Network security provider Stonesoft today announced that its Firewall/VPN 5.3 solution has passed the VPN Consortium's (VPNC) Internet Protocol version 6 (IPv6) testing criteria. This certifies that the most recent version of Stonesoft's Firewall/VPN meets the interoperability requirements for supporting the IPsec VPN standards set forth by the Internet Engineering Task Force (IETF).