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