The DR-250 is based on the very latest ADSL2/2+ platform, supporting the fastest broadband speeds available. ADSL2 offers considerable performance benefits over standard ADSL, including improved range and data rate. The DR-250 has an integral four port Ethernet switch and a 25 pin RS-232 serial interface for local connectivity. The DR-250 router has an integrated stateful inspection firewall and can support 20 IPSEC VPN (Virtual Private Network) terminations which can be secured using DES, 3DES, AES encryption and MD5 or SHA1 key exchange protocols. These features ensure that the remote sites can use the latest security technology to resist denial of service and hacking attacks. The VPN’s can be used as a way of increasing security and to create secure tunnels, running between sites. The VPNs can be used to interconnect sites effectively replacing the requirement for dedicated leased lines. A VPN tunnel can be established between any of the DR or MR series routers. Alternatively VPN’s can be created between the DR-250 and a third party router.