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Questions tagged [l2tp]

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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L2TP over IPSec VPN established successfully on main router/firewall, how to access second layer router and its devices?

I apologize if the question doesn't make a lot of sense. Let me explain. I have two routers with a setup like this: ISP-provided modem configured as bridge mode, connected to a TP-Link router TL-...
James's user avatar
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Difficulty setting up a cross-system docker network in NixOS

I've got a collection of docker services that run across multiple servers in a local physical stack. For reasons, I'm trying to keep the exposed ports as minimal and secured as possible (using ...
FaerAnne's user avatar
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Windows 11 L2TP and IPSEC: Where to set the IpSec group

First of all: I know : L2TP and IPSEC from Windows XP: Where do I put the IPSEC group name? exists, but the answer is incorrect and is not working on Windows 11 (please do not duplicate this topic by ...
Bytechie's user avatar
1 vote
1 answer
600 views

OpenVPN, L2TP or PPTP client to proxy (http or socks 4/5)

I'm looking for a way to open a proxy server on Windows or Linux which is bound to a client of OpenVPN or L2TP or PPTP, so the user that is connecting to the proxy is gonna connect to the VPN server ...
ehtku5's user avatar
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Packet forwarding for L2TP/IPSec VPN

I have 2 Server: Server 1: MikroTik RouterOS (Setting up L2TP vpn server) [out of my country] Server 2: Fresh Ubuntu 20.04 OS [in my country] I can't connect to Server 1 via L2TP connection (protocol ...
sMohammad14's user avatar
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500 views

VPN client creation on Ubuntu with strongswan fails

I've set up a L2TP VPN server on my home router and the connection between Windows 10 clients works properly. Now I want to set up a VPN client on a Ubuntu 18.04 machine. I've used this configuration (...
Luca De Fassi's user avatar
1 vote
1 answer
480 views

Configure VPN via .PBK file

There is some software which can only configure VPN/L2TP-IPSec connection using pbk file (GUI has very limited number of the options). I'm looking for pbk documentation but unsuccessul. I see a few ...
amigo421's user avatar
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The specified protocol identifier is not known to the router Windows server 2022

Im trying to configure L2TP vpn on windows server 2022. Everything goes well except when client trying to connect it shows this error : Things ive done : 1- The l2tp preshared key are same.(server/...
Ahad Porkar's user avatar
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4k views

Windows server 2022 ports required for vpn connections have been blocked by the firewall

Im trying to enable VPN server(L2TP) inside windows 2022. everything goes as plan but in the end the Remote Access Management Console Shows this error : Ive also added rule for 1701 port in firewall ...
Ahad Porkar's user avatar
1 vote
1 answer
3k views

Setup L2TP Ubuntu Server without IPSec (yes I know thats very odd)

Im trying to tunnell my traffic from a bunch of low end mikrotik routers through a L2PT tunnel, and these routers are not powerful enough to run encryption. I have Ubuntu 20.04 VPS, and have ...
Evan Feldman's user avatar
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Ubuntu L2TP Server not allow to connect multiple devices

Till today, this website showed me some answers that solve the problem. But it seems I couldn't find the correct answer to this problem. I have a project for a VPN network for remote service purposes, ...
Güray Kunduracı's user avatar
2 votes
2 answers
7k views

Connection failed using L2TP on Ubuntu 20

I am trying to establish a VPN connection but I am unable to do so. The issues points to PPP as can be seen in the log output below. However, I am not quite sure what I can make out of this: /var/log/...
Stefan Falk's user avatar
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2 answers
2k views

Upgraded to Windows 11 now L2TP VPN Connection Fails

I upgraded to Windows 11 now my VPN connections fail. They were working right before the update. The error is... The L2TP connection attempt failed because the security layer encountered a ...
Gordon's user avatar
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Is it possible to have L2TP/IPsec VPN auto disconnect after x hours?

