The Linux networking code is still an evolving thing. It still has bugs though
they are becoming less frequently reported now. The
Linux Networking News
is a World Wide Web page maintained by Alan Cox which contains information
on the status of the NET-3 networking code. You can obtain information
on what is known and what isn't, by reading the
/usr/src/linux/net/inet/README file that accompanies the kernel
source, or by joining the linux-net channel.