OSPF Stub Types

I spent this Christmas morning studying and configuring the 3 stub types, Stub Area, Totally Stubby Area, and NSSA (Not So Stubby Area). I'm not going to even ask who came up with those names but the material made since as long as you undertood how it effects the LSA type you receive in that particular area. I also ran into something I NEVER noticed so far in the past 8 months I've been learning about Cisco. If you have two directly connected serial interfaces, you CAN'T ping you're own serial IP address if the other side of the serial link is misconfigured in any way. I spent a better part of 30 minutes troubleshooting this problem and even blaming it on the GNS3 program itself until I did a little research. Even if your serial interface shows up/up, if you can't ping your serial IP it's a good chance there's a misconfiguration on either side of the point-to-point connection. MERRY CHRISTMAS!