# Re: \[PATCH v2\] add stealth mode

- From: Matteo Croce \<hidden\>
- Date: 2015-07-07 15:24:54 
- List: netdev
- Page: https://ratatoskr.run/netdev/2015/07/4529204
- Thread: https://ratatoskr.run/netdev/2015/07/4527884/t.md

```text
2015-07-07 9:01 GMT+02:00 Clemens Ladisch [ref]:
> Valdis.Kletnieks@vt.edu wrote:
>> On Thu, 02 Jul 2015 10:56:01 +0200, Matteo Croce said:
>>> Add option to disable any reply not related to a listening socket
>>
>> 2) You *do* realize that this isn't anywhere near sufficient in order
>> to actually make your machine "invisible", right?  (Hint: What *other*
>> packets can be sent to a machine to provoke a response?)
>
> Even worse: if you want to pretend that the entire machine is "not there",
> you must make the router in front on you reply with an ICMP "destination
> unreachable" message.

You can't do sometimes, like in DSL lines where the router in front of
you is an ISP owned DSLAM

-- 
Matteo Croce
OpenWrt Developer
```