 | | | NTP problems--UPDATE 2 | NTP problems--UPDATE 2 2004-01-25 - By Shaw, Marco
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> > > > NTP: I couldn 't get it working with 7.2 with various
> > > kernels, and various NTP packages, and now still can 't get it
> > > working with 2.1AS...
> > > >
> > > > ipchains allows all eth0 traffic through (trusted
> > > interface), yet I cannot get ntp to work.
> > > >
> > > > All I get is this, but absolutely *nothing* in tcpdump:
> > > > # ntpdate -d IP_address_hidden
> > > > 15 Jan 10:05:59 ntpdate[22868]: ntpdate 4.1.2@(protected) Tue Dec
> > > 9 11:52:07 EST 2003
> > > > (1)
> > > > 15 Jan 10:06:59 ntpdate[22868]: poll(): nfound = 0,
> error: Success
> ....
>
> OK, a little bit of progress maybe. Whenver ntp fails, lsof
> prints out
> the last line below:
>
> [root@(protected) fs]# lsof|grep ntpdate
> ntpdate 461 root cwd DIR 8,7 4096
> 144002 /root
> ntpdate 461 root rtd DIR 8,7 4096 2 /
> ntpdate 461 root txt REG 8,5 40460
> 128472 /usr/sbin/ntp
> date
> ntpdate 461 root mem REG 8,7 464409
> 65742 /lib/ld-2.2.4
> .so
> ntpdate 461 root mem REG 8,5 44851
> 64355 /usr/lib/libc
> ap.so.1.10
> ntpdate 461 root mem REG 8,7 5737154
> 64013 /lib/libc-2.2
> .4.so
> ntpdate 461 root 0u CHR 136,3
> 5 /dev/pts/3
> ntpdate 461 root 1u CHR 136,3
> 5 /dev/pts/3
> ntpdate 461 root 2u CHR 136,3
> 5 /dev/pts/3
> ntpdate 461 root 3u sock 0,0
> 175748304 can 't identif
> y protocol
I played with things a bit more, and it seems that tcp_wrappers is the problem.
Unless, I add an "ALL:ALL " line in hosts.allow, I am not able to run ntpdate
As indicated above. Even adding "ALL:NTP Server IP " does not help (where "NTP
Server IP " is the host I 'm trying to run ntpdate against).
I 'm confused... Tcp_wrappers is for TCP connections, and should affect only
Incoming connections, but tcp_w is even causing problems for outgoing packets.
I don 't see any DNS traffic at the time that ntpdate is run, in case this is
a resolution problem. I 've added the host I 'm trying to run ntpdate against
in my /etc/hosts, since I 've got a multi-home hosts that uses public DNS servers
yet, my NTP source is inside a/my private network.
Any ideas what tcp_w is doing wrong here?
Marco
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