They also can be used in security investigations to determine abnormal DNS behavior, a problem that's been making headlines lately.

Then you can use the filter: ip.host hostname Wireshark IPv6 Filter ipv6.addr fe80::f61f:c2ff:fe58:7dcb Wireshark Kerberos Filter kerberos. In the video below, I use a trace file with DNS packets show you how to filter for a specific DNS transaction as well as how to add response time values as a column.Įither technique can help document current performance metrics or aid in seeing patterns within DNS. To make host name filters work you need to enable DNS resolution in the settings under View -> Name Resolution. In short, if the name takes too long to resolve, the webpage will take longer to compose. When clients report poor internet response times, you should verify that DNS is operating efficiently. For example, we type into our address bar and the webpage simply appears. You must also consider additional protocols your application depends on for proper operation.įor example, Domain Name System (DNS) is one of those name resolution protocols we all take for granted. To troubleshoot SXL queries, it is useful to capture DNS packets sent and received from the SXL servers of Sophos and look at their values. This includes more than the usual ones like IPv4, IPv6, TCP, TCP, and HTTP. I’ve been using and training network analysts how to use Wireshark for more than 10 years, and enjoy sharing tips and tricks to make your life easier.Īs a protocol analyst, you should be aware of the protocols your applications use.

When you get to the task of digging into packets to determine why something is slow, learning how to use a network analysis tool effectively is critical.

Wireshark filter dns name