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Application Links (cont.)
- Psionic Portsentry - A host-based IDS, it watches for, and optionally responds to portscans. If it detects a portscan against the machine, it can optionally block that host through tcp_wrappers, blocked routes and firewall rules. Care should be taken in using firewall rules and blocked routes, since most scanners can spoof up to about a dozen sites, setting up a denial of service situation.