If I have understood your setup:
define in network/interfaces the IP for your web server (if not the same as the extern interface).
define in definitions/networks
web_ext as a.b.c.d 255.255.255.255
web_int as 192.168.2.33 255.255.255.255
define in network/DNAT
web_ext HTTP web_int HTTP
define in network/SNAT
web_int HTTP Any web_ext
finally in packet filter / rules
any HTTP web_int allow
I think this should work, if not please don't flame me as I'm asking a million questions in this BB myself.
good luck
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