Cant ping Linux machine from Windows Post: 302991919

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Special Forums IP Networking Cant ping Linux machine from Windows Post 302991919 by bakunin on Saturday 18th of February 2017 10:39:12 AM

02-18-2017

Registered User

Quote:

Originally Posted by videsh77

Its not seen in

arp -a

What is its significance ?

That means that there isn't even a Layer-2 connection in place.

ARP (address resolution protocol) is working on its own address schema (the "MAC-addresses") and works below IP (=Layer 3).

When a IP-Host wants to contact another IP-Host on the same Ethernet segment this is how the communication is finally resolved: each host maintains a table (the so-called "ARP-cache", which the command arp lists) about which IP-address on the same segment relates to which MAC-address (=identifier for a certain network card) and uses this to contact the right host (more precisely: the correct IP-Interface of a certain host). For communication across segment boundaries there are bridges (or routers, switches, ...., which work the same in this regard), which are used as relays. Say, "hostA" (on segment A) wants to contact "hostB" (on segement B):

Code:

hostA@segmentA: sends packet  "dest-IP=hostB, dest-MAC=MAC of router(interfaceA), sender-IP=hostA, senderMAC=hostA"
router(interfaceA): accepts this packet as it is MAC-addressed to it
router: rewrites this packet to "dest-IP=hostB, dest-MAC=MAC of hostB, sender-IP=hostA, sender-MAC=MAC of router(interfaceB)"
router(interfaceB): sends packet to hostB

I hope this helps.

bakunin

bakunin

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LEARN ABOUT DEBIAN

tttprobe

tttprobe(1)								net							       tttprobe(1)

NAME

       tttprobe - Tele Traffic Tapper probe -  A probe to collect local traffic-data and send it to a remote instance of tttview

SYNTAX

       ttt [-interface device] [-interval ms] [-multicast] [-port dest_port] [-ttl time-to-live] [Destination]

DESCRIPTION

       tttprobe  is  the probe program in the ttt program suite. tttprobe locally collects traffic-data and sends it over a network to an instance
       of tttview.

       To run tttview, it is not necessary to be "root".

       The ttt program suite is yet another descendant of tcpdump but it is capable of real-time, graphical, local and remote  traffic-monitoring.
       It won't replace tcpdump, rather, it helps you find out what to look into with tcpdump.

OPTIONS

       ttt [-interface device] [-interval ms] [-multicast] [-port dest_port] [-ttl time-to-live] [Destination]

       -interface device
	      specifies the interface for packet capture. If not specified, the default interface is chosen.

       -interval ms
	      Sets the interval in Milliseconds. If omitted, a interval of 1000 msec. is used as default.

       -multicast
	      Shorthand for the default multicast destination "224.8.8.0".

       -port dest_port
	      Specifies the udp port number on the remote host where the traffic-data should be sent to. If omitted, port 7288 is used as default.

       -ttl time-to-live
	      Specifies the time-to-live for multicast. If omitted, 1 is used as default to restrict the multicast to the local subnet.

       Destination
	      Specifies  the  remote  host  where the traffic-data should be sent to. Destination can be omitted only, if -multicast is specified.
	      Destination can be a uni- or multicast address.

EXAMPLES

       Remark: "hostA" is allways the host where traffic-data is collected with tttprobe and "hostB" is allways the host where the traffic-data is
       displayed with tttview.

       point-to-point monitoring:

	      hostA: tttprobe hostB
	      hostB: tttview

	      or:

	      hostA: tttprobe ip_of_hostB
	      hostB: tttview

       multicast:

	      when using the default multicast address:

	      hostA: tttprobe -multicast
	      hostB: tttview -multicast

	      this is equivalent to:

	      hostA: tttprobe 224.8.8.0
	      hostB: tttview -addr 224.8.8.0

AUTHORS

       tttprobe was written by Kenjiro Cho < kjc@csl.sony.co.jp>.

       This  manual page was written by Thomas Scheffczyk <thomas.scheffczyk@verwaltung.uni-mainz.de>, for the Debian GNU/Linux system (but may be
       used by others).

SEE ALSO

       ttt(1), tttview(1)

Kenjiro Cho								1.7							       tttprobe(1)

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