This is to protect against mis-alligned clocks as that would break Kerberos authentication on the network. My implmentation also provides a field to allow the user to type in the ip or netbios name of a local network NTP server (on a windoz network its usually the primary domain controller) as it is not uncommon for network admins to block access to outside time servers. In terms of the servers used.in my app there is a web ajax interface (on a stand alone server that comms with the pic via a TCP socket and a RPC type mechanism) that allows settings changes, with this i provided a "region" option and given the region i use that region NTP pool servers (for info) this gets you arround relying on one server since when you use DNS to resolve on the pool server urls it will pick among all active NTP pool servers in that region. That means that this server/client is recorded as a NTP member, but there is no further information about it, because it never sent a NTP packet.I did end up writting one of my own anyway about a week ago.i looked through the RFC for NTP a bit, got frustrated by the poor organization and ascii art and ended up building a request packet, sending it and looking at the response packet using Ethereal :P.its actually a very simple protcol to use as a pure client. This indicates that this server/client has received a NTP packet but didn’t send a response to the client/server. It can happen that rows have no values respectively show only ‘-‘ for most values. The number of NTP users that use this clock as a reference.Ĭhrony sets the reference timestamp to zero and the received/transmit timestamp to a random value. Time at the server when the resonse was sent to the client.
Time at the server when the client request arrived. Time at the client when the request was sent to the server. This is the maximum error relative to the primary reference source at the root of this subnet. This number indicates the total roundtrip delay to the primary reference source at the root of this subnet. The precision of the reference time clock, more precise: A precision value 25ms indicates that the reference clock is able to maintain this precision.
#PACKET SENDER NTP PLUS#
One plus the stratum of the reference clock The stratum is the hierarchy level of the NTP server and represents the distance from the reference clock. The minimum intervall in seconds between transmitted messages. The clock is unsynchronized if the leap indicator is set to 3 (warning).Ĭlock is in an unsynchronized state (warning) If the leap indicator is set to 1 respectively 2 a leap second will be inserted respectively removed this day.Ī leap indicator of 0 means that everything is okay and no insertion or removing of leap seconds is necessary. This column shows all known name information about the server IP. Therefore every clock that is configured as a reference clock will be stored as a server. This status is assigned when this IP has sent a NTP with flag 4. The following documentation is based on the RFCs. It stores the NTP servers, including their clients, and further NTP related information.
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