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<h3>
Eric S. Raymond pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/433c44bbf76571e543365b07a9b7e01e907796af">433c44bb</a></strong>
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<span>by Eric S. Raymond</span>
<i>at 2017-01-09T08:05:22-05:00</i>
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<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Begin design notes for NTPv5.
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<h4>2 changed files:</h4>
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<a href="#8a07f8ef10555b2000b881e85dc86b4252e403eb" style="text-decoration: none">
devel/README
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devel/ntpv5.txt
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<h4>Changes:</h4>
<li id="8a07f8ef10555b2000b881e85dc86b4252e403eb">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/433c44bbf76571e543365b07a9b7e01e907796af#8a07f8ef10555b2000b881e85dc86b4252e403eb"><strong>devel/README</strong></a>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -22,6 +22,9 @@ ifdex-ignores::</td>
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<pre style="margin: 0"> <span id="LC22" class="line">make-tarball::</span>
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<pre style="margin: 0"> <span id="LC23" class="line"> Script for building a release tarball.</span>
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<pre style="margin: 0"> <span id="LC24" class="line"></span>
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<pre style="margin: 0">+<span id="LC25" class="line">ntpv5.txt::</span>
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<pre style="margin: 0">+<span id="LC26" class="line"> Design notes towards NTPv5.</span>
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<pre style="margin: 0">+<span id="LC27" class="line"></span>
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<pre style="margin: 0"> <span id="LC28" class="line">packaging.txt::</span>
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<pre style="margin: 0"> <span id="LC29" class="line"> Guidance for binary package builders.</span>
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<pre style="margin: 0"> <span id="LC30" class="line"></span>
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<li id="d294410bda3341a7eeac07460e2389ff2f48ea34">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/433c44bbf76571e543365b07a9b7e01e907796af#d294410bda3341a7eeac07460e2389ff2f48ea34"><strong>devel/ntpv5.txt</strong></a>
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<pre style="margin: 0">+<span id="LC1" class="line">= Preliminary design notes for the NTPv5 protocol =</span>
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<pre style="margin: 0">+<span id="LC2" class="line"></span>
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<pre style="margin: 0">+<span id="LC3" class="line">NTPv4 is showing its age. There are functional capabilities that</span>
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<pre style="margin: 0">+<span id="LC4" class="line">would be very useful if they could be standardized, but are not.</span>
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<pre style="margin: 0">+<span id="LC5" class="line"></span>
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<pre style="margin: 0">+<span id="LC6" class="line">This document will first list these missing bits, then discuss</span>
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<pre style="margin: 0">+<span id="LC7" class="line">ways to incopporate them.</span>
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<pre style="margin: 0">+<span id="LC8" class="line"></span>
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<pre style="margin: 0">+<span id="LC9" class="line">== The missing data: a semantic view ==</span>
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<pre style="margin: 0">+<span id="LC10" class="line"></span>
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<pre style="margin: 0">+<span id="LC11" class="line">=== REFIDs ===</span>
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<pre style="margin: 0">+<span id="LC12" class="line"></span>
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13
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<pre style="margin: 0">+<span id="LC13" class="line">Reference IDs are used by Stratum 1 sources to identify clocks and</span>
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14
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<pre style="margin: 0">+<span id="LC14" class="line">clock types, and by hosts at higher strata to perform loop detection.</span>
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15
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<pre style="margin: 0">+<span id="LC15" class="line"></span>
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16
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<pre style="margin: 0">+<span id="LC16" class="line">The REFID field is 4 octets long, sufficient to hold an IPv4 address</span>
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17
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<pre style="margin: 0">+<span id="LC17" class="line">for loop detection. This is inadequate for IPV6, so the reference ID of</span>
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18
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<pre style="margin: 0">+<span id="LC18" class="line">an IPv6 host is a 4-octet hash of itscactual address. Hash collisions</span>
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19
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<pre style="margin: 0">+<span id="LC19" class="line">have been observed in the wild, possiblty resulting in false-positive</span>
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<pre style="margin: 0">+<span id="LC20" class="line">loop detection.</span>
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21
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<pre style="margin: 0">+<span id="LC21" class="line"></span>
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<pre style="margin: 0">+<span id="LC22" class="line">The new protocol should support REFIDs at least as long as an IPv6</span>
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<pre style="margin: 0">+<span id="LC23" class="line">address (8 octets).</span>
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<pre style="margin: 0">+<span id="LC24" class="line"></span>
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<pre style="margin: 0">+<span id="LC25" class="line">=== Timescale ===</span>
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<pre style="margin: 0">+<span id="LC26" class="line"></span>
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<pre style="margin: 0">+<span id="LC27" class="line">Most servers ship UTC. Some ship TAI. Some perform leap-second</span>
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<pre style="margin: 0">+<span id="LC28" class="line">smearing, some do not.</span>
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<pre style="margin: 0">+<span id="LC29" class="line"></span>
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<pre style="margin: 0">+<span id="LC30" class="line">The new protocol should enable a server to advertise its timescale,</span>
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<pre style="margin: 0">+<span id="LC31" class="line">including its current leapsecond offset.</span>
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<pre style="margin: 0">+<span id="LC32" class="line"></span>
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<pre style="margin: 0">+<span id="LC33" class="line">=== Era ===</span>
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34
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<pre style="margin: 0">+<span id="LC34" class="line"></span>
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<pre style="margin: 0">+<span id="LC35" class="line">NTP dates are 64-bit counters based on an epoch.</span>
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<pre style="margin: 0">+<span id="LC36" class="line"></span>
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<pre style="margin: 0">+<span id="LC37" class="line">The new protocol should enable a server to ship a year identifying its</span>
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<pre style="margin: 0">+<span id="LC38" class="line">epoch.</span>
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39
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<pre style="margin: 0">+<span id="LC39" class="line"></span>
