IP Set Up

CA Directory works across an IP network and requires that the following IP related features are in place:

Firewall access for ports used for multiwrite
Any firewall between hosts must allow bidirectional access to the ports used for DSAs to send and receive multiwrite access.

If you run DXmanager, be aware of the following IP requirements.

Static and dynamic IP addresses
Because DXmanager refers to DSA hosts by their DNS name, the hosts can have dynamic IP addresses.

DXmanager host must have a static IP address.
Firewall access for ports used by DXmanager and dxadmind
Any firewall between the DXmanager host and a DSA host must allow bidirectional access to the ports that DXadmind uses. By default this is port 2123.
Host names resolution to network wide IP addresses
On UNIX machines some host files have an entry that gives the host name of a machine as a local address. For example if the host name is host1, then the entry might appear as:
```
 127.0.0.1 host1
```
This causes the DSA to fail. Provide the global IP address of the host or use DNS to resolve the host name.
Reverse DNS if you use host names
If you specify the DXmanager host to a DSA host in terms of its host name, then you need to have reverse DNS enabled. When the DXmanager sends a message, DXadmind needs reverse DNS to match the message's source IP address to the host name that you provided.