diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ebfdf3c3b..8c9a5c9d29 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file based on the
 
 ### Breaking changes
 
+* Rename `network.total.bytes` to `network.bytes` and `network.total.packets`
+  to `network.packets`. #179
+* Remove `network.inbound.bytes`, `network.inbound.packets`,
+  `network.outbound.bytes` and `network.outbound.packets`. #179
+
 ### Bugfixes
 
 * Fix obvious mistake in the definition of "source", where it said "destination"
@@ -36,6 +41,8 @@ All notable changes to this project will be documented in this file based on the
 
 * Clarify the semantics of `network.direction`. #212
 
+* Add `source.bytes`, `source.packets`, `destination.bytes` and `destination.packets`. #179
+
 ### Deprecated
 
 ## [1.0.0-beta1](https://github.com/elastic/ecs/compare/v0.1.0...v1.0.0-beta1)
diff --git a/README.md b/README.md
index c8e1270ee2..097d567911 100644
--- a/README.md
+++ b/README.md
@@ -147,6 +147,8 @@ Destination fields describe details about the destination of a packet/event.
 | <a name="destination.port"></a>destination.port | Port of the destination. | core | long |  |
 | <a name="destination.mac"></a>destination.mac | MAC address of the destination. | core | keyword |  |
 | <a name="destination.domain"></a>destination.domain | Destination domain. | core | keyword |  |
+| <a name="destination.bytes"></a>destination.bytes | Bytes sent from the destination to the source. | core | long | `184` |
+| <a name="destination.packets"></a>destination.packets | Packets sent from the destination to the source. | core | long | `12` |
 
 
 ## <a name="device"></a> Device fields
@@ -322,12 +324,8 @@ The network is defined as the communication path over which a host or network ev
 | <a name="network.direction"></a>network.direction | Direction of the network traffic.<br/>Recommended values are:<br/>  * inbound<br/>  * outbound<br/>  * internal<br/>  * external<br/>  * unknown<br/><br/>When mapping events from a host-based monitoring context, populate this field from the host's point of view.<br/>When mapping events from a network or perimeter-based monitoring context, populate this field from the point of view of your network perimeter. | core | keyword | `inbound` |
 | <a name="network.forwarded_ip"></a>network.forwarded_ip | Host IP address when the source IP address is the proxy. | core | ip | `192.1.1.2` |
 | <a name="network.community_id"></a>network.community_id | A hash of source and destination IPs and ports, as well as the protocol used in a communication. This is a tool-agnostic standard to identify flows.<br/>Learn more at https://github.com/corelight/community-id-spec. | extended | keyword | `1:hO+sN4H+MG5MY/8hIrXPqc4ZQz0=` |
-| <a name="network.inbound.bytes"></a>network.inbound.bytes | Network inbound bytes. | core | long | `184` |
-| <a name="network.inbound.packets"></a>network.inbound.packets | Network inbound packets. | core | long | `12` |
-| <a name="network.outbound.bytes"></a>network.outbound.bytes | Network outbound bytes. | core | long | `184` |
-| <a name="network.outbound.packets"></a>network.outbound.packets | Network outbound packets. | core | long | `12` |
-| <a name="network.total.bytes"></a>network.total.bytes | Network total bytes. The sum of inbound.bytes + outbound.bytes. | core | long | `368` |
-| <a name="network.total.packets"></a>network.total.packets | Network outbound packets. The sum of inbound.packets + outbound.packets | core | long | `24` |
+| <a name="network.bytes"></a>network.bytes | Total bytes transferred in both directions.<br/>If `source.bytes` and `destination.bytes` are known, `network.bytes` is their sum. | core | long | `368` |
+| <a name="network.packets"></a>network.packets | Total packets transferred in both directions.<br/>If `source.packets` and `destination.packets` are known, `network.packets` is their sum. | core | long | `24` |
 
 
 ## <a name="organization"></a> Organization fields
@@ -415,6 +413,8 @@ Source fields describe details about the source of a packet/event.
 | <a name="source.port"></a>source.port | Port of the source. | core | long |  |
 | <a name="source.mac"></a>source.mac | MAC address of the source. | core | keyword |  |
 | <a name="source.domain"></a>source.domain | Source domain. | core | keyword |  |
+| <a name="source.bytes"></a>source.bytes | Bytes sent from the source to the destination. | core | long | `184` |
+| <a name="source.packets"></a>source.packets | Packets sent from the source to the destination. | core | long | `12` |
 
 
 ## <a name="url"></a> URL fields
diff --git a/fields.yml b/fields.yml
index 8df5459473..87704127c9 100644
--- a/fields.yml
+++ b/fields.yml
@@ -269,6 +269,21 @@
           description: >
             Destination domain.
     
