Windows firewall packet filtering

I've been looking for ways to block a particular UDP packet on windows, but need to look into the payload. Something like if (udp[34]==0xaa and udp[45]==0xbb) then PF_DROP.

Are there firewalls/proxies that can do this? The ones I've come across only filter on IP/port. I can do this on linux with iptables but have yet to find a solution on Windows.

I'm open to writing my own app if someone can give me pointers to the windows kernel hooks for packet filtering. Thanks.
zycaAsked:
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theoaksCommented:
yes... ms isa server can do packet level filtering, not just port based.


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jkrCommented:
I am not aware of an existig FW for that purpose, but you could adapt the one presented in http://www.codeproject.com/KB/IP/FwHookDrv.aspx ("An Adventure: How to implement a Firewall-Hook Driver?") to suit your needs. This article comes with full source code.
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jkrCommented:
I'd object against a split, since 'yes [...] a server can do that' is too vague.
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