Multicast Packets Prevent Successful Autodisconnect

• Microsoft BackOffice Small Business Server versions 4.0, 4.0a, 4.5

SYMPTOMS

Even though you have configured a dial-up networking connection to your Internet service provider (ISP) for autodisconnect, the modem stays connected to the ISP until you manually disconnect.

CAUSE

This problem occurs because IP multicast packets, such as those for Interior Gateway Routing Protocol (IGRP) or Routing Information Protocol version 2 (RIP2), are being transmitted from the ISP's routers in a shorter time interval than the autodisconnect time setting.

RESOLUTION

To resolve this issue:

1. Contact your ISP and request that the time interval between multicast traffic to your connection be increased or disabled.



2. Decrease the autodisconnect timer value on the computer to a value less than the time interval between the reception of the multicast packets. For additional information, please click the article number below to view the article in the Microsoft Knowledge Base:

   Q138365 How the Autodisconnect Works in Windows

MORE INFORMATION

For more information on IP multicast packets, see RFC1112.

Paper copies of all RFCs are available from the NIC, either individually or on a subscription basis (for more information contact NIC@NIC.DDN.MIL). Online copies are available via FTP or Kermit from NIC.DDN.MIL as rfc/rfc####.txt or rfc/rfc####.PS (#### is the RFC number without leading zeroes).

Additional query words: smallbiz

Keywords : kbnetwork ntras SBS
Version : winnt:4.0,4.0a,4.5
Platform : winnt
Issue type : kbprb