[Ltib] udhcpc gets different addr

[Michael Jones]

Hi LTIBbers,

I have had the problem that I can't boot into the rootfs/ directory 
using NFS if LTIB built "rootfs/" destined for a jffs2 image, because of 
a problem with DHCP.  I can only use NFS if I tell LTIB that I want 
Target image: "NFS only".  But I would like to be able to always build 
the jffs2 image and still have the option of mounting via NFS.

Here's the problem:  in my kernel config, I have CONFIG_IP_PNP_BOOTP=y. 
This is necessary for NFS to work, to get an IP address before trying to 
mount the root FS.  After mounting rootfs/, if DEPLOYMENT_STYLE is 
anything but "NFS", udhcp is called to get an IP.  Because my kernel 
config already got me an IP, this should just be a (safe) redundant 
step, but for some reason, my DHCP server gives me a _different_ IP 
address than I was given during kernel boot.  As soon as my IP changes, 
my NFS is of course hosed.

With the assurance that my kernel will take care of configuring the IP 
address before mounting the RFS,  I'm unchecking "Enable interface 0" in 
LTIB (SYSCFG_IFACE0=n), but then I get the misleading warning from 
"/etc/rc.d/init.d/network" that "Warning: no IPADDR is set, ...".  I've 
added the following patch below to my skell package so I don't get this 
message unless "ifconfig" doesn't have an address for eth0.

I don't mean to complain of a problem with LTIB here, because it seems 
my DHCP server is misbehaving.  Does anybody have a suggestion why the 
kernel DHCP and the udhcpc requests yield different addresses?  Do you 
think my skell fix is hideous or problematic?

thanks,
Michael


$ diff -u rpm/BUILD/skell-1.16/etc/rc.d/init.d/network 
rootfs/etc/rc.d/init.d/network
--- rpm/BUILD/skell-1.16/etc/rc.d/init.d/network        2007-06-18 
15:45:44.000000000 +0200
+++ rootfs/etc/rc.d/init.d/network      2009-11-11 16:18:45.000000000 +0100
@@ -24,7 +24,9 @@
    #
    # set up the network interfaces
    #
-    if [ "$IPADDR0" = "" ]
+        ipaddr=`ifconfig eth0 | grep "\<inet addr\>" |\
+                sed -e "s/^.*\<inet addr:\([0-9.]*\) .*/\1/"`;
+    if [ "$IPADDR0" = "" ] && [ $ipaddr = "" ]
    then
        echo ""
        echo "Warning: no IPADDR is set, please set this from the ltib"


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