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S online fioricet tting up IP Aliasing on A Linux Machine Mini-HOWTOH online fioricet rish Pillay h.pillay@ieee.org Joy Yokley - Converte online fioricet document from HTML to DocBook v4.1 (SGML)2001-01-2 online fioricet Revision History online fioricet Revision 1.2 200 online fioricet -01-26 Revised by: JEY R online fioricet vision 1.1 2001-01-24 Revised online fioricet y: JEY Revision 1.0 1997- online fioricet 1-13 Revised by: HP Thi online fioricet is a cookbook recipe on how to set up and run IP a online fioricet iasing on a Linux boxand how to set up the machine online fioricet o receive e-mail on the aliased IP addresses.------ online fioricet --------------------------------------------------- online fioricet ------------------Table of Contents1. My Setup2. Co online fioricet mands3. Troubleshooting: Questions and Answers 3 online fioricet 1. Question: How can I keep the settings through a online fioricet eboot? 3.2. Question: How do I set up the IP ali online fioricet sed machine to receive e-mail on the various online fioricet aliased IP addresses (on a machine using sendmail)? online fioricet 4. Acknowledgements--------------------------- online fioricet -------------------------------------------------1. online fioricet My Setup * IP Alias is standard in kernels 2.0.x a online fioricet d 2.2.x, and available as a compile-time option online fioricet n 2.4.x (IP Alias has been deprecated in 2.4.x and online fioricet replaced by a more powerful firewalling mechanism online fioricet ) * IP Alias compiled as a loadable module. You online fioricet would have indicated in the "make config" comman online fioricet to make your kernel, that you want the IP Masq to online fioricet be compiled as a (M)odule. Check the Modules HOW- online fioricet O (if that exists) or check the info in /usr/src online fioricet linux/Documentation/modules.txt. * I have to su online fioricet port 2 additional IPs over and above the IP already online fioricet allocated to me. * A D-Link DE620 pocket ada online fioricet ter (not important, works with any Linux support online fioricet d network adapter). ----------------------------- online fioricet -----------------------------------------------2. C online fioricet mmands 1. Load the IP Alias module (you can skip th online fioricet s step if you compiled the module into the kerne online fioricet ): /sbin/insmod /lib/modules/`uname -r`/ipv4/ip_ online fioricet lias.o 2. Setup the loopback, eth0, online fioricet and all the IP addresses beginning with the main online fioricet IP address for the eth0 interface: /sbin/ifconfi online fioricet lo 127.0.0.1 online fioricet /sbin/ifconfig eth0 up online fioricet /sbin/ifconfig eth0 172.16.3.1 online fioricet /sbin/ifconfig online fioricet eth0:0 172.16.3.10 online fioricet /sbin/ifconfig eth0:1 172.16.3.100 online fioricet 172.16.3.1 is the main IP add online fioricet ess, while .10 and .100 are the aliases. The magic is the eth0:x where x=0,1,2,...n for the different IP addresses. The main IP address does not need to be aliased. 3. Setup the routes. First route the loopback, then the net, and finally, the various IP addresses starting with the default (originally allocated) one: /sbin/route add -net 127.0.0.0 /sbin/route add -net 172.16.3.0 dev eth0 /sbin/route add -host 172.16.3.1 dev eth0 /sbin/route add -host 172.16.3.10 dev eth0:0 /sbin/route add -host 172.16.3.100 dev eth0:1 /sbin/route add default gw 172.16.3.200 That's it. In the example IP address above, I am using the Private IP addresses (RFC1918) for il
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