tcpv4vsv6
It is recommended to run either TCP IP V4 or V6, not BOTH.
This is an issue with the internals of OA and using the TCP stack for all communications. While the OS usually handles these requests, we have seen instances where the software bounces between V4 and V6 and the system is not as stable as it with just V4.
Most plant networks are Class C or Class B anyway on V4. For an OA computer to really be a public TCP IP address on the internet and require a V6 address, is very rare. I would recommend that we run OA networks on V4 only.
reference: SIMATIC_WinCC_OA_Security_Guidelines
To totally disable IPv6 or to prefer IPv4, here is the windows register changes required:
- open regedit
- navigate to the following key…
- Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters
- Add DWORD entry here…
- HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\
- Name: DisabledComponents
- Type: REG_DWORD
- Value can be set to 32 (0x20 prefer IPv4 over IPv6)
- Value can be set to 255 (0xFF disable all IPv6 components)
tcpv4vsv6.txt · Last modified: 2019/11/26 02:22 by toddmalone