I have a client with a FOG server on subnet A and when uploading an image from subnet A it takes about 15 minutes. However when uploading an image from subnet B (layer 3 network) it takes about a day. The process appears to just hang at points.

Deploying an image from subnet A to subnet B works well. (IGMP snooping is enabled)

What protocol does FOG use for uploading images? Any other thoughts as to what is going on?