Cannot sync network time (NTP) on Win10 on BSNL FTTH

[MrGordon]

I've been using Macs mostly and recently installed Windows 11 on a spare PC. Was running into the exact same issue and didn't even think once that it could be BSNL related. I was going through the different troubleshooting steps trying to identify the problem, and then BSNL connection dropped for some reason and traffic started being routed through my backup internet. Coincidently I tried doing a sync from the UI and it synced right away.

Came across this thread while searching on Google.

This would mean BSNL users using Windows (which is a considerably big number) would have issues with NTP sync? Wow!

 

[MrGordon]

Ended up adding a rule to translate the src port on my Mikrotik router. Works fine now.

 0    ;;; NTP Windows Workaround (BSNL)
      chain=srcnat action=masquerade to-ports=60000-61000 protocol=udp src-port=123 log=no log-prefix=""

 

[JB701]

yep problem is though that its not possible on most consumer routers.

 

[Hiyansh25]

same issue bsnl ftth but when i connect pf sense my old pc as a pf sense it works

 

[!!..PD..!!]

I think that the sync works on ipv4/ipv6 and NTP is blocked on v4. It was months ago that I noticed this issue but it got fixed via Ipv6. Try it once.