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IDS

IDS. Mike O’Connor Eric Tallman Matt Yasiejko. Overview. IDS defined What it does Sample logs Why we need it What it doesn’t do Setup Alternatives. IDS defined. IDS = Intrusion Detection System Cisco IDS-4215 Placed on the switch IDS vs IPS IDS = detection; “passive”

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IDS

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  1. IDS Mike O’Connor Eric Tallman Matt Yasiejko

  2. Overview • IDS defined • What it does • Sample logs • Why we need it • What it doesn’t do • Setup • Alternatives

  3. IDS defined • IDS = Intrusion Detection System • Cisco IDS-4215 • Placed on the switch • IDS vs IPS • IDS = detection; “passive” • IPS = prevention; “active” • Signature driven (misuse detection)

  4. IDS defined • Used to detect traffic not captured by conventional firewalls • Network vs. Host IDS • Network = examines traffics and monitors multiple hosts • Host = analyzes system calls, file modifications, etc • Misuse (signature based) vs. anomaly (self-learn)

  5. What it does… • Analyzes network traffic that has been sent to or from FA 0/24 • Uses signature database to identify problematic traffic • Custom signatures may be added • False positives are quite possible • DNS requests • IP logging, block IP, allow IP, etc • Detects port scans

  6. DNS request logged

  7. Signature 4003 details

  8. Port scan detected

  9. Why we need IDS • Nmap sweeps • Vulnerability sought constantly • Many attack types • Above is one type of TCP sweep (SYN packets)

  10. What our IDS doesn’t do • Intrusion Prevention!! • The administrator must take action • Does not log traffic that does not pass through FA 0/24 • This was a choice • Internal traffic is undetected at this time

  11. Setup • Used CLI for IDS configuration • Setup IP, gateway, name, netmask • Set access list • Console only at the moment (134.198.161.100)

  12. SPAN • Switched Port ANalyzer • Mirrors 0/24 onto 0/23

  13. Monitor session on the switch #configure terminal #monitor session 1 source interface fastethernet 0/24 both #monitor session 1 destination interface fastethernet 0/23 #end

  14. Alternatives • Snort • Software solution to IDS/IPS • Traffic analysis • Packet logging • Detects port scans, buffer overflows, etc • IPS

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