/dev/tun vs /dev/net/tun

I am mounting the /dev/tun device of an IllumOS installation (actually OmniOS, but I don't think it makes a difference) inside a lx-brand zone (using add device, set match=\dev\tun, end). Problem is, the CentOS inside the zone expects the tun device to be in /dev/net/tun, not /dev/tun, so OpenVPN is not working. It complains that /dev/net/tun does not exist, which I guess makes sense. What is the difference between having the tun device in /dev or in /dev/net? More importantly, how can I make this work? I have tried symlinking /dev/tun in /dev/net/tun both in IllumOS and in CentOS, but it's not letting me. Any help is appreciated. EDIT: Thanks to the comments I am now able to trick the system into believing that /dev/net/tun exists, however even when trying tunctl -t tun0 -f /dev/tun I get TUNSETIFF: Inappropriate ioctl for device. The full strace is below: execve("/sbin/tunctl", ["tunctl", "-t", "tun0", "-f", "/dev/tun"], [/* 20 vars */]) = 0 brk(NULL) = 0x6020e0 uname({sysname="Linux", nodename="centos-zerotier", ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fffef240000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=26396, ...}) = 0 mmap(NULL, 26396, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fffef040000 close(3) = 0 open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\35\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=2127336, ...}) = 0 mmap(NULL, 3940800, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fffeec00000 mprotect(0x7fffeedb8000, 2097152, PROT_NONE) = 0 mmap(0x7fffeefb8000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1b8000) = 0x7fffeefb8000 mmap(0x7fffeefbe000, 16832, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fffeefbe000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fffef030000 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fffef020000 arch_prctl(ARCH_SET_FS, 0x7fffef020740) = 0 mprotect(0x7fffeefb8000, 16384, PROT_READ) = 0 mprotect(0x601000, 4096, PROT_READ) = 0 mprotect(0x7fffef421000, 4096, PROT_READ) = 0 munmap(0x7fffef040000, 26396) = 0 open("/dev/tun", O_RDWR) = 3 stat("/etc/sysconfig/64bit_strstr_via_64bit_strstr_sse2_unaligned", 0x7fffffefefb0) = -1 ENOENT (No such file or directory) ioctl(3, TUNSETIFF, 0x7fffffeff460) = -1 ENOTTY (Inappropriate ioctl for device) dup(2) = 4 fcntl(4, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE) brk(NULL) = 0x6020e0 brk(0x6230e0) = 0x6230e0 brk(NULL) = 0x6230e0 brk(0x624000) = 0x624000 fstat(4, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 2), ...}) = 0 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fffef010000 write(4, "TUNSETIFF: Inappropriate ioctl f"..., 42TUNSETIFF: Inappropriate ioctl for device ) = 42 close(4) = 0 munmap(0x7fffef010000, 8192) = 0 brk(NULL) = 0x624000 brk(NULL) = 0x624000 brk(0x623000) = 0x623000 brk(NULL) = 0x623000 exit_group(1) = ? +++ exited with 1 +++