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<pre style="margin: 0">+<span id="LC40" class="line">=== NTS ===</span>
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41
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<pre style="margin: 0">+<span id="LC41" class="line"></span>
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42
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<pre style="margin: 0">+<span id="LC42" class="line">The IETF is attempting to develop a new cryptographic standard for</span>
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43
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<pre style="margin: 0">+<span id="LC43" class="line">secure/authenticated time exchange: Network Time Security.</span>
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44
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<pre style="margin: 0">+<span id="LC44" class="line"></span>
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45
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<pre style="margin: 0">+<span id="LC45" class="line">The new protocol needs to allow a block of data of as-yet unspecified</span>
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46
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<pre style="margin: 0">+<span id="LC46" class="line">and possibly variable size to be dedicated to NTS use.</span>
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47
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<pre style="margin: 0">+<span id="LC47" class="line"></span>
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<pre style="margin: 0">+<span id="LC48" class="line">== Extensions vs. replacement ==</span>
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49
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<pre style="margin: 0">+<span id="LC49" class="line"></span>
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50
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<pre style="margin: 0">+<span id="LC50" class="line">There are three possible scenarios for NTPv5 design.</span>
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51
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<pre style="margin: 0">+<span id="LC51" class="line"></span>
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<pre style="margin: 0">+<span id="LC52" class="line">=== NTPv4+ ===</span>
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53
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<pre style="margin: 0">+<span id="LC53" class="line"></span>
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<pre style="margin: 0">+<span id="LC54" class="line">In this incremental approach, the NTP port number (123) is retained</span>
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55
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<pre style="margin: 0">+<span id="LC55" class="line">and the 48-byte header v4 header is preserved. New data fields are</span>
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<pre style="margin: 0">+<span id="LC56" class="line">passed in RFC7822 extension blocks. The NTP version number is</span>
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57
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<pre style="margin: 0">+<span id="LC57" class="line">not incremented; "v5" becomes a set of required extension blocks.</span>
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58
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<pre style="margin: 0">+<span id="LC58" class="line"></span>
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<pre style="margin: 0">+<span id="LC59" class="line">A difficulty with this approach is that some firewalls and routers are</span>
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60
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<pre style="margin: 0">+<span id="LC60" class="line">known to silently discard RFC7822 extension blocks as a way of</span>
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61
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<pre style="margin: 0">+<span id="LC61" class="line">preventing DoS attacks. This would create propagation issues</span>
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62
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<pre style="margin: 0">+<span id="LC62" class="line">difficult to diagnose.</span>
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63
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<pre style="margin: 0">+<span id="LC63" class="line"></span>
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64
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<pre style="margin: 0">+<span id="LC64" class="line">=== NTPNG ===</span>
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65
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<pre style="margin: 0">+<span id="LC65" class="line"></span>
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66
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<pre style="margin: 0">+<span id="LC66" class="line">In this approach, a new port number is allocated. The protocol is</span>
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67
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<pre style="margin: 0">+<span id="LC67" class="line">design is unconstrained except that it must carry the semantic</span>
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68
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<pre style="margin: 0">+<span id="LC68" class="line">content of the v4 header minus the unused Reference Timestamp</span>
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69
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<pre style="margin: 0">+<span id="LC69" class="line">field.</span>
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70
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<pre style="margin: 0">+<span id="LC70" class="line"></span>
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71
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<pre style="margin: 0">+<span id="LC71" class="line">The principal difficulty with this approach is that getting all the world's</span>
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72
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<pre style="margin: 0">+<span id="LC72" class="line">firewalls to pass through a new port is not easy.</span>
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73
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<pre style="margin: 0">+<span id="LC73" class="line"></span>
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74
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<pre style="margin: 0">+<span id="LC74" class="line">=== Newmode ===</span>
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75
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<pre style="margin: 0">+<span id="LC75" class="line"></span>
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76
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<pre style="margin: 0">+<span id="LC76" class="line">In this approach, the the NTP port number is retained. So is the</span>
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77
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<pre style="margin: 0">+<span id="LC77" class="line">first 32 bytes of the v4 packet header structure, so that the version</span>
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78
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<pre style="margin: 0">+<span id="LC78" class="line">number and packet mode are at the same offset as in v4. The version</span>
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79
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<pre style="margin: 0">+<span id="LC79" class="line">field *is* incremented to 5.</span>
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80
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<pre style="margin: 0">+<span id="LC80" class="line"></span>
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81
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<pre style="margin: 0">+<span id="LC81" class="line">The following payload is design is unconstrained except that it must</span>
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82
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<pre style="margin: 0">+<span id="LC82" class="line">carry the semantic content of the v4 header minus the unused Reference</span>
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83
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<pre style="margin: 0">+<span id="LC83" class="line">Timestamp field.</span>
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84
