Linux / FreeBSD: Multiple IP Addresses on One Interface

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Q. Can one Linux / BSD system respond to multiple IP address on a single Ethernet interface? I need to run multiple web sites and mod_ssl with a single server. How do I configure my box for multiple IP address?

A. Linux / UNIX and BSD like operating systems supports multiple IP address on a single interface using a feature called ip aliasing. You can add extra IP addresses with the ifconfig command. However, I recommend modifying configuration files so that operating system remember all ips after reboot.

See our previous FAQ and How-tos about IP aliasing:

  1. FreeBSD Setup 2 IP address on One NIC ( IP alias )
  2. How to bind a range of IP’s in Debian / Ubuntu Linux
  3. Red Hat / CentOS / Fedora Linux add multiple IP address

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

1 comment

  1. Hi,
    it appears that You don’t have to have multiple ip’s to achieve this.You can do pretty much the same using TLS Extensions.Take a look:

    Link

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