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Unless you have a expressed a wish to the contrary, your system is
only available by logging onto the front end server. The compute nodes
are configured using private LAN addresses which are completely invisible
to the Internet or your other networks. In addition a network firewall and
tcp wrappers package is enabled by default. The default access is to allow
unlimited access between the compute nodes and the front end server. Access
from the external network to the front end server is restricted to
Secure Shell logins.
Additionally the compute
nodes are all able to access the external network. e.g to send mail or
set clocks using your time servers, mount external network file systems etc.
This configuration provides a high degree
of security against unauthorised use and network break ins. Should you wish
to modify your firewall, please consult the appropriate section in the
System Administration chapter.