IPsec (Internet Protocol Security) is a protocol for securing IP communications by authenticating and encrypting each IP packet of a communication session.

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FreeBSD L2TP/IPsec not routing traffic to vpn server

I have configured a VPN server on my FreeBSD server, it all seems to be running, but the VPN traffic is not routing through to the local VPN server and I cannot figure out as to why. So my question ...
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Remote end of IPSec transport is 'permenantly glued' to loopback after some messing around with GRE

So, I have managed to get IPSec transport over ESP between two hosts using racoon: the 'local' host, 1.1.1.1, and the remote, 2.2.2.2. It only worked for ICMP (other traffic ignored the SA), but ...
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openswan - computing tunnel count?

When I do an /etc/init.d/ipsec status I see: pluto pid 10435 12 tunnels up some eroutes exist Question is how can I compute ahead of time how many tunnels will exist? I have one site-to-site that ...
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29 views

Expose a machine on the far side of a VPN

We're using a VPN to connect a remote office to our main office, and a machine in the remote office needs to expose port 22 to the outside internet. Complications: The main office has a fixed IP ...
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12 views

Racoon: inherit configurations

Starting to get acquainted with ipsec-tools and racoon, I'm wondering how stage 1 configuration inheritance works. With a sample configuration like this: remote "ParentConfig" { proposal { # ...
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22 views

IPsec transport mode and MTU

[Similar to Right way to set the MTU of an IPsec Client (Linux/Racoon), but different in that there is no router on the responder side] I have a setup where machines in a local network need to talk ...
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28 views

Right way to set the MTU of an IPsec Client ( Linux/Racoon)

Here's the network topology : (PC1:IPsec Client)eth0---Internet CPE---((Internet))---Internet CPE---(PC2:IPsec Server) I've set up an IPsec Internet Gateway : PC1 sends all traffic, encrypted in an ...
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8 views

openswan ipsec tunel configuration

Its posible create ipsec tunel from SERVER1 to internal FTP. (i.e only for application on SERVER1) ? Network scheme: (private APP) (SERVER1 PUBLIC:1.1.1.1) ----------------------- ------- ...
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16 views

File copy problems in only 1 direction through IPSec inter-site VPN

i've a rather strange problem with 2 sites linked by an IPSec inter-site VPN and file transfert from a site to another. SYNOPSYS (tl;dr) : File transfert via smb/ftp/whatever through ipsec tunnel ...
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54 views

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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134 views

Ubuntu VPS running VPN server not forwarding packets

I've asked a related question here - Can't route back down ipsec tunnel from VPS - but I've answered that and moved on a bit. The end goal of what I'm trying to achieve is this: We have a bunch ...
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53 views

Windows RRAS server behind NAT to remote Fortigate via IPSec

I am about to deploy a Windows sever 2012 R2 RRAS server to connect to a FortiGate device via IPSec for site-2-site VPN. Phase 1 ending successfully, however, the Phase 2 failing, the Windows server ...
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1answer
60 views

Can't route back down ipsec tunnel from VPS

I am trying to establish an ipsec VPN from a Draytek router on the edge of our corporate network to a VPS on Digital Ocean. I've set up the VPN on the VPS using this script on an Ubuntu 14.04 machine. ...
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3answers
42 views

PFsense IPSec VPN failing phase 2

I am very new to VPNs and I am getting errors. I have posted the following lines that I think are the most relevant: Dec 2 08:41:03 racoon: DEBUG: IV freed Dec 2 08:41:03 racoon: [EUA]: ...
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30 views

Sonicwall GVC client failing on IKE phase 1 over LTE cell data connection

We're using Sonicwall's Global VPN Client to connect to our TZ210. It works fine over general WiFi, but not with the data connection on our on-call phone. When tethered via WiFi to the phone's ...
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37 views

(RouterOS) IPSec server can't find static policy on client connection

When trying to connect to server that have following settings: /ip ipsec peer> print 0 address=0.0.0.0/0 local-address=0.0.0.0 passive=yes port=500 auth-method=rsa-signature ...
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Linux IPsec VPN w/ racoon: Routing traffic into the internet [migrated]

I'm currently setting up a VPN for my iPad to use when I'm traveling. Here's some basic info (if you need more details, just leave a comment, I will extend the question with the details): An OpenVZ ...
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50 views

PfSense IPSec VPN client

I am new in PfSense I have configured site to site VPN and it works fine, "Site A" ( PfSense) and "Site B" ( SonicWall) both can access each other LAN network. Now i have also configured IPSec Mobile ...
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53 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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201 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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38 views

Force Cisco ASA to change source port NAT

I have a 2 devices, a Cisco ASA and sitting behind it another device. Both the Cisco and the other device have IPsec tunnels but to different locations. I need to ensure that the source port of the ...
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78 views

Connect Multiple Users Behind same NAT l2tp/IPsec

I have installed OpenSwan on CentOS 6, the clients connection to the server is successful and when i direct my browser to http://whatismyipaddress.com on the client it shows the public ip of the ...
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42 views

Openswan and Cisco ASA

i have post this same question on "Unix & Linux" but iv got no answer and will delete from there but ill try here too. I need this as soon as possible to solve it or at least to find out what is ...
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187 views

Fortigate IPSEC VPN Issue

Have a challenging question here. We have a Fortigate 620B which we're trying to use to route some traffic over a VPN tunnel to a customer. We want the traffic to go out of our interface with one of ...
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75 views

How can I connect to a Cisco ASA5540 from Windows Server 2012 over IPSEC?

