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ntp.conf の "restrict" オプションで DNS ホスト名を使用することはできますか?

Solution Verified - Updated -

Issue

"restrict" オプションの DNS ホスト名が動作しません。
このオプションで DNS ホスト名を設定すると、サーバーへの時刻同期が確立されません。

以下は、該当する ntp.conf のサンプルとなります。

restrict default ignore

# Permit all access over the loopback interface.This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1 
restrict -6 ::1
restrict 0.rhel.pool.ntp.org nomodify noquery

# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server 0.rhel.pool.ntp.org
server 1.rhel.pool.ntp.org
server 2.rhel.pool.ntp.org

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • ntp-4.2.7p23 より前の ntp

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