[PATCH 3/3] use a larger starting EDNS UDP size, and add some debug logging

[Tony Finch]

---
 lib/dns/resolver.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c
index 884aeb8..0b48d1a 100644
--- a/lib/dns/resolver.c
+++ b/lib/dns/resolver.c
@@ -2022,10 +2022,10 @@ resquery_send(resquery_t *query) {

 			/*
 			 * We know nothing about the peer's capabilities
-			 * so start with minimal EDNS UDP size.
+			 * so start with moderate EDNS UDP size.
 			 */
 			if (udpsize == 0U)
-				udpsize = 512;
+				udpsize = 1232;

 			if ((flags & DNS_FETCHOPT_EDNSVERSIONSET) != 0) {
 				version = flags & DNS_FETCHOPT_EDNSVERSIONMASK;
@@ -2103,6 +2103,8 @@ resquery_send(resquery_t *query) {
 	 * Record the UDP EDNS size choosen.
 	 */
 	query->udpsize = udpsize;
+	isc_log_write(dns_lctx,	DNS_LOGCATEGORY_RESOLVER, DNS_LOGMODULE_RESOLVER,
+	    ISC_LOG_DEBUG(10), "fctx %p(%s): udpsize %d", fctx, fctx->info, udpsize);

 	if (udpsize > 0)
 		add_triededns(fctx, &query->addrinfo->sockaddr);
-- 
2.1.0.rc0.187.g3b9072a