Microsoft KB Archive/137005

= Unable to PING Router On Remote Network From RAS Client =

Article ID: 137005

Article Last Modified on 12/5/2003

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APPLIES TO


 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows 95

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This article was previously published under Q137005





SYMPTOMS
After a Remote Access Service (RAS) client (Windows NT, Windows 95, or a third-party PPP dialer) using the TCP/IP protocol receives an IP address from the Windows NT RAS server, the RAS client (may be a VPN client) is unable to PING the router on the remote network and computers beyond the router.



CAUSE
This issue may be caused by one of the following:
 * If you install a network service in Windows NT after a service pack, then the network service will overwrite the service pack files. -or-


 * Most routers include an address resolution protocol (ARP) cache, which provides IP address to media access control (MAC) address conversion. Some routers (such as Wellfleet) can hold indefinite addresses in the cache by default. If the IP address used by the RAS client has been used on the network by a local area network (LAN) client in the past, the router can hold this IP address and MAC address in its ARP cache. When another client uses this IP address, the router ignore the packet because the MAC address of the new client does not match the MAC address in the ARP cache.



RESOLUTION
To resolve this issue, use one of the following methods:
 * Reapply the latest Windows NT service pack. -or-


 * Check the ARP cache entries on the router. Contact the router manufacturer for more information and router configuration assistance.

The third-party products discussed here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: prodnt subnet

Keywords: kbnetwork KB137005

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