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M.Drochner@fz-juelich.de said:
> the case of an IPv4 route needs to be handled explicitely

The appended patch seems to dtrt. Not that clean yet, just
wanted to show what I mean.

best regards
Matthias





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#
# old_revision [59f7530c4d8331941c3c311163aca3905463e4a6]
#
# patch "sys/netinet6/in6_pcb.c"
#  from [79113b7e49f05853e6eb05bb8b72abff9f00d3c4]
#    to [bc8982db6857980a87d1f36b4c87e5c06fa5ea64]
#
============================================================
--- sys/netinet6/in6_pcb.c	79113b7e49f05853e6eb05bb8b72abff9f00d3c4
+++ sys/netinet6/in6_pcb.c	bc8982db6857980a87d1f36b4c87e5c06fa5ea64
@@ -913,10 +913,19 @@ in6_pcbrtentry(struct in6pcb *in6p)
 	cdst = (const struct sockaddr_in6 *)rtcache_getdst(ro);
 	if (cdst == NULL)
 		;
-	else if (!IN6_ARE_ADDR_EQUAL(&cdst->sin6_addr, &in6p->in6p_faddr))
-		rtcache_free(ro);
-	else
-		rtcache_check(ro);
+	else if (cdst->sin6_family == AF_INET) {
+		KASSERT(IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr));
+		if (bcmp(&((const struct sockaddr_in *)cdst)->sin_addr, 
+			 &in6p->in6p_faddr.s6_addr32[3], 4))
+			rtcache_free(ro);
+		else
+			rtcache_check(ro);
+	} else {
+		if (!IN6_ARE_ADDR_EQUAL(&cdst->sin6_addr, &in6p->in6p_faddr))
+			rtcache_free(ro);
+		else
+			rtcache_check(ro);
+	}
 #ifdef INET
 	if (ro->ro_rt == NULL && IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
 		union {

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