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Bug 79067 - Ntpd does not work with non-fixed interfaces
Summary: Ntpd does not work with non-fixed interfaces
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: ntp
Version: 8.0
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Harald Hoyer
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2002-12-05 10:12 UTC by Jos Vos
Modified: 2007-04-18 16:48 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2002-12-05 10:12:32 UTC

Attachments (Terms of Use)

Description Jos Vos 2002-12-05 10:12:26 UTC
Description of Problem:
Ntpd seems to look only once, at startup time, to the local addresses for
binding purposes.  This means that you run into trouble with for example
ADSL/cable/dial-up PPP interfaces and with VPN tunnels, of which the interface
and address is available after ntpd startup.  NTP packets will then be generated
using a wrong source address (e.g., this might be a private address), which
might not work, either because of routing issues or by firewall blocks.

Version-Release number of selected component (if applicable):
4.1.1a-9 (applies to all versions I know).

Steps to Reproduce:
1. Set up a system with an 192.168.x.y address.
2. Do not enable masquerading.
3. Start ntpd.
4. Make a PPP connection with a default route.
5. Let ntpd talk to a public NTP server.

Actual Results:
Packets will be sent out with a 192.168.x.y address.

Expected Results:
Packats are sent out with the external PPP address.

Comment 1 Harald Hoyer 2002-12-05 10:19:31 UTC
how about /sbin/service ntp restart in /etc/ppp/ip-up.local ??
I will not fix this. Please mail this "Request for Extension" to, thx.

Comment 2 Jos Vos 2002-12-05 10:29:08 UTC
Your ip-up.local hint is what already I did (as well as in
/etc/cipe/ip-up.local), although I used "condrestart" ;-).  But a more
structural solution would be better. Anyway, I will post the bug to

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