Index: sys/netinet/netdump/netdump_client.c
===================================================================
--- sys/netinet/netdump/netdump_client.c
+++ sys/netinet/netdump/netdump_client.c
@@ -34,6 +34,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_ddb.h"
+
 #include <sys/param.h>
 #include <sys/conf.h>
 #include <sys/disk.h>
@@ -70,6 +72,10 @@
 #include <machine/in_cksum.h>
 #include <machine/pcb.h>
 
+#ifdef DDB
+#include <ddb/ddb.h>
+#endif
+
 #define	NETDDEBUG(f, ...) do {						\
 	if (nd_debug > 0)						\
 		printf(("%s: " f), __func__, ## __VA_ARGS__);		\
@@ -1306,3 +1312,39 @@
 
 MODULE_VERSION(netdump, 1);
 DECLARE_MODULE(netdump, netdump_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
+
+#ifdef DDB
+DB_SHOW_COMMAND(netdumpconf, db_show_netdumpconf)
+{
+	char ipbuf[sizeof("255.255.255.255")];
+
+	if (!nd_enabled) {
+		db_printf("Netdump isn't enabled.\n");
+		return;
+	}
+
+	db_printf("Netdump is configured on %.*s:\n",
+	    (int)sizeof(nd_conf.ndc_iface), nd_conf.ndc_iface);
+	db_printf(" server: %s:%u\n", inet_ntop(AF_INET,
+	    (void *)&nd_conf.ndc_server, ipbuf, sizeof(ipbuf)),
+	    (unsigned)nd_server_port);
+	db_printf(" client: %s\n", inet_ntop(AF_INET,
+	    (void *)&nd_conf.ndc_client, ipbuf, sizeof(ipbuf)));
+	db_printf(" gateway: %s (%6D)\n", inet_ntop(AF_INET,
+	    (void *)&nd_conf.ndc_gateway, ipbuf, sizeof(ipbuf)),
+	    nd_gw_mac.octet, ":");
+	/* XXX Maybe this bit could be a db_show_dumperinfo in kern_shutdown */
+	db_printf(" generic dump configuration:\n");
+	db_printf("  compresssion: %u\n",
+	    (unsigned)nd_conf.ndc_kda.kda_compression);
+	db_printf("  encryption: %u\n",
+	    (unsigned)nd_conf.ndc_kda.kda_encryption);
+
+	db_printf(" Netdump internals:\n");
+	db_printf("  nd_seqno: %u, nd_ifp: %p\n", (unsigned)nd_seqno, nd_ifp);
+	db_printf("  nd_debug: %d, nd_path: '%.*s'\n", nd_debug,
+	    (int)sizeof(nd_path), nd_path);
+	db_printf("  nd_polls: %d, nd_retries: %d, nd_arp_retries: %d\n",
+	    nd_polls, nd_retries, nd_arp_retries);
+}
+#endif