Bug 83253
| Summary: | DHCP assigned NTP server is never configured properly | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Sean E. Millichamp <sean> |
| Component: | dhcp | Assignee: | Daniel Walsh <dwalsh> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 9 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2003-08-01 20:02:23 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Fixed in dhcp-3.0pl1-23 |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20021003 Description of problem: When assigning an NTP server from DHCP, the DHCP client program creates a new /etc/ntp.conf file with settings in order to use the server assigned from DHCP. The problem is that the configuration is missing a line to be functional. The /sbin/dhclient-script writes out the /etc/ntp.conf file with the server's IP address but does not write out the required "restrict" line to modify the NTP ACLs to allow communication with the server. As part of the /etc/ntp.conf file it writes out it includes a "restrict default ignore" which instructs NTP to ignore all packets from all hosts unless there is another restrict line specifically allowing it. Currently, there isn't. N.B.: The file produced by the firststart NTP configuration routine after an install DOES produce a proper (working) ntp.conf file. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Install the ntp and dhclient RPMs 2. Configure your interface for DHCP and the DHCP server to serve the "ntp-server" option. 3. Reboot/bring up the DHCP interface Actual Results: This file is generated by /sbin/dhclient-script: restrict default ignore restrict 127.0.0.1 driftfile /etc/ntp/drift broadcastdelay 0.008 authenticate yes keys /etc/ntp/keys server 192.168.1.1 Expected Results: Note that the required "restrict 192.168.1.1 nomodify notrap noquery" line is missing. Note that "ntpq -c pe" never shows a proper syncronization. The generated file should read: restrict default ignore restrict 127.0.0.1 driftfile /etc/ntp/drift broadcastdelay 0.008 authenticate yes keys /etc/ntp/keys restrict 192.168.1.1 nomodify notrap noquery server 192.168.1.1 Additional info: Here is a diff -u against /sbin/dhclient-script from phoebe2 to correct it: --- dhclient-script-orig 2003-01-31 16:37:59.000000000 -0500 +++ dhclient-script 2003-01-31 16:38:37.000000000 -0500 @@ -156,6 +156,7 @@ EOF :> /etc/ntp/step-tickers for I in $new_ntp_servers; do + echo "restrict $I nomodify notrap noquery" >> /etc/ntp.conf echo "server $I" >> /etc/ntp.conf echo "$I" >> /etc/ntp/step-tickers done