|Data type||Range||Default value|
|REG_DWORD||0 | 1||(There is no default value for this entry. The system enters a value when you install or upgrade Windows.)|
Stores a backup copy of the value that was stored in IPEnableRouter when the system was most recently installed or upgraded.
The system uses this entry to determine whether the value of IpEnableRouter changed, and, if requested, to restore the previous value.
Do not delete this entry or change its contents. If you do, you might disable the IP packet routing mechanism.