PA vs PS

[fred jones <apc235 () hotmail com>]

I'm having trouble with PA and PS options.

Regardless of whether I use PA or PS (as either a super user or normal) both send only a SYN flag. I was under the 
impression that PA was supposed to set an ACK flag, but no matter what I try it still only sets a SYN flag.

I'm using variations of:

sudo ./nmap -v -PA 192.168.1.1 -p80

I've tried this on both os x, and slackware. Sorry for such a newbie question, but google and the man page have not 
been of much assistance. Thanks.

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