You can create a secure tunnel between two LANs secured by a firewall.
This article describes creating an IPsecInternet Protocol security - A network protocol used to encrypt and secure data sent over a network.VPN tunnelKerio Control includes a VPN tunnel which allows to distributed offices to interconnect their offices securely. between Kerio Control and another device.
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Before you start, read the topic which describes Kerio Control settings. For more information refer to Configuring IPsec VPN tunnel.
Default values in Kerio Control
This section includes default and supported values for IPsec implemented in Kerio Control.
Both endpoints should be able to communicate automatically. If a problem occurs and you have to set the values manually, consult the following tables for default and supported values in Kerio Control.
The default values are used by Kerio Control. Remote endpoints of the tunnel can also use the supported values.
Phase 1 (IKE):
Variable | Default values | Supported values | Unsupported values |
---|---|---|---|
mode | main | aggressive | |
remote ID type | hostname | IP addressAn identifier assigned to devices connected to a TCP/IP network. | |
NATNetwork address translation - A method that remaps IP addresses by changing network address information. traversal | enabled | ||
ciphersuite (policies) | aes128-sha1-modp2048,3des-sha1-modp1536 | ||
version | IKEv1 | ||
DPD timeouts | enabled (150 sec) | ||
lifetime | 3 hours |
Phase 2 (ESP):
Variable | Supported values | Unsupported values |
---|---|---|
mode | tunnel | transport |
protocol | ESP | AH |
ciphersuite (policies) | aes128-sha1, 3des-sha1 | |
PFS | off | |
lifetime | 60 mins |
Supported ciphers
Each cipher consists of three parts:
- Encryption Algorithm — for example,
aes128
- Integrity Algorithm — for example,
sha1
- Diffie Hellman Groups — for example,
modp2048
Kerio Control supports the following ciphers:
Phase 1 (IKE) - supported ciphers
Encyption Algorithms | Integrity Algorithms | Diffie Hellman Groups |
---|---|---|
aes128 or aes (128 bit AES-CBC) aes192 (192 bit AES-CBC) aes256 (256 bit AES-CBC) 3des (168 bit 3DES-EDE-CBC) | md5 (MD5 HMAC) sha1 or sha (SHA1 HMAC) sha2_256 or sha256 (SHA2_256_128 HMAC) sha2_384 or sha384 (SHA2_384_192 HMAC) sha2_512 or sha512 (SHA2_512_256 HMAC) | 2 (modp1024) 5 (modp1536) 14 (modp2048) 15 (modp3072) 16 (modp4096) 18 (modp8192) 22 (modp1024s160) 23 (modp2048s224) 24 (modp2048s256) |
Phase 2 (ESP) - supported ciphers
Encyption Algorithms | Integrity Algorithms | Diffie Hellman Groups |
---|---|---|
aes128 or aes (128 bit AES-CBC) aes192 (192 bit AES-CBC) aes256 (256 bit AES-CBC) 3des (168 bit 3DES-EDE-CBC) blowfish256 (256 bit Blowfish-CBC) | md5 (MD5 HMAC) sha1 or sha (SHA1 HMAC) aesxcbc (AES XCBC) | none (no PFS) 2 (modp1024) 5 (modp1536) 14 (modp2048) 15 (modp3072) 16 (modp4096) 18 (modp8192) 22 (modp1024s160) 23 (modp2048s224) 24 (modp2048s256) |
Question: I need to connect to an IPSec VPN gateway. For that, I'm trying to use Shrew Soft VPN client, which is available for free. How can I install Shrew Soft VPN client on [insert your Linux distro]?
There are many commercial VPN gateways available, which come with their own proprietary VPN client software. While there are also open-source VPN server/client alternatives, they are typically lacking in sophisticated IPsec support, such as Internet Key Exchange (IKE) which is a standard IPsec protocol used to secure VPN key exchange and authentication. Shrew Soft VPN is a free IPsec VPN client supporting a number of authentication methods, key exchange, encryption and firewall traversal options.
Here is how you can install Shrew Soft VPN client on Linux platforms.
First, download its source code from the official website.
Install Shrew VPN Client on Debian, Ubuntu or Linux Mint
Shrew Soft VPN client GUI requires Qt 4.x. So you will need to install its development files as part of dependencies.
$ sudo apt-get install cmake libqt4-core libqt4-dev libqt4-gui libedit-dev libssl-dev checkinstall flex bison
$ wget https://www.shrew.net/download/ike/ike-2.2.1-release.tbz2
$ tar xvfvj ike-2.2.1-release.tbz2
$ cd ike
$ cmake -DCMAKE_INSTALL_PREFIX=/usr -DQTGUI=YES -DETCDIR=/etc -DNATT=YES .
$ make
$ sudo make install
$ cd /etc/
$ sudo mv iked.conf.sample iked.conf
$ wget https://www.shrew.net/download/ike/ike-2.2.1-release.tbz2
$ tar xvfvj ike-2.2.1-release.tbz2
$ cd ike
$ cmake -DCMAKE_INSTALL_PREFIX=/usr -DQTGUI=YES -DETCDIR=/etc -DNATT=YES .
$ make
$ sudo make install
$ cd /etc/
$ sudo mv iked.conf.sample iked.conf
Install Shrew VPN Client on CentOS, Fedora or RHEL
Similar to Debian based systems, you will need to install a number of dependencies including Qt4 before compiling it.
$ sudo yum install qt-devel cmake gcc-c++ openssl-devel libedit-devel flex bison
$ wget https://www.shrew.net/download/ike/ike-2.2.1-release.tbz2
$ tar xvfvj ike-2.2.1-release.tbz2
$ cd ike
$ cmake -DCMAKE_INSTALL_PREFIX=/usr -DQTGUI=YES -DETCDIR=/etc -DNATT=YES .
$ make
$ sudo make install
$ cd /etc/
$ sudo mv iked.conf.sample iked.conf
$ wget https://www.shrew.net/download/ike/ike-2.2.1-release.tbz2
$ tar xvfvj ike-2.2.1-release.tbz2
$ cd ike
$ cmake -DCMAKE_INSTALL_PREFIX=/usr -DQTGUI=YES -DETCDIR=/etc -DNATT=YES .
$ make
$ sudo make install
$ cd /etc/
$ sudo mv iked.conf.sample iked.conf
On Red Hat based systems, one last step is to open /etc/ld.so.conf with a text editor, and add the following line.
Reload run-time bindings of shared libraries to incorporate newly installed shared libraries:
$ sudo ldconfig
Launch Shrew VPN Client
First launch IKE daemon (iked). This daemon speaks the IKE protocol to communicate with a remote host over IPSec as a VPN client.
Now start qikea which is an IPsec VPN client front end. This GUI application allows you to manage remote site configurations and to initiate VPN connections.
To create a new VPN configuration, click on 'Add' button, and fill out VPN site configuration. Once you create a configuration, you can initiate a VPN connection simply by clicking on the configuration.
Troubleshooting
1. I am getting the following error while running iked.
To solve this problem, you need to update the dynamic linker to incorporate libss_ike library. For that, add to /etc/ld.so.conf the path where the library is located (e.g., /usr/lib), and then run ldconfig command.
$ sudo ldconfig
Verify that libss_ike is added to the library path:
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