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Transcript
30.18 Stateful Firewalls Recall that basic packet filters are stateless. They treat each IP datagram separately and keep no record of datagrams received. Stateful firewalls watch outgoing requests and adapt the filter rules to accommodate the replies. Example: Internal client sends TCP connection request to external WWW server. Stateful firewall records this as the two endpoints of the requested connection: ( IPsource, Portsource, IPdest, 80 ) When the server returns a connection accept the firewall will recognize this as a response to the request, and forward it to the client. This is additional to the packet filter, so actions can still be prohibited, as determined by the administrator. 11
