yes:
you must edit your preferences.plist located in:
/private/var/preferences/SystemConfiguration
Code:
<key>Interface</key>
<dict>
<key>DeviceName</key>
<string>ip1</string>
<key>Hardware</key>
<string>com.apple.CommCenter</string>
<key>Type</key>
<string>com.apple.CommCenter</string>
<key>UserDefinedName</key>
<string>com.apple.CommCenter (ip1)</string>
</dict>
<key>Proxies</key>
<dict>
<key>HTTPEnable</key>
<integer>1</integer>
<key>HTTPPort</key>
<integer>80</integer>
<key>HTTPProxy</key>
<string>172.25.0.107</string>
<key>HTTPSEnable</key>
<integer>1</integer>
<key>HTTPSPort</key>
<integer>80</integer>
<key>HTTPSProxy</key>
<string>172.25.0.107</string>
</dict>
<key>UserDefinedName</key>
<string>com.apple.CommCenter (ip1)</string>
<key>com.apple.CommCenter</key>
<dict>
<key>AllowNetworkAccess</key>
<integer>1</integer>
<key>Available</key>
<integer>1</integer>
<key>Setup</key>
<dict>
<key>AllowNoDNS</key>
<integer>1</integer>
<key>apn</key>
<string>goam.com</string>
<key>password</key>
<string>wap</string>
<key>username</key>
<string>wapuser1</string>
</dict>
<key>Version</key>
<integer>2</integer>
</dict>