Re: DHCP giving out wrong subnet IP

On Wednesday 29 Mar 2017 11:16:45 you wrote:
> . . .
> 
> >> > On 29/03/2017 13:43, Joe Acquisto-j4 wrote:
> >> >> IPCop v2.1.9.    Seems to be working fine otherwise.
> >> >> 
> >> >> Occasionally a device on my GREEN will get handed an address from my
> >> >> BLUE
> >> > 
> >> > network.   This is disconcerting.
> >> > 
> >> >> In fact, one of the devices was supposed to have a fixed lease.    In
> >> >> this
> >> > 
> >> > case it happened right after a reboot after applying latest patch
> >> > Tuesday
> >> > stuff for Windows 7.   (Yes, it's true I must win from time to time. .
> >> > .
> >> > ).
> >> > A reboot provided the correct IP.   This is a Dell of recent Vintage.
> >> > 
> >> >> Prior to this it happened to a different box an older Toshiba
> >> >> L505-ES5010,
> >> > 
> >> > rescued from a scarp pile, mended and now condemned to life as a
> >> > "beater",
> >> > (poor thing) while tinkering with different OS installs.   This one was
> >> > free to accept any address.
> >> > 
> >> >> joe a.
> > 
> > Some boxes have a BIOS which finds network interfaces in random order, and
> > eth0, eth1, eth2, eth3 could then refer to any of the physical interfaces.
> > This can be fixed by doing an if-pre-up check to ensure that each in turn
> > has the correct MAC address. See man interfaces.
> 
> You are referring to the "client" side box, correct?  If so, the boxes in
> question have only one physically connected NIC.
> 
> The IPCop box was not rebooted during that time.   Although I did reboot it
> after the client regained a proper GREEN address.  Just because.
> 
> joe a.

I had the problem while configuring an IPv6 capable Debian + shorewall box to 
replace the IPv4-only IPCop. I wanted a similar configuration, and am now 
testing it piggy-back on the IPCop green interface at the moment, ready for a 
sudden switch to IPv6 at any time my ISP gets around to it. The shorewall box 
"red" interface is just another box connected to the IPCop "green" interface.

-- 
Chris Bell
website chrisbell.org.uk

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