Mac OS X doesn’t remount network drives when booted. You have to do this yourselves.

You can easily automate this by creating an application using the automator and add it to your login items.

You automator script should contain two items:

• Get Specified Servers
• Connect to Servers

Save the script as an application and put it into login items for your user account. This will execute your small application each time you login and you should be reconnected to your NAS on startup.