The forwarding buffer used to route packets between interfaces can consume all
available kernel memory in NT 4 SP4. The default is 0xFFFFFFFF. Microsoft
recommends setting:
Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services\Tcpip\Parameters
Name: MaxForwardBufferMemory
Type: REG_DWORD
Value: 74240
Name: MaxNumForwardPackets
Type: REG_DWORD
Value: 50
See KB Q221926 for updated information.