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Home > Archive > alt.certification.cisco > September 2003 > RARP
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| Hi folks,
need to get an IP address locally on a switched network, on the same vlan
and have the mac address. Want to use RARP but cannot find anything that
help.
Cheers
TJAy
| |
|
| On Thu, 31 Jul 2003 17:21:24 +0100, tjay wrote:
> Hi folks,
>
> need to get an IP address locally on a switched network, on the same vlan
> and have the mac address. Want to use RARP but cannot find anything that
> help.
>
> Cheers
>
> TJAy
What are you trying to get the address with?
A catalyst switch? IOS or CLI?
And I didn't understand. Are you trying to get the IP address, and you
HAVE the MAC?
Sorry, I just didn't quite understand the question.
| |
| email.NOSPAM@sover.net 2003-08-01, 11:25 pm |
| Correct me if I am wrong but you have the MAC address and want to see what
the current IP address. I do this two ways generally. If I happen to
have easy access to the DHCP server I can grep the logs. Otherwise I will
just ping it and use the 'arp -a' command.
______________________________
______
Talk is cheap. Supply exceeds Demand.
On Thu, 31 Jul 2003, tjay wrote:
>
>
> Hi folks,
>
> need to get an IP address locally on a switched network, on the same vlan
> and have the mac address. Want to use RARP but cannot find anything that
> help.
>
> Cheers
>
> TJAy
>
>
>
| |
| M Riding 2003-08-02, 5:24 pm |
| I don't think that is what is being asked.... I wondered about the
same question recently - exams and books always talk about ARP and
Reverse ARP, and arp is seen and used commonly. Is there an
application that, given a MAC address, will determine an IP address
using reverse ARP (not by looking at a DHCP server [which is using
ARP, not RARP])? I've been unable to find an application (or a switch
for arp)- reverse ARP is referenced all the time in study guides,
TCP/IP books & such, but I have yet to see a real world application
that actually does RARP.
| |
| John Agosta 2003-08-02, 6:24 pm |
|
"M Riding" <monte237@comcast.net> wrote in message
news:290a63a8.0308021254.44ed784e@posting.google.com...
> I don't think that is what is being asked.... I wondered about the
> same question recently - exams and books always talk about ARP and
> Reverse ARP, and arp is seen and used commonly. Is there an
> application that, given a MAC address, will determine an IP address
> using reverse ARP (not by looking at a DHCP server [which is using
> ARP, not RARP])? I've been unable to find an application (or a switch
> for arp)- reverse ARP is referenced all the time in study guides,
> TCP/IP books & such, but I have yet to see a real world application
> that actually does RARP.
I think the use of RARP has faded away with the introduction of BOOTP and
then DHCP.
Back in the early 90's I had something called a RARP
server which was used to assign IP's to some of
my network gear. It was a DEC implementation.
Haven't seen it used in many moons since....
| |
|
| On 2 Aug 2003, M Riding wrote:
> I don't think that is what is being asked.... I wondered about the
> same question recently - exams and books always talk about ARP and
> Reverse ARP, and arp is seen and used commonly. Is there an
> application that, given a MAC address, will determine an IP address
> using reverse ARP (not by looking at a DHCP server [which is using
> ARP, not RARP])? I've been unable to find an application (or a switch
> for arp)- reverse ARP is referenced all the time in study guides,
> TCP/IP books & such, but I have yet to see a real world application
> that actually does RARP.
>
You might want to look into "thin-client". It never caught on but SUN
and IBM were pushing it in the 90's. The idea was having a big and
powerful application server running everything and your "thin client"
just connecting to it; no need for hard-drive on the local machine!
The thih-client would send an RARP request upon bootup and the
server would reply with an ip address.
Doan
| |
| Bernie 2003-08-02, 9:24 pm |
| On Sat, 2 Aug 2003 15:59:29 -0700, Doan <doan@usc.edu> wrote:
>On 2 Aug 2003, M Riding wrote:
>
>> I don't think that is what is being asked.... I wondered about the
>> same question recently - exams and books always talk about ARP and
>> Reverse ARP, and arp is seen and used commonly. Is there an
>> application that, given a MAC address, will determine an IP address
>> using reverse ARP (not by looking at a DHCP server [which is using
>> ARP, not RARP])? I've been unable to find an application (or a switch
>> for arp)- reverse ARP is referenced all the time in study guides,
>> TCP/IP books & such, but I have yet to see a real world application
>> that actually does RARP.
