MDLog:/sysadmin

The Journal Of A Linux Sysadmin

HowTo Use Dig to Check if a DNS Server Is Using Random Source Ports

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You can quickly test with dig if a DNS resolver is using random source ports for queries:

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dig +short @<IP_DNS_SERVER> porttest.dns-oarc.net txt

for more details check out my post about this: ”How to check if your DNS server implements source port randomization

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