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Doc ID: 578524.1
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Note: It is very important to use entire address string in order to configure dispatchers on RAC and host name used in it should be a VIP hostname, otherwise connection may suffer intermittent ORA-12545 errors. Refer metalink note <333159.1>
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alter system set dispatchers='(address=(protocol=tcp)(host=node1-vip))(dispatchers=2)' scope=both   sid='racdb1';
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If you have a firewall present between client and the server, then it may block connections on the randomly selected dispatchers ports. If this is the case for your setup then set the dispatcher with PORT clause as below and configure the firewall to allow the communication on these ports along with the listener port.
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alter system set dispatchers='(address=(protocol=tcp)(host=<vip address>)(port=<port_number>))' scope=both sid='racdb1';
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Note - If the port clause is not used in the dispatchers configuration then port numbers will be chosen randomly which could be blocked in the firewall resulting redirected connection to dispatchers getting time out errors. For more details refer note <125021.1>:Oracle Connections and Firewalls
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