>>
>You might want to look into "thin-client". It never caught on but SUN
>and IBM were pushing it in the 90's. The idea was having a big and
>powerful application server running everything and your "thin client"
>just connecting to it; no need for hard-drive on the local machine!
>The thih-client would send an RARP request upon bootup and the
>server would reply with an ip address.
>
>Doan
What is interesting is that most of today's "thin clients" are really
fat by comparisons! They have to have enough hardware and software to
run a MS or Citrix terminal server application, which makes for a much
longer list of hardware for that client. Obviously, I am referring to
the MS-environment "thin clients" not the (still existing) legacy
thin-client environments.
--Bernie
| |
| David Brownridge 2003-08-02, 9:24 pm |
| <email.NOSPAM@sover.net> wrote in message
news:Pine.BSI.4.21.0308012239360.26994-100000@granite.sover.net...
> Correct me if I am wrong but you have the MAC address and
> want to see what the current IP address....
> Otherwise I will just ping it and use the 'arp -a' command.
Perhaps I'm missing something here. If you don't know the IP address (and
presumably not the host name), how do you ping it?
--
rgds
David Brownridge
| |
| Bernie 2003-08-02, 10:24 pm |
| On Sun, 3 Aug 2003 10:29:55 +1000, "David Brownridge"
<DVD@melbpc.org.au> wrote:
><email.NOSPAM@sover.net> wrote in message
>news:Pine.BSI.4.21.0308012239360.26994-100000@granite.sover.net...
>
>> Correct me if I am wrong but you have the MAC address and
>> want to see what the current IP address....
>> Otherwise I will just ping it and use the 'arp -a' command.
>
>
>Perhaps I'm missing something here. If you don't know the IP address (and
>presumably not the host name), how do you ping it?
I think he was saying that if you already knew the IP address you
would just do a ping and let ARP find the MAC for you, as opposed to
the reverse. I think what he was missing was that RARP allows you to
"discover" your *own* IP address, sort of like BOOTP or DHCP. He was
assuming that RARP was a form of remote host lookup where you knew the
MAC of the remote, but not the IP. I don't know of any situation
where this would be the case though, not in the IP world anyway.
--Bernie
| |
| Micah Jordan Compton 2003-08-03, 2:25 pm |
| On Thu, 31 Jul 2003 17:21:24 +0100, tjay wrote:
> Hi folks,
>
> need to get an IP address locally on a switched network, on the same vlan
> and have the mac address. Want to use RARP but cannot find anything that
> help.
>
> Cheers
>
> TJAy
You switched network currently operates at layer2 unless you have some
layer3 switches stuffed into the mix. In a typical switched environment
you will only be able to see MAC layer addresses that get learned quite
quickly by the switch.
<catOS command> show cam dynamic
To turn these MAC addresses into something usable eg. IP addresses. Goto
the nearest router that is currently routing that subnet and compare your
known MAC to the arp table in the router.
<IOS command> show ip arp
-micah
| |
| Hansang Bae 2003-08-06, 1:24 am |
| In article <290a63a8.0308021254.44ed784e@posting.google.com>, monte237
@comcast.net says...
> I don't think that is what is being asked.... I wondered about the
> same question recently - exams and books always talk about ARP and
> Reverse ARP, and arp is seen and used commonly. Is there an
> application that, given a MAC address, will determine an IP address
> using reverse ARP (not by looking at a DHCP server [which is using
> ARP, not RARP])? I've been unable to find an application (or a switch
> for arp)- reverse ARP is referenced all the time in study guides,
> TCP/IP books & such, but I have yet to see a real world application
> that actually does RARP.
The problem is that RARP has gone the way of archie, veronica, gopher,
mop, etc. Its of historical importance only. You might find a Linux
port somewhere but it never really caught on once people started routing
- for obvious reasons.
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
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| |
|
| Posted a question exactly like this an got the same responses.
When even asking Cisco TAC if you can issue a RARP resolve to an IP address
and said NO!
So looks like we are stuck with looking at arp tables and hope its in there.
"M Riding" <monte237@comcast.net> wrote in message
news:290a63a8.0308021254.44ed784e@posting.google.com...
> I don't think that is what is being asked.... I wondered about the
> same question recently - exams and books always talk about ARP and
> Reverse ARP, and arp is seen and used commonly. Is there an
> application that, given a MAC address, will determine an IP address
> using reverse ARP (not by looking at a DHCP server [which is using
> ARP, not RARP])? I've been unable to find an application (or a switch
> for arp)- reverse ARP is referenced all the time in study guides,
> TCP/IP books & such, but I have yet to see a real world application
> that actually does RARP.
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