SSH Config file

vi ~/.ssh/config

Host *
        HostKeyAlgorithms +ssh-dss
        MACs hmac-sha1
        Ciphers aes256-ctr,aes128-cbc
        # KexAlgorithms diffie-hellman-group-exchange-sha256

        KexAlgorithms diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

Host old_host

  HostKeyAlgorithms +ssh-dss

  KexAlgorithms +diffie-hellman-group1-sha1

  Ciphers aes256-ctr,aes128-cbc

ssh option name check 

ssh -Q cipher       # List supported ciphers
ssh -Q mac          # List supported MACs
ssh -Q key          # List supported public key types
ssh -Q kex          # List supported key exchange algorithms