Symmetricom SyncServer S100 User Manual page 107

Page e 94 94 .......................................................................... Pag
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messages. ages.
etricom com reco recomme mmends nds con
ore bro broad adca cast stin ing g NTP. NTP. The The us user er sh shou ould ld co conf nfig igure
the in inten tende ded d su subn bnet. et. Als
messages. ages.
To pro prote tect ct ag agai ains nst t bro broad adca cast sts s fro
authent hentic icati ation on on on the the broad broadcas
more re in infor forma mati tion on, , se see e
NTP - Config NTP - Config
ing a broadcast association a broadcast association
ure th the e Syn SyncSe cServ rver er as as a a bro
gure aut authent hentic icati ation on as as des
exam example, ple, use use
NTP - MD5 NTP - MD5
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peer ass associat ociations, ions, verify verify that
, , ob obse serve rve the the SYNC LED f
configu figuration ration
SYNC LE LED D tr tran ans s it itio ions ns fr from
one of of th three ree de defa faul ult t NTP NTP se serv rvers
green en the the Syn SyncSe cServ rver er has
ratum um 1. 1.) )
the pag page. e. Aft
NTP - Assoc NTP - Assoc
great ater er tha than n 0 0 fo for r eac each h as asso soci ciat atio ion. n. If If
eck the the fol followi lowing ng ite items
nectio tions. ns.
NTP as asso soci ciat atio ions ns. .
page: page:
main in na name me in inst stea ead d of of an an IP IP ad addr dres ess, s, th the e ma
must st hav have e a a va vali lid d DNS DNS se serve
is is co conf nfig igure ured, d, ch chec eck k th that at it it is isn't n't bl bloc ocki king ng tra
DNS serv server. er.
ociatio ations ns
when n a a ve very ry la larg rge e nu numb mber er of of NTP
Sync ncSer Serve ver r if if th the e NTP NTP LED
server ass associat ociation ion broadca broadcasts
onds. s. Afte After r exc exchang hanging ing cal calibra
routi tine ne of of li list sten enin ing g fo for, r, an and d sy sync nchro
consul sultin ting g with with you your r IT IT depa departme
ure the
Also o no note te th that at so some me net network work rou
from m an an un unaut autho horiz rized ed so sourc
cast t serv server er and and broa broadca
(o (on n pa page ge 29 29). ).
broadc adcas ast t se serv rver: er:
descri cribed bed in in Using NTP Authentication Using NTP Authentication
to to ge gener nerate ate an and d do downl wnloa oad d ke keys ys to to yo your ur work
7-0152 1520-0 0-03 3 Rev Rev. . A A
that they they are are reachabl reachable. e.
SYNC LED for or se seve veral ral mi minut
om re red d to to or oran ange ge (s (str trat atum um 2) 2), , th the e Sy
ers. . (Aft (Afterwa erward, rd, if if the
has sy sync nchro hroni nize zed d to to a a Hard Hardware
After er se seve veral ral mi minu nute tes s of of ope
eq equal uals s 0, 0, tha
Reach Reach
ms: :
rver r add addres ress. s.
traff ffic ic wit with h the
NTP cl clie ient nts s ar are e pr pres esen ent t on on a a LAN
LED is is or oran ange ge or or re red. d.
sts NTP NTP mess messages ages to to the
ibratio tion n mes messa sages ges with with the
hroni nizi zing ng wit with, h, th the e NTP
rtment nt or or netwo network rk adm admini inistra
the sc scop ope e of of th the e bro broadc adcas ast t ad addre
route ters rs are are co conf nfig igure ured d to to bl bloc ock k bro
urce, e, th the e us user er mu must st co conf nfig igure
dcast st cl clien ients. ts.
(o (on n pa page ge 99 99). ). Fo
workst stati ation. on.
Using ng NTP Usi NTP
nutes es aft after er
Sync nc- -
the SYNC SYNC
ware Clo Clock ck
operat ratio ion, n,
that t as asso so- -
man- n-
the NTP NTP
LAN. .
the subne subnet t
the se server, rver, the the
NTP
strator tor
dress ss to to
broad ad- -
ure
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