Layer 2 Tunnelling Protocol is a layer 7 networking protocol which provides an unsecure layer 2 tunnel. It runs on top of UDP, and is commonly used to carry PPP sessions. Security is usually provided with the addition of IPsec.

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Encrypted layer 2 tunnel over Internet for a contiguous subnet

I have two offices that are connected at layer 2 with fiber on a primary link with contiguous subnets on each end(it won't change anytime soon). It works just fine, I have full end-to-end layer 2 ...
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L2TP loadbalancing

Due to need to scale, I'm setting a new l2tp server using l2tpns and trying to balance the load between my two l2tp servers using LVS LVS configuration ipvsadm -A -u 192.168.10.10:1701 -s sh ipvsadm ...
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Cannot estabilish connection via VPN/L2TP to server

Hello system administrators! I would like to ask you a question, because I was looking at various internet tutorials for this, and nothing worked, so... I can't connect to server via VPN, it looks ...
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48 views

How to deny connections to xl2tp without ipsec encryption?

I try to setup l2tp+ipsec server for my mobile use and my home router use. So I made some setup and checked it works fine from android device. I see encryption on ipsec --status. My system is CentOS ...
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177 views

Mikrotik IPSec Tunnels not working after RouterOS upgrade

We upgraded our RB1100AH2x yesterday from 6.19 to 6.22 and lost our L2TP / IPSec tunnels in the process. The logs are now littered with IPSec errors stating failed to pre-process ph2 packet. In ...
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82 views

cisco ASA 5505 l2tp vpn

I have a problem with cisco asa 5505 vpn configuration. I set l2tp for windows clients. I can connect to vpn but: when i have "use default gateway on remote network" on NIC enabled i have access to ...
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58 views

mac vpn to l2tp server running on sonicos 5.9 fails

I've been trying to get a L2TP VPN server setup on a Sonicwall TZ215. By all accounts, I believe it's setup correctly. Firewall access rules, NAT policies, are all setup to accept the L2TP ip pool ...
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188 views

How to debug IPsec L2TP authentication failure (Ubuntu StrongSwan client to Windows Server 2012)

I'm trying to connect via IPsec L2TP to a Windows Server 2012 server. Both the clients and the host are behind a NAT. I can connect from a Windows 7 machine without any problems, but when trying to ...
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146 views

Cannot connect to my L2TP IPSec VPN

I am trying to get my VPN (L2TP IPSec PSK) to work. I have a Synology NAS where I have setup everything as it says on the Synology support page. In my Asus RT-N66U router I have opened UDP ports ...
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141 views

Clients cannot connect to L2TP server on Ubuntu 12.04 & 14.04 LTS

I am trying to set up a L2TP/IPSec server on AWS with instance running Ubuntu 14.04LTS. I followed the instructions that I found here : https://raymii.org/s/tags/vpn.html. I tried to use 12.04LTS ...
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119 views

FreeBSD L2TP VPN connection error

I have a L2TP/IPsec VPN server on FreeBSD 10 set as this article. Everything works fine except clients cannot receive packets from outside. Here is the tcpdump result when a connected client tries to ...
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85 views

Sonicwall L2TP Server is using a “phantom” internal DHCP server

Following a few articles on options 121 and 249, I'd like to push out routes to the L2TP VPN clients using the internal DHCP server on the Sonicwall. However, the Sonicwall seems to be using a ...
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35 views

L2TP Client Routing

I've setup a VPN Terminator in our DMZ using Windows 2012 R2. It is multi-homed with 2 interfaces: 1 to the DMZ for incoming connections from VPN clients, 1 to our LAN for the tunnelled traffic from ...
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1answer
550 views

Softether vpn ufw firewall config - is it correct?

I've correctly installed and configured Softether on my Ubuntu 14 x64 VPS in local bridge mode with a virtual TAP interface. What I have now is a fully functioning L2TP/IPSEC server with two network ...
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2answers
152 views

NAT Masquerade to a L2TP/IPSec connection

I'm trying to create two networks (using a debian server) : The first one is intended to pass packets in a normal way (to my ISP). The second one is intended to pass packets via a L2TP/IPSec VPN ...
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137 views

Phones & tablets cannot connect to Windows Server 2008 RRAS L2TP VPN server

I had installed RRAS in the server running Windows Server 2008 Standard. It's configured as a L2TP VPN server. The Windows and Mac OS X PCs can connect to the server without problem but the android ...
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348 views

