Notes on Network Management - Hsanokklis/2023-2024-Tech-journal GitHub Wiki

Network Management Notes

• Proactively managing resources connected to your network and not waiting for problems
• Proactive vs reactive response to many system problems and issues
• systems can be queried about their general health:
  • CPU utilization
  • disk utilization
  • Status
  • Temperature
  • Memory

Various Methods

• SNMP
• Proprietary Agents
• Log Centric systems
• Homegrown

DNS has two ports:

• UDP 53
• TCP 53 (but only between DNS servers)

SNMP

• Simple Network Management Protocol
• Usually the least common denominator for network management
• Version 1 + 2 == not secure (3 is encrypted)
• A community string is basically a password, sent in clear text and defaulted to "public"
• is used to access read-only resources
• SSID is basically a community string
• Version 3 supports encryption, but many legacy devices do not support v3

Database Driven

• Three components
  • managed device
• SNMP service/agent

Ports and Protocols

• 161 for everyone!
• 162 for me and you!