![]() ![]() ![]() ![]() In this case, the client was 172.16.8.58, requesting the name “” to the local DNS server 172.16.1.12. In this particular case, you notice a DNS performance problem at 14:04.īy clicking on this peak, you can then see which client has been impacted as well as the DNS resolution processes that were involved: With SkyLIGHT PVX, troubleshooting DNS performance is as simple as viewing the global DNS performance dashboard: Global DNS performance dashboard This can have an impact on overall network and application performance as the client will not take advantage of extra features such as caching supported by the local DNS server. Instead of using the local network, each DNS request traverses the whole Wide Area Network (WAN), which adds latency.īypassing the local DNS server by using external DNS services is also often encountered in production environments. In complex multi-site architectures, it’s not uncommon that clients use remote DNS servers. In enterprise environments, each client’s TCP/IP stack is normally configured to use a local DNS server. Which DNS processes are unsuccessful and why? No answer? Specific problems encountered?.Are successful DNS processes performant enough according to the baselines?.Are the DNS processes successful? Always? For each user and request name?.When troubleshooting DNS performance issues, it’s important to quickly assess DNS query processes: The client does not receive an answer from the DNS server.DNS request has been received by the DNS server but has not been processed properly and the client gets an error message.The result of a DNS query can fall into one of the following categories: The drawback of adding this process in an end-to-end application chain is that it can have disastrous performance impacts in case this process does not perform properly due to DNS protocol errors. ![]() As explained in the first article, this provides much more flexibility compared to working with fixed IP addresses. Many applications perform name resolution through DNS queries. This is the third and final article of a series ( article 1, article 2) covering some important aspects of the DNS protocol for troubleshooting application performance issues. ![]()
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