Network bridge error

Hi,

i've tried to bridge my eth1 with the tap0 device for using it with openvpn in bridging modus.

I've executed the brctl addbr command as follows: 'brctl addbr br0' which leads to the following error:

add bridge failed: Invalid argument

I've tried to update bridge-utils but I can't find a newer version then 1.2.1.

Attached you can find a strace output fpr my brctl command. It would be nice if someone could help me out with this problem...

readynas-pro:~# strace brctl addbr br0
execve("/usr/sbin/brctl", ["brctl", "addbr", "br0"], [/* 15 vars */]) = 0
brk(0)                                  = 0x804e000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xf7ee3000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=18669, ...}) = 0
mmap2(NULL, 18669, PROT_READ, MAP_PRIVATE, 3, 0) = 0xf7ede000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/libsysfs.so.1", O_RDONLY)    = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\220%\0"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=44792, ...}) = 0
mmap2(NULL, 47852, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xf7ed2000
mmap2(0xf7edd000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa) = 0xf7edd000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260e\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1294572, ...}) = 0
mmap2(NULL, 1300080, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xf7d94000
mmap2(0xf7ecc000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x138) = 0xf7ecc000
mmap2(0xf7ecf000, 9840, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xf7ecf000
close(3)                                = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xf7d93000
set_thread_area({entry_number:-1 -> 12, base_addr:0xf7d93ad0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
mprotect(0xf7ecc000, 4096, PROT_READ)   = 0
munmap(0xf7ede000, 18669)               = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
brk(0)                                  = 0x804e000
brk(0x806f000)                          = 0x806f000
open("/proc/mounts", O_RDONLY)          = 4
fstat64(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xf7ee2000
read(4, "rootfs / rootfs rw 0 0\n/dev/md0 "..., 1024) = 456
close(4)                                = 0
munmap(0xf7ee2000, 4096)                = 0
lstat64("/sys/class/net", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
ioctl(3, 0x89a0, 0xff895eab)            = -1 ENOPKG (Package not installed)
ioctl(3, SIOCSIFBR, 0xff8953e0)         = -1 EINVAL (Invalid argument)
write(2, "add bridge failed: Invalid argum"..., 36add bridge failed: Invalid argument
) = 36
exit_group(1)                           = ?
Process 3005 detached