NOTE about disabling RDNS for SmartFilter: "Disabling reverse DNS prevents SmartFilter from correctly classifying some sites and can increase the likelihood of the ProxySG appliance serving inappropriate content." Because removing RDNS can negatively affect site classification, please use judgement when disabling RDNS for SmartFilter. To disable SmartFilter's RDNS, please do the following steps:Ģ.) Go to the Configuration tab > Content Filtering > Third-Party Databases > SmartFilter tabģ.) Remove the check next to Allow RDNS and click on the Apply button. If you are running the SmartFilter content filter, it is possible that the RDNS lookup is being initiated by SmartFilter. SMARTFILTER CONTENT FILTER MAY CAUSE RDNS TO OCCUR Here are a few other things to check for: If you have done the above changes and from a packet capture you determine that RDNS is still occurring, there are other potential configuration issues that may be affecting it. When finished, click on the Close button. Click on the Add button.ĥ.) Enter in the host or subnet and click on the Add button. To do that, please do the following items:Ģ.) Go to the Configuration tab > Policy > Visual Policy Manager > Launchģ.) With the Visual Policy Manager window open, click on Configuration > Set Reverse DNS Lookup Restrictions.Ĥ.) In the DNS Lookup Restrictions, change the default of None to Listed host patterns. ![]() ![]() If you suspect that RDNS is failing or taking a long time to occur, you can restrict RDNS lookups occurring on the ProxySG. At the end of this article, there will be links to other articles for possible performance problems in case your issue is not an RDNS issue. This document will focus on reverse DNS (RDNS) as the main problem and the steps that can be taken to identify RDNS as the problem. Slow web site access or slow video access can be a symptom of many different things.
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