diff --git a/pmc_common.c b/pmc_common.c
index 0a365f5..d92b0cd 100644
--- a/pmc_common.c
+++ b/pmc_common.c
@@ -85,7 +85,7 @@ struct pmc *pmc_create(struct config *cfg, enum transport_type transport_type,
 	pmc->domain_number = domain_number;
 	pmc->transport_specific = transport_specific;
 
-	pmc->transport = transport_create(transport_type);
+	pmc->transport = transport_create(cfg, transport_type);
 	if (!pmc->transport) {
 		pr_err("failed to create transport");
 		goto failed;
diff --git a/port.c b/port.c
index 3ed5e7b..028df32 100644
--- a/port.c
+++ b/port.c
@@ -2495,6 +2495,7 @@ struct port *port_open(int phc_index,
 		       struct interface *interface,
 		       struct clock *clock)
 {
+	struct config *cfg = clock_config(clock);
 	struct port *p = malloc(sizeof(*p));
 
 	if (!p)
@@ -2524,7 +2525,7 @@ struct port *port_open(int phc_index,
 	p->pod = interface->pod;
 	p->name = interface->name;
 	p->clock = clock;
-	p->trp = transport_create(interface->transport);
+	p->trp = transport_create(cfg, interface->transport);
 	if (!p->trp)
 		goto err_port;
 	p->timestamping = timestamping;
diff --git a/transport.c b/transport.c
index fc18740..d24c05b 100644
--- a/transport.c
+++ b/transport.c
@@ -87,7 +87,8 @@ enum transport_type transport_type(struct transport *t)
 	return t->type;
 }
 
-struct transport *transport_create(enum transport_type type)
+struct transport *transport_create(struct config *cfg,
+				   enum transport_type type)
 {
 	struct transport *t = NULL;
 	switch (type) {
@@ -108,8 +109,10 @@ struct transport *transport_create(enum transport_type type)
 	case TRANS_PROFINET:
 		break;
 	}
-	if (t)
+	if (t) {
 		t->type = type;
+		t->cfg = cfg;
+	}
 	return t;
 }
 
diff --git a/transport.h b/transport.h
index 8e0d421..5d6ba98 100644
--- a/transport.h
+++ b/transport.h
@@ -26,6 +26,8 @@
 #include "fd.h"
 #include "msg.h"
 
+struct config;
+
 /* Values from networkProtocol enumeration 7.4.1 Table 3 */
 enum transport_type {
 	/* 0 is Reserved in spec. Use it for UDS */
@@ -123,10 +125,12 @@ int transport_protocol_addr(struct transport *t, uint8_t *addr);
 
 /**
  * Allocate an instance of the specified transport.
+ * @param config Pointer to the configuration database.
  * @param type  Which transport to obtain.
  * @return      Pointer to a transport instance on success, NULL otherwise.
  */
-struct transport *transport_create(enum transport_type type);
+struct transport *transport_create(struct config *cfg,
+				   enum transport_type type);
 
 /**
  * Free an instance of a transport.
diff --git a/transport_private.h b/transport_private.h
index 3e0ba9a..b54f32a 100644
--- a/transport_private.h
+++ b/transport_private.h
@@ -28,6 +28,7 @@
 
 struct transport {
 	enum transport_type type;
+	struct config *cfg;
 
 	int (*close)(struct transport *t, struct fdarray *fda);