220.127.116.11 is a multicast NTP server.
1. /usr/sbin/ntpdate -v -s -b -p 8 18.104.22.168
2. in /var/log/messages you get:
Dec 12 15:46:30 termite ntpdate: ntpdate email@example.com Mon Oct 11
09:15:59 EDT 2004 (1)
Dec 12 15:46:30 termite ntpdate: too many recvbufs allocated (43)
Dec 12 15:46:36 termite ntpdate: too many recvbufs allocated (43)
Dec 12 15:46:38 termite ntpdate: no server suitable for synchronization found
This used to work correctly with RHEL3.
Created attachment 131363 [details]
Fix manycast support in ntpdate
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.