OpenVPN should work, as long as its standard UDP Port (1194) ist properly redirected to the pfSense box behind the Cisco. The other pfsense on the ADSL (I assume) line should work just fine. Anything further depends on the ip/netmasks used on either side and the mode used for openvpn. But at a first glance I can't see anything that should spoil the fun here - as long as the cisco is fowarding the openvpn-udp packets adressed for the public ip to the pfsense on its transfer-net (wan)
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