Q: how do i setup using ipv4 on a time capsule

Hello worminacan,

Thank you for using Apple Support Communities. 

I understand that you would like to connect to your Mac and AirPort Time Capsule from a remote location. I know how important it is to make sure that you can access your network remotely when needed. I have something that I would like you to try. 

You can accomplish this with a feature called Back to My Mac. Back to My Mac is an iCloud feature that lets you set up a network of Mac computers that you can access remotely. Use Set up and use Back to My Mac, specifically, these sections: 

What you need

To set up and use Back to My Mac, you need these things:

• Two or more Mac computers that are using the same iCloud account on OS X Lion v10.7.5 or later. 
• An AirPort base station (AirPort Extreme, AirPort Express, or AirPort Time Capsule) or other Internet router that supports UPnP or NAT-PMP, with the latest available firmware. AirPort base stations require firmware version 7.6.1 or later for Back to My Mac.
• AirPort Utility 6.3 or later.
• For screen sharing, a 300-Kbps-or-faster, bi-directional (up/down) Internet connection between computers. You might be able to use file sharing with slower connections. If file sharing isn't working like you expect, check your settings and connections.
• A firewall that allows remote connections. Some firewalls might prevent certain Back to My Mac connections. For example, when you're at home, you might not be able to connect to your Mac at work. But when you're at work, you might be able to connect to your Mac at home. If you aren't sure if the firewall will allow Back to My Mac connections, check with your organization's network administrator.  

If you want to use an AirPort Extreme or AirPort Time Capsule to access files on an external hard drive, you need a Mac OS Extended (Journaled) formatted USB hard drive. When you use it with Back to My Mac, your hard drive will appear as the base station under Shared in the Finder sidebar.

Set up Back to My Mac

To get started, you need to set up Back to My Mac on each Mac that you want to use: 

1. Choose System Preferences from the Apple () menu, and click iCloud.
2. If you aren't already signed in to iCloud, enter the Apple ID you use with iCloud and click Sign In.
3. Select Back to My Mac.
4. Follow any setup instructions that you see next to Back to My Mac.
5. Set up security options.

If you want to access files on a hard drive connected to an AirPort Extreme or AirPort Time Capsule, follow these steps to set up Back to My Mac on your base station:

1. Make sure you're on the same local area network (LAN) as the AirPort base station that you want to set up.
2. From the menu bar, choose Go > Utilities and double-click AirPort Utility.
3. Select the AirPort base station that you want to use with Back to My Mac, and click Edit. If you don't see the base station, click Other Wi-Fi Devices to see a list of available base stations. You might need to choose a different Network Interface from the pop-up menu.
4. Enter the base station password. This password is different from your iCloud password.
5. Select the Base Station tab.
6. In the Back to my Mac section, click the + button and enter the Apple ID and password you use with Back to My Mac. You should see a green status indicator showing that Back to My Mac is turned on.
7. Click Update to save your changes.

Connect to a remote Mac or AirPort base station in your Back to My Mac network

After you set up each Mac or AirPort base station, you can connect to it remotely:

1. From the Finder menu, choose Preferences, and click the Sidebar tab.
2. In the Shared section, select Back to My Mac. 
3. Open a Finder window, and look for the Shared section in the sidebar. If you don’t see any shared computers or base stations, place the pointer over the word Shared and click Show.
4. Select the remote computer or base station that you want to access and click Connect As. (To share a screen with your remote Mac, select the Mac and click Share Screen.) If you don't see the Mac or base station that you're looking for, click All to see a list of available Mac computers and base stations.

Have a great day!