User`s guide

1 Cloud Computing
1-12
123.123.0.0/16
Caution Make your address formats as strict as possible, using as many fields and bits
as you can. Address formats that are too open can increase the risk of unauthorized
access to your cluster. A format that uses no bits for matching (e.g., 0.0.0.0/0, or
123.123.234.56/0) allows all machines on the Internet to access your cluster.
The computer you are currently accessing the Cloud Center from is automatically added
to the access list.
To add machines to the allowed listing, add the IP address or range in the blank field and
click Add. To remove an allowed address, click Remove next to the address in the list.
You can have up to eight rules in your list; if you already have eight when you add a rule,
the oldest is deleted.
The list is saved between sessions, and is the same for all login names that share the
same AWS account. (See also “Server Sockets Accessed by Client” on page 1-13 for
information about port usage.)
When you start a cluster, Cloud Center creates a security group called
mdcs_cluster_node if it does not already exist. Whether the group already exists
or is new, Cloud Center then opens the necessary ports for cluster communications.
Depending on your own client security settings, you might need to add firewall access
rules to this security group.