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Top Forums UNIX for Beginners Questions & Answers Can ping out but cannot receive Post 303021955 by rbatte1 on Tuesday 21st of August 2018 12:28:33 PM
Old 08-21-2018
You are proving that you can lookup the DNS name to give you an IP address and indeed you may be sending packets and requests out from your server, but zero packets received means:-
  • The target IP is not active
  • There is no route to the target IP (you mention google.com but then a 172.x.x.x private address)
  • Your outbound IP tables may filter them out
  • Your network devices may filter them out
  • The target IP may ignore you
  • The target IP may try to respond but your public-facing proxy may filter them out
  • The target IP may try to respond but your internal network devices may filter them out
  • The target IP may try to respond but your inbound IP tables may filter them out

A ping is one type of packet, so it does not guarantee that you will actually be able to hold a conversation with the target address.


What is your eventual intention for which I presume that this is a step? Perhaps there is a better way to be monitoring what it is that you really need.



Kind regards,
Robin
 

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OCF_PACEMAKER_PINGD(7)					      Pacemaker Configuration					    OCF_PACEMAKER_PINGD(7)

NAME
ocf_pacemaker_pingd - pingd resource agent SYNOPSIS
[OCF_RESKEY_pidfile=string] [OCF_RESKEY_user=string] [OCF_RESKEY_dampen=integer] [OCF_RESKEY_set=string] [OCF_RESKEY_name=string] [OCF_RESKEY_section=string] [OCF_RESKEY_multiplier=integer] [OCF_RESKEY_host_list=string] [OCF_RESKEY_interval=integer] [OCF_RESKEY_attempts=integer] [OCF_RESKEY_timeout=integer] [OCF_RESKEY_options=string] pingd [start | stop | monitor | meta-data | validate-all] DESCRIPTION
This agent (ocf:pacemaker:pingd) has been replaced by the more reliable ocf:pacemaker:ping. It records (in the CIB) the current number of ping nodes (specified in the 'host_list' parameter) a cluster node can connect to. SUPPORTED PARAMETERS
OCF_RESKEY_pidfile = string [/pingd-] PID file OCF_RESKEY_user = string [root] The user we want to run pingd as The user we want to run pingd as OCF_RESKEY_dampen = integer [5s] Dampening interval The time to wait (dampening) further changes occur OCF_RESKEY_set = string [] Set name The name of the instance_attributes set to place the value in. Rarely needs to be specified. OCF_RESKEY_name = string [pingd] Attribute name The name of the attributes to set. This is the name to be used in the constraints. OCF_RESKEY_section = string [] Section name The section place the value in. Rarely needs to be specified. OCF_RESKEY_multiplier = integer [] Value multiplier The number by which to multiply the number of connected ping nodes by OCF_RESKEY_host_list = string [] Host list The list of ping nodes to count. Defaults to all configured ping nodes. Rarely needs to be specified. OCF_RESKEY_interval = integer [1] ping interval in seconds How often, in seconds, to check for node liveliness OCF_RESKEY_attempts = integer [2] no. of ping attempts Number of ping attempts, per host, before declaring it dead OCF_RESKEY_timeout = integer [2] ping timeout in seconds How long, in seconds, to wait before declaring a ping lost OCF_RESKEY_options = string [] Extra Options A catch all for any other options that need to be passed to pingd. AUTHOR
Andrew Beekhof <andrew@beekhof.net> Author. Pacemaker Configuration 04/17/2012 OCF_PACEMAKER_PINGD(7)
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