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-rw-r--r--networking/udhcp/d6_socket.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/networking/udhcp/d6_socket.c b/networking/udhcp/d6_socket.c
index f9082ee9d..315c8d98a 100644
--- a/networking/udhcp/d6_socket.c
+++ b/networking/udhcp/d6_socket.c
@@ -69,8 +69,12 @@ int FAST_FUNC d6_read_interface(const char *interface, int *ifindex, struct in6_
if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
*ifindex = ifr.ifr_ifindex;
log2("ifindex %d", *ifindex);
- ((uint32_t*)mac)[0] = rand();
- ((uint16_t*)mac)[2] = rand();
+ if (((uint32_t*)mac)[0] == 0) {
+ /* invent a fictitious MAC (once) */
+ ((uint32_t*)mac)[0] = rand();
+ ((uint16_t*)mac)[2] = rand();
+ mac[0] &= 0xfc; /* make sure it's not bcast */
+ }
retval &= (3 - (1<<0));
}
close(fd);