> ## Documentation Index
> Fetch the complete documentation index at: https://clickhouse.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# network_* session settings

> ClickHouse session settings in the network_* generated group.

export const SettingsInfoBlock = ({type, default_value, changeable_without_restart}) => {
  return <div className="not-prose" style={{
    display: "flex",
    flexWrap: "wrap",
    alignItems: "baseline",
    columnGap: "0.5rem",
    rowGap: "0.125rem",
    margin: "0.375rem 0",
    fontSize: "0.8125rem",
    lineHeight: "1.125rem"
  }}>
      <div style={{
    fontWeight: 600,
    opacity: 0.72
  }}>Type</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>Default</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          Changeable without restart
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

These settings are available in [system.settings](/docs/reference/system-tables/settings) and are autogenerated from [source](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp).

<h2 id="network_compression_method">
  network\_compression\_method
</h2>

<SettingsInfoBlock type="String" default_value="LZ4" />

The codec for compressing the client/server and server/server communication.

Possible values:

* `NONE` — no compression.
* `LZ4` — use the LZ4 codec.
* `LZ4HC` — use the LZ4HC codec.
* `ZSTD` — use the ZSTD codec.

**See Also**

* [network\_zstd\_compression\_level](/docs/reference/settings/session-settings/network#network_zstd_compression_level)

<h2 id="network_zstd_compression_level">
  network\_zstd\_compression\_level
</h2>

<SettingsInfoBlock type="Int64" default_value="1" />

Adjusts the level of ZSTD compression. Used only when [network\_compression\_method](/docs/reference/settings/session-settings/network#network_compression_method) is set to `ZSTD`.

Possible values:

* Positive integer from 1 to 15.