If I use this setting on the DMZ firewall would it affect a web server
running in the DMZ behind the FW ? The web server IP/port would be
redirected into the DMZ by natd,  or does this only break SYN+FIN if the
web server is running on the same box ?

As stated in LINT:
# TCP_DROP_SYNFIN adds support for ignoring TCP packets with SYN+FIN.
This
# prevents nmap et al. from identifying the TCP/IP stack, but breaks
support
# for RFC1644 extensions and is not recommended for web servers.
#
options         TCP_DROP_SYNFIN         #drop TCP packets with SYN+FIN

Thanks, Jon.
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