Networking

Mail system consists of three servers:

Border SMTP connectivity is managed by a Postfix/BSD based server, implementing ClamAV virus scanning, blacklisting, graylisting and spam assassin classification.

Additional functionality:

• blocked content is available through web interface;
• users are authenticated through Active Directory;
• current mailbox lists (used domain names and user mailboxes) are refreshed on regular basis, using unprivileged AD user and OpenSSH connectivity to refresh mailbox lists from BSD mail server’s MySQL user tables.
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Main mail server – Microsoft Exchange 2003.

How to connect two networks together with a secure tunnel? It’s simple, follow these steps.

Use OpenBSD distro to create encrypted L2 IPSec tunnel between machines.

Terminology: MACRO expr. in use:

All examples are based on OpenBSD 3.7

Configuration tips:

To login into the system without a password request you need to add remote machine public RSA key into the target machine ~/.ssh/authorized_keys Public key location: ~/.ssh/id_rsa.pub This is really useful for remote script execution under the requested credentials.

Creating a simple shaping router using OpenBSD and PF

So to start with, lets complete a simple and straight-forward OpenBSD install:

Create mirror volume using standart FreeBSD 5.4 and later tools (gmirror).