Wireshark mailing list archives
Display more digits for NTP packet's root dispersion
From: Martin Burnicki <martin.burnicki () meinberg de>
Date: Mon, 6 Aug 2018 11:19:22 +0200
Hi all, actually the root dispersion field from an NTP packet is only displayed with 4 digits after the decimal point, i.e. 0.1 ms resolution. However, modern NTP servers may provide a better root dispersion. E.g., if only the LSB in the scaled integer of an NTP packet is set then this means ~15 microseconds (0.000015 s) root dispersion, but this is currently displayed as 0.0000 s, even though the real value is *not* 0. The relevant piece of code seems to be the line proto_tree_add_double(ntp_tree, hf_ntp_rootdelay, tvb, 4, 4, rootdelay); in function dissect_ntp_std() in file dissectors/packet_ntp.c. I tried to add this as a feature request to bugzilla, but was unable to register with bugzilla. :-( Martin -- Martin Burnicki Senior Software Engineer MEINBERG Funkuhren GmbH & Co. KG Email: martin.burnicki () meinberg de Phone: +49 5281 9309-414 Linkedin: https://www.linkedin.com/in/martinburnicki/ Lange Wand 9, 31812 Bad Pyrmont, Germany Amtsgericht Hannover 17HRA 100322 Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg, Andre Hartmann, Heiko Gerstung Websites: https://www.meinberg.de https://www.meinbergglobal.com Training: https://www.meinberg.academy ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev () wireshark org> Archives: https://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-request () wireshark org?subject=unsubscribe
Current thread:
- Display more digits for NTP packet's root dispersion Martin Burnicki (Aug 06)
- Re: Display more digits for NTP packet's root dispersion Dario Lombardo (Aug 06)
- Re: Display more digits for NTP packet's root dispersion Martin Burnicki (Aug 06)
- Re: Display more digits for NTP packet's root dispersion Dario Lombardo (Aug 06)
- Re: Display more digits for NTP packet's root dispersion Martin Burnicki (Aug 08)
- Re: Display more digits for NTP packet's root dispersion Peter Wu (Aug 08)
- Re: Display more digits for NTP packet's root dispersion Martin Burnicki (Aug 06)
- Re: Display more digits for NTP packet's root dispersion Guy Harris (Aug 06)
- Re: Display more digits for NTP packet's root dispersion Guy Harris (Aug 07)
- Re: Display more digits for NTP packet's root dispersion Martin Burnicki (Aug 08)
- Re: Display more digits for NTP packet's root dispersion Dario Lombardo (Aug 08)
- Re: Display more digits for NTP packet's root dispersion Martin Burnicki (Aug 09)
- Re: Display more digits for NTP packet's root dispersion Dario Lombardo (Aug 06)