diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index ac3580a..e7a17a1 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -5793,8 +5793,8 @@
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             max_frag_len=512" \
-            0 \
+             max_frag_len=1024" \
+             0 \
             -S "found fragmented DTLS handshake message" \
             -c "found fragmented DTLS handshake message" \
             -C "error"
@@ -5811,7 +5811,7 @@
 requires_config_enabled MBEDTLS_ECDSA_C
 requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
 run_test    "DTLS fragmenting: client-initiated, server only (max_frag_len), proxy MTU" \
-            -p "$P_PXY mtu=560" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=none \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
@@ -5819,7 +5819,7 @@
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             max_frag_len=512" \
+             max_frag_len=1024" \
             0 \
             -S "found fragmented DTLS handshake message" \
             -c "found fragmented DTLS handshake message" \
@@ -5837,7 +5837,7 @@
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             max_frag_len=512" \
+             max_frag_len=1024" \
             0 \
             -s "found fragmented DTLS handshake message" \
             -c "found fragmented DTLS handshake message" \
@@ -5855,7 +5855,7 @@
 requires_config_enabled MBEDTLS_ECDSA_C
 requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
 run_test    "DTLS fragmenting: client-initiated, both (max_frag_len), proxy MTU" \
-            -p "$P_PXY mtu=560" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
@@ -5863,7 +5863,7 @@
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             max_frag_len=512" \
+             max_frag_len=1024" \
             0 \
             -s "found fragmented DTLS handshake message" \
             -c "found fragmented DTLS handshake message" \
@@ -5897,7 +5897,7 @@
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             mtu=512" \
+             mtu=1024" \
             0 \
             -s "found fragmented DTLS handshake message" \
             -C "found fragmented DTLS handshake message" \
@@ -5924,7 +5924,7 @@
 requires_config_enabled MBEDTLS_RSA_C
 requires_config_enabled MBEDTLS_ECDSA_C
 run_test    "DTLS fragmenting: both (MTU)" \
-            -p "$P_PXY mtu=512" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
@@ -5932,7 +5932,7 @@
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             mtu=512" \
+             mtu=1024" \
             0 \
             -s "found fragmented DTLS handshake message" \
             -c "found fragmented DTLS handshake message" \
@@ -5944,7 +5944,7 @@
 requires_config_enabled MBEDTLS_RSA_C
 requires_config_enabled MBEDTLS_ECDSA_C
 run_test    "DTLS fragmenting: proxy MTU: auto-reduction" \
-            -p "$P_PXY mtu=508" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key\
@@ -5985,15 +5985,15 @@
 requires_config_enabled MBEDTLS_RSA_C
 requires_config_enabled MBEDTLS_ECDSA_C
 run_test    "DTLS fragmenting: proxy MTU, simple handshake" \
-            -p "$P_PXY mtu=512" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
-             mtu=512" \
+             mtu=1024" \
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             mtu=512" \
+             mtu=1024" \
             0 \
             -S "resend" \
             -s "found fragmented DTLS handshake message" \
@@ -6005,15 +6005,15 @@
 requires_config_enabled MBEDTLS_RSA_C
 requires_config_enabled MBEDTLS_ECDSA_C
 run_test    "DTLS fragmenting: proxy MTU, simple handshake, nbio" \
-            -p "$P_PXY mtu=512" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
-             mtu=512 nbio=2" \
+             mtu=1024 nbio=2" \
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             mtu=512 nbio=2" \
+             mtu=1024 nbio=2" \
             0 \
             -S "resend" \
             -s "found fragmented DTLS handshake message" \
@@ -6034,15 +6034,15 @@
 requires_config_enabled MBEDTLS_RSA_C
 requires_config_enabled MBEDTLS_ECDSA_C
 run_test    "DTLS fragmenting: proxy MTU, resumed handshake" \
-            -p "$P_PXY mtu=1450" \
+            -p "$P_PXY mtu=1650" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
-             mtu=1450" \
+             mtu=1650" \
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             mtu=1450 reconnect=1 reco_delay=1" \
+             mtu=1650 reconnect=1 reco_delay=1" \
             0 \
             -S "resend" \
             -s "found fragmented DTLS handshake message" \
@@ -6060,18 +6060,18 @@
 requires_config_enabled MBEDTLS_SSL_RENEGOTIATION
 requires_config_enabled MBEDTLS_CHACHAPOLY_C
 run_test    "DTLS fragmenting: proxy MTU, ChachaPoly renego" \
-            -p "$P_PXY mtu=512" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
              exchanges=2 renegotiation=1 \
