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Additional IPv4s

ServerBachelorServerBachelor Member
in Help

Let’s suppose I have two IPv4s associated with the same VPS. If I point domain A’s A record to the first IP, and domain B’s A record to the second IP, would it be possible for a website viewer to see that the two sites are being hosted on the same VPS (such as with reverse IP lookup tools?)

Comments

  • SaragoldfarbSaragoldfarb Member, Megathread Squad

    No.

    Thanked by 1ServerBachelor
  • tdworztdworz Member

    Generally speaking, no.

    It may be possible to see the IP addresses are used by hosts at the same physical location or that the IP addresses are offered by the same provider. However, to see that both IPs are assigned to the same VPS is not possible.

    That being said, it is possible that the software running on the VPS can give this information away, or at least that it might give away clues. But that's a matter of your competence and control.

    Thanked by 1ServerBachelor
  • ServerBachelorServerBachelor Member

    @tdworz said:
    Generally speaking, no.

    It may be possible to see the IP addresses are used by hosts at the same physical location or that the IP addresses are offered by the same provider. However, to see that both IPs are assigned to the same VPS is not possible.

    That being said, it is possible that the software running on the VPS can give this information away, or at least that it might give away clues. But that's a matter of your competence and control.

    Got it, thanks!

  • tentortentor Member, Host Rep

    @ServerBachelor said: If I point domain A’s A record to the first IP, and domain B’s A record to the second IP, would it be possible for a website viewer to see that the two sites are being hosted on the same VPS

    If your visitor is an advanced user, and if SSH is exposed to both IPv4 addresses, they can compare host keys and if they're equal it is safe to assume that both IPv4 addresses are served by the same server.

    Thanked by 1ServerBachelor
  • ServerBachelorServerBachelor Member

    @tentor said:

    @ServerBachelor said: If I point domain A’s A record to the first IP, and domain B’s A record to the second IP, would it be possible for a website viewer to see that the two sites are being hosted on the same VPS

    If your visitor is an advanced user, and if SSH is exposed to both IPv4 addresses, they can compare host keys and if they're equal it is safe to assume that both IPv4 addresses are served by the same server.

    How can I disable SSH for one of the IPs?

  • tentortentor Member, Host Rep

    @ServerBachelor said:

    @tentor said:

    @ServerBachelor said: If I point domain A’s A record to the first IP, and domain B’s A record to the second IP, would it be possible for a website viewer to see that the two sites are being hosted on the same VPS

    If your visitor is an advanced user, and if SSH is exposed to both IPv4 addresses, they can compare host keys and if they're equal it is safe to assume that both IPv4 addresses are served by the same server.

    How can I disable SSH for one of the IPs?

    From man sshd_config:

           ListenAddress
               Specifies the local addresses sshd(8) should listen on.  The following forms may be used:

                     ListenAddress hostname|address
                     ListenAddress hostname:port
                     ListenAddress IPv4_address:port
                     ListenAddress [hostname|address]:port

    Specify specific address or restrict access to the 22/tcp using firewall (allow only one destination IP address).

    Thanked by 1ServerBachelor
  • SteveMCSteveMC Member

    Someone can try to access Domain 1 with the IP 2 and see if he receives an answer.

    Thanked by 1ServerBachelor
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