[FS#3749] busybox-ntp failing on specific ISP but ntpd works. (Attachment added)

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - barhom (barhom) 

Attached to Project - OpenWrt/LEDE Project
Summary - busybox-ntp failing on specific ISP but ntpd works.
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - - Device: glinet B1300 router
- Running 21.02

Attached are two pcap files you can open in wireshark.

This issue seems to only affect one Danish ISP, however I think it is worth reporting to see if it can be fixed.
The built in busybox-ntpd does not work (see packet in sysntpd.pcap)

However, if I install ntpdate instead then ntp is able to update (using the same ntp server).
You can see difference in the packets by comparing the two pcap files.

My best bet is that the ISP is blocking specific data in NTPv4 Packets that busybox-ntp is sending.

 


One or more files have been attached.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3749

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