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  1. Redirecting User Email To Google With Postfix

    Note: Now that Google is hosting email domains for free, it has become an interesting alternative for both new and old domains. As always, I've changed the names to protect those affected.

    Transitioning a domain to Google can be an arduous task. Once you have set up the domain with …

  2. Choosing Between RADIUS And TACACS+

    Deciding whether to use <acronym title="Remote Authentication Dial-In User Service">RADIUS</acronym> or <acronym title="Terminal Access Controller Access Control System Plus">TACACS+</acronym> for <acronym title="Authentication, Authorization, Accounting">AAA</acronym> functionality on a Cisco-based network seems straight-forward. After all, if the network uses Cisco, shouldn't the AAA …

  3. Courier Announces Updates

    Sam Varshavchik with the Courier Mail Server project announced updates for all their major software packages including courier-imap, courier-authlib, and maildrop, in addition to the Courier MTA. The major fix common to most packages appears to be the plugging of a memory leak which only came into play once a …

  4. Postfix 2.3 and clamav-milter

    Postfix LogoYou've probably been using Postfix and ClamAV for a long time. Prior to Postfix 2.3, you had to have an AMaViS daemon running to act as the glue between Postfix and ClamAV.

    As of version 2.3, Postfix now supports Sendmail 8 Milter protocol. Now you can cut AMaViS …

  5. Server Naming Conventions

    Every machine needs a name. As soon as the second server is ready to go, the name SERVER no longer seems like a great idea. When deciding how to name servers, there are two primary conventions: functional names and unique names.

    Functional Names

    Functional names take the job assigned to …

  6. UDLD In Radio-Based Metro Ethernet Rings

    <acronym title="UniDirectional Link Detection">UDLD</acronym> is a Cisco protocol designed to detect and disable unidirectional links in Ethernet (fiber or twisted-pair). In the case of a radio-based Metro Ethernet ring, UDLD goes the extra mile in preventing Spanning-Tree loops and user service interruption.

    4 Switches and Spanning-TreeIn this simple network of …

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