Search Engine: Elastic

Article ID: 132152, created on Jan 29, 2018, last review on Jan 29, 2018

  • Applies to:
  • Operations Automation


All websites hosted on an Apache NG cluster and running on a particular IP (for example, are unavailable from the external network. A web browser is unable to connect to the websites. Connections on the port 80 of the IP address are not accepted.

At the same time, the websites running on other shared IP addresses are available. All web servers are available from the Load Balancer and accept connections on the http/https ports.


The IP address in question is assigned to more than one load balancer:

If trying to disable the corresponding interafce:

[root@HELB01 ~]# ifdown eth0:5

and than activate it again - it fails with the below error:

[root@HELB01 ~]# ifup eth0:5
Error, some other host already uses address


  1. Find the MAC address of the host which has the IP address assigned:

    [root@HELB01 ~]# ping
    PING ( 56(84) bytes of data.
    64 bytes from icmp_seq=1 ttl=64 time=1.45 ms
    [root@HELB01 ~]# arp
    Address                  HWtype  HWaddress           Flags Mask            Iface              ether   00:50:56:8E:2A:14   C                     eth0
  2. Remove the IP address from the host with the found MAC address
  3. Activate the corresponding interface of the Load Balancer:

    [root@HELB01 ~]# ifup eth0:5

5356b422f65bdad1c3e9edca5d74a1ae caea8340e2d186a540518d08602aa065 e12cea1d47a3125d335d68e6d4e15e07

Email subscription for changes to this article
Save as PDF