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<pre style="margin: 0">+<span id="LC84" class="line"></span>
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85
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<pre style="margin: 0">+<span id="LC85" class="line">implementations might not reject Version 5 packets, and therefore</span>
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86
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<pre style="margin: 0">+<span id="LC86" class="line">mis-parse the header. NP Classic and NTPsec *do* perform this check.</span>
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87
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<pre style="margin: 0">+<span id="LC87" class="line"></span>
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88
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<pre style="margin: 0">+<span id="LC88" class="line">== Payload format design for the NTPNG and Newmode cases ==</span>
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89
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<pre style="margin: 0">+<span id="LC89" class="line"></span>
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90
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<pre style="margin: 0">+<span id="LC90" class="line">NTP is running out of version numbers. The version field is only 3</span>
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91
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<pre style="margin: 0">+<span id="LC91" class="line">bits wide. Accordingly, the Newmode payload should be structured like</span>
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92
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<pre style="margin: 0">+<span id="LC92" class="line">PNG, as a sequence of self-describing chunks that can be retired and</span>
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93
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<pre style="margin: 0">+<span id="LC93" class="line">replaced as needed to change payload semantics.</span>
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94
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<pre style="margin: 0">+<span id="LC94" class="line"></span>
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95
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<pre style="margin: 0">+<span id="LC95" class="line">Though NTPNG is not constrained by the width of the v4 mode field,</span>
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96
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<pre style="margin: 0">+<span id="LC96" class="line">the versionless semantics of a PNG-style chunk stream would confer a</span>
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97
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<pre style="margin: 0">+<span id="LC97" class="line">desirable degree of flexibility.</span>
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98
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<pre style="margin: 0">+<span id="LC98" class="line"></span>
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99
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<pre style="margin: 0">+<span id="LC99" class="line">The PNG standard can be found at https://www.w3.org/TR/PNG/</span>
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100
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<pre style="margin: 0">+<span id="LC100" class="line"></span>
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101
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<pre style="margin: 0">+<span id="LC101" class="line">A chunk system appropriate for NTP can be summarized as follows:</span>
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102
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<pre style="margin: 0">+<span id="LC102" class="line"></span>
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103
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<pre style="margin: 0">+<span id="LC103" class="line">* Each chunk begins with a four-octet big-endian length. The length</span>
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104
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<pre style="margin: 0">+<span id="LC104" class="line"> does not count itself.</span>
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105
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<pre style="margin: 0">+<span id="LC105" class="line"></span>
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106
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<pre style="margin: 0">+<span id="LC106" class="line">* Each chunk continues with a 4-octet type identifier composed of</span>
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107
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<pre style="margin: 0">+<span id="LC107" class="line"> printable ASCII characters.</span>
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108
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<pre style="margin: 0">+<span id="LC108" class="line"></span>
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<td class="diff-line-num new new_line" data-linenumber="109" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
109
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<pre style="margin: 0">+<span id="LC109" class="line">* If the first character is uppercase, the chunk is *critical*; that</span>
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110
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<pre style="margin: 0">+<span id="LC110" class="line"> is, implementations encountering a critical chunk type they do not</span>
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111
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<pre style="margin: 0">+<span id="LC111" class="line"> recognize should treat the packet as erroneous.</span>
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112
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<pre style="margin: 0">+<span id="LC112" class="line"></span>
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113
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<pre style="margin: 0">+<span id="LC113" class="line">* If the first character is not uppercase, the chunk is non-critical</span>
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114
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<pre style="margin: 0">+<span id="LC114" class="line"> and may be skipped.</span>
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115
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<pre style="margin: 0">+<span id="LC115" class="line"></span>
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116
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<pre style="margin: 0">+<span id="LC116" class="line">* Chunk content is not constrained and is interpreted based in the</span>
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117
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<pre style="margin: 0">+<span id="LC117" class="line"> chunk type.</span>
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118
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<pre style="margin: 0">+<span id="LC118" class="line"></span>
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119
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<pre style="margin: 0">+<span id="LC119" class="line">Note that this is not identical to PNG chunk layout; one difference is</span>
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120
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<pre style="margin: 0">+<span id="LC120" class="line">that PNG chunks have only two-byte lengths and always end with a CRC.</span>
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121
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<pre style="margin: 0">+<span id="LC121" class="line">This chunk system is deliberately more similar to RFC7822 extension</span>
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122
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<pre style="margin: 0">+<span id="LC122" class="line">blocks.</span>
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123
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<pre style="margin: 0">+<span id="LC123" class="line"></span>
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124
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<pre style="margin: 0">+<span id="LC124" class="line">// end</span>
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125
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<pre style="margin: 0">+<span id="LC125" class="line"></span></pre>
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