IPv6 route buffer space problem

["Gianluca" <gianluca@xxxxxxxx>]

Hi, i have a problem when i add more than 500/540 sit interfaces on my linux 
box (debian), if i add a new interface (with iptunnel and ifconfig) i 
haven't errors but when i add a new router for the interface i have this 
error "No buffer space available".
I had search on /proc for increment the buffer but i dont have found 
anythink, i think that i need to modify the kernel sources.
Please help me.

Gianluca.