I couldn't find anything on Google, everything that I found was related to the opposite problem, VPN disconnecting when people don't want it to. A little backstory: one of our potential clients needs ...
Rikudou_Sennin's user avatar
1 vote
2 answers
828 views

L2TP Issues AWS EC2

I'm trying to set up l2tp inside an AWS VPC, I'm having problems. I'm on a MAC OS and I keep getting an error "A connection could not be established to the PPP server. Try reconnecting. If the ...
Tim Beekley's user avatar
1 vote
1 answer
1k views

How to encode Pre-Shared Key (PSK) of and L2TP IPSEC connection managed by Network-Manager

If I create a VPN L2TP IPSEC connection using Network-Manager GUI, I introduce the PSK, but this one looks different on /etc/NetworkManager/system-connection/myvpn.nmconnection I am thinking the PSK ...
Javi Hache's user avatar
2 votes
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965 views

Ubuntu Server 20.04 network-manager not starting VPN automatically

I am getting desperate here. I need to connect a Ubuntu Server Machine on a VPS to a network to monitor several machines. I can only connect to the network with L2TP over IPsec. I have tried ...
Javi Hache's user avatar
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1 answer
980 views

RDP fails to connect across L2TP VPN

I have a working L2TP VPN that I can ping all clients once connected, name resolution does not work but I believe that is a separate issue. I cannot connect using RDP between two Windows 10 machines. ...
Charles Bunn's user avatar
5 votes
1 answer
10k views

Configuring L2TP VPN to use with iOS 14 and macOS Big Sur

After Apple did this in Big Sur OS I can't connect to my own VPN on Libreswan 3.27 (netkey) on 3.10.0-1160.6.1.el7.x86_64 Starting with iOS 14 and macOS Big Sur (coming soon), IPsec supports HMAC-SHA-...
megamosk's user avatar
3 votes
1 answer
2k views

Cant connect to VPN via L2TP/IPsec on mac, but connection on windows works

I've setup connection on one of our mac computers running MacOS 10.13.6 High Sierra. I've entered user, password, preshared key ect. but I Cant connect to VPN (getting VPN server did not respond error)...
Mantas's user avatar
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2 answers
731 views

Is there a speed and performance difference between VPNs (L2TP, etc.) vs. port forwarding?

Let's say you wanted to transfer a 1 GB file from a machine at site 1 to a machine at site 2. You can either connect the two machines via a VPN (L2TP) or basic port forwarding. Which connection method ...
Kirk Ouimet's user avatar
-1 votes
1 answer
4k views

How to route traffic between L2TP/IPSec and WireGuard tunnels?

I have a KVM VPS running Ubuntu 18.04 which is simultaneously: L2TP server (xl2tpd + strongswan) with IP 192.168.42.1/24 Wireguard client with IP 192.168.73.3/24 (server's IP is 192.168.73.1/24) ...
bellerofonte's user avatar
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What is an authentication method for L2TP or IKEv2 VPN that sends the username and password?

Google's GSuite Secure LDAP does not expose userPassword. CHAP, MSCHAP and other authentication do not send the password. They assume the server knows the password and can use a challenge. Because ...
Chemdream's user avatar
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1 answer
354 views

In a VPN, how to access resources inside a connected office from the VPN server

I have this Windows Server running on AWS, running a VPN with RRAS and NPS. The initial setup included only SSTP, and the users could easily connect from their Windows computers on their homes and use ...
emedeiros's user avatar
0 votes
1 answer
169 views

Always hung on Vi, vim, but not nano when using company VPN

I have a strange problem. IT changed the VPN to a newer Cisco device. After connecting to the VPN, I can ssh to one of our corporate server. I can ls, cd, cat, sudo. BUT if I tried any editing using ...
RonPringadi's user avatar
2 votes
0 answers
760 views

How to force the server to set ppp0 and ppp1 for the specified VPN connections?

