I want to block my server talking to an external IP address continously.

The IP address in question is I think is being hijacked or spoofed. When Used who.is it resolves to Netherlands. But if you use any other tools it resolves to Jordan.

Any step by step configuration is highly appreciated.

Thank you Kind Regards N

  • 1
    If your ASA 5505 came without the Cisco ASA 5500 Series Configuration Guide using ASDM, there is a free copy available on their website. We can help, if you have a problem in understanding some details, but we are not paid for doing your job, like trivial firewall rules. May 7, 2017 at 10:33
  • @EsaJokinen, thank you. You are been so kind. First of its nature. but thank you. May you live in peace and harmony. May 8, 2017 at 14:06

1 Answer 1



You can temporarily shun from the ASA's command line.

  • if I run this cmd, will that block all the connection from the firewall ? May 8, 2017 at 14:07
  • Yes. As in Cisco ASA 5500 Series Command Reference, 8.2, shun source_ip: "To block connections from an attacking host, use the shun command in privileged EXEC mode. To disable a shun, use the no form of this command." May 8, 2017 at 14:10

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