Is there any ntpd that can be configured to listen to selected interfaces only? -


my situation is, configure many virtual network interfaces virtual machines , of networks have 2 or more addresses. don't need ntpd listen these interfaces, there seems no option restrict interfaces ntpd tries bind to. besides these "security" options in ntpd, system administrator, knows environment, best security option not listen @ interfaces. example more secure not listen external interfaces @ all, restrict access through ntp configuration.

is there ntpd software known can configured listen selected interfaces (as network daemon should)?

there 2 easy ways this, both documented in official ntp documentation:

  • use -i command line option ntpd invocation

    -i [address | interface name]        open network address given, or addresses associated       given interface name.  option may appear multiple       times.  option implies not opening other addresses,       except wildcard , local‐ host.  option deprecated.       please consider using configuration file interface command,       more versatile.

    from ntp's documentation on command line options ntpd

  • use interface directive in ntp.conf:

    interface [listen | ignore | drop] [all | ipv4 | ipv6 | wildcard | name |            address[/prefixlen]]        command controls network addresses ntpd opens, ,       whether input dropped without processing. first parameter       determines action addresses match second       parameter. parameter specifies class of addresses, or       specific interface name, or address. in address case,       prefixlen determines how many bits must match rule       apply. ignore prevents opening matching addresses, drop causes       ntpd open address , drop received packets without       examination. multiple interface commands can used. last       rule matches particular address determines action       it. interface commands disabled if -i, --interface,       -l, or --novirtualips command-line options used. if none of       options used , no interface actions specified       in configuration file, available network addresses       opened. nic command alias interface.

    from ntp's documentation on misc configuration options:


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