D'oh!

[Chris Aitken]

James Knott wrote:

> chris-n/jUll39koHNgV/OU4+dkA at public.gmane.org wrote:
>
>> James Knott writes:
>> <snip>
>>
>>> I assume you're using DHCP.  Is there any reason you can't assign a 
>>> dedicated IP address to that computer's MAC address?
>>
>>
>> Wouldn't that mean I can't have a LAN address as well? We have on 
>> eprinter attached to one computer and the other three computers need 
>> to print to it.
>
>
> Judging from the other messages, it's hard to see what it is you want. 
> I assume you want both a local lan address as well as one assigned by 
> an ISP.  Is that correct? 

Exactly.

If so, you need 2 addresses, the 2nd being an "alias". 

Okay.

IIRC, if you want both a static and DHCP address on a NIC, only the 
alias can have a DHCP address. 

Okay.

As someone else mentioned, you cannot have two addresses on the same 
subnet assigned to the NIC.  A little more detail about what precisely 
you're trying to do would help, instead of trying to guess what you're 
doing.

Okay. I gave a verbal diagram in another email. Here it is so you have 
it handy:

I have four computers:
cpc (connected by usb to a printer which is shared) runs ubuntu 7.10,
ppc (fedora core 4),
dpc (ubuntu 7.10), and
bpc (fedora  7)

All four computers are attached to a router. The router is attached to 
the cable modem. The cable modem is attached to, well, the Internet. 
That's it. ppc, ppc, and bpc all print (vian cups) to cpc's printer.

Just so we're clear, I'm okay now - I mean I am printing to the remote 
printer and all computers are on the Internet. Lennart is still 
concerned as my /etc/network/interfaces is "working" it is a bit funky. 
Maybe, the next cable modem reboot, or computer reboot I'll have trouble 
because of this crazy /etc/network/interfaces file (on cpc by the way). 
dpc is the next computer I want to configure with a local address so it 
can print to cpc's printer. Interestingly, it has no entry whatsoever in 
/etc/network/interfaces for dhcp-assigned connection though it is 
happily on the Internet as we write. It seems to truly be getting it's 
address from the cable modem (and through the router) with no help from 
any configuration file.

Thanks,

Chris
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