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The only way you can get to use the other interface is if the original connection comes from that interface. For multi-homed systems what this typically means: 1) Defines a DNS name for the redirector that can only be reached using the desired interface, 2) The above means you need to setup the right IP tables in each subordinate cmsd host. 3) Provide a unique DNS name for each interface that the cmsd can use. If you do the above then the redirector will map the incoming IP address of the cmsd connection to it interface-unique DNS name. That DNS name will be used for redirecting clients. So, clients will use whatever interface was used by the cmsd to connect to the redirector. We do have a request to be able to manually specify the interface mapping and we will be putting it in, though it's very esoteric and trying to explain it will be challenging to people not familiar with multi-homed machine issues. Andy -----Original Message----- From: Brian Bockelman Sent: Tuesday, September 13, 2011 4:12 PM To: xrootd-dev Cc: Max Goncharov Subject: Dual-homed machines in redirector Hi, One of my MIT colleagues (CC'd) is running an Xrootd server on a dual-homed machine. Both interfaces are publicly addressable, and the cmsd is redirecting to the default hostname (t2srv0012). However, to match the grid certificate, we'd like the cmsd to redirect to xrootd1.cmsaf.mit.edu (corresponding to the other interface). Is it possible to accomplish this? Brian