diff --git a/build/cbridge.conf b/build/cbridge.conf
new file mode 100644
index 00000000..35b78810
--- /dev/null
+++ b/build/cbridge.conf
@@ -0,0 +1,4 @@
+chaddr 177001
+chudp 44041
+ncp enabled yes
+link chudp localhost:44042 host 177002 myaddr 177001
diff --git a/build/klh10/start b/build/klh10/start
index 2e1915ab..da674f33 100755
--- a/build/klh10/start
+++ b/build/klh10/start
@@ -21,11 +21,17 @@ stop() {
     echo "OK"
 }
 
+chaosnet() {
+    (sleep 2; tools/cbridge/cbridge -c build/cbridge.conf >cbridge.log 2>&1) &
+    started "Chaosnet bridge" "$!"
+}
+
 help() {
     cat <<EOF
 This start script takes several command line arguments:
 
 help - Display this help text.
+chaosnet - Start a local Chaosnet.
 
 EOF
 
diff --git a/build/pdp10-ka/start b/build/pdp10-ka/start
index 6d4ae4df..a3f1f1c4 100755
--- a/build/pdp10-ka/start
+++ b/build/pdp10-ka/start
@@ -73,6 +73,11 @@ simh_imlac() {
     started "Imlac" "$!"
 }
 
+chaosnet() {
+    (sleep 2; tools/cbridge/cbridge -c build/cbridge.conf >cbridge.log 2>&1) &
+    started "Chaosnet bridge" "$!"
+}
+
 help() {
     cat <<EOF
 This start script takes several command line arguments:
@@ -88,6 +93,7 @@ datapoint - Start a Datapoint 3300 emulator.
 vt52 - Start a VT52 emulator.
 tek - Start a Tektronix 4010 emulator.
 cscope - Enable the color scope.
+chaosnet - Start a local Chaosnet.
 
 EOF
 
diff --git a/build/pdp10-kl/start b/build/pdp10-kl/start
index d922e92b..edac8fab 100755
--- a/build/pdp10-kl/start
+++ b/build/pdp10-kl/start
@@ -31,6 +31,11 @@ tek() {
     started "Tektronix" "$!"
 }
 
+chaosnet() {
+    (sleep 2; tools/cbridge/cbridge -c build/cbridge.conf >cbridge.log 2>&1) &
+    started "Chaosnet bridge" "$!"
+}
+
 help() {
     cat <<EOF
 This start script takes several command line arguments:
@@ -38,6 +43,7 @@ This start script takes several command line arguments:
 help - Display this help text.
 vt52 - Start a VT52 emulator.
 tek - Start a Tektronix 4010 emulator.
+chaosnet - Start a local Chaosnet.
 
 EOF
 
diff --git a/build/pdp10-ks/start b/build/pdp10-ks/start
index bfc0872b..2c9998ad 100755
--- a/build/pdp10-ks/start
+++ b/build/pdp10-ks/start
@@ -30,6 +30,11 @@ vt52() {
     started "VT52" "$!"
 }
 
+chaosnet() {
+    (sleep 2; tools/cbridge/cbridge -c build/cbridge.conf >cbridge.log 2>&1) &
+    started "Chaosnet bridge" "$!"
+}
+
 help() {
     cat <<EOF
 This start script takes several command line arguments:
@@ -37,6 +42,7 @@ This start script takes several command line arguments:
 help - Display this help text.
 gt40 - Start a GT40 emulator.
 vt52 - Start a VT52 emulator.
+chaosnet - Start a local Chaosnet.
 
 EOF
 
diff --git a/build/simh/start b/build/simh/start
index 92b435bd..8b994f9b 100755
--- a/build/simh/start
+++ b/build/simh/start
@@ -30,6 +30,11 @@ vt52() {
     started "VT52" "$!"
 }
 
+chaosnet() {
+    (sleep 2; tools/cbridge/cbridge -c build/cbridge.conf >cbridge.log 2>&1) &
+    started "Chaosnet bridge" "$!"
+}
+
 help() {
     cat <<EOF
 This start script takes several command line arguments:
@@ -37,6 +42,7 @@ This start script takes several command line arguments:
 help - Display this help text.
 gt40 - Start a GT40 emulator.
 vt52 - Start a VT52 emulator.
+chaosnet - Start a local Chaosnet.
 
 EOF