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dvdksn merged 1 commit into from
Jul 23, 2026
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Document DSR overlay networks #25613

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1 change: 1 addition & 0 deletions content/manuals/engine/network/drivers/overlay.md
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Expand Up @@ -7,6 +7,7 @@ aliases:
- /engine/userguide/networking/overlay-security-model/
- /network/overlay/
- /network/drivers/overlay/
- /network/network-tutorial-overlay/
- /engine/network/tutorials/overlay/
- /engine/userguide/networking/get-started-overlay/
---
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20 changes: 20 additions & 0 deletions content/manuals/engine/swarm/networking.md
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Expand Up @@ -243,6 +243,26 @@ If you need more than 256 IP addresses, do not increase the IP block size. You c
endpoint mode with an external load balancer, or use multiple smaller overlay networks. See
[Configure service discovery](#configure-service-discovery) for more information about different endpoint modes.

#### Use direct server return

Direct server return (DSR) changes east-west overlay load balancing so that
IPVS routes packets by changing the destination MAC address. The source IP and
destination virtual IP (VIP) remain unchanged.

Create an overlay network that uses DSR:

```console
$ docker network create \
--driver overlay \
--opt dsr \
dsr-net
```

> [!NOTE]
>
> DSR is supported only for traffic between services on Linux nodes. The
> ingress routing mesh does not use DSR.

#### Configure encryption of application data {#encryption}

Management and control plane data related to a swarm is always encrypted.
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