Bridges and routers

Article:TECH106518  |  Created: 1996-01-12  |  Updated: 2005-01-02  |  Article URL
Article Type
Technical Solution



This document describes some common issues you might experience when calling over a bridge or router to connect with a host on another LAN (within a WAN). This information is most useful, however, to a LAN administrator for troubleshooting.


When using pcAnywhere on a network, the standard troubleshooting procedures apply. Find out whether you can do the following:
  • Can you connect to a host on the LAN without going over a bridge or router?
  • Can the users on the other side of the bridge or router establish a connection between a host and remote without going over the bridge or router?

If you cannot do either of the above, correct the problem before trying to use a bridge or router.

If you can do both, check the following:
  • Is the bridge or router configured to filter SAP (service advertising protocol) packets?
  • Is there excessive information flowing over the bridge or router (a possible congestion problem)?
  • Are you trying to connect through multiple bridges or routers?

pcAnywhere sends SAP packets over the network at about one per minute. The SAP packet shows the pcAnywhere remote that a host is waiting for a connection.

Many programs use SAP packets for various services on the network. Sometimes you need to set up the bridge or router to filter SAP packets on larger networks. This is to cut down on the traffic across the network. Be sure SAP packet filtering is off when using pcAnywhere to call over a bridge or router. If you must use SAP packet filtering for security purposes, at least ensure there is no packet filtering for pcAnywhere's packet.

pcAnywhere's SAP packet ID is as follows:
decimal: 152
hex: 98
size: Not greater than 500 bytes

Disconnects and timeouts related to congestion are often related to the time pcAnywhere waits to receive a response from the host or remote. If the bridge or router you use is extremely busy (serving a large network), you could experience disconnects because of timeouts.

To test for this, connect when the network is not very busy. Trying a different bridge might help.

Multiple bridges or routers
Multiple bridges and routers can cause a delay that might disrupt a connection.

Cisco routers
If you are using a Cisco router, add some configuration settings other than the "Allow all SAP packages" option. The Cisco router has several settings for SAP packets. SAP packets must be enabled for both servers and networks. These are two separate options that you must turn on; in many situations, only the server option is enabled.

For additional information, refer to the following documents:

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