HP 1032 ClusterPack V2.4 Tutorial - Page 41
ClusterPack, Installation and Configuration of Optional, Components
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Installation and Configuration of Optional Components ClusterPack Installation and Configuration of Optional Components Index | Administrators Guide | Users Guide | Tool Overview | Related Documents | Dictionary 1.3.1 HP-UX IPFilter 1.3.2 External /home File Server 1.3.3 Adding Head Nodes to an ClusterPack cluster 1.3.4 Set up TCP-CONTROL 1.3.1 HP-UX IPFilter Introduction to NAT (Network Address Translation) Network Address Translation (NAT) or IP aliasing provides a mechanism to configure multiple IP addres in the cluster to be presented as a single image view with a single external IP address. The importance of this is two-fold: 1. Single point of "controlled" access to all of the cluster nodes. Network Address Translation allows communications from inside the cluster to get out, without allowing connections from outside to get in. NAT rewrites the IP headers of internal packets going out, making it appear that they all came from a single IP address (which is the external IP address of the entire cluster). Reply packets coming back are translated back, and forwarded to the appropriate Compute Node. Thus, the Compute Nodes are allowed to connect to the outside world, if needed. However, outside machines cannot initiate any connection to individual Compute Nodes, since they are exposed only to the "translated" IP address of the entire cluster. 2. Simplified network administration. The administrator can add or delete nodes to/from the cluster Compute Nodes without any impact to the external world. Further, the administrator can have the all the Compute