Re: ncat and resolved

[Todd Zullinger]

Hi Ed,

Ed Greshko wrote:
> Does anyone know of a way to get ncat to listen on port 53 when using systemd-resolved?
>
> [root@meimei ~]# ncat -l -4 -p 53
> Ncat: bind to 0.0.0.0:53: Address already in use. QUITTING.

You can't bind to the port if it's already in use.  But if
you're okay with using a local IP, you can bind to 127.0.0.2
(or anything > .1, if resolved or other dns server are
listening on localhost).

$ sudo ncat -l -4 127.0.0.2 53

I didn't use the -p option there, as it's for the source
port.  Using the -p option doesn't do what I presume you
want, which is to have ncat listening on port 53 so you can
connect to it for testing.
> (no rants, please)

Where's the fun in that? ;)