---
title: PtP bridge-specific configuration (P621, P423, and P421)
description: When included in a bridge kit, the AltoPlex PtP radios (P621, P421, and P423) are preconfigured to automatically connect to each other when installed. No further configuration is.
---

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# PtP bridge-specific configuration (P621, P423, and P421)

When included in a bridge kit (P621, P421, and P423), AltoPlex radios are preconfigured to automatically connect to each other when installed. No further configuration is required. Additional configuration, such as setting the radio's description and location, as well as specific networking configuration for your location, can be performed. See [Configuration via the WebUI](https://support.altowav.com/network-tab.html?hsLang=en-us).

If you factory reset one of the radios in a bridged pair, the bridge between the radios will no longer work. Follow the instructions for [Configure a replacement radio,](https://support.altowav.com/p621-bridge-specific-configuration-p621.html?hsLang=en-us) below, to reconfigure the devices to form a bridged connection.

#### Configure a replacement radio

If your radio is a replacement unit, after you replace the defective radio, the steps required to establish a link to the existing radio vary depending on which radio in the link is being replaced.

These steps also apply when a radio in a bridged pair has been factory reset, in which case it will behave like a replacement radio.

![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/PtP-nodes-identified_50f4ad47.png?width=420&height=327&name=PtP-nodes-identified_50f4ad47.png)

If the radio being replaced is the network-attached device (node A in the above diagram):

1. Connect to the remote radio (node B) by using its [diagnostic Wi-Fi access point](https://support.altowav.com/how-to-connect-via-the-wi-fi-management-ap-d423.html?hsLang=en-us) or a wired connection.
   
   If the radio cannot be accessed by either Wi-Fi or a wired connection, physical access to the radio to perform a hard factory reset is required.
2. Remove the existing link to the defective radio and reboot node B.
3. On the replacement radio (node A), use the DN link auto-configuration feature to establish a link to the existing remote radio (node B).

See the following procedures, below, for instructions.

If the radio being replaced is the remote device (Node B in the above diagram):

- On the existing radio (Node A), remove the link to the defective radio and use the DN link auto-configuration feature to establish a new link. See the following procedures, below, for instructions.

#### Remove link to previous radio

When included in a bridge kit, the PtP radios are preconfigured to automatically connect to each other when installed. This procedure is for a replacement unit only.

If your radio is a replacement unit, and the radio being replaced is the network-attached device (node A in the above diagram), you must be able to access the remote device (node B). To connect to the remote device, you must have wired or Wi-Fi access to the radio. If you cannot access the radio by using Wi-Fi or a wired connection, physical access to the radio is required to perform a hard factory reset.

1. Access the WebUI of the radio. In your browser's address bar, type:
   
   **https://*hostname***
   
   where *hostname* is the hostname (KB-XX-XX-XX) or IP address of the radio. See [Connecting to the AltoPlex radio](https://support.altowav.com/connect-to-the-altoreach-device.html#h3) for more information.
2. Click the **login** link in the WebUI header to log in as administrator. The default password is **admin**.
   
   ![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/WebUI-login-link-with-wireless-tab_b61c241c.png?width=670&height=99&name=WebUI-login-link-with-wireless-tab_b61c241c.png)
3. Click the **Wireless** tab.
4. Delete the MAC address of the defective radio from the **Radio 0 DN responder** field.
5. Click **Submit Changes**.
   
   ![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/radio-0-DN-responder_P621_23c3f40e.png?width=465&height=345&name=radio-0-DN-responder_P621_23c3f40e.png)
6. If this procedure is being performed: 
     - On the network-attached radio (Node A in the above diagram), proceed to step 4 in the [DN link auto-configuration](https://support.altowav.com/p621-bridge-specific-configuration-p621.html?hsLang=en-us) section, below.
     - On the remote radio (Node B in the above diagram): 
           1. Click the **Admin** tab.
           2. Click **Reboot Unit**.
              
              ![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/WebUI-D621-Admin-tab_reboot-unit_927911d2.png?width=521&height=179&name=WebUI-D621-Admin-tab_reboot-unit_927911d2.png)
           3. Proceed to the [DN link auto-configuration](https://support.altowav.com/p621-bridge-specific-configuration#h1) section, below.

#### DN link auto-configuration

1. Access the WebUI of the radio. In your browser's address bar, type:
   
   **https://*hostname***
   
   where *hostname* is the hostname (KB-XX-XX-XX) or IP address of the radio. See [Connecting to the AltoPlex radio](https://support.altowav.com/connect-to-the-altoreach-device.html#h3) for more information.
2. Click the **login** link in the WebUI header to log in as administrator. The default password is **admin**.
   
   ![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/WebUI-login-link-with-wireless-tab_b61c241c.png?width=670&height=99&name=WebUI-login-link-with-wireless-tab_b61c241c.png)
3. Click the **Wireless** tab.
4. In the **DN link auto-configuration** section, type the MAC address of the **DN responder**.
5. Click **Add**.
   
   ![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/radio-0-DN-responder_P621_1_8a4cac34.png?width=468&height=347&name=radio-0-DN-responder_P621_1_8a4cac34.png)

After the connection between the devices has been initialized, perform additional configuration as necessary. See [Configuration via the WebUI](https://support.altowav.com/network-tab.html?hsLang=en-us).

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