[Bug 218508] Tunneling and aliases using the tun device, reusing a destination address works with IPv4, but not IPv6

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218508

dmilith <dmilith at me.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dmilith at me.com

--- Comment #1 from dmilith <dmilith at me.com> ---
I have same bug on 12.1… "file exists":

```
socket(PF_INET,SOCK_DGRAM|SOCK_CLOEXEC,0)        = 3 (0x3)
ioctl(3,SIOCGIFINDEX,0x7fffffff9f20)             = 0 (0x0)
close(3)                                         = 0 (0x0)
__sysctl(0x7fffffff9f40,0x6,0x0,0x7fffffff9f38,0x0,0x0) = 0 (0x0)
__sysctl(0x7fffffff9f40,0x6,0x80161e000,0x7fffffff9f38,0x0,0x0) = 0 (0x0)
socket(PF_INET6,SOCK_DGRAM,0)                    = 3 (0x3)
ioctl(3,SIOCDIFADDR_IN6,0x1054278)               ERR#49 'Can't assign requested
address'
ioctl(3,SIOCAIFADDR_IN6,0x1054278)               ERR#17 'File exists'
ifconfig: write(2,"ifconfig: ",10)                       = 10 (0xa)
ioctl (SIOCAIFADDR)write(2,"ioctl (SIOCAIFADDR)",19)             = 19 (0x13)
: write(2,": ",2)                                        = 2 (0x2)
File exists
write(2,"File exists\n",12)                      = 12 (0xc)
exit(0x1)
process exit, rval = 1
```

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