              force_ciphersuite=TLS-ECDHE-ECDSA-WITH-CHACHA20-POLY1305-SHA256 \
-             mtu=512" \
+             mtu=1024" \
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
              exchanges=2 renegotiation=1 renegotiate=1 \
-             mtu=512" \
+             mtu=1024" \
             0 \
             -S "resend" \
             -s "found fragmented DTLS handshake message" \
@@ -6090,18 +6090,18 @@
 requires_config_enabled MBEDTLS_AES_C
 requires_config_enabled MBEDTLS_GCM_C
 run_test    "DTLS fragmenting: proxy MTU, AES-GCM renego" \
-            -p "$P_PXY mtu=512" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
              exchanges=2 renegotiation=1 \
              force_ciphersuite=TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256 \
-             mtu=512" \
+             mtu=1024" \
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
              exchanges=2 renegotiation=1 renegotiate=1 \
-             mtu=512" \
+             mtu=1024" \
             0 \
             -S "resend" \
             -s "found fragmented DTLS handshake message" \
@@ -6120,18 +6120,18 @@
 requires_config_enabled MBEDTLS_AES_C
 requires_config_enabled MBEDTLS_CCM_C
 run_test    "DTLS fragmenting: proxy MTU, AES-CCM renego" \
-            -p "$P_PXY mtu=512" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
              exchanges=2 renegotiation=1 \
              force_ciphersuite=TLS-ECDHE-ECDSA-WITH-AES-128-CCM-8 \
-             mtu=512" \
+             mtu=1024" \
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
              exchanges=2 renegotiation=1 renegotiate=1 \
-             mtu=512" \
+             mtu=1024" \
             0 \
             -S "resend" \
             -s "found fragmented DTLS handshake message" \
@@ -6151,18 +6151,18 @@
 requires_config_enabled MBEDTLS_CIPHER_MODE_CBC
 requires_config_enabled MBEDTLS_SSL_ENCRYPT_THEN_MAC
 run_test    "DTLS fragmenting: proxy MTU, AES-CBC EtM renego" \
-            -p "$P_PXY mtu=512" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
              exchanges=2 renegotiation=1 \
              force_ciphersuite=TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA256 \
-             mtu=512" \
+             mtu=1024" \
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
              exchanges=2 renegotiation=1 renegotiate=1 \
-             mtu=512" \
+             mtu=1024" \
             0 \
             -S "resend" \
             -s "found fragmented DTLS handshake message" \
@@ -6181,18 +6181,18 @@
 requires_config_enabled MBEDTLS_AES_C
 requires_config_enabled MBEDTLS_CIPHER_MODE_CBC
 run_test    "DTLS fragmenting: proxy MTU, AES-CBC non-EtM renego" \
-            -p "$P_PXY mtu=512" \
+            -p "$P_PXY mtu=1024" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
              exchanges=2 renegotiation=1 \
              force_ciphersuite=TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA256 etm=0 \
-             mtu=512" \
+             mtu=1024" \
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
              exchanges=2 renegotiation=1 renegotiate=1 \
-             mtu=512" \
+             mtu=1024" \
             0 \
             -S "resend" \
             -s "found fragmented DTLS handshake message" \
@@ -6204,15 +6204,15 @@
 requires_config_enabled MBEDTLS_ECDSA_C
 client_needs_more_time 2
 run_test    "DTLS fragmenting: proxy MTU + 3d" \
-            -p "$P_PXY mtu=512 drop=8 delay=8 duplicate=8" \
+            -p "$P_PXY mtu=1024 drop=8 delay=8 duplicate=8" \
             "$P_SRV dgram_packing=0 dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
-             hs_timeout=250-10000 mtu=512" \
+             hs_timeout=250-10000 mtu=1024" \
             "$P_CLI dgram_packing=0 dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             hs_timeout=250-10000 mtu=512" \
+             hs_timeout=250-10000 mtu=1024" \
             0 \
             -s "found fragmented DTLS handshake message" \
             -c "found fragmented DTLS handshake message" \
@@ -6223,15 +6223,15 @@
 requires_config_enabled MBEDTLS_ECDSA_C
 client_needs_more_time 2
 run_test    "DTLS fragmenting: proxy MTU + 3d, nbio" \
-            -p "$P_PXY mtu=512 drop=8 delay=8 duplicate=8" \
+            -p "$P_PXY mtu=1024 drop=8 delay=8 duplicate=8" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
              key_file=data_files/server7.key \
-             hs_timeout=250-10000 mtu=512 nbio=2" \
+             hs_timeout=250-10000 mtu=1024 nbio=2" \
             "$P_CLI dtls=1 debug_level=2 \
              crt_file=data_files/server8_int-ca2.crt \
              key_file=data_files/server8.key \
-             hs_timeout=250-10000 mtu=512 nbio=2" \
+             hs_timeout=250-10000 mtu=1024 nbio=2" \
             0 \
             -s "found fragmented DTLS handshake message" \
             -c "found fragmented DTLS handshake message" \