[TriLUG] newbie needs help with IP setup, part 1: DHCP

[Tim Jowers]

Did you take a look at TinaPOS? It looks very nice and works with wands and
receipt printers.

Best,
Tim


On Dec 4, 2007 5:04 PM, Brian Henning <Brian.Henning at datadirect.com> wrote:

> TWC is probably not allowing you more than one public IP at a time, and
> probably once your laptop grabbed it the first time, your laptop's MAC
> was stored in the cable modem, preventing any other MAC from obtaining a
> lease.  Power-cycling the modem should clear its MAC cache and allow a
> different device to request an IP (but still only one device at a time).
>
> So, one thing you didn't specify is whether the modem is configured as a
> bridge (handing out public IPs to connected devices) or a router
> (handing out private [probably 192.168.x.x] addresses to devices).  My
> argument is null for the latter, but worth examining for the former.
>
> My Motorola Surfboard TWC modem is only a bridge, to my knowledge.
>
> HTH,
> ~B
>
> -----Original Message-----
> From: trilug-bounces at trilug.org [mailto:trilug-bounces at trilug.org] On
> Behalf Of Tom Roche
> Sent: Tuesday, December 04, 2007 4:55 PM
> To: trilug at trilug.org
> Subject: [TriLUG] newbie needs help with IP setup, part 1: DHCP
>
>
> I'm trying to setup a POS for my food co-op. That will ultimately
> require static IP (more later), but for current testing DHCP should
> work. Unfortunately I'm not getting even that, and I'd appreciate your
> help. Note that the following is all barebones because we're poor and
> we're trying to do this cheap (and we're all volunteers).
>
> I've got a box setup with latest Ubuntu Server Edition, commandline
> only. The install looks good: I can `lynx http://localhost`<http://localhost%60>and see
> the POS interface. Both the box and my laptop are connected (via cat5)
> to an old-school 10/100 hub, which is itself connected (via cat5) to a
> TWC cablemodem. The laptop DHCPs and IPs just fine. So I su'd into the
> box and
>
> 0 cp /etc/network/interfaces /etc/network/interfaces.orig
>
> 1 edited /etc/network/interfaces from
>
> - auto eth0
> - iface eth0 inet static
> - blah
> - blah
> - blah
>
> to
>
> + auto eth0
> + iface eth0 inet dhcp
> + # blah
> + # blah
> + # blah
>
> 2 /etc/init.d/networking restart
>
> but that doesn't work: scroll includes
>
>  > DHCPRELEASE on eth0 to 192.168.1.1 port 67
>  > send_packet: Network is unreachable
>
> and finishes with
>
>  > No DHCPOFFERS received.
>  > No working leases in persistent database - sleeping.
>
> Just to rule out a connection problem, I disconnected the cables at my
> laptop and back o' the box and swapped them: laptop was fine with
> that.
>
> What am I doing wrong? Your assistance is appreciated, esp commandline
> help. (For the application I'd prefer not to put X on the box.)
>
> TIA, Tom Roche <Tom_Roche at pobox.com>
>
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