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content/notes/25-network-security-2.md
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@ -118,8 +118,18 @@ three types
limitaitons
- IP spoofing
- if multiple apps need special treatment, each has own app. gateway
- client software must know how to ocnt
- client software must know how to contact gateway
- e.g., must set IP of proxy in browser
- filters oftenuser all or nothing policy for UDP
- tradeoff: access with security
# IDS
- instrusion detection system
- deep packet inspection
- look at contents (e.g., check strings in packet against DB of known virus, attack strings)
- examine correlation among packets
- port scanning
- network mapping
- DoS attack
# IDS
multiple IDSs: different types of checking at different locations