[Patch] Lease IP address from some specific DHCP server
When a Debian live system leasing an IP address from DHCP server, if
there are 2 or more (seldom, but it might happen) DHCP servers in the
LAN, it would be better there is an option so that the client machine
can pick up the specific one via DHCP vendor class identifier.
Attached please find the patch to support this. For example, if the boot
parameter
dhcp-vendor-id=DebianLiveClient
is used, then the ipconfig in the initrd will try to lease the IP
address from the DHCP server which has the config in the dhcpd.conf:
class "My-Live-Client" {
match if
(substring(option vendor-class-identifier, 0, 9) = "PXEClient") or
(substring(option vendor-class-identifier, 0, 10) = "DebianLiveClient") ;
}
Hope this helps.
My 2 cents.
Steven
--
Steven Shiau <steven _at_ stevenshiau org>
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diff -uNr orig/9990-cmdline-old new/9990-cmdline-old
--- orig/9990-cmdline-old 2016-05-11 21:44:15.000000000 +0800
+++ new/9990-cmdline-old 2016-06-17 11:48:59.537265469 +0800
@@ -135,6 +135,11 @@
export NETBOOT
;;
+ dhcp-vendor-id=*)
+ DHCP_VENDOR_ID="${_PARAMETER#dhcp-vendor-id=}"
+ export DHCP_VENDOR_ID
+ ;;
+
nfsopts=*)
NFSOPTS="${_PARAMETER#nfsopts=}"
export NFSOPTS
diff -uNr orig/9990-networking.sh new/9990-networking.sh
--- orig/9990-networking.sh 2016-05-11 21:44:15.000000000 +0800
+++ new/9990-networking.sh 2016-06-17 11:54:13.846824046 +0800
@@ -61,6 +61,11 @@
[ -n "$ETHDEV_TIMEOUT" ] || ETHDEV_TIMEOUT=15
echo "Using timeout of $ETHDEV_TIMEOUT seconds for network configuration."
+ if [ -n "$DHCP_VENDOR_ID" ]
+ then
+ echo "Using DHCP vendor class ID: $DHCP_VENDOR_ID"
+ DHCP_VENDOR_ID_OPT="-i $DHCP_VENDOR_ID"
+ fi
if [ -z "${NETBOOT}" ] && [ -z "${FETCH}" ] && [ -z "${HTTPFS}" ] && [ -z "${FTPFS}" ]
then
@@ -94,8 +99,8 @@
# why we use '$devlist $devlist $devlist' for the other for loop
for dev in $devlist $devlist $devlist
do
- echo "Executing ipconfig -t $ETHDEV_TIMEOUT $dev"
- ipconfig -t "$ETHDEV_TIMEOUT" $dev | tee -a /netboot.config &
+ echo "Executing ipconfig -t $ETHDEV_TIMEOUT $DHCP_VENDOR_ID_OPT $dev"
+ ipconfig -t "$ETHDEV_TIMEOUT" $DHCP_VENDOR_ID_OPT $dev | tee -a /netboot.config &
jobid=$!
sleep "$ETHDEV_TIMEOUT" ; sleep 1
if [ -r /proc/"$jobid"/status ]
@@ -115,7 +120,7 @@
done
else
for interface in ${DEVICE}; do
- ipconfig -t "$ETHDEV_TIMEOUT" ${interface} | tee /netboot-${interface}.config
+ ipconfig -t "$ETHDEV_TIMEOUT" $DHCP_VENDOR_ID_OPT ${interface} | tee /netboot-${interface}.config
[ -e /run/net-${interface}.conf ] && . /run/net-${interface}.conf
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