[TBD]Power of logical interface

Introduction

Laymen explanation

Technical explanation

How to configure

If you have physical interface eth0, you can create sub-interface eth0:0

#ifconfig eth0:0 192.168.1.6 up

Use-cases

• • To run multiple apache servers. For example if you have 100 alias for same interface- eth0:0 – eth0:100 we can assign 100 ips to it. If apache configured on this server, We can use this Ips to mimic as 100 apache servers.

  • To collect more informative stats. If multiple Apache servers are running on same interface (using multiple IPs) , then stats will include same interface name. Instead, if we use sub-interface, then we will have 1-1 mapping between interface and server. It may look trivial, but it will help analysis of logs a lot.

Reference