diff --git a/server/Makefile b/server/Makefile
index 05024afc4..e1b27265e 100644
--- a/server/Makefile
+++ b/server/Makefile
@@ -18,7 +18,7 @@ RM = rm -f
 DOXY = doxygen
 
 # Debug level (if not set via 'make V=?')
-V ?= 6
+V ?= 5
 
 # Some details about the compiled version
 GIT_TAG = $(shell git describe --tags --abbrev=0)
diff --git a/server/include/node.h b/server/include/node.h
index 953c6198c..672e8cb56 100644
--- a/server/include/node.h
+++ b/server/include/node.h
@@ -18,6 +18,7 @@
 #include <netinet/in.h>
 #include <libconfig.h>
 
+#include "msg.h"
 #include "tc.h"
 
 /** The type of a node.
@@ -26,7 +27,7 @@
  */
 enum node_type
 {
-	NODE_INVALID,
+	NODE_UNKNOWN,
 	NODE_SERVER,
 	NODE_WORKSTATION,
 	NODE_SIM_OPAL,
diff --git a/server/src/cfg.c b/server/src/cfg.c
index 55bd34da5..68eb6ba2f 100644
--- a/server/src/cfg.c
+++ b/server/src/cfg.c
@@ -105,11 +105,8 @@ int config_parse_path(config_setting_t *cfg,
 	config_setting_lookup_bool(cfg, "enabled", &enabled);
 	config_setting_lookup_bool(cfg, "reverse", &reverse);
 	config_setting_lookup_float(cfg, "rate", &path->rate);
-
 	path->cfg = cfg;
 
-	debug(3, "Loaded path from '%s' to '%s'", path->in->name, path->out->name);
-
 	if (enabled) {
 		list_add(*paths, path);
 
@@ -199,8 +196,6 @@ int config_parse_node(config_setting_t *cfg,
 
 	list_add(*nodes, node);
 
-	debug(3, "Loaded %s node '%s'", type_str, node->name);
-
 	return 0;
 }
 
diff --git a/server/src/if.c b/server/src/if.c
index b93c8719e..47e0b3bc4 100644
--- a/server/src/if.c
+++ b/server/src/if.c
@@ -26,7 +26,8 @@ int if_getegress(struct sockaddr_in *sa)
 
 	snprintf(cmd, sizeof(cmd), "ip route get %s", inet_ntoa(sa->sin_addr));
 
-	debug(6, "system: %s", cmd);
+	debug(8, "System: %s", cmd);
+
 	FILE *p = popen(cmd, "r");
 	if (!p)
 		return -1;
@@ -57,12 +58,14 @@ int if_getirqs(struct interface *i)
 
 	int n = 0;
 	struct dirent *entry;
-	while((entry = readdir(dir)) && n < IF_IRQ_MAX) {
+	while ((entry = readdir(dir)) && n < IF_IRQ_MAX) {
 		if (entry->d_type & DT_REG) {
 			i->irqs[n++] = atoi(entry->d_name);
 		}
 	}
 
+	debug(7, "Found %u interrupts for interface '%s'", n, i->name);
+
 	closedir(dir);
 	return 0;
 }
@@ -76,15 +79,13 @@ int if_setaffinity(struct interface *i, int affinity)
 		snprintf(filename, sizeof(filename), "/proc/irq/%u/smp_affinity", i->irqs[n]);
 
 		file = fopen(filename, "w");
-		if (!file)
-			continue;
+		if (file) {
+			if (fprintf(file, "%8x", affinity) < 0)
+				error("Failed to set affinity for IRQ %u", i->irqs[n]);
 
-		if (fprintf(file, "%8x", affinity) < 0)
-			error("Failed to set affinity for IRQ %u", i->irqs[n]);
-		else
-			debug(3, "Set affinity of MSI IRQ %u (%s) to %#x", i->irqs[n], i->name, affinity);
-
-		fclose(file);
+			fclose(file);
+			debug(5, "Set affinity of IRQ %u for interface '%s' to %#x", i->irqs[n], i->name, affinity);
+		}
 	}
 
 	return 0;
diff --git a/server/src/msg.c b/server/src/msg.c
index 81f39aa46..3f03c5e35 100644
--- a/server/src/msg.c
+++ b/server/src/msg.c
@@ -56,7 +56,9 @@ int msg_send(struct msg *m, struct node *n)
 		sizeof(struct sockaddr_in)) < 0)
 		perror("Failed sendto");
 
