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First VPS — Is 54 SSH bans in 12 hours normal? (lemmy.ml)

submitted 2 weeks ago by tanka@lemmy.ml to c/selfhosted@lemmy.world

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So it's my first time setting up a VPS. Is it to be expected to ban 54 IPs over a 12h timespan? The real question for me is whether this is normal or too much.

$ sudo fail2ban-client status sshd
Status for the jail: sshd
|- Filter
|  |- Currently failed: 3
|  |- Total failed:     586
|  `- Journal matches:  _SYSTEMD_UNIT=ssh.service + _COMM=sshd
`- Actions
   |- Currently banned: 51
   |- Total banned:     54
   `- Banned IP list:   [list of IPs]

fail2ban sshd.conf

$ sudo cat /etc/fail2ban/jail.d/sshd.conf 
[sshd]
enabled = true
mode = aggressive
port = ssh
backend = systemd
maxretry = 3
findtime = 600
bantime = 86400

I have disabled SSH login via password. And only allow it over an SSH key.

$ sudo sshd -T | grep -E -i 'ChallengeResponseAuthentication|PasswordAuthentication|UsePAM|PermitRootLogin'
usepam no
permitrootlogin no
passwordauthentication no

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[–] Toribor@corndog.social 8 points 1 week ago

Switching SSH to a non-standard port can cut down on log noise but it doesn't really help with security. It's trivial to identify ssh running on any port and attackers typically do full port scans anyway.

I'd put that effort towards allowlisting only trusted public ips or setting up wire guard/tailscale for ssh access instead.