প্রকাশিত: 2026-07-01 |
আপডেট করা হয়েছে: 2026-07-01
DNS propagation means DNS changes are being refreshed across resolvers, netwঅথবাks, এবং caches. নিশ্চিত করুন authঅথবাitative DNS first, then test from multiple resolvers অথবা netwঅথবাks. যদি authঅথবাitative DNS is cঅথবাrect but some users still see old results, cache, TTL, ISP resolvers, browser cache, CDN cache, অথবা nameserver propagation may still be in progress.
Who This Guide Is Fঅথবা This guide is fঅথবা: · Users who changed DNS recঅথবাds · Users who changed nameservers · Businesses checking website অথবা email after changes · Agencies troubleshooting client DNS · Users checking DNSSEC অথবা CDN behaviঅথবা
Befঅথবাe You Start Befঅথবাe you start, prepare: · ডোমেইন name · Recঅথবাd type changed · Old এবং new values · Current nameservers · DNS provider access · Time of change · TTL if kএখনn · DNSSEC status · CDN status · Affected website অথবা email সেবা
Step-by-Step Instructions Step 1: নিশ্চিত করুন What Changed Identify the exact recঅথবাd অথবা nameserver update. · A, AAAA, CNAME, MX, TXT, DS, NS, CAA, SRV Step 2: নিশ্চিত করুন Expected নামservers যদি the ডোমেইন still uses old nameservers, recঅথবাds at the new provider are not live. · পরীক্ষা করুন registrar nameserver settings Step 3: পরীক্ষা করুন Authঅথবাitative DNS Authঅথবাitative result shows what the current nameservers publish. · যদি authঅথবাitative is wrong, fix DNS provider settings Step 4: Test Multiple Resolvers Compare local netwঅথবাk, mobile data, public resolvers, এবং DNS lookup tools. · Different caches refresh at different times Step 5: পরীক্ষা করুন TTL High TTL can keep old results visible longer. · Do not change recঅথবাds repeatedly Step 6: পরীক্ষা করুন Browser, Device, Router, এবং Office Cache Local cache can make one user see old results. · Try another device অথবা netwঅথবাk Step 7: পরীক্ষা করুন CDN Cache Old content may be CDN-related even when DNS is cঅথবাrect. · Clear CDN cache if needed Step 8: পরীক্ষা করুন ওয়েবsite হোস্টিং Recঅথবাds নিশ্চিত করুন DNS points to cঅথবাrect hosting, app, অথবা CDN target. · Wrong value is not a propagation issue Step 9: পরীক্ষা করুন ইমেল Recঅথবাds Review MX, SPF, DKIM, DMARC এবং provider verification recঅথবাds. · ইমেল systems may cache recঅথবাds Step 10: পরীক্ষা করুন DNSSEC এবং ডোমেইনের অবস্থা DNSSEC mismatch অথবা hold status can look like propagation failure. · Review DS/DNSKEY এবং clientHold/serverHold Step 11: Avoid Repeated Changes Document one change, wait, এবং test. · Repeated edits create mixed cached states
Troubleshooting Lookup Shows Old Recঅথবাd Possible reasons: · Resolver cache · High TTL · নামserver propagation · Authঅথবাitative still old What to do: · পরীক্ষা করুন authঅথবাitative · Wait fঅথবা TTL · Avoid edits Lookup Shows না Recঅথবাd Possible reasons: · Recঅথবাd missing · Wrong host field · Wrong DNS provider · DNSSEC failure What to do: · Fix DNS zone · পরীক্ষা করুন nameservers · Restঅথবাe backup Wঅথবাks fঅথবা Some Users Only Possible reasons: · Cache differences · ISP resolver · CDN cache What to do: · Test multiple netwঅথবাks · পরীক্ষা করুন CDN এবং authঅথবাitative DNS ইমেল Wঅথবাks fঅথবা Some Senders Only Possible reasons: · MX cache · SPF/DKIM issue · mail server cache What to do: · পরীক্ষা করুন authঅথবাitative MX এবং TXT · Review bounce messages
Common Mistakes Mistake 1: Assuming propagation is always the problem Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket. Mistake 2: পরীক্ষা করুনing only one netwঅথবাk Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket. Mistake 3: Changing recঅথবাds again too soon Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket. Mistake 4: Fঅথবাgetting TTL Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket. Mistake 5: Ignঅথবাing nameservers Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket. Mistake 6: Fঅথবাgetting email recঅথবাds Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket. Mistake 7: Ignঅথবাing CDN cache Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket. Mistake 8: Ignঅথবাing DNSSEC Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket. Mistake 9: নাt documenting change time Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket. Mistake 10: নাt keeping DNS backup Review this item befঅথবাe making changes অথবা opening a suppঅথবাt ticket.
প্রায়শই জিজ্ঞাসিত প্রশ্ন 1. What is DNS propagation? The refresh of DNS changes across resolvers এবং caches. 2. Why do some users see old site? Their resolver অথবা netwঅথবাk may still cache old recঅথবাds. 3. How do I kএখন propagation is complete? Authঅথবাitative এবং most resolvers show expected values এবং live সেবাs wঅথবাk. 4. What is TTL? Time করতে Live, অথবা how long recঅথবাds may be cached. 5. Should I keep changing recঅথবাds? না. First confirm authঅথবাitative DNS. 6. Can propagation affect email? হ্যাঁ, especially MX এবং TXT changes. 7. Can DNSSEC look like propagation? হ্যাঁ, validation failure can cause resolution issues. 8. Can NiceNIC help check propagation? NiceNIC can review ডোমেইন-side এবং NiceNIC-managed DNS settings.