File dnsmasq-servfail.patch of Package dnsmasq.17856
--- src/forward.c +++ src/forward.c @@ -817,7 +817,7 @@ void reply_query(int fd, int family, time_t now) /* Note: if we send extra options in the EDNS0 header, we can't recreate the query from the reply. */ - if (RCODE(header) == REFUSED && + if ((RCODE(header) == REFUSED || RCODE(header) == SERVFAIL) && forward->forwardall == 0 && !(forward->flags & FREC_HAS_EXTRADATA)) /* for broken servers, attempt to send to another one. */