Kbase P6721: How to broadcast the WebSpeed Nameserver
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
20/12/2003 |
|
Status: Unverified
GOAL:
How to broadcast the WebSpeed Nameserver
FIX:
UDP broadcasting insulates the client and Unified Broker from having to know the exact host location of the NameServer.
Using the UDP broadcast address the client and Unified Broker can communicate with a NameServer running on any host in the subnet.
There are 2 ways for NameServer UDP broadcasting:
1. using NameServer replication
Example:
Nameservers located on two machines:
- 172.20.0.7 (port 5162) broadcast address 172.20.255.255
- 172.20.16.12 (port 5162) broadcast address 172.20.255.255
The client broadcasts using 172.20.255.255 and port 5162. It uses the unified broker connection returned by the first NameServer that responds.
2. using Nameserver Neighbors
In a typical environment where UDP broadcasting is used, there is at least one NameServer in each subnet where unified Broker exists.NameServer neighbors allow the client to make all of its connection requests using a single NameServer address.
NameServer neighbors are alternate NameServers that you specify as part of a NameServer configuration. When a NameServer receives a connection request from a client that it cannot resolve, it automatically passes the request to the specified NameServer neighbors to attempt the resolution.