Download Protowall is a free security software includes  NDIS IP filter that functions independently in harmony with a personal firewall.

Protowall is the brainchild of Dudez , the coder and has a definite edge over other similar security software tools. Protowall runs in the background occupying minimal memory space and yet blocking thousands of bad IP addresses. Protowall is a driver-based firewall, blocking packets at the system level itself. Protowall achieves this via a low-level driver that filters network traffic, most importantly TCP/IP and UDP both of are essential for file-sharing. Even while doing so it takes up veryminimal memory space and safely runs in the background, allowing you to continue with your work. Its only function is to block large amounts of IP addresses.

Protowall Capabilities:

• Powerful Driver which blocks packets
• Blocks IP Addresses which are NDIS Protocols
• Has a GUI as a Driver Instructor
• Blocks both inbound and outbound packets
• Blocklist Manager handles all unwanted traffic
• Free of Spyware
• Freeware

Protowall blocks all NDIS protocols. These include:

IP/ICMP/TCP/UDP/HOPOPTS/IGMP/GGP/IPV4/ST/EGP/PIGP/RCCMON/NVPII/PUP/ARGUS/
EMCON/CHAOS/MUX/MEAS/HMP/PRM/IDP/TRUNK1/TRUNK2/LEAF1/LEAF2/RDP/IRTP/TP/
BLT/NSP/INP/SEP/3PC/IDPR/XTP/DDP/CMTP/TPXX/IL/IPV6/SDRP/ROUTING/FRAGMENT/
IDRP/RSVP/GRE/MHRP/BHA/ESP/AH/INLSP/SWIPE/NHRP/MOBILE/TLSP/SKIP/ICMPV6/NONE
/DSTOPTS/AHIP/CFTP/HELLO/SATEXPAK/KRYPTOLAN/RVD/IPPC/ADFS/SATMON/VISA/IPCV/
CPNX/CPHB/WSN/PVP/BRSATMON/ND/WBMON/WBEXPAK/EON/VMTP/SVMTP/VINES/TTP/IGP/DGP/
TCF/IGRP/OSPFIGP/SRPC/LARP/MTP/AX25/IPEIP/MICP/SCCSP/ETHERIP/ENCAP/APES/GMTP/IPCOMP/
PIM/PGM/