diff -ur darkstat-2.6/src/acct.c darkstat-2.6-patched/src/acct.c
--- darkstat-2.6/src/acct.c	2003-11-07 09:47:00.000000000 +0100
+++ darkstat-2.6-patched/src/acct.c	2004-07-16 18:34:19.070212872 +0200
@@ -20,11 +20,13 @@
 #if defined(sun) && (defined(__svr4__) || defined(__SVR4)) 
 #include <sys/sockio.h>
 #endif
+#include <errno.h>
 
 int64	num_packets, total_data;
-dword	local_ip = 0, lan_ip = 0xFFFFFFFF, lan_mask = 0;
+dword	local_ip = 0, lan_ip = 0xFFFFFFFF, lan_mask = 0, check_ip = 0;
 int	acct_linktype = 0;
-time_t	t_start, t_already = 0, t_lastsave = 0;
+time_t	t_start, t_already = 0, t_lastsave = 0, t_lastipcheck = 0;
+int network_down = 0;
 pcap_t	*acct_pcap = NULL;
 host_record *local_host_rec;
 
@@ -367,22 +369,10 @@
 }
 
 
-
-void acct_main(void *ignored unused)
+void init_pcap(void)
 {
 	char err[PCAP_ERRBUF_SIZE];
 
-	if (!local_ip) local_ip = get_local_ip(acctdev);
-	printf("Sniffing on device %s, local IP is ", acctdev);
-	print_addr(local_ip);
-	putchar('\n');
-
-	init_db();
-	init_graph();
-	load_db(db_file);
-
-	local_host_rec = host_from_ip(local_ip);
-
 	err[0] = '\0'; /* zero length string */
 	acct_pcap = pcap_open_live(acctdev, 100, promisc, PCAP_TIMEOUT, err);
 	if (!acct_pcap)
@@ -418,7 +408,23 @@
 #endif
 	}
 
+}
+	
+
+void acct_main(void *ignored unused)
+{
+	if (!local_ip) local_ip = get_local_ip(acctdev);
+	printf("Sniffing on device %s, local IP is ", acctdev);
+	print_addr(local_ip);
+	putchar('\n');
+
+	init_db();
+	init_graph();
+	load_db(db_file);
+
+	local_host_rec = host_from_ip(local_ip);
 
+	init_pcap();
 
 	t_lastsave = t_start = time(NULL);
 	acct_linktype = pcap_datalink(acct_pcap);
@@ -432,13 +438,38 @@
 	{
 		struct pcap_stat ps;
 
+		/* check if we still have the same IP from time to time */
+		if (time(NULL) - t_lastipcheck > IPCHECK_TIME)
+		{
+			t_lastipcheck = time(NULL);
+			check_ip = get_local_ip(acctdev);
+			if (local_ip != check_ip)
+			{
+				printf("New IP ");
+				print_addr(check_ip);
+				printf(" detected, old IP was ");
+				print_addr(local_ip);
+				putchar('\n');
+				local_ip = check_ip;
+				network_down = 0;
+				init_pcap();
+			}
+		}
+
+		if (network_down)
+			continue;
+		
 		/* capture some packets for accounting */
 		if (pcap_dispatch(acct_pcap, -1,
 			(pcap_handler)handle_pkt, NULL) == -1)
 		{
 			printf("Error: pcap_dispatch(): %s\n",
 				pcap_geterr(acct_pcap));
-			FAIL();
+			if (errno == ENETDOWN) {
+				network_down = 1;
+			} else {
+				FAIL();
+			}
 		}
 
 		/* print out cap statistics */	
diff -ur darkstat-2.6/src/darkstat.h darkstat-2.6-patched/src/darkstat.h
--- darkstat-2.6/src/darkstat.h	2003-11-07 09:51:19.000000000 +0100
+++ darkstat-2.6-patched/src/darkstat.h	2004-07-16 18:35:50.738277208 +0200
@@ -52,6 +52,7 @@
 #define EXIT_SUCCESS 0
 #define EXIT_FAIL 1
 #define SAVE_TIME 60*5 /* secs inbetween DB dumps */
+#define IPCHECK_TIME 60	/* seconds between local ip checks */
 #define MSEC 1000  /* for usleep() */
 #define SOCKET int /* WinSock? err... */