Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: ping blocking
Special Forums IP Networking ping blocking Post 302531666 by programAngel on Friday 17th of June 2011 12:06:38 PM
Old 06-17-2011
Quote:
Originally Posted by Corona688
If you can get it, the arping utility is useful for telling between obnoxious firewalls and actual network problems. A client can't ignore ARP and still communicate over IP, afterall.

[edit] It of course only can send arp over a local subnet, though.

Some distributions of linux do block ping. Can your client ping you? If so it's not likely to be blocked since they're the same distro.

If your client is behind NAT you may not be able to directly ping it from the host.
the network setting of the VM is bridge so they are not behind NAT.

When I do ping to the VM from the command line it is working as well as from the other direction (from the VM to the host OS(of the guest VM)).

However the nmap can not find any host behind the IP.
I get the following message :
Code:
Starting Nmap 5.21 ( http://nmap.org ) at 2011-06-17 18:58 IDT
Note: Host seems down. If it is really up, but blocking our ping probes, try -PN
Nmap done: 1 IP address (0 hosts up) scanned in 0.04 seconds

---------- Post updated at 07:05 PM ---------- Previous update was at 06:59 PM ----------

---------- Post updated at 07:06 PM ---------- Previous update was at 07:05 PM ----------

Quote:
Originally Posted by Corona688
Repeating the same questions doesn't us the information we need to help you.
Thank you.


what is the information you need for helping me?

I basically run ubuntu as the OS of my computer.
I have installed virtual box and created two VM.
Both scientific linux, one was installed as a web server and the other was installed as a developing station.

In the VM network setting I give both of them bridge.

And when I do ifconfig both show legal internal IP address just link my host OS (ubuntu).
All of the the host OS and the two guest OS have the same three first octet of the IP address.

I can do ping from and to the guest OS as well as the host OS.

However nmap claim that there is no host behind the IP of the guest OS or that something blocking ping.

However this is weird because I am able to do ping to the guest OS.

due you need any more information?

What do you think can make this problem?
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

blocking domains

Dear All , Kindly note I have sun solaries 7 . I want to block a domain who keep sending emails to my domain and users . thanks (1 Reply)
Discussion started by: tamemi
1 Replies

2. Shell Programming and Scripting

blocking script help

sed -n '/robots.txt/!{s/\(\{1,\}\.*\.*\.*\).*\/\(.*\.txt\).*/\1 \2/p;}' myaapache.log Above command will search all txt except robots.txt from apache logs and show like 94.136.63.119 idsuper.txt 174.121.67.233 fx29id1.txt I want to block that ip address automatically, i need script... (1 Reply)
Discussion started by: learnbash
1 Replies

3. UNIX for Advanced & Expert Users

ps blocking

Hi Folks I have been debugging a script that is called every thirty seconds. Basically it is doing a ps, well two actually, one to file (read by the getline below) and the other into a pipe. The one into the pipe is: - V_SYSVPS=/usr/sysv/bin/ps $V_SYSVPS -p$PIDLIST -o$PSARGS... (0 Replies)
Discussion started by: steadyonabix
0 Replies

4. Programming

non blocking connect

OS : solaris 10 X86 I created stream socket, tries to connect to port 7 on the remote machine. After doing the non blocking connect call I did select with time out value is 3 secs. I am always getting timed out though I am writing prior to select. code: x=fcntl(S,F_GETFL,0);... (1 Reply)
Discussion started by: satish@123
1 Replies

5. UNIX for Dummies Questions & Answers

Blocking signals

I know how to add signal to a set. But what if I want to add 2 or 3 signals to the set. I know I can use sigaddset (&set,SIGBUS)....but what if I want to add SIGBUS and SIGALRM at once. Do i have to do it like this.. sigaddset (&set,SIGBUS); sigaddset (&set,SIGALRM); Is there another way to... (0 Replies)
Discussion started by: joker40
0 Replies

6. Red Hat

Blocking an IP address

Dear all, I am new to this forum.I need some assistant from you people. I have a server in which Linux 5 is installed and it is in the network. How i block any user to access my server.. Upto how many users i can block.. send me the procedure.... Thank you in advance...... (10 Replies)
Discussion started by: sudhansu
10 Replies

7. Shell Programming and Scripting

Animation Ping on Solaris Like Cisco Ping

Hi, I develop simple animation ping script on Solaris Platform. It is like Cisco ping. Examples and source code are below. bash-3.00$ gokcell 152.155.180.8 30 Sending 30 Ping Packets to 152.155.180.8 !!!!!!!!!!!!!.!!!!!!!!!!!!!!!. % 93.33 success... % 6.66 packet loss...... (1 Reply)
Discussion started by: gokcell
1 Replies

8. Shell Programming and Scripting

How to get reason for ping failure using perls Net::Ping->new("icmp");?

Hi I am using perl to ping a list of nodes - with script below : $p = Net::Ping->new("icmp"); if ($p->ping($host,1)){ print "$host is alive.\n"; } else { print "$host is unreacheable.\n"; } $p->close();... (4 Replies)
Discussion started by: tavanagh
4 Replies

9. Programming

Which are blocking and non-blocking api's in sockets in C ?

among the below socket programming api's, please let me know which are blocking and non-blocking. socket accept bind listen write read close (2 Replies)
Discussion started by: VSSajjan
2 Replies

10. Programming

Ping test sends mail when ping fails

help with bash script! im am working on this script to make sure my server will stay online, so i made this script.. HOSTS="192.168.138.155" COUNT=4 pingtest(){ for myhost in "$@" do ping -c "$COUNT" "$myhost" &&return 1 done return 0 } if pingtest $HOSTS #100% failed... (4 Replies)
Discussion started by: mort3924
4 Replies

LEARN ABOUT CENTOS

ocf_pacemaker_pingd

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 					    06/10/2014						    OCF_PACEMAKER_PINGD(7)
All times are GMT -4. The time now is 03:08 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy