Found answer in another thread
by jonkam - 4/26/12 9:56 PM
In Reply to: How to connect (wired setup) Sony Blue ray player to DSL by rpinjala
The question initially went up over a year ago...
Since I found what worked for me and don't see that answer here, I'll post it.
On your 2Wire Firewall advanced settings, uncheck packet flood. For some stupid reason Sony firmware needs ICMP to stream media, and that takes care of it.