Kde se muzu dozvedet vice o pouziti tcp flags a states?

Prave studuju pf pro openbsd firewall a rad bych se zeptal jestli nekdo nevite kde je nejake dobre vysvetleni pro nasledujici body. Kdy a proc to pouzit. Diky

tcp_flags
Specifies the flags that must be set in the TCP header when using proto tcp. Flags are specified as flags check/mask.
For example: flags S/SA - this instructs PF to only look at the S and A (SYN and ACK) flags and to match if only the SYN flag is "on". 
state
Specifies whether state information is kept on packets matching this rule.
* keep state - works with TCP, UDP, and ICMP.

        * modulate state - works only with TCP. PF will 
generate strong Initial Sequence Numbers (ISNs) for packets 
matching this rule.
        * synproxy state - proxies incoming TCP connectionsto help protect servers from spoofed TCP SYN floods. 
This option includes the functionality of keep state and modulate state.

Jeste bych se take rad zeptal,jestli do TABLES muzu dat take cisla nebo jmena portu? Ted to mam v LISTS

InServicesTCP = "{ smtp, pop3, domain, http, https, imap, 799, 1234, 1194 }"

Dotaz: Kde se muzu dozvedet vice o pouziti tcp flags a states?

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