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We force IPv4, compress the stream, specify the cypher stream to be Blowfish. I suppose you could use aes256-ctr as well for cypher spec. I'm of course leaving out things like master control sessions and such as that may not be available on your shell although that would speed things up as well.
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You are right in using "Harder" since this command is harder to type than "ssh". :-) To speed test other ciphers, the openssl command provides a speed test which you can run on your own machine:
openssl speed aes rc4 blowfish@bwoodacre Thats why you alias it in your .bashrc. External programs who call it won't be calling the alias.
Or put this in ~/.ssh/config to do the same thing in a more readable way and avoid the alias:
Host *
AddressFamily inet
Compression yes
Cipher blowfish
Forcing ipv4 seems a bit pointless & short-sighted. I for one use IPv6 almost exclusively on my LAN.
The rest of the world unfortunately uses 4, but 6 can be forced as well. You use it for domains, ex:
[alias'd SSH] srv1.domain.com -p 3345