DE2_115 Board not respond to ping request

I think your ImgBuff should be

unsigned int ImgBuff;

As for the download message it is perfectly normal. The nios download command firsts writes the exception vector at the bottom of the SRAM and then jumps 32 bytes. That's why you see a second line with the address just incremented by 20 hexa. Rounded in % it will still give you 0 because the jump was very small compared to the application size.

EDIT: from what I can see the VIC connections look correct.