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WIERD IP PROBLEMS HELP ME!!!!please?

Posted on 1998-06-02
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Last Modified: 2013-11-13
ok we've got a bunch of macs on a novel hub.  we have it configured to ethernet and DHCP and most of the time it works ok.  BUT....Sometimes it says that the ip you want is in use.   Is there a system problem or the hub or other.  NOte, this is on everything from powermac 5200-new G3.  Please mail tandrews@mail.bemidji.k12.mn.us and also post here. THNX
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Question by:maldek
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geoffcanyon earned 200 total points
ID: 1581208
Does the fact that the IP address you want is in use prevent the Mac from using the network? or does it then work anyway? Novell isn't my area, but I'd think you could at least lessen the problem by increasing the range of IP addresses the server hands out.



Have you considered going to hard-coded addresses instead? One thing to bear in mind (if I'm understanding what you've said correctly) is that the Novell server is _not_ necessary to network the Macs. If it's acting as a file server, that's fine, and if it's acting as a gateway to the Internet or some other network, fine also. But the Macs don't need it to network. All you need are Macs, the ethernet cable (10baseT, most likely) and ethernet hubs with ports enough to support the Macs. At that point, you assign IP addresses to the Macs (If you want to use IP networking, that is--if all you want is AppleTalk you're already done) and you're ready to go.



Sorry if this is rambling--give me more information and I can be more specific to your situation.
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by:maldek
ID: 1581209
Just so u know it makes the network totally inaccessable.  I need an answer today preferably
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Author Comment

by:maldek
ID: 1581210
also no the server is the hub.(novel also isn't my speciallty I'm just a kid trying to fix my school's network, once I get a gopod answer I will tell the admin.
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Expert Comment

by:geoffcanyon
ID: 1581211
I think we're getting our terminology mixed up here. Again, I probably can't offer much on the Novell side of things. But, it's important to remember that you have options beyond the problem you describe.



In any case, if you're interested, I'll describe what I think the configuration is, then give my opinion, and you can correct my expression of the configuration.



The Physical: you have a bunch (5? 20? 100?) of Macs. Some of the Macs have a built-in 10baseT port, some have an AAUI port with a tranceiver. From that point, 10baseT cable (looks much like phone cord, only a little bit fatter and stiffer) goes either to a wall jack, or directly to a hub. (NOT the Novell server--we're not there yet) If the 10baseT goes to the wall, then somewhere the wall wiring comes out in a room. In any case, the 10baseT ends at a hub (maybe a hub-patch panel combination, but a hub nevertheless). The hub is a piece of hardware that accepts multiple 10baseT connections, and allows them to communicate. An important point to remember is: we haven't added in the Novell server yet, and what I've just described is a valid and functional network, physically. You _don't_ need a Novell server to network your Macs, and the Macs are _not_ wired directly into the Novell server--they _must_ go through a hub first. Speaking of which, also plugged in to the hub is the Novell server, connected exactly as described for the Macs. (It's possible that it is connected by a different cable type--the most likely other candidates look like the coax cable the the cable company uses to deliver TV)



Again, it is pretty near impossible that the server _is_ the hub.  Your problem is the dynamic assignment of IP addresses. Three possible reasons for dynamically assigning IP addresses are: you have more machines than valid addresses; you didn't want to worry about tracking IP addresses; you're remapping IP addresses. The problem is most likely either: you have more Macs than the range of IP addresses the Novell server is configured to hand out--this can be fixed by not running so many Macs, or reconfiguring the range on the Novell server; or the server isn't expiring the addresses properly--again, this is a server configuration issue. Still, you should be able to switch to hard coding the addresses.
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