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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?
 

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LEARN ABOUT REDHAT

xsetpointermapping

XSetPointerMapping(3X11)					  XLIB FUNCTIONS					  XSetPointerMapping(3X11)

NAME

       XSetPointerMapping, XGetPointerMapping - manipulate pointer settings

SYNTAX

       int XSetPointerMapping(display, map, nmap)
	     Display *display;
	     unsigned char map[];
	     int nmap;

       int XGetPointerMapping(display, map_return, nmap)
	     Display *display;
	     unsigned char map_return[];
	     int nmap;

ARGUMENTS

       display	 Specifies the connection to the X server.

       map	 Specifies the mapping list.

       map_return
		 Returns the mapping list.

       nmap	 Specifies the number of items in the mapping list.

DESCRIPTION

       The XSetPointerMapping function sets the mapping of the pointer.  If it succeeds, the X server generates a MappingNotify event, and XSet-
       PointerMapping returns MappingSuccess.  Element map[i] defines the logical button number for the physical button i+1.  The length of the
       list must be the same as XGetPointerMapping would return, or a BadValue error results.  A zero element disables a button, and elements are
       not restricted in value by the number of physical buttons.  However, no two elements can have the same nonzero value, or a BadValue error
       results.  If any of the buttons to be altered are logically in the down state, XSetPointerMapping returns MappingBusy, and the mapping is
       not changed.

       XSetPointerMapping can generate a BadValue error.

       The XGetPointerMapping function returns the current mapping of the pointer.  Pointer buttons are numbered starting from one.  XGetPoint-
       erMapping returns the number of physical buttons actually on the pointer.  The nominal mapping for a pointer is map[i]=i+1.  The nmap argu-
       ment specifies the length of the array where the pointer mapping is returned, and only the first nmap elements are returned in map_return.

DIAGNOSTICS

       BadValue  Some numeric value falls outside the range of values accepted by the request.	Unless a specific range is specified for an argu-
		 ment, the full range defined by the argument's type is accepted.  Any argument defined as a set of alternatives can generate this
		 error.

SEE ALSO

       XChangeKeyboardControl(3X11), XChangeKeyboardMapping(3X11)
       Xlib - C Language X Interface

X Version 11							    Release 6.6 					  XSetPointerMapping(3X11)
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