diff --git a/Makefile b/Makefile
index 1772cc9..5cb31c5 100644
--- a/Makefile
+++ b/Makefile
@@ -13,11 +13,17 @@ MAKE = make --no-print-directory
 
 
 $(BCOMPOSE): templates/compose.yaml.j2 scripts/jinja/customize.py $(BCONFIG)
-	@echo Building $(BCOMPOSE) from jinja template
+	@if [ $(BCONFIG) -ot default-config.yaml ]; then \
+		echo "Warning: default-config.yaml has been updated recently, consider updating $(BCONFIG)"; \
+	fi
+	@echo Building $(BCOMPOSE) from jinja template.
 	@mkdir -p $$(dirname $(BCOMPOSE))
 	@j2 --customize scripts/jinja/customize.py -o $(BCOMPOSE) templates/compose.yaml.j2 $(BCONFIG)
 
-$(BCONFIG): default-config.yaml
+$(BCONFIG):
+	# Note: "default-config.yaml" is not a dependency of this target
+	# to avoid overriding local config.
+	# You may want to do a "make clean" when updating the template.
 	@echo Copying default-config.yaml into $(BCONFIG)
 	@mkdir -p $$(dirname $(BCONFIG))
 	@cp default-config.yaml $(BCONFIG)
diff --git a/default-config.yaml b/default-config.yaml
index 44d9290..f52dd8c 100644
--- a/default-config.yaml
+++ b/default-config.yaml
@@ -222,69 +222,69 @@ subnets:
       ipv4_address: 10.4.0.2
   slice0:
     subnet:
-      ipv4_address: 10.2.0.0/24
+      ipv4_prefix: 10.2.0.0/24
   slice0-static:
     subnet:
-      ipv4_address: 10.2.0.128/25
+      ipv4_prefix: 10.2.0.128/25
   slice1:
     subnet:
-      ipv4_address: 10.2.1.0/24
+      ipv4_prefix: 10.2.1.0/24
   slice1-e1:
     subnet:
-      ipv4_address: 10.2.1.0/26
+      ipv4_prefix: 10.2.1.0/26
   slice1-e1-static:
     subnet:
-      ipv4_address: 10.2.1.64/26
+      ipv4_prefix: 10.2.1.64/26
   slice1-e2:
     subnet:
-      ipv4_address: 10.2.1.128/26
+      ipv4_prefix: 10.2.1.128/26
   slice1-e2-static:
     subnet:
-      ipv4_address: 10.2.1.192/26
+      ipv4_prefix: 10.2.1.192/26
   slice2:
     subnet:
-      ipv4_address: 10.2.2.0/24
+      ipv4_prefix: 10.2.2.0/24
   slice2-e1:
     subnet:
-      ipv4_address: 10.2.2.0/26
+      ipv4_prefix: 10.2.2.0/26
   slice2-e1-static:
     subnet:
-      ipv4_address: 10.2.2.64/26
+      ipv4_prefix: 10.2.2.64/26
   slice2-e2:
     subnet:
-      ipv4_address: 10.2.2.128/26
+      ipv4_prefix: 10.2.2.128/26
   slice2-e2-static:
     subnet:
-      ipv4_address: 10.2.2.192/26
+      ipv4_prefix: 10.2.2.192/26
   srgw0:
     subnet:
-      ipv6_address: fc00:1::/32
+      ipv6_prefix: fc00:1::/32
     srgw0:
       ipv4_address: 10.3.0.1
     end-m-gtp4-e:
       ipv6_prefix: fc00:1:1::/48
   srgw1:
     subnet:
-      ipv6_address: fc00:4::/32
+      ipv6_prefix: fc00:4::/32
     srgw1:
       ipv4_address: 10.3.0.2
     end-m-gtp4-e:
       ipv6_prefix: fc00:4:1::/48
   r0:
     subnet:
-      ipv6_address: fc00:2::/32
+      ipv6_prefix: fc00:2::/32
     end-dx4:
       ipv6_address: "fc00:2:1::"
       ipv6_prefix: fc00:2:1::/48
   r1:
     subnet:
-      ipv6_address: fc00:3::/32
+      ipv6_prefix: fc00:3::/32
     end-dx4:
       ipv6_address: "fc00:3:1::"
       ipv6_prefix: fc00:3:1::/48
   r2:
     subnet:
-      ipv6_address: fc00:5::/32
+      ipv6_prefix: fc00:5::/32
     end-dx4:
       ipv6_address: "fc00:5:1::"
       ipv6_prefix: fc00:5:1::/48
diff --git a/scripts/jinja/customize.py b/scripts/jinja/customize.py
index 2b4b0e4..932e383 100644
--- a/scripts/jinja/customize.py
+++ b/scripts/jinja/customize.py
@@ -412,18 +412,28 @@ def ipv6(host: str, subnet: str, _context: _Context) -> str:
 def ipv4_subnet(subnet: str, _context: _Context) -> str:
     '''Get IPv4 subnet'''
     try:
-        addr = _context.dict['subnets'][subnet]['subnet']['ipv4_address']
+        addr = _context.dict['subnets'][subnet]['subnet']['ipv4_prefix']
     except KeyError as exc:
-        raise(TemplateError(f'Unknown ipv4 subnet: {subnet}')) from exc
+        # XXX: remove this backward compatibility fallback after some time
+        try:
+            addr = _context.dict['subnets'][subnet]['subnet']['ipv4_address']
+            print('warning: subnets[].subnet.ipv4_address is deprecated and must be replaced by subnets[].subnet.ipv4_prefix')
+        except KeyError as exc:
+            raise(TemplateError(f'Unknown ipv4 subnet: {subnet}')) from exc
     return addr
 
 @j2_function
 def ipv6_subnet(subnet: str, _context: _Context) -> str:
     '''Get IPv6 subnet'''
     try:
-        addr = _context.dict['subnets'][subnet]['subnet']['ipv6_address']
+        addr = _context.dict['subnets'][subnet]['subnet']['ipv6_prefix']
     except KeyError as exc:
-        raise(TemplateError(f'Unknown ipv6 subnet: {subnet}')) from exc
+        # XXX: remove this backward compatibility fallback after some time
+        try:
+            addr = _context.dict['subnets'][subnet]['subnet']['ipv6_address']
+            print('warning: subnets[].subnet.ipv6_address is deprecated and must be replaced by subnets[].subnet.ipv6_prefix')
+        except KeyError as exc:
+            raise(TemplateError(f'Unknown ipv6 subnet: {subnet}')) from exc
     return addr
 
 @j2_function