Microsoft KB Archive/163374

= Arp May Not Use Specified Source IP Address =

Article ID: 163374

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51
 * Microsoft TCP/IP for Windows for Workgroups 3.11
 * Microsoft TCP/IP for Windows for Workgroups 3.11a
 * Microsoft TCP/IP for Windows for Workgroups 3.11b
 * Microsoft Windows 95

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This article was previously published under Q163374



SYMPTOMS
Arp.exe will not use a specified source IP address when there are multiple IP addresses from the same subnet assigned to the same network adapter.



CAUSE
Microsoft's TCP/IP implementation uses the first IP address that is assigned to the network adapter when there is more than one IP address for the same subnet. This is by design.

RFC 826 does not cover specifying a source IP address when there is more than one IP addresses assigned to the same network adapter.



RESOLUTION
Arp does use the specified IP address when there are multiple network adapters, each with an IP address on the same subnet.

Keywords: kbbug kbusage KB163374

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