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 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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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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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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74 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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65 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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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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823 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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421 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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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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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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354 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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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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343 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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443 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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368 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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656 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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63 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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1k 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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389 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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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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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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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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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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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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859 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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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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1k 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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311 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 ...
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394 views

Cisco ASA 5505: PAT / NAT between 2 IPSec Tunnels

I've the following Setup: Customer <-> HQ <-> Branchoffice The Customer has a 192.168.1.0/24 subnet. On the HQ only the VPN Gateway is in my context, 172.20.10.1 . And on the Branchoffice ...
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4k views

Allowing LDAP authentication from DMZ to Active Directory. Is my idea secure?

I have a internet-facing application server that I want to use AD authentication. This is my first time doing this for a none MS application or without some sort of proxy. I already have a idea in my ...
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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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188 views

vServer: Configuring single (/128) assigned IPv6 addresses for use as IP address pool for IPSEC (Strongswan) road warriors

I've a new (dev) vServer up and running. Unfortunately the provider only hands out single IPv6 addresses (not even /64 subnets). Now I am a bit confused how to achieve the following: I want to use ...
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396 views

Route between two branch offices via IPsec VPN to head office?

I have TMG 2010 running on Server 2008 R2 in our head office with 2 branch offices connecting in using Dray Tek 2930 routers with IPsec site to site VPNS. The remote sites can route between the head ...
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Allow traffic from ssl-vpn to enter ipsec tunnel on fortigate

we configured our FortiGate 50B to route traffic from our local net 192.168.10.* (which is our office) to a remote network 172.29.112.* using an ipsec tunnel. Everything works fine as long my computer ...
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384 views

Windows 2008 R2 site-to-site IPSEC tunnel with Juniper: tunnel up but packets are lost

I am stuck on this task almost for 2 days. Organized a site-to-site IPSEC tunnel between Juniper and Windows2008R2 machine (let's call it W2008R2 for reference). W2008R2 is a multihomed machine (2 ...
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1answer
2k views

SSH not working over IPSec tunnel (Strongswan)

I configured a small network on a cloud virtual machine. This virtual machine has a static IP address assigned to eth0 interface that I'll call $EXTIP. mydomain.com points to $EXTIP. Inside, I have ...
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Windows 2008 R2 IPsec encryption in tunnel mode, hosts in same subnet

In Windows there appear to be two ways to set up IPsec: The IP Security Policy Management MMC snap-in (part of secpol.msc, introduced in Windows 2000). The Windows Firewall with Advanced Security ...
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Vpn tunnel to Amazon VPC with pfsense

I'm trying to create an ipsec tunnel between my office and our Amazon VPC. However I have never used ipsec before so I'm at lost. The gateway/firewall is running pfsense 2.1.3-RELEASE (i386) on ...
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963 views

FreeRADIUS w/ MySQL backend. IP Pool

I have a pool of addresses (172.16.0.0/24) configured on my NAS (Cisco 2921 router) for my IPsec clients. I have various subnet mask length subnetworks used for different user groups. For example I ...
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Strongswan (IKEv2) connection established, but no traffic routing

I've seen this sort of question posted a few times before, but so far, none of them have solved my issue. I'm trying to set up an IKEv2 VPN on my Ubuntu Server to use with my Windows Phone using ...
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444 views

How to exclude LAN traffic from IPSEC policy

I am trying to replace a Firewall/VPN appliance (Snapgear SG300) with another (Mikrotik RB951G-2HnD). My current router works, but, for the new mikrotik router, when I add the phase 2 tunnel, I can ...
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657 views

Is it possible to do IPSec Site to Site VPN without static & public IP on one end?

I am working on a project for my engineering degree that requires me to interface with some pre-existing equipment, so I am rather limited on my options. I'm rather new to VPN and ipsec for that ...
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IPsec Xauth RSA - Debian 7 and Android 4.4 VPN (Always-ON) and Mac OS X 10.9.2 VPN (On Demand)

I successfully installed IPSec Xauth RSA using this instruction: http://jsharkey.org/blog/2012/09/22/deploying-a-pure-ipsec-pki-vpn-server-for-android-devices/ In brief: apt-get install ipsec-tools ...
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is there any cisco-compatible ipsec+comp module?

I am looking for a waqy to establish an Ipsec tunnel(with lzs-compression enabled) between a cisco router and a host(using strongswan or sth else). I can establish a tunnel without lzs-compression. ...
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Elastic IP address on EC2 instance interface without 1:1 NAT

I have a basic Amazon VPC set up with a public and private subnet. I have deployed a Vyatta router in the public subnet that does NAT for the private subnet. I have an elastic IP address assigned to ...
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4k views

Openswan Cisco ASA 9.1 — cannot resopnd to IPsec SA request because no connection is known for

Ok, so I have a simple VPN IPSEC setup with a single Linux host that has a public IP address and a loopback interface of 172.16.255.1. On the right side I have a Cisco ASA 5505 9.1. the issue is the ...
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184 views

User can access Windows based Apache sites but not linux Apache server over site-to-site VPN

I have a user (Win 7 Pro 64-bit) in a satellite office (10.1.0.0/24) that is trying to access web services in our main office (10.0.0.0/16) over a site-to-site VPN between a a Meraki MX60W and a ...
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Openswan is not sending packets on new ip after DPD

I have configured tunnel with DDNS. After appliance get rebooted the other side is not sending packets on new ip-address (even i have set dpdaction=restart). I am using openswan 2.6.38. Here is my ...
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Strongswan with X.509 authentication and LDAP authorization

I would like to setup Strongswan/Libreswan with PKI authentication. Now I have searched and found only how to configure specific accepted client certificates like here: http://technikenity.blogspot....
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327 views

VPN Tunnel set up Issues - Cisco WRVS 4400N to Server 2008 R2behind ASA5505

I was wondering if someone could help with a scenario i have that i am not sure how to set up regarding a VPN tunnel set up. I have a Cisco WRVS4400N business router , and on this device , i need to ...