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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IPSec Tunnel + Access to internal DNS on Linux Mint

I'm new to desktop Linux, and have Linux Mint 17 installed. My issue is as follows: I use Shrew IPSec client to tunnel into an internal network at a datacenter. It has its own internal DNS to resolve ...
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10 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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14 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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40 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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1answer
23 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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23 views

Connect OpenWRT router, root server and roadwarrier via VPN - which vpn technology? [closed]

I want to connect a private LAN (connected over an OpenWRT router via DSL), a root server on a hoster and different roadwarrior together to one VPN. On the root server (Debian Wheezy) I´ve installed ...
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27 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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23 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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1answer
91 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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2answers
60 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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118 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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15 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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116 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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19 views

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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29 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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35 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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23 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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1answer
50 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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18 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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1answer
35 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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28 views

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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1answer
145 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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1answer
105 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
45 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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24 views

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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122 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
108 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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1answer
90 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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78 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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2answers
67 views

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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116 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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42 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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130 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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156 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 ...
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1answer
37 views

How to set up vpn tunnel (ipsec) connection

I'm working with a client who wants to set up a vpn tunnel between their network and ours. They're in charge of the tunnel and to give us the access they are asking me my public IP and my LAN IP. ...
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1answer
108 views

Routing internet traffic through a site-to-site IPsec tunnel

We are trying to replicate what is described at https://doc.pfsense.org/index.php/Routing_internet_traffic_through_a_site-to-site_IPsec_tunnel#Set_up_the_IPsec_tunnel_Phase_2 We are using 2 ...
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118 views

IpSec/Racoon: Packets go to wrong tunnel

I use Debian and Racoon to connect to a Cisco VPN Gateway. We have got two tunnels between the same endpoints. Somehow and sometimes, packets go to the wrong tunnel. This is the log message from the ...
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119 views

Linux IPSec, association established but no traffic

We are attempting to setup an IPSec tunnel from a Debian firewall/router to a Netasq hardware firewall. On the Debian side the tools used are IPSec-tools and Racoon. The IPSec SA is established ...
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2answers
1k views

ipsec verify on ubuntu Two or more interfaces found, checking IP forwarding [FAILED]

Ubuntu 14.04, Openswan U2.6.38/K3.13.0-30-generic When I run ipsec verify I get this error. Two or more interfaces found, checking IP forwarding [FAILED] I see quite a few of this same ...
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81 views

openswan slow initial iperf tests

I have some working tunnel servers and although they appear to work, I'm concerned about the results of some performance tests I've been performing. The results look much like this: ...
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306 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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1answer
471 views

Site-to-Site IPsec vpn not sending ping across a tunnel

This is my first attempt at a site-to-site VPN. I chose to use IPec because it appeared to be the best solution for what I needed to accomplish. I've followed several different tutorials over the last ...
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28 views

IPSEC on linux with multiple remote ISP

I have configured 2 ipsec VPN connection from my linux server to my clients locations. the reason being the client has two ISPs a primary and a secondary on. The client wants to switch to secondary ...
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939 views

Cannot connect to IPSEC/L2TP VPN Arch Linux/Windows 8

I have check a lot of other L2TP/IPsec VPN post and none of them seem to quite match the issues I am having so here is what going on. I am trying to set up a VPN on my Arch Linux server that I can ...
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2answers
594 views

Trying to replicate a working IPSec/L2TP config from OpenSWAN to StrongSWAN

I have a working OpenSWAN implementation for RA, using IPsec transport and l2tp for the tunnel, running in AWS. The instance has a private IP, with a public EIP mapped to it. I use the private ip for ...
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1answer
369 views

Openswan and OpenVPN

I have installed Openswan and have configured IPSec tunnels and they work perfect until i install OpenVPN. Now i can't find out way the ping wont work. When i execute the "service ipsec status" it ...
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311 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: ...
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299 views

Windows 7/8 Strongswan IKEv2 Wrong Gateway

I have setup Strongswan on Ubuntu 14.04 from the official package. I use IKEv2 with PKI authentication and a custom authorization plugin. This works great for Android and Ubuntu clients using ...
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47 views

Is there a way to use an external program to authenticate XAuth with StrongSwan IPSec?

I'm currently using StrongSwan for my iOS devices to connect. I was wondering if there is a way to use an external program for XAUTH? I currently have the following configuration: : RSA server.pem ...