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Citrix ICA Clients must locate the master browser to get the address of a server or published application. The Citrix ICA Client can locate the master browser by sending out broadcast packets, or, if the address of a Citrix server is specified in the Citrix ICA Client or in an ICA file, the ICA Client locates the master browser by sending directed packets to the specified address. The ICA Client requests the address of the ICA master browser from the Citrix server.

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You can use the query server command to discover the Citrix server acting as the master browser. The query server command displays all servers on each network transport (TCP/IP, IPX, and NetBIOS). An M next to the network address of a server indicates that it is the master browser for that network transport.

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In order for Citrix servers or ICA Clients to contact Citrix servers on a different network, an ICA Gateway must be used. An ICA Gateway is established between two networks to allow the master browsers on each network to share information about available Citrix servers and published applications.

The ICA Browser service uses directed packets to exchange information. An ICA Gateway is used to connect the ICA Browser services of Citrix servers on different network subnets. ICA Gateways are used on routed networks such as TCP/IP and IPX.

An ICA Gateway consists of at least two Citrix servers. The local server is responsible for contacting the other network and setting up a link between the master browsers on each network. The remote server is a Citrix server on the other network that communicates with the local server to establish the ICA Gateway. You can store redundant gateway information on different servers to increase reliability by selecting multiple servers.

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To enable ICA Gateways to work correctly, network routers must pass ICA

Browser traffic between subnets.

ICA Gateways on TCP/IP networks use directed UDP datagrams to port 1604. Routers on TCP/IP networks must be configured to route UDP datagrams between network subnets.