DHCP leases + other woes
DHCP leases + other woes
- Subject: DHCP leases + other woes
- From: Jeff Laing <email@hidden>
- Date: Mon, 25 Feb 2002 08:59:20 +1100
I've just been having a bitch of a time with my ISP, basically trying to get
multiple clients hooked up via an ethernet hub to a single cable modem.
Now, I know that I can use several distinct DHCP client ID's because I've
used them independently, and they work fine. But when I try to use them
simultaneously, the second mac to connect gets absolute garbage in its
IP/SubnetMask/DNS fields. Makes me look like a CLASS B, etc... Just
doesn't work - in fact, looks like its managed to negotiate but I can only
assume it hasn't.
When I've talked to the support guys at the ISP, they've muttered something
about "ah yes, Macs tend to lock up the DHCP Lease, turn the modem off for
30 seconds, ..." but this will still only allow *one* of the Mac's to
operate.
Why is this an MacNetworkProg posting? Two questions:
Firstly, a PC-literate/Mac friend said "boy, its a real pain that Mac's
don't have the IPCONFIG.EXE - on any Windows PC, I just go IPCONFIG/RELEASE
and I've dropped the lease".
So. Does OpenTransport provide such a tool? I haven't been able to fine
it; even making TCP/IP inactive doesn't seem to do it. However, whats a
more interesting question is "is it possible to write such a thing with the
current OT interfaces?" - the only thing to do with DHCP that I've seen is
the function that extracts connect-time info from an already established
connection. Do I have to go into the bowels of IP to be able to do this?
Secondly, is the assertion that "macs lock up the lease" true here? Or is
it more likely that there is some sort of config/magic happening between the
ISP and the Cable Modem, where the modem sees the first mac connect and from
then on refuses to talk to the second mac. Which leads to the question: is
there some way that OT can communicate with the modem itself?
(For the inquisitive: I've dropped back to using a SurfDoubler demo which
provides an NAT router capability and that seems to work - but it costs; I'd
rather someone told me about a magic IOCTL message I can send that makes the
modem just work...)
Jeff Laing <email@hidden>
------------------------------------------------------------------
I got a lot of ideas. Trouble is, most of them suck.
---George Carlin
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