HP 1032, Руководство пользователя

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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