Multiple Windows clients behind a same NAT gateway cannot connect to L2TP/IPsec VPN server at the same time

I have set up a L2TP/IPsec VPN server on a cloud VM (with a public IP address) running CentOS 6.5 (kernel: 2.6.32) with openswan/xl2tpd (openswan: 2.6.37, xl2tpd: 1.3.6). However, if multiple Windows ...
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279 views

Can't connect VPN tunnel when other on same NAT-router is connected

We have recently changed our FW to a ZyWall 310 with drastically improved throughput over the old one. However there is a new problem that occurred, we have several L2TP/IPSec clients that connect to ...
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560 views

How can I configure IPSec on Windows 2012 R2 to use Pre Shared Key compatible with Android phones?

Our company has to comply with the mandate that all mobile phones use L2TP or IPSec VPNs when using untrusted Wifi or GPRS connections... namely to protect from MITM attacks. Were also interested in ...
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2k views

Authenticating Active Directory Users to Mac OS X Mavericks Server L2TP VPN Service

We have a Windows Server 2012 Active Directory Infrastructure that consists of two domain controllers. Bound to the Active Directory Domain is a Mac OS X Mavericks Server 10.9.3. The server runs ...
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123 views

L2TP within local network not working

i can't connect to my vpn server when i'm in the same network and use the external ip address to connect. It seems like the server doesn't receive any traffic. When i'm outside the network OR use the ...
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214 views

xl2tpd doesn't connect and no logs with Openswan

I'm using Openswan and xl2tpd to set up a VPN connection for a Windows computer, everything looks perfectly configured and the IPSec connection is successful : STATE_QUICK_R2: IPsec SA established ...
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232 views

Openswan sessions hanging with multi user VPN configuration (ipsec/l2tpd)

I've got a linux box running openswan and xl2tpd. It's a simple configuration with multiple users connecting using a sharedKey, and then establishing an L2TP connection with PPPD providing the ...
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566 views

Cannot connect to VPN on Server 2012

We run a small business and have a server that runs our VPN on Windows Server 2012. Our VPN was working fine until we restarted our router and it seems that restart procedure broke the VPN. We are ...
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624 views

Is it possible to configure L2TP IPSec connection on a Fortigate 30D?

We've got a FortiGate-30D running v5.0,build4225,130521 (GA). I've managed to configure Cisco IPsec VPN and Web-SSL, and tested both, but I'm unable to configure the L2TP IPSec VPN. Looking at the ...
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218 views

L2TP VPN Connection on Debian Squeeze

I need to make an L2TP VPN connection from a Debian Squeeze server. What I have is: The server IP address Shared Key My username and password Just using these 3 parameteres I can establish the ...
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Is it possible for L2TP VPN to do auto route configuration for client during connected?

We've setup a L2TP VPN server with this tutorial, everything works like a charm. The only issue is We don't want client to route all traffic using this VPN, only a particular subnet, e.g. ...
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369 views

Site to site IPSec VPN between Server 2012 and USG 50

I am looking to setup an IPSec VPN server in our organisation using a Windows server 2012 machine with remote access and routing installed. I would then like to perform a site to site IPSec VPN ...
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130 views

OS X Server ignoring static VPN IP request

I've just enabled the VPN service on OS X Server, everything is working fine however we are facing one issue. All of our clients (about 30 iMac's) are connecting to the VPN with a static IP however OS ...
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148 views

L2TP VPN disconnects on sustained file transfer from server LAN computer to VPN client

VPN Server: Windows Server 2008 x86 RRAS installed and running All necessary firewall ports are open, I no longer get rejected log entries Behind router which is DHCP, serving 192.168.0.2 to ...
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287 views

WIndows 8.1 VPn stops working

I am having a problem that every day i have to re-install my cisco VPN client because it will not work. I can connect and the routes get published to by computer, but i can not ping anything on the ...
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2k 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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469 views

l2tp vpn is disconnected after few minutes

I installed IPSec/L2TP on my vps server. I tried to connect from my mac to this VPN server. First time, connection is succeeded. But after a few minutes, connection was broken by itself. After ...
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769 views

Forwarding VPN via reverse SSH tunnel

I have a server that reverse ssh tunnels to a secondary server. The secondary server then acts as a "bridge" to the internal server (the external server's IP address is what I connect to). This works ...
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1answer
697 views

