ARP and RARP?

[isml]

These days i am reading the book <<TCP/IP Illustrated volume 1:Protocols>>,written by W.Rechard.Steven.It is really a wonderful book for me a beginner.And i have a question here:
There are two hosts on an Ethernet:A(192.168.0.1) and B(192.168.0.2).Now i am operating on the host A.Now i want to get the MAC Address of B,so i type the command:
c:\ping 192.168.0.2
then
c:\arp -a
And in the arp cache i get the MAC Address.
The question is if i have the MAC Address of B,how can i get its current IP Address?I know there is a RARP,how can i do it ?
thanx.

[Chris]

http://www.google.com/search?q=rarp

[enCode]

I would tell you but they^ would have to kill me.

[spahkle]

I would tell you but they^ would have to kill me.

IIRC, the phrase is "We could tell you, but then we'd have to kill you"

[lil_freak]

I would tell you but they^ would have to kill me.

I don't think Chris or Oversight would kill you if you told, but I do think they might do other things to you.

[junktext]

Service or command?

So is RARP an actual command, as in you can actually type it into a console... or just a type of network service that gets a client an IP based on its own MAC address (which some sites explain how to do)?

[Chris]

So is RARP an actual command, as in you can actually type it into a console... or just a type of network service that gets a client an IP based on its own MAC address (which some sites explain how to do)?

root@roamer:~$ rarp --help
Usage: rarp -a list entries in cache.
rarp -d <hostname> delete entry from cache.
rarp [<HW>] -s <hostname> <hwaddr> add entry to cache.
rarp -f add entries from /etc/ethers.
rarp -V display program version.

<HW>=Use '-H <hw>' to specify hardware address type. Default: ether
List of possible hardware types (which support ARP):
strip (Metricom Starmode IP) ether (Ethernet) tr (16/4 Mbps Token Ring)
tr (16/4 Mbps Token Ring (New)) ax25 (AMPR AX.25) netrom (AMPR NET/ROM)
arcnet (ARCnet) dlci (Frame Relay DLCI) irda (IrLAP)
x25 (generic X.25)

[enCode]

I don't think Chris or Oversight would kill you if you told, but I do think they might do other things to you.

Thats a relief

[ryanc]

root@roamer:~$ rarp --help
Usage: rarp -a list entries in cache.
rarp -d <hostname> delete entry from cache.
rarp [<HW>] -s <hostname> <hwaddr> add entry to cache.
rarp -f add entries from /etc/ethers.
rarp -V display program version.

<HW>=Use '-H <hw>' to specify hardware address type. Default: ether
List of possible hardware types (which support ARP):
strip (Metricom Starmode IP) ether (Ethernet) tr (16/4 Mbps Token Ring)
tr (16/4 Mbps Token Ring (New)) ax25 (AMPR AX.25) netrom (AMPR NET/ROM)
arcnet (ARCnet) dlci (Frame Relay DLCI) irda (IrLAP)
x25 (generic X.25)

This command can't be used to find that IP address that is being used by a given MAC address.

A utility called arping can be used to accomplish that.

hactar:~# arping 00:00:0C:92:A1:55
ARPING 00:00:0C:92:A1:55
60 bytes from 192.168.1.1 (00:00:0c:92:a1:55): icmp_seq=0 time=2.385 msec

I'm using the version available from http://www.habets.pp.se/synscan/prog...hp?prog=arping.

[Eugene Da Vinci]

umm.. I think if we view the original post, it shows in his example "C:\ping."
By just taking a wild guess I feel that were dealing w/ a windows related machine (booo!!) =(. In that case, there is no given command of "rarp."

So think he should re word his post to, "how do I use rarp in windows?"

I googled different things, and couldn’t really find it either. I checked the various ARP switches in MS-Dos, and i didn’t find anything that would translate hardware address to a Logical Address.

But the thing is i don’t see the sense dealing w/ rarp when working with workstations. (Maybe some of you can enlighten me)

Just wanted to make all aware. =)

Thank you.

-xChris