i can that

my main computer ---------------------------Tp link TL SG2109web ( 8 port gigabit switch )
Dlink dns 323 ---------------------------------Tp link TL SG2109web
SMC D3GN cable modem ---------------------Tp link Tl SG2109web (4 port router as well,dont use it as one
2nd computer----------------------------------Tp link Tl SG2109web
everything is plugged into the tplink
right now my dlink has a ip of 99.233.170.75
i can access it via weblogon, and easysearch but cant connect drives
this is the same set up ive been using for about 4 months , when 2 days ago it suddenly stopped, around the time i updated to firmware 108