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lyberis19179
lyberis19179
New Member
November 18, 2016
Question

Disable Ping to Servers

  • November 18, 2016
  • 1 reply
  • 6663 views

Dear all good Morning,

 

Im having the fortigate 100D model with the 5.4.1 firmware and I'm wondering how to disable the ping to my servers that are in my network. The scenarios are the following.

 

Block from outside to internal --> scan and ping

Block from internal lan --> scan and ping

 

My network is a 192.168.0.0/20 // my servers are in 192.168.1.0/20

 

Any ideas would be helpful. Hope to return the help in future posts.  

    1 reply

    ede_pfau
    SuperUser
    ede_pfau
    SuperUser
    November 19, 2016

    hi,

    and welcome to the forums.

     

    I hope I get what your question is about - if not, please clarify.

     

    How do you block ping (ICMP) from WAN to internal?

    well, as long as you don't ALLOW it explicitly it won't reach your servers. I assume you have VIPs for remote access to internal servers. If these VIPs are port forwarding ICMP is not translated unless you set the 'set protocol icmp' option. Same for the policy the VIP is used in, if 'service' doesn't contain ICMP/ping this traffic will be blocked.

     

    ping from internal host to internal host/server

    This is different. As long as both hosts are within the same subnet their traffic will not cross the FGT, and thus cannot be controlled. This is the main reason why you would put a server (or a server farm) onto it's own subnet and FGT port - full control on the traffic going to and coming from the servers.

     

    If your main concern is ICMP flooding (port scans using ICMP) then primarily the same applies. You only have to take action if you want to allow pings by default. Then, ICMP flooding can be caught by a DoS sensor.

    lyberis19179
    lyberis19179Author
    New Member
    November 23, 2016

    That covers it all. Thanks for the explanation mate.

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