Skip to main content

Configure udhcpc for Setting IP netmask and Gateway

By
How to Configure udhcpc for Setting IP netmask and Gateway?
Tell udhcpc client to run on eht1 interface with -i option.
Also use -s option to tell udhcpc client to use script from specified path.
/sbin/udhcpc -i eth1 -p /var/run/dhcpClient-wifi.pid -s /usr/share/udhcpc-wifi/default.script &

default.script directs the udhcpc to executes one by one scripts from specified folder ie /usr/share/udhcpc-wifi/
else default folder location for udhcpc script is /usr/share/udhcpc/

For directing IP address to temp file obtained using udhcpc client or for DHCP, do little
modification in sample.bound file.
Here is Sample udhcpc renew script, which will update the ip address, netmask and gatway obtained
by boradcasting. The new values will be updataed in /var/dhcpfile.

#!/bin/sh
# Sample udhcpc renew script

RESOLV_CONF="/etc/resolv.conf"

[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet

echo $ip > /var/dhcpfile
echo $subnet >> /var/dhcpfile

/sbin/ifconfig $interface $ip $BROADCAST $NETMASK

if [ -n "$router" ]
then
echo "deleting routers"
while /sbin/route del default gw 0.0.0.0 dev $interface
do :
done

for i in $router
do
/sbin/route add default gw $i dev $interface
echo $i > /var/dhcp_gw_wifi
done
fi

Same file can be extended to work on multiple interfaces link eth0 eth1 using $interface

example

if [ "$interface" == "eth0" ];
then
echo $ip > /var/dhcpfile
echo $subnet >> /var/dhcpfile
else
echo $ip > /var/dhcpfile1
echo $subnet >> /var/dhcpfile1
fi
Labels:

Comments

Post a Comment

Popular posts from this blog

Remote debugging for ARM target board

By
Remote debugging for ARM target board With GDB one can both trace and modify code and data flow, and otherwise analyze the behavior of code, without explicitly changing any of it. Rather than run a full-blown instance of GDB on the target platform, you can use GDBserver , a program that lets you run GDB on a different machine than the one on which your program is running. The advantage of using GDBserver is that it needs just a fraction of the target resources that GDB consumes, because it implements only the low-level functionality of the debugger -- namely setting breakpoints and accessing the target processor registers and read/write application memory. GDBserver takes control of the application being debugged, and then waits for instructions from a remote instance of GDB running on a development workstation. Remote target needs to have debugging stub (gdbserver), The gdbserver is also referred to as the 'stub' and must be cross-compiled for that targ...
3 comments
Read more

Dotnet, .Net 3.5, 2.0, C# Interview Questions

By
Few questions on dotnet, C# 2.0, 3.5 On Object oriented concepts 1)What is inheritance with e.g 2)What is polymorphism -function overloading -Function overriding -virtual keyword use -Static keyword and use -Abstract classes -Interface -Object 3)What is threading and how do we use in realtime application(cognizant) 4)What is threadpooling, lock, monitor(write code sample) 5)Architecture of current project 6)Session state, diffrent types of state management. 7)What is Application_Start, how it works. 8)Type of authentication in asp.net 9)How to configure ASP.NET application. 10) What is Impersonation. 11) What is WebService, WSDL, UDDI, Discovery, asmx files. 12) How to implement WebService and use it. 13) When to use WebServices. 14) WPF, how to implement(BOA) 15) Testing concvepts. 16) Test attributes 17) Flow of Automation Test Method execution 18) Features of dotnet 3.5 19) CLR, garbage collection 20) Finally block 21) Manifest, Metadata, MSIL 22) Assemblies, Type of assemblies, str...
2 comments
Read more