diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index abb8d8f..9b8ef55 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -5310,11 +5310,11 @@
 client_needs_more_time 2
 run_test    "DTLS fragmenting: proxy MTU + 3d" \
             -p "$P_PXY mtu=512 drop=8 delay=8 duplicate=8" \
-            "$P_SRV dtls=1 debug_level=2 auth_mode=required \
+            "$P_SRV dgram_packing=0 dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
              mtu=512" \
-            "$P_CLI dtls=1 debug_level=2 \
+            "$P_CLI dgram_packing=0 dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
              mtu=512" \
@@ -5452,7 +5452,7 @@
 run_test    "DTLS fragmenting: 3d, gnutls server, DTLS 1.2" \
             -p "$P_PXY drop=8 delay=8 duplicate=8" \
             "$G_NEXT_SRV -u" \
-            "$P_CLI dtls=1 debug_level=2 \
+            "$P_CLI dgram_packing=0 dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
              mtu=512 force_version=dtls1_2" \
@@ -5469,7 +5469,7 @@
 run_test    "DTLS fragmenting: 3d, gnutls server, DTLS 1.0" \
             -p "$P_PXY drop=8 delay=8 duplicate=8" \
             "$G_NEXT_SRV -u" \
-            "$P_CLI dtls=1 debug_level=2 \
+            "$P_CLI dgram_packing=0 dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
              mtu=512 force_version=dtls1_2" \
@@ -5550,7 +5550,7 @@
 run_test    "DTLS fragmenting: 3d, openssl server, DTLS 1.0" \
             -p "$P_PXY drop=8 delay=8 duplicate=8" \
             "$O_LEGACY_SRV -dtls1 -verify 10" \
-            "$P_CLI dtls=1 debug_level=2 \
+            "$P_CLI dgram_packing=0 dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
              mtu=512 force_version=dtls1" \
@@ -5583,7 +5583,7 @@
 client_needs_more_time 2
 run_test    "DTLS fragmenting: 3d, openssl client, DTLS 1.0" \
             -p "$P_PXY drop=8 delay=8 duplicate=8" \
-            "$P_SRV dtls=1 debug_level=2 \
+            "$P_SRV dgram_packing=0 dtls=1 debug_level=2 \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
              mtu=512 force_version=dtls1" \
@@ -5612,8 +5612,8 @@
 not_with_valgrind # spurious resend due to timeout
 run_test    "DTLS proxy: duplicate every packet" \
             -p "$P_PXY duplicate=1" \
-            "$P_SRV dtls=1 debug_level=2" \
-            "$P_CLI dtls=1 debug_level=2" \
+            "$P_SRV dtls=1 dgram_packing=0 debug_level=2" \
+            "$P_CLI dtls=1 dgram_packing=0 debug_level=2" \
             0 \
             -c "replayed record" \
             -s "replayed record" \
@@ -5625,8 +5625,8 @@
 
 run_test    "DTLS proxy: duplicate every packet, server anti-replay off" \
             -p "$P_PXY duplicate=1" \
-            "$P_SRV dtls=1 debug_level=2 anti_replay=0" \
-            "$P_CLI dtls=1 debug_level=2" \
+            "$P_SRV dtls=1 dgram_packing=0 debug_level=2 anti_replay=0" \
+            "$P_CLI dtls=1 dgram_packing=0 debug_level=2" \
             0 \
             -c "replayed record" \
             -S "replayed record" \
@@ -5639,24 +5639,24 @@
 
 run_test    "DTLS proxy: multiple records in same datagram" \
             -p "$P_PXY pack=50" \
-            "$P_SRV dtls=1 debug_level=2" \
-            "$P_CLI dtls=1 debug_level=2" \
+            "$P_SRV dtls=1 dgram_packing=0 debug_level=2" \
+            "$P_CLI dtls=1 dgram_packing=0 debug_level=2" \
             0 \
             -c "next record in same datagram" \
             -s "next record in same datagram"
 
