Re: Problem configuring network

On Tuesday 10 April 2007, Matthew Saltzman wrote:
On Tue, 10 Apr 2007, Anne Wilson wrote:
On Tuesday 10 April 2007 20:11, Matthew Saltzman wrote:
On Tue, 10 Apr 2007, Anne Wilson wrote:
On Tuesday 10 April 2007, Tim wrote:
On Tue, 2007-04-10 at 11:08 -0700, Knute Johnson wrote:
I've got an FC6 box that I'm having some trouble getting the network
configured correctly. I keep getting the error below when eth0 is
started. This happens on reboot or if I attempt to restart the
network.
Networking works but I keep getting the error message. Any ideas
where I've gone wrong?

[root@knute knute]# /sbin/service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
SIOCGIFFLAGS: No such device
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: sysfs class device: Permission denied
Error, some other host already uses address 192.168.3.5.
[FAILED]

Taking the error notice at face value, you've got some other device on
the same network already using that address. You can't do that, and
it checks when attempting to bring an interface on-line. Change one
of them.

Maybe something on the network grabbed the address via dhcp?

Maybe Tim should be getting *his* IP via DHCP?

Maybe, but not necessarily. It's possible to have both on one LAN. On
this LAN, for instance, we prefer to use static IP. All our boxes have
static addresses. However one work laptop needs dhcp to access a company
network. We tell the router to reserve the addresses that we use
statically, and it issues addresses outside those to a dhcp box.

Sure, that's reasonable. But a common cause of duplicate addresses is
attempting to assign onesself an address manually from a range managed by
a DHCP server. My impression is that it is becoming more common to manage
large networks with DHCP even when the machines are on the networks
permanently, just because the centralized management is simpler for the
admin.

Then again, some of the cheaper routers don't allow you to reserve addresses,
which makes it very dubious to have mixed static and dhcp on such a LAN.

Anne

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