+        # Metrics
+        - name: bytes
+          level: core
+          type: long
+          example: 184
+          description: >
+            Bytes sent from the destination to the source.
+    
+        - name: packets
+          level: core
+          type: long
+          example: 12
+          description: >
+            Packets sent from the destination to the source.
+    
     - name: device
       title: Device
       group: 2
@@ -933,46 +948,22 @@
           example: '1:hO+sN4H+MG5MY/8hIrXPqc4ZQz0='
     
         # Metrics
-        - name: inbound.bytes
-          level: core
-          type: long
-          description: >
-            Network inbound bytes.
-          example: 184
-    
-        - name: inbound.packets
-          level: core
-          type: long
-          description: >
-            Network inbound packets.
-          example: 12
-    
-        - name: outbound.bytes
+        - name: bytes
           level: core
           type: long
           description: >
-            Network outbound bytes.
-          example: 184
-    
-        - name: outbound.packets
-          level: core
-          type: long
-          description: >
-            Network outbound packets.
-          example: 12
+            Total bytes transferred in both directions.
     
-        - name: total.bytes
-          level: core
-          type: long
-          description: >
-            Network total bytes. The sum of inbound.bytes + outbound.bytes.
+            If `source.bytes` and `destination.bytes` are known, `network.bytes` is their sum.
           example: 368
     
-        - name: total.packets
+        - name: packets
           level: core
           type: long
           description: >
-            Network outbound packets. The sum of inbound.packets + outbound.packets
+            Total packets transferred in both directions.
+    
+            If `source.packets` and `destination.packets` are known, `network.packets` is their sum.
           example: 24
     
     - name: organization
@@ -1261,6 +1252,21 @@
           description: >
             Source domain.
     
+        # Metrics
+        - name: bytes
+          level: core
+          type: long
+          example: 184
+          description: >
+            Bytes sent from the source to the destination.
+    
+        - name: packets
+          level: core
+          type: long
+          example: 12
+          description: >
+            Packets sent from the source to the destination.
+    
     - name: url
       title: URL
       description: >
diff --git a/schema.csv b/schema.csv
index 0dbf56413e..eeab67f1a5 100644
--- a/schema.csv
+++ b/schema.csv
@@ -21,9 +21,11 @@ container.image.tag,keyword,extended,
 container.labels,object,extended,
 container.name,keyword,extended,
 container.runtime,keyword,extended,docker
+destination.bytes,long,core,184
 destination.domain,keyword,core,
 destination.ip,ip,core,
 destination.mac,keyword,core,
+destination.packets,long,core,12
 destination.port,long,core,
 device.hostname,keyword,core,
 device.ip,ip,core,
@@ -89,18 +91,14 @@ http.version,keyword,extended,1.1
 log.level,keyword,core,ERR
 log.original,keyword,core,Sep 19 08:26:10 localhost My log
 network.application,keyword,extended,AIM
+network.bytes,long,core,368
 network.community_id,keyword,extended,1:hO+sN4H+MG5MY/8hIrXPqc4ZQz0=
 network.direction,keyword,core,inbound
 network.forwarded_ip,ip,core,192.1.1.2
 network.iana_number,keyword,extended,6
-network.inbound.bytes,long,core,184
-network.inbound.packets,long,core,12
 network.name,keyword,extended,Guest Wifi
-network.outbound.bytes,long,core,184
-network.outbound.packets,long,core,12
+network.packets,long,core,24
 network.protocol,keyword,core,http
-network.total.bytes,long,core,368
-network.total.packets,long,core,24
 network.transport,keyword,core,TCP
 network.type,keyword,core,IPv4
 organization.id,keyword,extended,
@@ -126,9 +124,11 @@ service.name,keyword,core,elasticsearch-metrics
 service.state,keyword,core,
 service.type,keyword,core,elasticsearch
 service.version,keyword,core,3.2.4
+source.bytes,long,core,184
 source.domain,keyword,core,
 source.ip,ip,core,
 source.mac,keyword,core,
+source.packets,long,core,12
 source.port,long,core,
 url.domain,keyword,extended,www.elastic.co
 url.fragment,keyword,extended,
diff --git a/schemas/destination.yml b/schemas/destination.yml
index cde74dc6c3..e9f5ed2049 100644
--- a/schemas/destination.yml
+++ b/schemas/destination.yml
@@ -33,3 +33,18 @@
       type: keyword
       description: >
         Destination domain.
+
+    # Metrics
+    - name: bytes
+      level: core
+      type: long
+      example: 184
+      description: >
+        Bytes sent from the destination to the source.
+
+    - name: packets
+      level: core
+      type: long
+      example: 12
+      description: >
+        Packets sent from the destination to the source.
diff --git a/schemas/network.yml b/schemas/network.yml
index 51e4c1f8f2..ee38ee973e 100644
--- a/schemas/network.yml
+++ b/schemas/network.yml
@@ -95,44 +95,20 @@
       example: '1:hO+sN4H+MG5MY/8hIrXPqc4ZQz0='
 
