commit 34e26e14c5e0fb2d5f05f67858319c9db2058333
author Simon Kelley <simon@thekelleys.org.uk> Thu May 10 20:54:57 2018 +0100
committer Simon Kelley <simon@thekelleys.org.uk> Thu May 10 20:54:57 2018 +0100
tree aad7728ba24d25b769d04199d5f924f1f000184a
parent 6b17335209639a56f214d011eaed4ebcde8dd276

Retry query to other servers on receipt of SERVFAIL rcode.

src/forward.c

diff --git a/src/forward.c b/src/forward.c
index 79acff5..66b8564 100644
--- a/src/forward.c
+++ b/src/forward.c
@@ -817,7 +817,7 @@
 
   /* 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. */