EnableICMPRedirect
Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2
HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
| Data type | Range | Default value |
|---|---|---|
REG_DWORD |
0 | 1 |
1 |
Description
This parameter controls whether Windows Server 2003 alters its routing table in response to Internet Control Message Protocol (ICMP) messages that instruct it to direct datagrams for the recipient along a different route.
Activation Method
You must restart the computer for changes to this entry to take effect.
Notes
ICMP provides a means by which a host sending IP datagrams can be informed about delivery issues. ICMP does not guarantee delivery of IP datagrams (that kind of error correction is left to higher level protocols, like TCP), but rather, it allows network devices, like a router, to tell a sending computer about delivery errors, to suggest shorter routes to a destination, and to assist in probing the network. For more information about ICMP, see RFC 792 Internet Control Message Protocol, and RFC 1122 Requirements for Internet Hosts—Communication Layers.
Windows Server 2003 accepts redirection messages from any host in the route between this computer and the destination computer, and not just first-hop routers. Accepting redirection from only first-hop routers causes problems in some scenarios involving Routing & Remote Access Service (RAS).