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-+++
-title = "Networking"
-weight = 50
-+++
-gVisor implements its own network stack called [netstack][netstack]. All aspects
-of the network stack are handled inside the Sentry — including TCP connection
-state, control messages, and packet assembly — keeping it isolated from the host
-network stack. Data link layer packets are written directly to the virtual
-device inside the network namespace setup by Docker or Kubernetes.
-
-The IP address and routes configured for the device are transferred inside the
-sandbox. The loopback device runs exclusively inside the sandbox and does not
-use the host. You can inspect them by running:
-
-```bash
-docker run --rm --runtime=runsc alpine ip addr
-```
-
-## Network passthrough
-
-For high-performance networking applications, you may choose to disable the user
-space network stack and instead use the host network stack, including the loopback.
-Note that this mode decreases the isolation to the host.
-
-Add the following `runtimeArgs` to your Docker configuration
-(`/etc/docker/daemon.json`) and restart the Docker daemon:
-
-```json
-{
-    "runtimes": {
-        "runsc": {
-            "path": "/usr/local/bin/runsc",
-            "runtimeArgs": [
-                "--network=host"
-            ]
-       }
-    }
-}
-```
-
-## Disabling external networking
-
-To completely isolate the host and network from the sandbox, external
-networking can be disabled. The sandbox will still contain a loopback provided
-by netstack.
-
-Add the following `runtimeArgs` to your Docker configuration
-(`/etc/docker/daemon.json`) and restart the Docker daemon:
-
-```json
-{
-    "runtimes": {
-        "runsc": {
-            "path": "/usr/local/bin/runsc",
-            "runtimeArgs": [
-                "--network=none"
-            ]
-       }
-    }
-}
-```
-
-### Disable GSO {#gso}
-
-If your Linux is older than {{< required_linux >}}, you can disable Generic
-Segmentation Offload (GSO) to run with a kernel that is newer than 3.17. Add the
-`--gso=false` flag to your Docker runtime configuration (`/etc/docker/daemon.json`)
-and restart the Docker daemon:
-
-> Note: Network performance, especially for large payloads, will be greatly reduced.
-
-```json
-{
-    "runtimes": {
-        "runsc": {
-            "path": "/usr/local/bin/runsc",
-            "runtimeArgs": [
-                "--gso=false"
-            ]
-       }
-    }
-}
-```
-
-[netstack]: https://github.com/google/netstack