![]() If the request matches a split DNS domain, An圜onnect allows the request to be tunneled in to the ASA. True Versus Best Effort Split DNS An圜onnect Release 2.4 supports split DNS Fallback (best effort split DNS), which is not the true split DNS found in the legacy IPsec client. In order to force the DNS resolver to try an acceptable DNS server for a request, it is important that split DNS testing is only performed with applications that rely on the native DNS resolver for domain name resolution (all applications except NSLookup, Dig, and similar applications that handle DNS resolution by themselves, for example). An圜onnect does not force the DNS request via a certain interface but allows it or rejects it dependent upon the split DNS configuration. This is because NSLookup does not rely on the OS DNS resolver. Instead, rely on a browser or use the ping command. However, the behaviors that are described in this document can be different, dependent upon the Operating System (OS).Ģ Note: Avoid the use of the NSLookup when you test the name resolution on the client. If you do not have split DNS defined, then all of the DNS queries are sent to the DNS servers that are defined by the ASA. If there are no DNS servers defined on the ASA, then the DNS settings are blank for the tunnel. In all cases, the DNS queries that are defined to move through the tunnel go to any DNS servers that are defined on the ASA. Before this version, you could only do split DNS or standard DNS. Note: The split tunnel all dns command was first implemented in ASA Version 8.2(5). ![]() In the case of a negative response, the DNS queries might also go to the DNS servers that are configured on the physical adapter. Standard DNS All of the DNS queries move through the DNS servers that are defined by the ASA. This setting is configured in the group policy. Tunnel all DNS Only DNS traffic to the DNS servers that are defined on the ASA is allowed. Split DNS The DNS queries that match the domain names that are configured on the Cisco Adaptive Security Appliance (ASA) move through the tunnel (to the DNS servers that are defined on the ASA, for example) and others do not. Split Versus Standard DNS When you use split include tunneling, you have three options for DNS: 1. Contents Introduction Split Versus Standard DNS True Versus Best Effort Split DNS Tunnel All and Tunnel All DNS DNS Performance Issue Resolved in An圜onnect Version 3.0(4235) DNS with Split Tunneling on Different OSs Microsoft Windows Macintosh iphone Related Information Introduction This document describes how different Operating Systems (OSs) handle Domain Name System (DNS) queries and the affects on domain name resolution with Cisco An圜onnect and split or full tunneling. 1 Behavioral Differences Regarding DNS Queries and Domain Name Resolution in Different OSs Document ID: Contributed by Cisco TAC Engineers.
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