diff --git a/include/configs/apalis_t30.h b/include/configs/apalis_t30.h
index 7e8ffae..27c013b 100644
--- a/include/configs/apalis_t30.h
+++ b/include/configs/apalis_t30.h
@@ -58,6 +58,9 @@
 
 /* General networking support */
 #define CONFIG_CMD_DHCP
+#define CONFIG_IP_DEFRAG
+#define CONFIG_TFTP_BLOCKSIZE		16384
+#define CONFIG_TFTP_TSIZE
 
 /* Miscellaneous commands */
 #define CONFIG_FAT_WRITE
diff --git a/include/configs/colibri_t20.h b/include/configs/colibri_t20.h
index 15bb7b2..09a65d5 100644
--- a/include/configs/colibri_t20.h
+++ b/include/configs/colibri_t20.h
@@ -46,6 +46,9 @@
 
 /* General networking support */
 #define CONFIG_CMD_DHCP
+#define CONFIG_IP_DEFRAG
+#define CONFIG_TFTP_BLOCKSIZE		1536
+#define CONFIG_TFTP_TSIZE
 
 /* LCD support */
 #define CONFIG_LCD
diff --git a/include/configs/colibri_t30.h b/include/configs/colibri_t30.h
index f10fa16..25885d4 100644
--- a/include/configs/colibri_t30.h
+++ b/include/configs/colibri_t30.h
@@ -51,6 +51,9 @@
 
 /* General networking support */
 #define CONFIG_CMD_DHCP
+#define CONFIG_IP_DEFRAG
+#define CONFIG_TFTP_BLOCKSIZE		16384
+#define CONFIG_TFTP_TSIZE
 
 /* Miscellaneous commands */
 #define CONFIG_FAT_WRITE