L2TP/IPsec through HTTP Port 80

i got an VPN (L2TP/IPsec) Tunnel running on my synology nas. my router is configured for vpn passthrough. so everything is fine. furthermore i got an webservice running on port 80. now i got the ...
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L2TP connection error via Windows 8 client

When I try to connect to an L2TP server via Windows 8 client I receive error 789:The L2TP connection attempt failed because the security layer encountered a processing error during initial ...
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613 views

StrongSwan + xl2tpd client timeout between 2-5 minutes

I run CentOS 6.4 on Amazon EC2, using xl2tpd-1.3.1 from EPEL repository together with StrongSwan 5.0.4. I setup a simple IPSec connection: conn l2tp type=transport keyexchange=ikev1 ...
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202 views

Configure RRAS to send DNS search domain to Mac L2TP VPN client

Is there any way to make RRAS send the default search domain (ie the connection's search domain, the FQDN of the domain in question) to Mac clients who connect via L2TP? Or is this something that just ...
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365 views

l2tp/pptp + freeradius (accounting information only gets updated on disconnect)

I have a basic PPTP/L2TP setup that uses a remote freeradius server with mysql. Issue is that when a user gets connected to the vpn and as long as the user stays connected (could be hours), no ...
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601 views

SonicOS Enhanced 5.8.1.2 L2TP VPN Authentication Failed

I have a SonicWall TZ 215 running SonicOS Enhanced 5.8.1.2-6o. I have configured the L2TP VPN using the default crypto suite ESP: 3DES/HMAC SHA1 (IKE). Proposals are as such: IKE (Phase 1) Proposal ...
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I can connect, but cannot ping/route to remote VPN computers

Setup: L2TP VPN Server on a Windows Server 2008 machine which is behind a router, which is behind a modem/router. Modem/Router (IP: 192.168.2.1, Subnet: 255.255.255.0, DHCP serves 192.168.2.2 to ...
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929 views

MikroTik not accepting VPN connections over wifi

I'm using MikroTik RouterOS v5.18 x86 on a Dell PC. I have done the following: Set Addresses Set PPPoE Client & Server Set PPTP/L2TP Server Make Profiles and Secrets SRCNAT MASQUERADE the IPs of ...
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558 views

L2TP server allows connections through firewall for iPhone/iPad, but not windows

Our L2TP server (running Windows 2008 RRAS) is behind a NAT firewall. I've already verified that it is passing NAT-T. The firewall rules are all set up correctly to pass GRE, IKE, L2TP and there are ...
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307 views

718 error number while connecting to server

i have configured nttac+ to my server and set authentication to radious server , but when i want to connect to my server through l2tp i get 718 error number ! log file of nttac is : #24-02-2013 ...
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Android devices fail to connect to MS L2TP PSK

I have configured MS Server 2003 RRAS with IPSec / L2TP using PSK. iPhone devices connect fine however Android devices fail to connect. The MS "Oakley" trace file shows the negotiations for Apple and ...
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Simple L2TP/IPsec server not working (openswan, xl2tpd, Ubuntu, Windows)

I configured openswan and xl2tpd on an Ubuntu 12.04 server (on EC2) by following various tutorials/documentation which seem to largely say the same things, but most recently this one. However, my ...
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1k views

openswan and xl2tpd tunnel not working?

Since weeks i want to setup l2tp tunnel with xl2tpd and openswan in debian wheezy, the external interface is ppp0 with dynamic ip and the internal interface is eth0 with ip address 192.168.1.1. l2tp ...
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2k views

L2TP over IPSec VPN (OpenSwan, CentOS 6) unable to connect via iPhone (iOS 5.1) and Android (JellyBean)

I have successfully installed L2TP over IPsec VPN (PSK) using OpenSwan 2.6.38 running on CentOS. Connect DOES WORK perfectly from Windows 8. But doesn't work AT ALL from iPhone 4 (ios 5.1) or ...
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How to change L2TP/PPTP VPNs port

on centos 6 there are open source implantations of L2TP VPN (e.g xl2tp), i wanna know that if default l2tp vpn port blocked can we run vpn on different ports or maybe change cipher setting ? what ...
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Ubuntu IPSEC/L2TP Server EAP-Authentication

I want to set up an Ubuntu VPN-server. My system is running Ubuntu Server 12.10. IPSec(openswan) is running fine, but on my WinXP-Client I'm only able to connect to the VPN with the domain. ...