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S tramadol cheap tting up IP Aliasing on A Linux Machine Mini-HOWTOHarish Pillay h.pillay@ieee tramadol cheap org Joy Yokley - Converted document from HTML to DocBook v4.1 (SGML)2001-01-2 tramadol cheap Revision History tramadol cheap evision 1.2 2001-01-26 Revised by: JEY R tramadol cheap vision 1.1 2001-01-24 Revised by: JEY Re tramadol cheap ision 1.0 1997-01-13 Revised by: HP Thi tramadol cheap is a cookbook recipe on how to set up and run IP aliasing on a Linux boxand tramadol cheap ow to set up the machine to receive e-mail on the aliased IP addresses.------ tramadol cheap ----------------------------------------------------------------------Table o tramadol cheap Contents1. My Setup2. Commands3. Troubleshooting: Questions and Answers 3 tramadol cheap 1. Question: How can I keep the settings through a reboot? 3.2. Question: tramadol cheap ow do I set up the IP aliased machine to receive e-mail on the various tramadol cheap aliased IP addresses (on a machine using sendmail)? 4. Acknowledgements- tramadol cheap ---------------------------------------------------------------------------1. tramadol cheap My Setup * IP Alias is standard in kernels 2.0.x and 2.2.x, and available as tramadol cheap a compile-time option in 2.4.x (IP Alias has been deprecated in 2.4.x and tramadol cheap replaced by a more powerful firewalling mechanism.) * IP Alias compiled tramadol cheap as a loadable module. You would have indicated in the "make config" comman tramadol cheap to make your kernel, that you want the IP Masq to be compiled as a (M)odu tramadol cheap e. Check the Modules HOW-TO (if that exists) or check the info in /usr/src tramadol cheap linux/Documentation/modules.txt. * I have to support 2 additional IPs ove tramadol cheap and above the IP already allocated to me. * A D-Link DE620 pocket ada tramadol cheap ter (not important, works with any Linux supported network adapter). --- tramadol cheap -------------------------------------------------------------------------2. C tramadol cheap mmands 1. Load the IP Alias module (you can skip this step if you compiled th tramadol cheap module into the kernel): /sbin/insmod /lib/modules/`uname -r`/ipv4/ip_ tramadol cheap lias.o 2. Setup the loopback, eth0, and all the IP addresses tramadol cheap eginning with the main IP address for the eth0 interface: /sbin/ifconfi tramadol cheap lo 127.0.0.1 /sbin/ifconfig eth0 up tramadol cheap /sbin/ifconfig eth0 172.16.3.1 tramadol cheap /sbin/ifconfig eth0:0 172.16.3.10 tramadol cheap /sbin/ifconfig eth0:1 172.16.3.100 tramadol cheap 172.16.3.1 is the main IP address, while .10 and .100 a tramadol cheap e the aliases. The magic is the eth0:x where x=0,1,2,...n for the differen tramadol cheap IP addresses. The main IP address does not need to be aliased. 3. Setu tramadol cheap the routes. First route the loopback, then the net, and finally, the vari tramadol cheap us IP addresses starting with the default (originally allocated) one: / tramadol cheap bin/route add -net 127.0.0.0 /sbin/rout tramadol cheap add -net 172.16.3.0 dev eth0 /sbin/route add -ho tramadol cheap t 172.16.3.1 dev eth0 /sbin/route add -host 172.16 tramadol cheap 3.10 dev eth0:0 /sbin/route add -host 172.16.3.100 de tramadol cheap eth0:1 /sbin/route add default gw 172.16.3.200 tramadol cheap That's it. In the example IP address above, I am u tramadol cheap ing the Private IP addresses (RFC1918) for illustrative purposes. Substitute tramadol cheap hem with your own official orprivate IP addresses.The example shows only 3 IP tramadol cheap addresses. The max is defined to be 256 in /usr/include/linux/net_alias.h. 25 tramadol cheap IP addresses on ONE card is a lot :-)!Here's what my /sbin/ifconfig looks li tramadol cheap e:lo Link encap:Local Loopback tramadol cheap inet addr:127.0.0.1 Bcast:127.255.255.255 Mask:255.0. tramadol cheap .0 UP BROADCAST LOOPBACK RUNNING MTU:3584 Metric:1 RX packets:5088 errors:0 dropped:0 overruns:0 TX packets:5088 errors:0 dropped:0 overruns:0 eth0 Link encap:10Mbps Ethernet HWaddr 00:8E:B8:83:19:20 inet addr:172.16.3.1 Bcast:172.16.3.255 Mask:255.255.255.0 UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:334036 errors:0 dropped:0 overruns:0 TX packets:11605 errors:0 dropped:0 overruns:0 Interrupt:7 Base address:0x378
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