 run_test    "DTLS proxy: multiple records in same datagram, duplicate every packet" \
             -p "$P_PXY pack=50 duplicate=1" \
-            "$P_SRV dtls=1 debug_level=2" \
-            "$P_CLI dtls=1 debug_level=2" \
+            "$P_SRV dtls=1 dgram_packing=0 debug_level=2" \
+            "$P_CLI dtls=1 dgram_packing=0 debug_level=2" \
             0 \
             -c "next record in same datagram" \
             -s "next record in same datagram"
 
 run_test    "DTLS proxy: inject invalid AD record, default badmac_limit" \
             -p "$P_PXY bad_ad=1" \
-            "$P_SRV dtls=1 debug_level=1" \
-            "$P_CLI dtls=1 debug_level=1 read_timeout=100" \
+            "$P_SRV dtls=1 dgram_packing=0 debug_level=1" \
+            "$P_CLI dtls=1 dgram_packing=0 debug_level=1 read_timeout=100" \
             0 \
             -c "discarding invalid record (mac)" \
             -s "discarding invalid record (mac)" \
@@ -5667,8 +5667,8 @@
 
 run_test    "DTLS proxy: inject invalid AD record, badmac_limit 1" \
             -p "$P_PXY bad_ad=1" \
-            "$P_SRV dtls=1 debug_level=1 badmac_limit=1" \
-            "$P_CLI dtls=1 debug_level=1 read_timeout=100" \
+            "$P_SRV dtls=1 dgram_packing=0 debug_level=1 badmac_limit=1" \
+            "$P_CLI dtls=1 dgram_packing=0 debug_level=1 read_timeout=100" \
             1 \
             -C "discarding invalid record (mac)" \
             -S "discarding invalid record (mac)" \
@@ -5679,8 +5679,8 @@
 
 run_test    "DTLS proxy: inject invalid AD record, badmac_limit 2" \
             -p "$P_PXY bad_ad=1" \
-            "$P_SRV dtls=1 debug_level=1 badmac_limit=2" \
-            "$P_CLI dtls=1 debug_level=1 read_timeout=100" \
+            "$P_SRV dtls=1 dgram_packing=0 debug_level=1 badmac_limit=2" \
+            "$P_CLI dtls=1 dgram_packing=0 debug_level=1 read_timeout=100" \
             0 \
             -c "discarding invalid record (mac)" \
             -s "discarding invalid record (mac)" \
@@ -5691,8 +5691,8 @@
 
