How can I disable IPv6?

I have access to the IPv6 internet through Charter Communication's 6rd implementation. A number of CDNs fail to work correctly over IPv6, which causes a number of sites, including facebook, to have significant issues (pictures don't load, pages don't load, etc.) On my desktop, I can disable IPv6, and these issues go away. Is it possible to do that on a stock android phone / tablet? (not rooted) _Edit:_ From the comments, I've learned that the actual issue is a MTU issue. So I'd be equally interested in a method to set a lower MTU on android as well.