Ask Ubuntu
Ask Ubuntu

Questions tagged [l2tp]

L2TP refers to the Layer 2 Tunneling Protocol, which is a protocol for VPN tunnels. Use this tag for questions about how to setup L2TP tunnels on Ubuntu, and for questions about good uses and limitations of the protocol.

In computer networking, Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services by ISPs. It uses encryption only for its own control messages, and does not provide any encryption or confidentiality of content by itself.

Reference: Layer 2 Tunneling Protocol

52 questions
4
votes
3 answers

L2TP VPN is not working on Ubuntu 20.04. Same credential is working fine with Ubuntu 18.04

L2TP VPN is not working on newly installed Ubunut 20.04 and 20.10. Credentials are correct and same is working with Ubuntu 18.04
Nitish kumar
  • 61
  • 1
  • 1
  • 6
4
votes
2 answers

How to setup Strongswan to auth to LDAP?

I'm trying to create an L2TP/IPSEC VPN server in 20.04 that uses LDAP for user authentication. I'm assuming Strongswan does this. Where, in Strongswan or other configs would I add the LDAP server info? Or does it just use SSSD or PAM or something…
Chemdream
  • 153
3
votes
0 answers

Unable to connect to L2TP/IPSec VPN via NM and xl2tp

I have been to troubleshoot all morning as to how to get connected to my employer's VPN via Network Manager. I found a number of support threads on various sites and have tried all of what was suggested, as well as mixes of solutions, and nothing…
Trevor Sears
  • 161
3
votes
3 answers

VPN difference between 16.04 and 18.04

I have 2 PCs which I want to connect to a L2TP/IPSec VPN, one of them runs Ubuntu 16.04 and it works fine. The other one runs 18.04 and it can't connect to the server, although the settings are exactly the same. I compared every detail in the…
jenald
  • 107
3
votes
3 answers

Ubuntu 19.10 l2tp VPN doesn't work anymore

After upgrading from Ubuntu 19.04 to Ubuntu 19.10, my VPN connection doesn't work anymore. My settings: phase1: 3des-sha1;modp1024 phase2: 3des-sha1 This worked fine so far. I checked the packages installed: network-manager-l2tp 1.2.10-1;…
user757306
  • 31
2
votes
2 answers

L2TP IPSEC VPN cannot connect Ubuntu 18.04 Strongswan - PAP authentication failed

I'm trying to connect to a VPN server and it's not working. Output from tail -f /var/log/syslog | grep -E "pppd|charon|NetworkManager|strongSwan|ipsec|l2tp" NetworkManager[22546]: [1627051862.8499] audit: op="connection-activate"…
Jonathan
  • 656
2
votes
1 answer

Ubuntu 20.04 L2TP VPN connection not working

I'm trying to connect my Ubuntu 20.04 installation with my company VPN. VPN in based on SOPHOS firewall. According to details provided by IT department we should use L2TP connection with IPsec and preshared key. Standard configuration as per all the…
Sławomir Ajon
  • 23
2
votes
1 answer

Cloning a Windows L2TP connection: how to resolve L2TP host name?

My ISP uses L2TP to connect users to the Internet. I have a working connection on Windows and now I'm trying to clone it to an Ubuntu VM. Of course, I'm getting the intermittent "service failed to start" and "service stopped unexpectedly" errors…
sigil
  • 489
1
vote
1 answer

Problem with L2TP IPSec VPN from ubuntu 22.04

I have to connect to a VPN L2TP/Ipsec Under Ubuntu 18.04, I used: IPsec Tunnel to L2TP Server - yes Phase1 = 3des-sha1-modp1024! Phase2 = 3des-sha1! Force UDP encapsulation I have installed Ubuntu 22.04 now, the VPN connects, but I cannot access the…
pinguino
  • 21
1
vote
0 answers

Why tcptrack shows no activity of my ppp connection?

I have established a l2tp connection in my Ubuntu 20.04 machine as a client to the remote server. After the establishment, the server assigned itself an IP address of 192.168.18.162 and assigned the client (Ubuntu 20.04) 192.168.18.1. And the…
li_jessen
  • 177
1
vote
1 answer

l2tp vpn Ubuntu 22.04

I've gotten a new laptop and upgraded to 22.04, but I can no longer seem to get the l2tp/ip-sec VPN required for my job working anymore. I'm using the Gnome NetworkManager to configure this (just like the old system) and I do successfully "connect"…
cmwarre
  • 13
1
vote
1 answer

nmcli not showing connection

I imported L2TP/IPsec VPN connection configuration file from Ubuntu mate 20.04 /etc/NetworkManager/system-connections/ to Ubuntu server 20.04 Next, on the Ubuntu server 20.04 PC, I check the nmcli connection with sudo nmcli con which in response I…
epx
  • 31
1
vote
1 answer

How to connect Ubuntu 20.04 minimal instance to a L2TP vpn?

I am trying to connect an Ubuntu minimal instance to a VPN. I have installed network-manager-l2tp and have configured the connection as…
Brendan McCoy
  • 11
1
vote
0 answers

How to set up L2TP client on Ubuntu 20.04?

I did the basics dependencies sudo apt install network-manager sudo apt install network-manager-l2tp sudo apt install network-manager-strongswan But I have a lot of questions: Which IP I should put in Gateway option? I mean, I have an SSH digital…
elton dev
  • 11
1
vote
1 answer

Why is DH20 not correctly negotiated with remote host when establishing an IPSec tunnel?

Trying to connect a computer to a VPN server configured this way : Router# show isakmp policy ISAKMP policy: L2TP_VPN IKD_ID: 8 negotiation mode: main proposal: 1 encryption: aes256 authentication: sha256 proposal: 2 encryption:…
Zulgrib
  • 263
1
2 3 4