-	debug(10, "Message sent to node %s (%s:%u)", n->name, inet_ntoa(n->remote.sin_addr), ntohs(n->remote.sin_port));
+	debug(10, "Message sent to node %s (%s:%u)", n->name,
+		inet_ntoa(n->remote.sin_addr),
+		ntohs(n->remote.sin_port));
 
 	return 0;
 }
diff --git a/server/src/node.c b/server/src/node.c
index 391483b15..1d05db9d8 100644
--- a/server/src/node.c
+++ b/server/src/node.c
@@ -67,7 +67,7 @@ enum node_type node_lookup_type(const char *str)
 	else if (!strcmp(str, "dsp"))
 		return NODE_SIM_DSP;
 	else
-		return NODE_INVALID;
+		return NODE_UNKNOWN;
 }
 
 struct node* node_lookup_name(const char *str, struct node *nodes)
diff --git a/server/src/server.c b/server/src/server.c
index a6342fdd3..09c90b872 100644
--- a/server/src/server.c
+++ b/server/src/server.c
@@ -116,17 +116,6 @@ static void quit()
 
 int main(int argc, char *argv[])
 {
-	/* Setup signals */
-	struct sigaction sa_quit = {
-		.sa_flags = SA_SIGINFO,
-		.sa_sigaction = quit
-	};
-
-	sigemptyset(&sa_quit.sa_mask);
-	sigaction(SIGTERM, &sa_quit, NULL);
-	sigaction(SIGINT, &sa_quit, NULL);
-	atexit(&quit);
-
 	/* Check arguments */
 	if (argc != 2) {
 		printf("Usage: %s CONFIG\n", argv[0]);
@@ -140,13 +129,25 @@ int main(int argc, char *argv[])
 	info("This is %s %s", BLU("s2ss"), BLU(VERSION));
 	debug(1, "Running with debug level: %u", V);
 
+	/* Check priviledges */
+	if (getuid() != 0)
+		error("The server requires superuser privileges!");
+
+	/* Setup signals */
+	struct sigaction sa_quit = {
+		.sa_flags = SA_SIGINFO,
+		.sa_sigaction = quit
+	};
+
+	sigemptyset(&sa_quit.sa_mask);
+	sigaction(SIGTERM, &sa_quit, NULL);
+	sigaction(SIGINT, &sa_quit, NULL);
+	atexit(&quit);
+
 	/* Parse configuration file */
 	config_init(&config);
 	config_parse(argv[1], &config, &settings, &nodes, &paths, &interfaces);
 
-	if (!paths)
-		error("No paths found. Terminating...");
-
 	/* Check for realtime kernel patch */
 	struct stat st;
 	if (stat("/sys/kernel/realtime", &st))
diff --git a/server/src/tc.c b/server/src/tc.c
index a5210305b..5c8b6ff3e 100644
--- a/server/src/tc.c
+++ b/server/src/tc.c
@@ -19,7 +19,9 @@ int tc_reset(struct interface *i)
 	char cmd[128];
 	snprintf(cmd, sizeof(cmd), "tc qdisc del dev %s root", i->name);
 
-	debug(6, "system: %s", cmd);
+	debug(6, "Reset traffic control for interface '%s'", i->name);
+	debug(8, "System: %s", cmd);
+
 	return system(cmd);
 }
 
@@ -36,7 +38,9 @@ int tc_prio(struct interface *i, tc_hdl_t handle, int bands)
 	for (int i = 0; i < 16; i++)
 		len += snprintf(cmd+len, sizeof(cmd)-len, " %u", priomap[i] + bands);
 
-	debug(6, "system: %s", cmd);
+	debug(6, "Replace master qdisc for interface '%s'", i->name);
+	debug(8, "System: %s", cmd);
+
 	return system(cmd);
 }
 
@@ -64,7 +68,9 @@ int tc_netem(struct interface *i, tc_hdl_t parent, struct netem *em)
 	if (em->valid & TC_NETEM_CORRUPT)
 		len += snprintf(cmd+len, sizeof(cmd)-len, " corrupt %u", em->corrupt);
 
-	debug(6, "system: %s", cmd);
+	debug(6, "Setup netem qdisc for interface '%s'", i->name);
+	debug(8, "System: %s", cmd);
+
 	return system(cmd);
 }
 
@@ -75,7 +81,9 @@ int tc_mark(struct interface *i, tc_hdl_t flowid, int mark)
 		"tc filter add dev %s protocol ip handle %u fw flowid %u:%u",
 		i->name, mark, TC_HDL_MAJ(flowid), TC_HDL_MIN(flowid));
 
-	debug(6, "system: %s", cmd);
+	debug(7, "Add traffic filter to interface '%s': fwmark %u => flowid %u", i->name, mark, flowid);
+	debug(8, "System: %s", cmd);
+
 	return system(cmd);
 
 }