ZyXEL P-663H-51 is an all-in-one ADSL2+ gateway for Home, SOHO and SMB applications. Featuring two ADSL2+ WAN ports and four 10/100Mbps Ethernet LAN ports, the P-663H-51 provides SPI (Stateful Packet Inspection), anti-DOS (Denial of Service) and many Firewall security features to protect against network intrusion and attacks. In addition, advanced features such as IP multicasting, IGMP proxy/snooping, fast leave and IP QoS fulfill the need of triple-play services, while the G.bond-based port bonding feature groups the 2 ADSL2+ physical ports into a logical link. The link not only provides VDSL-equivalent bandwidth with much longer loop length, its load-balance feature between the two ports also makes P-663H-51 the best choice for business and high-end market applications.