Billion Electric Company 800VGT manual L2TP over IPSec L2TP/IPSec VPN Connection

Billion 800VGT Router

PPPAuthentication Type: Default is Auto. Use this setting if you want the router to determine which authentication type to use. You can manually specify CHAP (Challenge Handshake Authentication Protocol) or PAP (Password Authentication Protocol) if you know which type the server is using (when acting as a client) If the router is acting as a server enter the authentication type you want clients connecting to you to use. When using PAP, the password is sent unencrypted, whilst CHAP encrypts the password before sending, and also allows for challenges at different periods to ensure that the client has not been replaced by an intruder.

Idle Time: When there is no activity on the connection for this pre-determined Idle time, the VPN connection is Auto-disconnected. 0 means this connection is always on. Click Apply after changing settings.

L2TP over IPSec (L2TP/IPSec) VPN Connection

IPSec: Enable this setting to enhance your L2TP VPN security.

Authentication: Authentication establishes the integrity of the datagram and ensures it is not tampered with during transmission. There are three options, Message Digest 5 (MD5), Secure Hash Algorithm (SHA1) or NONE. SHA-1 is more resistant to brute-force attacks than MD5, however it is slower.

￿MD5: A one-way hashing algorithm that produces a 128−bit hash.

￿SHA1: A one-way hashing algorithm that produces a 160−bit hash.

Encryption: Select your encryption method choice from the pull-down menu. There are four options, DES, 3DES, AES and NONE. NONE means that the connection is a tunnel only, with no encryption. 3DES and AES are more powerful but increase latency.

￿DES: Stands for Data Encryption Standard, and uses a 56 bit encryption method.

￿3DES: Stands for Triple Data Encryption Standard, and uses a 168 (56*3) bit encryption method.

￿AES: Stands for Advanced Encryption Standards, and uses a 128 bit encryption method.

Perfect Forward Secrecy: Choose whether to enable PFS, using Diffie-Hellman public-key cryptography to change encryption keys during the second phase of VPN negotiation. This function provides better security, but extends the VPN negotiation time. Diffie-Hellman is a public-key cryptography protocol that allows two parties to establish a shared secret over an unsecured communication channel (i.e. over the Internet). There are three modes, MODP 768-bit, MODP 1024-bit and MODP 1536-bit. MODP stands for Modular Exponentiation Groups

Pre-shared Key: This key is for Internet Key Exchange (IKE) protocol and is a string of between 4 and 128 characters. Both sides should use the same key. IKE is used to establish a shared security policy and it authenticates keys for services (such as IPSec) that require a key. Before any IPSec traffic can be passed, each router must be able to verify the identity of its peer. This can be done by manually entering the pre-shared key into both sides of the connection (router or hosts).

Remote Host Name (Optional): Enter hostname of the remote VPN device. This is a tunnel identifier and should match the Remote VPN device hostname. If it matches the tunnel will be connected; otherwise, it will be dropped.

Caution: This setting is only for when the router functions as a VPN server. This option should be used by advanced users only.

Local Host Name (Optional): Enter the hostname of the Local VPN device that establishes the VPN tunnel. By default, the Router’s default Hostname is home.gateway.

Tunnel Authentication: This enables the router to authenticate both the L2TP remote client and L2TP host. This is only valid when the L2TP remote client supports this feature..

Secret: The secure password length should be 16 characters (This may include numbers and/or characters.)

Click Apply after changing settings.

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Chapter 4: Configuration