Re: DHCP woes

On Monday 19 Jun 2017 09:12:45 Joe Acquisto-j4 wrote:
> IPCop v2.1.9
> 
> I continue to have DHCP oddities.   For instance one device, on GREEN
> segment, was handed out a dynamic address for BLUE.  That has happened to
> several devices.
> 
> GREEN and BLUE are on different NIC.   However, after several power cycles
> on the device, now it is being handed out a GREEN address.  One oddness is
> that the "edit" icon is greyed out for that address.
> 
> I added that device to the "fixed lease" list yet it continues to hand it
> GREEN address.

The BIOS in some boxes finds devices in random order, first to reply, and passes 
the list to Linux. I had to sort this while testing a shorewall setup by using 
a file in /etc/network/if-pre-up.d called get-mac-address.sh (remove "##### " 
from each line and re-join the line beginning mac=)


##### #!/bin/sh
##### 
##### set -e
##### 
##### export LANG=C
##### 
##### iface="$1"
##### mac=$(/sbin/ifconfig "$iface" | sed -n -e '/^.*HWaddr \([:
[:xdigit:]\-]*\).*/{s//\1/;y/ABCDEF/abcdef/;p;q;}')
##### which=""
##### 
##### while read testmac scheme; do
##### 	if [ "$which" ]; then continue; fi
##### 	if [ "$mac" = "$(echo "$testmac" | sed -e 'y/ABCDEF/abcdef/')" ]; then 
##### which="$scheme"; fi
##### done
##### 
##### if [ "$which" ]; then echo $which; exit 0; fi
##### exit 1

Then near the beginning of the file /etc/network/interfaces, insert

auto eth0 eth1 eth2 eth3
mapping eth0 eth1 eth2 eth3
    script /etc/network/if-pre-up.d/get-mac-address.sh
    map xx:00:00:00:00:9e eth0
    map xx:00:00:00:00:00 eth1
    map xx:00:00:00:86:b3 eth2
    map xx:00:00:00:00:0e eth3

Hope that helps.

-- 
Chris Bell
website chrisbell.org.uk

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