Hello, Who Are You, Won't You Tell Me Your Name!
Charly's Column – DNSDiag
If some transactions take an inexplicably long time, you don't have to blame yourself for the delayed transmission of user data. Name resolution issues might be to blame. Sys admin Charly has three tools to study the DNS server.
Pure randomness took me by the hand recently and led me to dnsping
, dnstraceroute
, and dnseval
. The tool collection for name resolution is entitled DNSDiag [1]. You need Python 3 and pip3
to install and run the trio and sudo
to let it create ICMP sockets.
dnsping
lives up to its name, repeatedly querying a DNS server and displaying the response times. The hostname to be resolved is a mandatory parameter. dnsping
prompts you for the system's default name server, which can be changed using -s <nameserver>
. After typing
sudo dnsping.py -v -s 8.8.8.8 linux-magazine.com
[...]
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