I have two different VPN connections on a server as below: The first connection from a mikrotik server (192.168.100.128 as the client) to the main server (192.168.100.99 as the host with ppp0). The ...
kia's user avatar
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1 answer
1k views

VPN between 2 Mikrotik routers and static IP using LTE USB Modem

I am trying to setup a VPN tunnel between two sites. Both sites are using a Mikrotik U951 with two Jazz 4G modems. Each 4G service has been allocated a static IP. The main problem is that I am trying ...
Anas4795's user avatar
1 vote
1 answer
2k views

l2tp/ipsec unable to connect on linux

I'm trying to connect to cisco l2tp/ipsec vpn with PSK and IKEv1 username/password. According to this article, I've found that server supports following authentification methods: SA=(Enc=3DES Hash=MD5 ...
Denis Sheremet's user avatar
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0 answers
233 views

Wrong certificate used when using the Windows L2TP VPN client

I have my VPN security gateway configured to only allow clients having a VPN computer certificate issued by a specific CA. Such a certificate is correctly installed on the client side. In addition to ...
TomS's user avatar
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1 answer
2k views

Diagnose L2TP VPN connection failures in CentOS 7

My local machine CentOS Linux release 7.7.1908 (Core) connects to my workplace VPN using LT2P IPSec with PSK. I have two gateways, but since both of them produce similar logs, I'm going to post one of ...
Zobayer Hasan's user avatar
0 votes
1 answer
5k views

Failure to connect to a L2TP VPN over IPSec on Ubuntu 16.04

I am having issues connecting to my company's L2TP VPN over IPSEC. This is a Pelink Balance 305 router which has been configured correctly. I have checked that other colleagues have been able to ...
robarthur1's user avatar
2 votes
0 answers
189 views

Windows Server 2016 - L2TP VPN local network issuse

we configured VPN access to our server via L2TP with preshared key to tunnel our RDP admin connection. Everything works fine if we need to just connect to the server - We are behind NAT from out ISP ...
Elenthar's user avatar
1 vote
0 answers
265 views

Why can I not connect to VPN? Domain Joined and mentions "device compliance"

I have the wonderful challenge of setting up our Unifi USG to accept connections from individual domain-joined laptops. I got the supported L2TP server working (as I have used this already for months ...
Fireant456's user avatar
2 votes
1 answer
5k views

Unable to Connect L2TP IPSec VPN on Mac OSX [closed]

I'm struggling to debug an issue connecting a Mac to a L2TP IPsec VPN. Macbook Pro running Mojave 10.14.6, following instructions here https://forum.peplink.com/t/setting-up-l2tp-with-ipsec/8046 I ...
robarthur1's user avatar
0 votes
1 answer
512 views

What Does This L2TP/IPSec Error Mean?

I am trying to connect to a Cisco Meraki VPN that uses L2TP/IPsec. On my side I am using Libreswan/NetworkManager to configure my connection. When I try to connect, I get logs as follows: Mar 02 11:...
Sam Gardner's user avatar
0 votes
1 answer
2k views

RDP connection failed after logging into VPN (L2TP/IPSec) on a sever

I have a virtual machine Win 10, and I can connect to it via RDP (Remote Desktop Protocol) from my local laptop. Now I want to establish a VPN (L2TP/IPSec) on the remote Win 10 to a third host, ...
ya wei's user avatar
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0 votes
1 answer
473 views

L2TP (xl2tpd) IP Address Allocation

I’m making my own study of different ways to establish tunnels between Debian server (LNS) and Android OS (LAC). In case of L2TP without any encryption, LACs should routing traffic through ppp tunnel ...
dm.bokhan's user avatar
1 vote
0 answers
86 views

