[tlug] SSH set up issues

[Charles Muller <acmuller@example.com>]

TLUGers,

For the first time in many years, I am setting up SSH on a fresh install 
of Linux. I have installed Ubuntu 24, and the server I am connecting to 
is running on CentOS 6. I have a couple of older machines around me that 
are SSHing to it with no problem. But when I try to do SSH from this new 
install (after generating a key), I get the following error message:

~$ ssh acmull5@192...

          Unable to negotiate with 192… port 22: no matching
          host key type found. Their offer: ssh-rsa,ssh-dss

I tried copying my settings from the older machines, but got the same 
result.

Based on various suggestions I found on the web, I was able to work 
around it by inserting the following text in .ssh/config:
 Host linserv
    HostName 192…..
    User acmull5
    HostKeyAlgorithms +ssh-rsa
    PubkeyAcceptedKeyTypes +ssh-rsa

So I now I can log on with:

   ssh linserv

…but I would prefer to be able to log on with my original method of SSH 
followed by the actual server address number. I want to keep consistency 
among my machines, and I also need to log on from inside of other 
programs such as rsync.

Example:
 rsync -uvptlW -e ssh $winD/docs/web/dicts/dealt/*.xml 
acmull5@192...:/dicts/dealt/

So I have two questions:

(1) is there a way I can configure SSH so that I can log in with just 
the number rather than a variable?

(2) If that is not possible, is there a way I can encode my rsync 
scripts to use the variable name instead of the actual numerical code?

Regards,

Chuck