Towards a resilient NTP configuration in NTP4

doug — Thu, 12 Jul 2007 06:15:51 -0700

NTP 4 introduces some interesting new things that few people seem to know about, are sparsely documented, and are difficult to setup correctly, however they can help with synchronization in the event of total external network failure (even if you don't have a reference time source).

Now, some reference time sources aren't expensive (others are), but sometimes you care more about node-to-node synchronization than you do about absolute time accuracy. One example might be a large computational cluster where, if the network is disconnected from the Internet for a while, or if the primary time source is down, you don't want the individual nodes to drift apart.

NMAP

dklein — Sun, 14 Jan 2007 09:50:04 -0800

Short Description:
Fast enumeration of network services

Home Page:
insecure.org/nmap

Release Date:
Sun, 2007-01-14 10:00

Status:
Active

Long Description:

Nmap is a powerful tool for discovering hosts on a network and enumerating what service they are offering. This can be used to find vulnerable systems, to locate rogue services on your network or simply for a first step in troubleshooting.

League of Professional System Administrators - Protocols

Towards a resilient NTP configuration in NTP4

NMAP