Using an ASA and a single inside interace as your gateway for your CCIE Collaboration Lab

Before you think it will be a wonderful idea to run everything through your ASA as the default gateway of your lab, keep in mind that hairpins/u-turns off an ASA are not the best design.  For this reason you may have a bit of configuration to do. Please follow the current Cisco guide when you using an ASA your gateway device.

Found here:
https://supportforums.cisco.com/t5/security-documents/hairpin-u-turn-traffic-off-an-interface-on-an-asa-running-8-3-or/ta-p/3129668

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