Ntp
NTP Peer 狀態的 Select Field 中的 8 表示什麼？
我已經完成
ntpq，然後執行associations並收到以下內容：ind assid status conf reach auth condition last_event cnt =========================================================== 1 12097 c811 yes none yes reject mobilize 1從
man ntp-decode（Peer Status）的文件中，我了解到第一個數字表示Status，第二個Select，第三個Count和第四個Code。我試圖找到
Select Status本手冊的部分並找到以下內容：The Select Field displays the current selection status. (The T Field in the following table gives the corresponding tally codes used in the ntpq peers dis- play.) The values are coded as follows: +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+ | Code | Message | T | Description | +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+ | 0 | sel_reject | | discarded as not valid (TEST10-TEST13) | +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+ | 1 | sel_falsetick | x | discarded by intersection algorithm | +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+ | 2 | sel_excess | . | discarded by table overflow (not used) | +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+ | 3 | sel_outlyer | - | discarded by the cluster algorithm | +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+ | 4 | sel_candidate | + | included by the combine algorithm | +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+ | 5 | sel_backup | # | backup (more than tos maxclock sources) | +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+ | 6 | sel_sys.peer | * | system peer | +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+ | 7 | sel_pps.peer | o | PPS peer (when the prefer peer is valid) | +-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+那麼，這個
8數字Select Status是什麼意思呢？
文件中對等狀態程式碼的解釋說狀態欄位“為 5 位寬，並與 3 位寬的選擇欄位結合以創建對等狀態字的第一個完整字節。” 選擇欄位是 3 位，所以它只能有 0-7 的值。第 2 位的 8 是狀態欄位中的最低有效位，而不是選擇欄位中的最高有效位。
所以
c8表示“持久關聯”、“啟用身份驗證”和“廣播關聯”（位 0、1 和 4，計算大端序）。您可以ntpq使用readvar命令為您解釋這些欄位。這是我筆記型電腦的一個範例，它被配置為[0-3].ubuntu.pool.ntp.org在pool模式下使用：# ntpq -n ntpq> peers remote refid st t when poll reach delay offset jitter ============================================================================== 0.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000 1.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000 ... ntpq> assoc ind assid status conf reach auth condition last_event cnt =========================================================== 1 32962 8811 yes none none reject mobilize 1 2 32963 8811 yes none none reject mobilize 1 ... ntpq> readvar 32962 associd=32962 status=8811 conf, bcast, sel_reject, 1 event, mobilize, srcadr=0.0.0.0, srcport=0, srchost="0.ubuntu.pool.ntp.org", dstadr=0.0.0.0, dstport=0, leap=11, stratum=16, precision=-24, rootdelay=0.000, rootdisp=0.000, refid=POOL, reftime=00000000.00000000 Thu, Feb 7 2036 16:28:16.000, ...請注意“conf”（永久配置關聯）和“bcast”（廣播關聯），它們是狀態欄位的簡短解釋。（顯然，當它具有 POOL 的 refid 時，廣播不僅僅意味著廣播。）