Ed Greshko wrote: > On 21/04/2021 08:29, Todd Zullinger wrote: >> 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. > > OK, I confused myself by using IP:port. > > But still.... > > [root@f33g ~]# ncat -l -4 192.168.122.26 53 > Ncat: bind to 192.168.122.26:53: Cannot assign requested address. QUITTING.
Do you have a 192.168.122.26 interface on the host? That's the error I see if I try to use an IP which is not assigned to any interface. If that's the issue, you could create an alias for an existing interface with that IP and use it for testing. -- Todd
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