Diameter Signaling Router (DSR) : How To Determine if Domain Name System (DNS) Port 53 is Open Between DSR Servers
(Doc ID 2357530.1)
Last updated on OCTOBER 02, 2019
Applies to:Oracle Communications Diameter Signaling Router (DSR) - Version DSR 7.1.0 to DSR 8.2.0 [Release DSR 7.0 to DSR 8.0]
When preparing for a software upgrade or preparing to execute 'Accept Upgrade' step at the conclusion of software upgrade activities on the Oracle Communications Diameter Signaling Router (DSR) [and/or Subscriber Data Server (SDS) for Full Address Based Resolution (FABR)], it is important to ensure that Domain Name Server (DNS) traffic can traverse between and among all servers in a DSR system.
DNS traffic is used to resolve hostname-to-IP Addressing, and traverses IP networks using port 53 on both TCP and UDP. For DSR release 7.1 and above, hostname resolution is achieved exclusively using DNS. Therefore, software upgrades that come from a release prior to DSR 7.1 and upgrade to release 7.1 or later will encounter problems if hostname resolution via DNS is not successful.
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