Does 192.168.1.20 have a route to the 172.30.20.0/24 network? What is the default gateway of 192.168.1.20? If it is not 192.168.1.254 then that might be your issue. You can run tcpdump from vShield, please see: http://www.vmware.com/pdf/vshield_51_cli.pdf.
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