no need to count interfaces on old pcap format, because it doesn't support this
@@ -3275,7 +3275,6 @@ static uint8_t packet[MAXPACPSNAPLEN];
printf("reading from %s...\n", basename(pcapinname));
iface = 1;
-memset(&packet, 0, MAXPACPSNAPLEN);
res = read(fd, &pcapfhdr, PCAPHDR_SIZE);
if(res != PCAPHDR_SIZE)
{
