diff --git a/src/pvxs/server.h b/src/pvxs/server.h
index 6f6abce..aee7209 100644
--- a/src/pvxs/server.h
+++ b/src/pvxs/server.h
@@ -8,6 +8,7 @@
 
 #include <osiSock.h>
 
+#include <ostream>
 #include <functional>
 #include <string>
 #include <tuple>
@@ -57,6 +58,9 @@ struct Config {
     Server build();
 };
 
+PVXS_API
+std::ostream& operator<<(std::ostream& strm, const Config& conf);
+
 /** PV Access protocol server instance
  *
  * Use a Config to determine how this server will bind, listen,
diff --git a/src/server.cpp b/src/server.cpp
index 7093301..90baf17 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -126,6 +126,41 @@ Server Config::build()
     return ret;
 }
 
+std::ostream& operator<<(std::ostream& strm, const Config& conf)
+{
+    bool first;
+
+    strm<<"EPICS_PVAS_INTF_ADDR_LIST=\"";
+    first = true;
+    for(auto& iface : conf.interfaces) {
+        if(first)
+            first = false;
+        else
+            strm<<' ';
+        strm<<iface;
+    }
+    strm<<"\"\n";
+
+    strm<<"EPICS_PVAS_BEACON_ADDR_LIST=\"";
+    first = true;
+    for(auto& iface : conf.beaconDestinations) {
+        if(first)
+            first = false;
+        else
+            strm<<' ';
+        strm<<iface;
+    }
+    strm<<"\"\n";
+
+    strm<<"EPICS_PVAS_AUTO_BEACON_ADDR_LIST="<<(conf.auto_beacon?"YES":"NO")<<'\n';
+
+    strm<<"EPICS_PVAS_SERVER_PORT="<<conf.tcp_port<<'\n';
+
+    strm<<"EPICS_PVAS_BROADCAST_PORT="<<conf.udp_port<<'\n';
+
+    return strm;
+}
+
 Server::Server(Config&& conf)
 {
     /* Here be dragons.
diff --git a/test/countdown.cpp b/test/countdown.cpp
index e0f6ed8..79973ae 100644
--- a/test/countdown.cpp
+++ b/test/countdown.cpp
@@ -121,12 +121,7 @@ int main(int argc, char *argv[])
                 .build()
                 .addSource("countdown", src);
 
-        auto& conf = serv.config();
-
-        std::cout<<"Serving from :\n";
-        for(auto& iface : conf.interfaces) {
-            std::cout<<"  "<<iface<<"\n";
-        }
+        std::cout<<"Effective config\n"<<serv.config();
 
         log_printf(app, Info, "Running\n%s", "");
         serv.run();
diff --git a/test/dummyserv.cpp b/test/dummyserv.cpp
index 71d12c1..db5e7a4 100644
--- a/test/dummyserv.cpp
+++ b/test/dummyserv.cpp
@@ -143,12 +143,7 @@ int main(int argc, char *argv[])
                 .build()
                 .addSource("dummy", src);
 
-        auto& conf = serv.config();
-
-        std::cout<<"Serving from :\n";
-        for(auto& iface : conf.interfaces) {
-            std::cout<<"  "<<iface<<"\n";
-        }
+        std::cout<<"Effective config\n"<<serv.config();
 
         serv.run();
 
diff --git a/test/mailbox.cpp b/test/mailbox.cpp
index 319a93b..d552604 100644
--- a/test/mailbox.cpp
+++ b/test/mailbox.cpp
@@ -47,12 +47,7 @@ int main(int argc, char* argv[])
             .build()
             .addPV(argv[1], pv);
 
-    auto& conf = serv.config();
-
-    std::cout<<"Serving from :\n";
-    for(auto& iface : conf.interfaces) {
-        std::cout<<"  "<<iface<<"\n";
-    }
+    std::cout<<"Effective config\n"<<serv.config();
 
     log_printf(app, Info, "Running\n%s", "");
     serv.run();
diff --git a/test/mcat.cpp b/test/mcat.cpp
index 6915b10..10c2b99 100644
--- a/test/mcat.cpp
+++ b/test/mcat.cpp
@@ -156,12 +156,7 @@ int main(int argc, char* argv[])
             .build()
             .addSource("mcat", src);
 
-    auto& conf = serv.config();
-
-    std::cout<<"Serving from :\n";
-    for(auto& iface : conf.interfaces) {
-        std::cout<<"  "<<iface<<"\n";
-    }
+    std::cout<<"Effective config\n"<<serv.config();
 
     log_printf(app, Info, "Running\n%s", "");
     serv.run();