...

ciscoasa# config t
ciscoasa(config)# group-policy POLICY attributes
ciscoasa(config-group-policy)# split-dns value internal.local extenralexternal.com

Troubleshooting

debug ISAKMP SA negotiations

...

Adding Self Signed Certificates

Via GUI

1. Open the ASDM and Navigate to the Configuration Button>Click Remote Access VPN (At the bottom)>Drop down Certificate Management>Click Identify Certificates 
   1. 
2. In the right Pane, click on the Add Button 
   1. 
3. Name the certificate, Check the "Add a new identity certificate" radial, Add check marks 
   1. 
4. Afterwards, Navigate to Device Management>Advanced>SSL Settings 
   1. Image Added
5. From here, remove any Active Algorithms that you do not want, choose the outside interface that you will access the VPN through and click Edit, choose the self-signed certificate in the drop down list for Primary Enrolled Certificate and click OK. 
   1. Image Added
6. Apply & Save