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Posted by Usual Suspect on July 22, 2007, 3:27 am
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JetDirect card J3111A/600N (10baseT, RJ-45).
Logging into the card using a web browser, under Configurations tab, the TCP
options can be found. One of the choices is to choose whether the IP address
is assigned via DHCP, BOOTP, or Manually.
From the drop-down menu I choose Manually and then click the Apply button at
the bottom of the window. (I left the IP address alone as it was fine; I just
want it to remain that address and not get reassigned by DHCP.)
When the window refreshed, the drop-down menu said "DHCP". I repeated the
selection of Manual from the menu and again clicked the Apply button, but
again, when the window refreshed the menu showed DHCP.
I shut off the printer and restarted it; it showed the same IP address, but
I'm not sure if it is showing me its fixed address, or it's just that the
DHCP router had assigned the same dynamic address to the printer.
Has anyone come across this problem with JetDirect cards? Did I set a fixed
address? Will it remain the same? If not, how does one get around the problem
of the menu reverting to DHCP?
Thanks,
--
Al, the usual
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Posted by glen herrmannsfeldt on July 22, 2007, 4:02 am
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Usual Suspect wrote:
> JetDirect card J3111A/600N (10baseT, RJ-45).
(snip)
> I shut off the printer and restarted it; it showed the same IP address, but
> I'm not sure if it is showing me its fixed address, or it's just that the
> DHCP router had assigned the same dynamic address to the printer.
You should not configure a static address within the range supplied
by DHCP. It should, then, not configure using DHCP the same address
set as a static address.
-- glen
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Posted by Usual Suspect on July 22, 2007, 4:13 am
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> You should not configure a static address within the range supplied
> by DHCP. It should, then, not configure using DHCP the same address
> set as a static address.
Ah, I think I see your point. DHCP router will assign addresses within a
range defined by (me?). I can assign static addresses outside this range.
But the JD card won't "know" what those dynamic addresses are. And the router
will poll and see that that address is already taken, so it will not dole it
out. Isn't this correct?
Thanks,
--
Al, the usual
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Posted by glen herrmannsfeldt on July 22, 2007, 1:17 pm
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Usual Suspect wrote:
>>You should not configure a static address within the range supplied
>>by DHCP. It should, then, not configure using DHCP the same address
>>set as a static address.
(snip)
> But the JD card won't "know" what those dynamic addresses are. And the router
> will poll and see that that address is already taken, so it will not dole it
> out. Isn't this correct?
DHCP won't poll and will likely give that address to the next host
that makes a request.
Some hosts, when starting up, ARP for their address and complain
if a reply comes back (from someone else using that address).
I don't know that any do that for DHCP assigned addresses.
There is no poll method, and I don't know any DHCP servers
that use ARP to test addresses.
-- glen
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Posted by Warren Block on July 22, 2007, 2:11 pm
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>> You should not configure a static address within the range supplied
>> by DHCP. It should, then, not configure using DHCP the same address
>> set as a static address.
>
> Ah, I think I see your point. DHCP router will assign addresses within a
> range defined by (me?). I can assign static addresses outside this range.
This is a nice way to do things.
> But the JD card won't "know" what those dynamic addresses are.
But you do, and you're the one who assigns the JetDirect a static
address.
> And the router will poll and see that that address is already taken,
> so it will not dole it out. Isn't this correct?
DHCP is supposed to ping an address before reusing it. However, that
only works if you leave the JetDirect powered on all the time. Or,
technically, at least powered on when a new DHCP lease is needed.
The DHCP ping check might not be implemented by cheap routers, or might
have been disabled by someone who thought that was a good idea--great
fun on a big network.
--
Warren Block * Rapid City, South Dakota * USA
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