Planning

• Planning A Physical Data Center Rack Cleanup
• 10 cabling tips to keep your data center manageable
• Site Planning Guide for Sun Servers – Rackmounting the ServersInclude some rack & datacenter design tips
• CE Pro – 5 Great Looking Racks
  Some good rack reference in year 2012
• Network Documentation Best Practices: What’s Important & How To Track It
• Data Center Handbook – preview version
• Rack Layout samples from Goole search result

Cabling

• Server Room Cabling: The Best and The Worst
• When data center cabling becomes art

General

• Main Support Page
• Knowledge Base
• WUGspace – WhatsUp Gold Community Forum
• Getting Started Video

Maintenance

• SQL Command to show table disk usage:

  EXEC Whatsup.dbo.TableUsage
  

• SQL Command to trim down database:

  ALTER DATABASE WhatsUp SET RECOVERY SIMPLE;
  DBCC SHRINKDATABASE (WhatsUp, 10);
  DBCC SHRINKFILE (WhatsUp, 10);
  DBCC SHRINKFILE (WhatsUp_log, 1);
  ALTER DATABASE WhatsUp SET RECOVERY FULL;
  

• Rename Server
  • WhatsUp Gold forum discuss on rename server (WUG 14.4) (Tested ok at WUG 2016)
  • 1919: Database connection errors after renaming WhatsUp Gold machine / Could not find server ‘[SERVERNAME]’ in sys.servers error (Official way to rename WUG server)
• 1908: How To: Executing SQL statements against the WhatsUp Gold database (Another support KB link)

Active Script Action

• Idea: although can use script to change device status, it must have way to check how a device is up again. (e.g. should have a resume normal Passive Monitor)
• Moreover, it may confuse if multiple device status are received. (if the multiple down status were triggered by Passive Monitor, it don’t know when is really called “resume normal" – multiple resume passive monitor update? Or only 1 resume passive monitor update?)
• To have Context.GetProperty(“DisplayName") supported for Active Script Monitor

  DeviceID can be obtained by the general Context object with: Context.GetProperty(“DeviceID")

• Trigger device maintenance mode automatically

  Use script function EventHelper.SendChangeEvent to change the device status by a certain event

• Using Powershell to update the state (send state change event) of a device

  Example to use PowerShell to call the SendChangeEvent function (require to use the 32bit PowerShell)

Network Security

• Top 30 Nmap Command Examples For Sys/Network Admins

Network Management

• WhatsUp Gold
  • Compare WhatsUp Gold Editions
  • WhatsUp Gold Product Documentation
  • v16.0 Documentation
  • Online Help
  • WhatsUp Gold configuration backup (v6-v8 only)
• cacti – PHP NMS tool
  • setup Cacti and 1-minute polling
  • Use Cacti to monitor your network latency | Networknet.nl (example article)

Cisco

• CCNA
  • CCNA Routing & Switching – Syllabus
  • CISCO ROUTER模擬器(第一篇)：Dynamips

Networking

• ITU-T Recommendations: Series G
• IEEE 802.3 Ethernet
• Wikipedia: MTU
• Wikipedia: MSS
• Wikipedia: GRE Tunnel
• Cisco: Resolve IP Fragmentation, MTU, MSS, and PMTUD Issues with GRE and IPSEC
• Cisco: Adjusting IP MTU, TCP MSS, and PMTUD on Windows and Sun Systems
• H3C: GRE Introduction
• mturoute: Online MTU checking tool
• Wikipedia: dBmpower ratio in dB reference to 1 mW0 dBm = 1 mW3 dBm = 2 mW-3 dBm = 0.5 mW
• Testing Gigabit network performance (memory to memory transfer) with iperf:Server> iperf -M 100000 -w 64k -l 24k -sClient> iperf -M 100000 -w 64k -l 24k -c [server_ip]
  • RTL8168 (PCI-E) to RTL8169 (PCI), around 500Mbps, realworld at most 30MB/s
  • RTL8169 (PCI) to RTL8168 (PCI-E), around 400Mbps, realworld at most 20MB/s

WAN – Wide Area Network

• Forum: How do I simulate a low bandwidth, high latency environment?
• netem – Linux tool for WAN simulation
• dummynet – a FreeBSD tool to simulate WAN environment
• WANem – WAN Emulator
• MasterShaper – Linux tool to control QoS

3G Data Network

• Netbook + USB Modem 極速上網秘笈 (2008-11-26)Howto speed up 3G network speed with registry tweaks

PON – Passive Optical Network

• Wikipedia: PON – Passive Optical Network
• Wikipedia: IEEE 802.3ah – Ethernet in the First Mile
• Wikipedia: Fiber to the x
• Network Dictionary: PON

xDSL

Tutorials

• Wikipedia – DSL
• Wikipedia – ADSL2+ (ITU G.992.5)
• Wikipedia – DSLAM
• UNH-IOL DSL KnowledgebaseInclude lots of DSL training materials
• DSLFAQ – Broadband Terminology
  • DSLFAQ – Training the line
• Understanding Line Loss and Measurements
• Forum: Interleaved or Fast Path???
• DSL – Understanding Interleaving and LagData Path: Interleaving is at Layer 1, buffered mode, increase stability but also increase delay from 10-40ms
• Attainable Bit Rate (should be the maximum bit rate possible on the line)
• Forum on ADSL default IP and setup
• Example web mgt screen of a ASUS ADSL Modem
• DMT – freeware tool to diagnostic DSL modem statusmatch certain number of DSL modems only

Ethernet

• Squeeze Your Gigabit NIC for Top PerformanceGuidelines for optimization for GbE on different systems