     # Metrics
-    - name: inbound.bytes
+    - name: bytes
       level: core
       type: long
       description: >
-        Network inbound bytes.
-      example: 184
+        Total bytes transferred in both directions.
 
-    - name: inbound.packets
-      level: core
-      type: long
-      description: >
-        Network inbound packets.
-      example: 12
-
-    - name: outbound.bytes
-      level: core
-      type: long
-      description: >
-        Network outbound bytes.
-      example: 184
-
-    - name: outbound.packets
-      level: core
-      type: long
-      description: >
-        Network outbound packets.
-      example: 12
-
-    - name: total.bytes
-      level: core
-      type: long
-      description: >
-        Network total bytes. The sum of inbound.bytes + outbound.bytes.
+        If `source.bytes` and `destination.bytes` are known, `network.bytes` is their sum.
       example: 368
 
-    - name: total.packets
+    - name: packets
       level: core
       type: long
       description: >
-        Network outbound packets. The sum of inbound.packets + outbound.packets
+        Total packets transferred in both directions.
+
+        If `source.packets` and `destination.packets` are known, `network.packets` is their sum.
       example: 24
diff --git a/schemas/source.yml b/schemas/source.yml
index 068ff7fd4a..098df51ddc 100644
--- a/schemas/source.yml
+++ b/schemas/source.yml
@@ -33,3 +33,18 @@
       type: keyword
       description: >
         Source domain.
+
+    # Metrics
+    - name: bytes
+      level: core
+      type: long
+      example: 184
+      description: >
+        Bytes sent from the source to the destination.
+
+    - name: packets
+      level: core
+      type: long
+      example: 12
+      description: >
+        Packets sent from the source to the destination.
diff --git a/template.json b/template.json
index ed0bef8337..0032368193 100644
--- a/template.json
+++ b/template.json
@@ -124,6 +124,9 @@
         },
         "destination": {
           "properties": {
+            "bytes": {
+              "type": "long"
+            },
             "domain": {
               "ignore_above": 1024,
               "type": "keyword"
@@ -135,6 +138,9 @@
               "ignore_above": 1024,
               "type": "keyword"
             },
+            "packets": {
+              "type": "long"
+            },
             "port": {
               "type": "long"
             }
@@ -443,6 +449,9 @@
               "ignore_above": 1024,
               "type": "keyword"
             },
+            "bytes": {
+              "type": "long"
+            },
             "community_id": {
               "ignore_above": 1024,
               "type": "keyword"
@@ -458,44 +467,17 @@
               "ignore_above": 1024,
               "type": "keyword"
             },
-            "inbound": {
-              "properties": {
-                "bytes": {
-                  "type": "long"
-                },
-                "packets": {
-                  "type": "long"
-                }
-              }
-            },
             "name": {
               "ignore_above": 1024,
               "type": "keyword"
             },
-            "outbound": {
-              "properties": {
-                "bytes": {
-                  "type": "long"
-                },
-                "packets": {
-                  "type": "long"
-                }
-              }
+            "packets": {
+              "type": "long"
             },
             "protocol": {
               "ignore_above": 1024,
               "type": "keyword"
             },
-            "total": {
-              "properties": {
-                "bytes": {
-                  "type": "long"
-                },
-                "packets": {
-                  "type": "long"
-                }
-              }
-            },
             "transport": {
               "ignore_above": 1024,
               "type": "keyword"
@@ -619,6 +601,9 @@
         },
         "source": {
           "properties": {
+            "bytes": {
+              "type": "long"
+            },
             "domain": {
               "ignore_above": 1024,
               "type": "keyword"
@@ -630,6 +615,9 @@
               "ignore_above": 1024,
               "type": "keyword"
             },
+            "packets": {
+              "type": "long"
+            },
             "port": {
               "type": "long"
             }