ...
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2answers
6k views

How to make iPhone Cisco VPN client work with ASA with certificate authentication

I have an ASA that's providing IPsec VPN services using certificate authentication (no xauth, just the certs). It works perfectly with the Cisco IPsec VPN Client. Now I'm trying to let iPhones ...
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4answers
3k views

P2P VPN: cross between Hamachi and OpenVPN

I recently started using OpenVPN. It is useful because you can securely connect many clients from different networks. However, when two clients communicate, they are not directly connected but they go ...
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4answers
4k views

VPN server on Arch Linux

Trying to set up a VPN server on an Arch Linux box. All I want is for it to be usable by OS X and iPhone OS. I'm a noob at VPN and can't seem to have much luck googling. What software do I need to ...
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2answers
171 views

Can BIND alter a response based on requesting IP address?

Hello Serverfault, I work for a hospital who set up their network using 192.168.0.0/23 (before I arrived). We are wanting to have laptops and mobile clients connect from remote locations using VPN, ...
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3answers
10k views

Windows 8 - no internet connetction to some hosts while VPN is active

I use VPN to access the servers at work. When VPN is used, all network traffic to the Internet passes through my company network. It worked without any problems on Windows 7, now on Windows 8 some ...
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5answers
2k views

SSH remote access vpn tunnel

I have two machines both running CentOS linux, one is public facing machine with a real ip address (foo). The other is at a client's site behind a very restrictive firewall and with no real ip and no ...
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1answer
1k views

What is the difference between Microsoft VPN and Cisco VPN

What is the difference between Microsoft VPN and Cisco VPN? Are they just separate implementations of the same protocol? I seem to remember hearing somewhere that they were not compatible with each ...
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5answers
5k views

VPN server on Google Compute Engine with OpenVPN

I'm trying to use Google Compute Engine server as VPN server for all my traffic (I'm living in Russia, we have some issues with censorship here). There is mini-tutorial about VPN on GCE, but it's ...
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1answer
3k views

Which ports to forward for a VPN server that sits behind a firewall?

Question pretty much says it all. From what I have found, it seems that port 1723 is the main port to forward, but I also see numerous references to others ports. The server that is hosting the VPN ...
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4answers
5k views

pfsense 2.0.2 racoon(ipsec vpn) unreliable

I'm having issues with racoon (ipsec VPN) on pFSense 2.0.2 (and 2.0.1). According to racoon all my tunnels are up (I have about 130 of them), but over time more and more of them won't pass traffic ...
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2answers
819 views

What should I use instead of MS-CHAP v2?

There's a new tool and service that makes it very easy to break MS-CHAP v2, which is used to secure VPNs. A good summary of the attach against MS-CHAP can be found at Ars Technica. Here's the way I ...
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1answer
485 views

Is it possible to connect two IPSec site-to-site VPNs to one Windows 2008 Server?

I need to connect to two IPSEC site to site vpns from a Windows 2008 Server at the same time. Is it posible? I tried to assign two IP Security Policies, but it seems I can only have one assigned at ...
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2answers
294 views

remote network access to LAN devices - VPN/LAN

I have several energy meters (with a web server embedded) distributed in many buildings, all these sensors are connected to the local network so that can be accesed through a browser to see the real ...
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votes
1answer
4k views

PPTP VPN iptables firewall issues csf [closed]

I am having a problem with iptables and a PPTP VPN, I have read related topics both on hear and online but still can't get it to work! I am trying to set up PPTP on an ubuntu server on our local ...
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1answer
3k views

Simplest possible VPN to Amazon EC2 instance

I have setup an EC2 instance (Windows Server 2008) that I will let different developers connect to. Since I want the connection to be secure I am trying to setup a VPN connection to that machine, but ...
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2answers
4k views

iOS/Mac-Compatible IPSec VPN Server on Ubuntu

I pay for a VPS from a Xen VPS host and the load on it is fairly light, so I'd like to run a VPN off of it. The configuration I'm shooting for is "roadwarrior"-style, as I'd like to use it to secure ...
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2answers
5k views

Mac OS X PPTP VPN issue ping: sendto: No buffer space available

The VPN connects successfully but after some time the connection is unusable (VPN is used as primary gateway). Ping would reveal: ping: sendto: No buffer space available This looks like the same ...
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3answers
263 views

