How can you identify the intermediate nodes along the path using ping ONLY

Hi,

Is this possible to identify intermediate nodes by using pin command
olnly? Somebody told me that it is. Can anyone please elaborate how?

Thanks,
Aamir

On Wed, 02 Aug 2006 08:44:03 -0700, aamircheem wrote:

> Is this possible to identify intermediate nodes by using pin command
> olnly? Somebody told me that it is. Can anyone please elaborate how?

traceroute, or tracert on that Windose POS you are using.

(E-Mail Removed) wrote:
> Hi,
>
> Is this possible to identify intermediate nodes by using pin command
> olnly? Somebody told me that it is. Can anyone please elaborate how?

You can set the "record route" option. Cooperating routers will add
their info to the packet and eventually all the info gets back to you.

There's no requirement for any router to cooperate, though.

(E-Mail Removed) wrote:
> Hi,
>
> Is this possible to identify intermediate nodes by using pin command
> olnly? Somebody told me that it is. Can anyone please elaborate how?
>
> Thanks,
> Aamir

Usually this is done with tracert (windows) or traceroute (*nix), but
what tracert actually does is pinging the host with TTL increasing from
1 with a step of one. When the TTL of the ping packet expires, the
router at which this happens reports to you "TTL expired in transit".
Since this reporting is done with an IP packet you know the address of
the router from the source IP field of the report packet. Then tracert
increases the TTL with 1 and repeats the procedure - thus the next
router will report that the TTL expired, and so on until the actual
host is reached. In this way you get the IP-s of routers on the way.
You can try this yourself with the ping command (and this directly
answers your question) - do a ping with setting the TTL of the packet
first to 1, and look who responds to it, then set TTL to 2 and so on.

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(E-Mail Removed) wrote:
> Hi,
>
> Is this possible to identify intermediate nodes by using pin command
> olnly? Somebody told me that it is. Can anyone please elaborate how?

Yes, sort of.

You can ask for "route record" to be returned on the ping response
packet. Up to 9 nodes can be recorded, so if your target is more than 9
hops away, then you lose the record of some of the nodes.

See the ping(8) manpage for details...
-R Record route. Includes the RECORD_ROUTE option in
the ECHO_REQUEST packet and displays the route
buffer on returned packets. Note that the IP
header is only large enough for nine such routes.
Many hosts ignore or discard this option.


HTH
- --
Lew Pitcher

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