Route trafic from one wAP to VPN

i have two mikrotik routers. One router - 2011 (main) has public static IP address and has L2TP over ipsec vpn server running on it. I can connect to it from laptops and mobiles. When i connected, my ...
swift2geek's user avatar
1 vote
0 answers
200 views

route l2tp server to openvpn client

i configured l2tp/ipsec server on ubuntu also i installed openvpn client on this server i need when l2tp client connect to this server traffic forward to openvpn and client get openvpn server ip ...
user3699217's user avatar
0 votes
1 answer
3k views

TP-LINK TL-MR6400 IPSEC L2TP VPN tunnel with GCP server

I have a TP-LINK TL-MR6400 router, connected to internet by means of an LTE sim. This is a very rough network diagram of my current situation.1 My IoT services sit behind the TL-MR6400. Unfortunately ...
Nicola Bertellini's user avatar
0 votes
2 answers
6k views

Setup l2tp using Strongswan

I setup ikev2 using Strongswan, Now I need to add l2tp support to that What is the best and easy method to add l2tp support to Strongswan? Appreciate for any help
Farhad Sakhaei's user avatar
3 votes
0 answers
3k views

No internet access through L2TP/Ipsec using Ubuntu 18.04 - Routing table

I have set up a VPN network using the package https://github.com/nm-l2tp/NetworkManager-l2tp. The VPN works well (on certain situations) but I think there's a problem with the routing. When I'm not ...
Jelther Gonçalves's user avatar
1 vote
0 answers
2k views

Connect Ubuntu 19.04 Server to Ubiquity Unifi USG L2TP VPN Server?

I am trying to connect a remote Ubuntu Server 19.04 instance to a Ubiquity Unifi USG L2TP VPN Server. I have the VPN server set up as an L2TP server with PSK and verified that it is working by ...
bjarkef's user avatar
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0 votes
1 answer
2k views

L2TP over IPSEC strongswan/xl2tpd slow connection debian 9 and 10

I have tried almost anything - my internet connection 500 Mbit/s I connect from the same external IP subnet so my speed to the server is also 500 Mbit/s. When i use wget from my l2tp server i have ...
Kriss's user avatar
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1 vote
0 answers
2k views

Strongswan CentOS 7 to Mikrotik Router L2TP VPN "NO_PRPOSAL_CHOSEN"

I have reviewed existing Q&A on this issue and, maybe there's a hook I'm not seeing, but I don't know what else to try. I get this output when attempting to launch VPN from CentOS "client": [...
dmmooney's user avatar
0 votes
1 answer
2k views

Windows Server 2019 - L2TP VPN in RRAS only accessable from internal interface, not from external

I have a problem installing a L2TP VPN Connection with Windows Server 2019. There are two interfaces: "Intern" - 10.0.0.1 / Internal interface "Extern" - 192.168.2.3 / External interface, connected ...
Marc M's user avatar
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1 vote
1 answer
3k views

L2TP VPN connection not working - PAYLOAD_MALFORMED

I am trying to replace an old VMWare server (ESXI 5.1.0) with a new one (ESXI 6.7.0) and to do that we are trying to replicate the setup of the old one. We have another physical server that needs to ...
Crick3t's user avatar
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0 votes
0 answers
2k views

Trying to setup L2TP and IKEv2 on the same server with Strongswan

I'm attempting to setup both L2TP (for use on my Android phone) and IKEv2 (for use on my Mac) on the same server with Strongswan I'm getting the following error when connecting L2TP, but IKEv2 works ...
Keanu's user avatar
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0 votes
2 answers
961 views

L2TP/IPSec: Linux can not connect to Cisco ASA (but Windows can)

Our partner provides a service that is available only through the L2TP/IPSec tunnel. We successfully connect to it from Windows, but the connection hangs dead a couple of times a week. Therefore, I ...
yurybx's user avatar
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2 votes
0 answers
1k views

How do I route internet traffic through an established L2TP connection?

I am struggling to connect and, more importantly, route traffic from an Ubuntu server (this means that Network-Manager and any GUI tools are out of the question) to an L2TP-IPSec VPN server running on ...
LLlAMnYP's user avatar
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