Optimal SVN server configuration for personal use

I have a desktop machine that is currently set up as an SVN server. Currently I have it set up to be accessible via http (using Apache), but only for the local network, as I wasn't confident in my ...
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2answers
2k views

Script logon to a 'Cisco' VPN in windows

I would like to sync my development database with actual data from the production databases on a regular basis (say, weekly). I already have the scripts to do this, and the amount of data is not huge. ...
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2answers
15k views

Can't establish PPTP VPN windows 8/8.1

I am having an issue where I keep getting either error 800 or 807 whist trying to connect to a VPN server via PPTP on Windows 8 and 8.1 pro. The server itself is Synology's VPN Server running on a ...
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1answer
3k views

VPN server not responding, no indications of blocked traffic

I have a Mac OS X Server (10.9) machine running a L2TP/IPSec VPN server. Configuration appears to be fine, and the hostname of both the server and the VPN is set to a DynDNS hostname. The server is ...
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1answer
272 views

OpenVPN needs to change its port every time I use

I have a Linode VPS that I setup OpenVPN server on it. Since I'm in China we have to deal with the GFW (Great Firewall), so I use the VPN a lot. The weird part is, that every time I use it, I need to ...
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1answer
2k views

Nmap ping scan over a VPN tunnel return all hosts alive?

I'm curious as to why running an nmap -sP (ping scan) on a remote subnet linked via a Cisco site-to-site IPSec tunnel returns "host up" status for every IP in the range. [root@xt ~]# nmap -sP ...
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3answers
533 views

How can I ensure home VPN users don't save connection password?

We are using a PPTP VPN, on Windows RAS/Server 2003. We have users verify anti-virus patching, and then after verification grant access to the VPN. We don't use a CMAK applet, we just provide users ...
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2answers
1k views

Is there an SSTP (Secure Socket Tunneling Protocol) server available for Linux? [closed]

I'm interested in installing an SSTP VPN server on one of my Linux VPSes somehow, but as far as I can see there are only servers available built in to Windows Server. Is this correct or have I just ...
4
votes
3answers
5k views

What might prevent IKE handshake success in building an IPSEC tunnel?

We use Cisco ASA for our IPSEC VPNs, using the EZVPN method. From time to time we encounter problems where an ISP has made a change to their network and our VPN stops working. Nine times out of ten ...
4
votes
1answer
6k views

How to route traffic from a VirtualBox VM only over a VPN?

I've got a VirtualBox VM (both host & guest Ubuntu Maverick). My VPN provider uses OpenVPN to setup TUNs. I'd like to set things up so that traffic from the VM only goes over the VPN and is just ...
4
votes
1answer
213 views

Remote support via VPN without split tunnel

my title might not be very clear, but I'll explain my setup in more detail now. We have several customers (companies) that need to be remotely supported. At these customers we have servers running ...
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3answers
6k views

IPSec tunnel between FortiGate and iPhone / iOS - Works except for DNS / Wins

I have configured my Fortigate with a new VPN IPSec tunnel to allow the iOS Cisco client to connect. That works fine. I can RDP to my servers, browse to my servers via IP address, etc. But, the ...
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2answers
322 views

Sharing a VPN connection among several servers with certain IP ranges

I have an OpenL2TP VPN instance running to a company providing me with connections to cellphone modems in the 10.4.2.0/24 private IP range. This server is on the same private network as three other ...
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2answers
427 views

Login-time quota for VPN users

I have configured Routing and Remote Access Service in Windows Server 2003 as the VPN server. VPN users are defined in Active Directory which is running on this server too. How i can configure the ...
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2answers
1k views

IPSec VPN on Vista

My company uses IPCop to configure it's VPN. We have an IPSec script that runs on Windows XP to open a connection using a security certificate for authentication. Microsoft totally changed things ...
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2answers
506 views

TCP connection through IPSec (Linux/Strongswan) stalls after exceeding PMTU

The backups (via Bacula) of one of my servers (“A”) connected via IPSec (Strongswan on Debian testing) to a storage daemon (“B”) don't finish 95% of the times they run. What apparently happens, is: ...