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To add to the other answers, there is one word of caution I have encountered (in the form of a notice on the ArchWiki) when reading about tools like denyhosts (e.g. Fail2ban): Warning: Using an IP blacklist will stop trivial attacks but it relies on an additional daemon and successful logging (the partition containing /var can become full, especially if ...


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Thanks to both @Michael Hampton and @Dan for important pieces of information. The ip domain-name was already set, but when I enabled SSH by using the keypair name, that worked properly. So, in short: if your router has RSA keys generated, but won't enable SSHv2, enable SSH with the name of the RSA keys, like so: ip ssh rsa keypair-name <name> ...



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