> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/tmedia-documentation/configuration/web-portal-3-3/system/services/set-dns.md).

# Configuring the DNS

> **Applies to:** Tmedia 3.0, 3.2, 3.3; SBC 3.1, 3.3

1-Click **Services** in the navigation panel.

![Snmp cfg A 0](https://docs.telcobridges.com/w/images/c/c5/Snmp_cfg_A_0.png)

2- DNS can be managed by an administrator on the Linux host. You can use the [tbchangeip](/tmedia-documentation/operations-and-support/troubleshooting/software/troubleshooting-toolpack/change-management-ip-address.md) command to do this. DNS services can also be managed by the Web portal. To do so, select **Managed by Web**.

3- Add the DNS servers IP addresses in the **Name Server** box and add them to the list using the left double arrow **<<**.

4- You can do the same with **Domain names**

![DNS Services main](https://docs.telcobridges.com/w/images/b/b1/DNS_Services_main.png)

### List of Parameters

* [Managed by Web](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/other#m)

**Advanced Parameters**

* [IP Header Type of Service (ToS)](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/packet-network-type-of-service)


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