Shared Firewall. When not require a dedicated firewall, a firewall provides shared nassat free, including the detection and in some cases blocking attacks various kinds of typical protocol TCP / IP: SYN-flooding, ICMP flooding, UDP flooding, port scanning, malformed IP packets, Excessive number of connections from a source, etc. The default is to block most of ports, and can incorporate up to enable those rules 5 necessary.
Alishiriki Firewall. Wakati si zinahitaji firewall ari, firewall hutoa alishiriki nassat bure, ikiwa ni pamoja na kutambua na katika baadhi ya kesi za kuzuia mashambulizi ya aina mbalimbali ya itifaki ya kawaida TCP / IP: syn-mafuriko, mafuriko ICMP, UDP mafuriko, bandari skanning, hitilafu IP pakiti, Utokaji idadi ya muunganiko kutoka chanzo, nk default ni kuzuia wengi wa bandari, na unaweza kuingiza hadi kuwawezesha wale sheria 5 muhimu.