[CentOS] NTP server problem behind firewall
Giles Coochey
giles at coochey.netTue Sep 4 08:36:27 UTC 2012
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On 04/09/2012 07:31, Artifex Maximus wrote: > > The first time (16:39:13.653674) client cannot sync to the server but > second time (16:39:43.145984) that was successful even if there is a > 'bad udp cksum'. BTW, is it normal? Tcpdump says there was traffic and > sync happened later so rule is OK I think. > > When tried later sync needs three tries for success. Other time needs > only one. Might depend on Moon phase. It looks like I have some > network equipment related problem as well. Therefore I have to talk > with some Cisco expert. > > At the moment I have problem with rsyslogd because there is no log of > denied packets but that is another story. :-) > > Thanks for all of your help! > > Without seeing the full timeline of events, you should bear in mind that there will be a gap between the time that an NTP server is started before other clocks are allowed to sync to it. This makes sense as you wouldn't want to sync time to a source that itself isn't reliable. Once the NTP server fulfils some criteria and believes it's clock to be reliable, it will allow other systems to sync to it. -- Regards, Giles Coochey, CCNA, CCNAS NetSecSpec Ltd +44 (0) 7983 877438 http://www.coochey.net http://www.netsecspec.co.uk giles at coochey.net
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