diff --git a/configs/README.txt b/configs/README.txt
index a3ea2ec3ea8..1c1252688c9 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -229,8 +229,6 @@ defconfig -- This is a configuration file similar to the Linux
 		CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
 		CONFIG_NET_BROADCAST - Broadcast support
 		CONFIG_NET_LLH_LEN - The link level header length
-		CONFIG_NET_EXTERNAL_BUFFER - Incoming packet buffer (uip_buf)
-		  is defined externally
 		CONFIG_NET_FWCACHE_SIZE - number of packets to remember when
 		  looking for duplicates
 
diff --git a/configs/c5471evm/defconfig b/configs/c5471evm/defconfig
index c1490584822..86c8126ecc9 100644
--- a/configs/c5471evm/defconfig
+++ b/configs/c5471evm/defconfig
@@ -268,7 +268,6 @@ CONFIG_PREALLOC_TIMERS=8
 # CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
 # CONFIG_NET_BROADCAST - Broadcast support
 # CONFIG_NET_LLH_LEN - The link level header length
-# CONFIG_NET_EXTERNAL_BUFFER - Incoming packet buffer (uip_buf) is defined externally
 # CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates
 CONFIG_NET=n
 CONFIG_NET_IPv6=n
@@ -287,7 +286,6 @@ CONFIG_NET_STATISTICS=y
 #CONFIG_NET_ARPTAB_SIZE=8
 CONFIG_NET_BROADCAST=n
 #CONFIG_NET_LLH_LEN=14
-CONFIG_NET_EXTERNAL_BUFFER=n
 #CONFIG_NET_FWCACHE_SIZE=2
 
 #
diff --git a/configs/m68332evb/defconfig b/configs/m68332evb/defconfig
index 0279e73bec6..4e6d2244134 100644
--- a/configs/m68332evb/defconfig
+++ b/configs/m68332evb/defconfig
@@ -257,7 +257,6 @@ CONFIG_PREALLOC_TIMERS=8
 # CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
 # CONFIG_NET_BROADCAST - Broadcast support
 # CONFIG_NET_LLH_LEN - The link level header length
-# CONFIG_NET_EXTERNAL_BUFFER - Incoming packet buffer (uip_buf) is defined externally
 # CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates
 CONFIG_NET=n
 CONFIG_NET_IPv6=n
@@ -276,7 +275,6 @@ CONFIG_NET_STATISTICS=y
 #CONFIG_NET_ARPTAB_SIZE=8
 CONFIG_NET_BROADCAST=n
 #CONFIG_NET_LLH_LEN=14
-CONFIG_NET_EXTERNAL_BUFFER=n
 #CONFIG_NET_FWCACHE_SIZE=2
 
 #
diff --git a/configs/mcu123-lpc214x/defconfig b/configs/mcu123-lpc214x/defconfig
index e594174f79b..e9ac4317fbc 100644
--- a/configs/mcu123-lpc214x/defconfig
+++ b/configs/mcu123-lpc214x/defconfig
@@ -281,7 +281,6 @@ CONFIG_PREALLOC_TIMERS=8
 # CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
 # CONFIG_NET_BROADCAST - Broadcast support
 # CONFIG_NET_LLH_LEN - The link level header length
-# CONFIG_NET_EXTERNAL_BUFFER - Incoming packet buffer (uip_buf) is defined externally
 # CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates
 CONFIG_NET=n
 CONFIG_NET_IPv6=n
@@ -300,7 +299,6 @@ CONFIG_NET_STATISTICS=y
 #CONFIG_NET_ARPTAB_SIZE=8
 CONFIG_NET_BROADCAST=n
 #CONFIG_NET_LLH_LEN=14
-CONFIG_NET_EXTERNAL_BUFFER=n
 #CONFIG_NET_FWCACHE_SIZE=2
 
 #
diff --git a/configs/ntosd-dm320/defconfig b/configs/ntosd-dm320/defconfig
index abbae5f5778..ae5ece04525 100644
--- a/configs/ntosd-dm320/defconfig
+++ b/configs/ntosd-dm320/defconfig
@@ -266,7 +266,6 @@ CONFIG_PREALLOC_TIMERS=8
 # CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
 # CONFIG_NET_BROADCAST - Broadcast support
 # CONFIG_NET_LLH_LEN - The link level header length
-# CONFIG_NET_EXTERNAL_BUFFER - Incoming packet buffer (uip_buf) is defined externally
 # CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates
 CONFIG_NET=n
 CONFIG_NET_IPv6=n
@@ -285,7 +284,6 @@ CONFIG_NET_STATISTICS=y
 #CONFIG_NET_ARPTAB_SIZE=8
 CONFIG_NET_BROADCAST=n
 #CONFIG_NET_LLH_LEN=14
-CONFIG_NET_EXTERNAL_BUFFER=n
 #CONFIG_NET_FWCACHE_SIZE=2
 
 #
diff --git a/configs/pjrc-8051/defconfig b/configs/pjrc-8051/defconfig
index 10024fd2b73..437972266e6 100644
--- a/configs/pjrc-8051/defconfig
+++ b/configs/pjrc-8051/defconfig
@@ -254,7 +254,6 @@ CONFIG_PREALLOC_TIMERS=0
 # CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
 # CONFIG_NET_BROADCAST - Broadcast support
 # CONFIG_NET_LLH_LEN - The link level header length
-# CONFIG_NET_EXTERNAL_BUFFER - Incoming packet buffer (uip_buf) is defined externally
 # CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates
 CONFIG_NET=n
 CONFIG_NET_IPv6=n
@@ -273,7 +272,6 @@ CONFIG_NET_STATISTICS=y
 #CONFIG_NET_ARPTAB_SIZE=8
 CONFIG_NET_BROADCAST=n
 #CONFIG_NET_LLH_LEN=14
-CONFIG_NET_EXTERNAL_BUFFER=n
 #CONFIG_NET_FWCACHE_SIZE=2
 
 #
diff --git a/configs/sim/defconfig b/configs/sim/defconfig
index fb5f60a1a85..fc62aa9e5dc 100644
--- a/configs/sim/defconfig
+++ b/configs/sim/defconfig
@@ -228,7 +228,6 @@ CONFIG_FS_FAT=y
 # CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
 # CONFIG_NET_BROADCAST - Broadcast support
 # CONFIG_NET_LLH_LEN - The link level header length
-# CONFIG_NET_EXTERNAL_BUFFER - Incoming packet buffer (uip_buf) is defined externally
 # CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates
 CONFIG_NET=n
 CONFIG_NET_IPv6=n
@@ -247,7 +246,6 @@ CONFIG_NET_STATISTICS=y
 #CONFIG_NET_ARPTAB_SIZE=8
 CONFIG_NET_BROADCAST=n
 #CONFIG_NET_LLH_LEN=14
-CONFIG_NET_EXTERNAL_BUFFER=n
 #CONFIG_NET_FWCACHE_SIZE=2
 
 #