-util.c: sort out logging
-
-sha1.c: test
-
-General: separate the transforms in transform.c into multiple parts,
-which can then be combined in the configuration file. Will allow the
-user to plug in different block ciphers, invent an authenticity-only
-mode, etc.
-
-Signal handling! Really just cope with SIGCHLD and SIGTERM. Possibly
-use SIGUSR1/2 for prodding things.
+tun.c: jdamery reports tun-old code works on Linux-2.2.
+Unresolved problem with ioctl(TUNSETIFF) sometimes returning EINVAL, seems
+to be related to early 2.4.x (x<=5) series kernels. 2.4.9 and above seem ok;
+2.4.[678] untested.