dnstracer: add page

pages/linux/dnstracer.md

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+# dnstracer
+
+> The dnstracer command determines where a DNS gets its information from.
+> More information: <https://manned.org/dnstracer>.
+
+- Find out where your local DNS got the information on www.example.com:
+
+`dnstracer {{www.example.com}}`
+
+- Start with a [s]pecific DNS that you already know:
+
+`dnstracer -s {{dns.example.org}} {{www.example.com}}`
+
+- Only query IPv4 servers:
+
+`dnstracer -4 {{www.example.com}}`
+
+- Retry each request 5 times on failure:
+
+`dnstracer -r {{5}} {{www.example.com}}`
+
+- Display all steps during execution:
+
+`dnstracer -v {{www.example.com}}`
+
+- Display an [o]verview of all received answers after execution:
+
+`dnstracer -o {{www.example.com}}`