Given a windows server 2012 client (which I have under full administrator control), and an external Cisco ASA5540 router (which I don't), I'd like to connect to the router to access their internal ...
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194 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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23 views

Route AAA LDAP traffic from ASA through IPSEC-tunnel to Windows DCs

We have one Cisco ASA 5505 in our HQ responsible for connect our remote office with a IPSEC-tunnel and one ASA 5505 at the remote office. The Cisco ASA 5505 in our HQ is also responsible for VPN users ...
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183 views

IPSec Site-to-site VPN speed between Germany and China very poor

we have successfully setup a Site-to-site IPSec VPN connection between our two offices in Germany and China. Below are the characteristics of both sites, VPN and current speeds: Germany VPN Router ...
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Reach non existing AWS VPC subnet from IPSec tunnel

So here is my setup: VPC: 172.16.0.0/16 Subnet 1: 172.16.1.0/24 openvpn server: eth0: 172.16.1.10 tun0: 172.17.0.1 ovpn client 1: 172.17.0.6 ovpn client 2: 172.17.0.10 IPSec VPN is using ...
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37 views

ClearOS OpenSwan to Linksys RV042 VPN not encapsulating packets

I have a big problem which prevents our IP Phones to be working properly for a week now; Our old DFL-210 fried during an electrical event. It was doing an IPSec VPN with our remote site via their ...
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50 views

How to configure strongswan to support iOS mobile devices?

I'm trying to configure strongswan server to support iPhones and iPads. I'm using client certificate for authentication, I have the following configuration for iOS in strongswan.conf : conn iOS ...
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30 views

Domain controller not allowing me to connect to it over IPSec tunnel

I'm trying to connect a Windows 7 computer to a domain controller over an IPSec tunnel. The tunnel has formed and the network is accessible. I have set the IPSec connection to use the windows domain ...
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63 views

Can I have an alert when a IPSEC is down in Fortigate 80C?

We have a fortigate 80c and 60D with an IPSEC VPN . Is there a way to use the log (or other tool) to send an email alert when the tunnel is down? I couldn't see anything on the Log & Report tab
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21 views

Tagged traffic over Checkpoint IPSec

How can I forward tagged traffic over Checkpoint IPSec? Where I can read more info about it? I have Checkpoint R76 and I need to use tagged vlan over IPSec tunnel.
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39 views

IP Addresses over IPSec

I've got four hosts setup as follows: I've got an IPSec tunnel via OpenSwan over the internet between Servers B and C. Servers A and D are configured to route traffic to the other via B and C ...
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12 views

Issue with SNAT and IPsec

Hi I am having issues with an IPsec connection I have, the connection is established this is the output of ipsec whack --status 000 #17: "connection/0x1":500 STATE_QUICK_I2 (sent QI2, IPsec SA ...
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IPsec - strange behavior

I have set up site-to-site ipsec connection between linux(debian) and mikrotik router. The tunnel is up linux configuration: config setup interfaces=%defaultroute keep_alive=60 ...
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276 views

Why are only 3 ip xfrm policies needed for a IPsec tunnel?

I have a site-to-site IPsec tunnel up and running between a strongswan (v5.2.0) instance (site A) and a RouterOS router (site B). Everything works fine, the hosts in the two private subnets setup for ...
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150 views

Security risks of using Google DNS to resolve names on a private net (192.168.x.x)?

Are there any known risks associated with using a public DNS versus a DNS which we or our partners control? Our solution involves a few embedded devices so using Google DNS would give us a degree of ...
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1answer
54 views

Does a site-to-site IPSEC vpn need an always on connection?

Does a site-to-site IPSEC vpn needs an always on connection/tunnel with keepalives or is it possible to only encrypts packets when needed (when it matches a route or something like that)?
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Ipsec right side multiple ip's and phases lifetimes

This is my setup for ipsec: conn outside_company authby=secret ike=aes256-sha1;dh2 phase2=esp phase2alg=aes256-sha1;dh2 pfs=yes keyingtries=3 ikelifetime=24h ...
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256 views

vpnc: no response from target

I have not be able to for a tunnel using vpnc or shrew soft to my pfsense box running IPSec. I have made sure that the correct ports are open, the user I'm trying to log in has the correct permissions ...
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1answer
177 views

Cisco 2901 - IPSec VPN Maxing CPU

We have a Cisco 2901 on the edge of a 100Mbps/100Mbps WAN link which is providing an endpoint for an IPSec VPN to a Juniper SSG 550M. The problem is that we are seeing a max of 'only' 40Mbps over the ...
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125 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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111 views

Creating redundant IPSec connections using OpenSwan

I have a linux (netkey) instance with openswan installed, the instance has two connection to the same IPSec peer that needs to act as redundant connections. both connections' properties are the same ...
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Allow only IPSEC outgoing traffic to a port (using IPTABLE?)

Problem: I've a situation where IPSEC server and the target server (Say http server) happens to be the same machine and I need allow ONLY the traffic coming through IPSEC server to have access to a ...
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153 views

Shorewall: DNAT to IPSEC tunnel zone not routing correctly

I have a ipsec tunnel working that gives access to a 192.168.4.0/24 lan. It is working fine and I can access hosts on the other side without problem: # from fw and lan hosts: # ping 192.168.4.44 PING ...
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53 views

Openswan not updating the routing table

I have problems to find solution about this. I have Openswan and ASA configure IPSec VPN tunnel and the connections is established and working but with some little problems. The topology is looking ...
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140 views

IPSEC VPN with same remote peer IP - Only 1 remote connection at a time

I am using a Mikrotik router to connect multiple road warriors (Avaya phones) with IPSEC VPN behind the same WAN address. The first phone connects fine, when the second phone connects the first phone ...
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181 views

OpenSwan IPsec connection drops after 30 seconds

I'm trying to connect from my Linux Mint 16 box to a CloudStack server through IPsec L2TP. Building up the connection works (pings work across the tunnel). However 30 seconds later the IPsec tunnel ...