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https://bugs.gentoo.org/471142
snipped from fedora
# dhclient -6: bind socket to interface (#1001742)
# (Submitted to dhcp-bugs@isc.org - [ISC-Bugs #34784])
--- a/common/socket.c
+++ b/common/socket.c
@@ -266,7 +266,7 @@
#if defined(SO_BINDTODEVICE)
/* Bind this socket to this interface. */
- if ((local_family != AF_INET6) && (info->ifp != NULL) &&
+ if (((do_multicast == 0)||(*do_multicast == 0)) && (info->ifp != NULL) &&
setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
(char *)(info -> ifp), sizeof(*(info -> ifp))) < 0) {
log_fatal("Can't set SO_BINDTODEVICE on dhcp socket for"
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