 run_test    "DTLS proxy: inject invalid AD record, badmac_limit 2, exchanges 2"\
             -p "$P_PXY bad_ad=1" \
-            "$P_SRV dtls=1 debug_level=1 badmac_limit=2 exchanges=2" \
-            "$P_CLI dtls=1 debug_level=1 read_timeout=100 exchanges=2" \
+            "$P_SRV dtls=1 dgram_packing=0 debug_level=1 badmac_limit=2 exchanges=2" \
+            "$P_CLI dtls=1 dgram_packing=0 debug_level=1 read_timeout=100 exchanges=2" \
             1 \
             -c "discarding invalid record (mac)" \
             -s "discarding invalid record (mac)" \
@@ -5716,9 +5716,9 @@
 client_needs_more_time 2
 run_test    "DTLS proxy: 3d (drop, delay, duplicate), \"short\" PSK handshake" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=none \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=none \
              psk=abc123" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0 psk=abc123 \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 psk=abc123 \
              force_ciphersuite=TLS-PSK-WITH-AES-128-CCM-8" \
             0 \
             -s "Extra-header:" \
@@ -5727,8 +5727,8 @@
 client_needs_more_time 2
 run_test    "DTLS proxy: 3d, \"short\" RSA handshake" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=none" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0 \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=none" \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 \
              force_ciphersuite=TLS-RSA-WITH-AES-128-CBC-SHA" \
             0 \
             -s "Extra-header:" \
@@ -5737,8 +5737,8 @@
 client_needs_more_time 2
 run_test    "DTLS proxy: 3d, \"short\" (no ticket, no cli_auth) FS handshake" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=none" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0" \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=none" \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0" \
             0 \
             -s "Extra-header:" \
             -c "HTTP/1.0 200 OK"
@@ -5746,8 +5746,8 @@
 client_needs_more_time 2
 run_test    "DTLS proxy: 3d, FS, client auth" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=required" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0" \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=required" \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0" \
             0 \
             -s "Extra-header:" \
             -c "HTTP/1.0 200 OK"
@@ -5755,8 +5755,8 @@
 client_needs_more_time 2
 run_test    "DTLS proxy: 3d, FS, ticket" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=1 auth_mode=none" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=1" \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=1 auth_mode=none" \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=1" \
             0 \
             -s "Extra-header:" \
             -c "HTTP/1.0 200 OK"
@@ -5764,8 +5764,8 @@
 client_needs_more_time 2
 run_test    "DTLS proxy: 3d, max handshake (FS, ticket + client auth)" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=1 auth_mode=required" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=1" \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=1 auth_mode=required" \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=1" \
             0 \
             -s "Extra-header:" \
             -c "HTTP/1.0 200 OK"
@@ -5773,9 +5773,9 @@
 client_needs_more_time 2
 run_test    "DTLS proxy: 3d, max handshake, nbio" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 nbio=2 tickets=1 \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 nbio=2 tickets=1 \
              auth_mode=required" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 nbio=2 tickets=1" \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 nbio=2 tickets=1" \
             0 \
             -s "Extra-header:" \
             -c "HTTP/1.0 200 OK"
@@ -5783,9 +5783,9 @@
 client_needs_more_time 4
 run_test    "DTLS proxy: 3d, min handshake, resumption" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=none \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=none \
              psk=abc123 debug_level=3" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0 psk=abc123 \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 psk=abc123 \
              debug_level=3 reconnect=1 read_timeout=1000 max_resend=10 \
              force_ciphersuite=TLS-PSK-WITH-AES-128-CCM-8" \
             0 \
@@ -5797,9 +5797,9 @@
 client_needs_more_time 4
 run_test    "DTLS proxy: 3d, min handshake, resumption, nbio" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=none \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=none \
              psk=abc123 debug_level=3 nbio=2" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0 psk=abc123 \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 psk=abc123 \
              debug_level=3 reconnect=1 read_timeout=1000 max_resend=10 \
              force_ciphersuite=TLS-PSK-WITH-AES-128-CCM-8 nbio=2" \
             0 \
@@ -5812,9 +5812,9 @@
 requires_config_enabled MBEDTLS_SSL_RENEGOTIATION
 run_test    "DTLS proxy: 3d, min handshake, client-initiated renego" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=none \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=none \
              psk=abc123 renegotiation=1 debug_level=2" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0 psk=abc123 \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 psk=abc123 \
              renegotiate=1 debug_level=2 \
              force_ciphersuite=TLS-PSK-WITH-AES-128-CCM-8" \
             0 \
@@ -5827,9 +5827,9 @@
 requires_config_enabled MBEDTLS_SSL_RENEGOTIATION
 run_test    "DTLS proxy: 3d, min handshake, client-initiated renego, nbio" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=none \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=none \
              psk=abc123 renegotiation=1 debug_level=2" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0 psk=abc123 \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 psk=abc123 \
              renegotiate=1 debug_level=2 \
              force_ciphersuite=TLS-PSK-WITH-AES-128-CCM-8" \
             0 \
@@ -5842,10 +5842,10 @@
 requires_config_enabled MBEDTLS_SSL_RENEGOTIATION
 run_test    "DTLS proxy: 3d, min handshake, server-initiated renego" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=none \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=none \
              psk=abc123 renegotiate=1 renegotiation=1 exchanges=4 \
              debug_level=2" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0 psk=abc123 \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 psk=abc123 \
              renegotiation=1 exchanges=4 debug_level=2 \
              force_ciphersuite=TLS-PSK-WITH-AES-128-CCM-8" \
             0 \
@@ -5858,10 +5858,10 @@
 requires_config_enabled MBEDTLS_SSL_RENEGOTIATION
 run_test    "DTLS proxy: 3d, min handshake, server-initiated renego, nbio" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
-            "$P_SRV dtls=1 hs_timeout=250-10000 tickets=0 auth_mode=none \
+            "$P_SRV dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 auth_mode=none \
              psk=abc123 renegotiate=1 renegotiation=1 exchanges=4 \
              debug_level=2 nbio=2" \
-            "$P_CLI dtls=1 hs_timeout=250-10000 tickets=0 psk=abc123 \
+            "$P_CLI dtls=1 dgram_packing=0 hs_timeout=250-10000 tickets=0 psk=abc123 \
              renegotiation=1 exchanges=4 debug_level=2 nbio=2 \
              force_ciphersuite=TLS-PSK-WITH-AES-128-CCM-8" \
             0 \
@@ -5875,7 +5875,7 @@
 run_test    "DTLS proxy: 3d, openssl server" \
             -p "$P_PXY drop=5 delay=5 duplicate=5 protect_hvr=1" \
             "$O_SRV -dtls1 -mtu 2048" \
-            "$P_CLI dtls=1 hs_timeout=250-60000 tickets=0" \
+            "$P_CLI dgram_packing=0 dtls=1 hs_timeout=250-60000 tickets=0" \
             0 \
             -c "HTTP/1.0 200 OK"
 
