can not connect to ipv6 ftp

```
I am run Napt66 on a linux route, kernel is  2.6.32-5. On the router,I can`t 
connect to ipv6 ftp, such as "run6.hit.edu.cn". On the client PC, try to 
connect ipv6 ftp, the router crash. When removed napt66 module, I can connect 
ipvt ftp on router.
what`s wrong with me, please help me.
```

Original issue reported on code.google.com by `feiqi...@gmail.com` on 29 Nov 2011 at 3:31
