Hi<div><br></div><div>I trying to replace your Apache Httpd with mod_cluster load balancer with Undertow frontend modcluster as part of Wildfly 9.0.1.</div><div><br></div><div>It works fine when I define a 'real' IP address defined in /etc/hosts:</div><div><br></div><div>&nbsp; 127.0.0.1 &nbsp; &nbsp; localhost</div><div>&nbsp; 10.22.62.40 &nbsp;mdzhrnesir01.standard.six-group.net mdzhrnesir01</div><div><br></div><div><br></div><div>But this IP address 10.22.62.117 is not taken by untertow:</div><div><br></div><div>&nbsp; <b>ip addr</b></div><div>&nbsp; .</div><div>&nbsp; 8: bond0: &lt;BROADCAST,MULTICAST,MASTER,UP,LOWER_UP&gt; mtu 1500 qdisc noqueue state UP</div><div>&nbsp; &nbsp; link/ether 00:17:a4:77:f0:b6 brd ff:ff:ff:ff:ff:ff</div><div>&nbsp; &nbsp; inet 10.22.62.40/24 brd 10.22.62.255 scope global bond0</div><div>&nbsp; &nbsp; <b><font color="#ff0000">inet 10.22.62.117/24 scope global secondary bond0</font></b></div><div><br></div><div><br></div><div>I also faced to problem, that running the example presented by Stuart Douglas &nbsp;doesn't work inside a docker container. Even I execute step by step.</div><div><br></div><div>Without digging into the source code, what are the criteria under which Undertow frontend modcluster accepts IP address(es)?&nbsp;</div><div><br></div><div>Do you also have a proposal for configuring Undertow modcluster to listen to two interfaces? Say an internal IP address and an virtual external IP address?</div><div><br></div><div>I think with Apache, we defined 0.0.0.0 and then Apache with mod_cluster was listening on all interfaces, if I remember correctly.</div><div><br></div><div>Thanks a lot in advance</div><div>Ralf</div>