@@ -5884,7 +5884,7 @@
 run_test    "DTLS proxy: 3d, openssl server, fragmentation" \
             -p "$P_PXY drop=5 delay=5 duplicate=5 protect_hvr=1" \
             "$O_SRV -dtls1 -mtu 768" \
-            "$P_CLI dtls=1 hs_timeout=250-60000 tickets=0" \
+            "$P_CLI dgram_packing=0 dtls=1 hs_timeout=250-60000 tickets=0" \
             0 \
             -c "HTTP/1.0 200 OK"
 
@@ -5893,7 +5893,7 @@
 run_test    "DTLS proxy: 3d, openssl server, fragmentation, nbio" \
             -p "$P_PXY drop=5 delay=5 duplicate=5 protect_hvr=1" \
             "$O_SRV -dtls1 -mtu 768" \
-            "$P_CLI dtls=1 hs_timeout=250-60000 nbio=2 tickets=0" \
+            "$P_CLI dgram_packing=0 dtls=1 hs_timeout=250-60000 nbio=2 tickets=0" \
             0 \
             -c "HTTP/1.0 200 OK"
 
@@ -5903,7 +5903,7 @@
 run_test    "DTLS proxy: 3d, gnutls server" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
             "$G_SRV -u --mtu 2048 -a" \
-            "$P_CLI dtls=1 hs_timeout=250-60000" \
+            "$P_CLI dgram_packing=0 dtls=1 hs_timeout=250-60000" \
             0 \
             -s "Extra-header:" \
             -c "Extra-header:"
@@ -5914,7 +5914,7 @@
 run_test    "DTLS proxy: 3d, gnutls server, fragmentation" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
             "$G_SRV -u --mtu 512" \
-            "$P_CLI dtls=1 hs_timeout=250-60000" \
+            "$P_CLI dgram_packing=0 dtls=1 hs_timeout=250-60000" \
             0 \
             -s "Extra-header:" \
             -c "Extra-header:"
@@ -5925,7 +5925,7 @@
 run_test    "DTLS proxy: 3d, gnutls server, fragmentation, nbio" \
             -p "$P_PXY drop=5 delay=5 duplicate=5" \
             "$G_SRV -u --mtu 512" \
-            "$P_CLI dtls=1 hs_timeout=250-60000 nbio=2" \
+            "$P_CLI dgram_packing=0 dtls=1 hs_timeout=250-60000 nbio=2" \
             0 \
             -s "Extra-header:" \
             -c "Extra-header:"