Ping enabling

The following topic concerns users of Windows XP and Windows Vista.

Contemporary default setting of Windows Firewall disables ICMP ECHO_REQUEST (PING), so the computer cannot reply to it. If checking program does not record ICMP_REPLY from a computer during period of 6 months, the computer is considered as cancelled. Its IP address can be then assigned to another applicant and the cancelled computer loses its connectivity. The duty of the PING response is introduced in Rules for IP LAN users (A Commented Extract, the last point).

The checking program runs in the Cukrovarnicka network 147.231.126.0/23 (255.255.254.0).

To avoid an unwished cancellation of IP address make sure that your computer answers to PING requests. To check if your computer answers to the PING, login preferably on cedr.fzu.cz and launch the following command:

ping <your_IP_address>

ping <name_of_your_computer >

If your computer does not answer set your firewall as follows:

How to set the firewall in Windows XP Service Pack 2:

If you don't like clicking and you are not afraid of writing directly into registry you can import the allowing rule. Restart is needed.

Otherwise:

Start -> Control Panel -> Network Connections ->
Local Area Connection (right click) ->
Properties -> Advanced tab -> Windows Firewall ... Settings ->
Advanced tab-> ICMP ... Settings ->
[v] Allow incoming echo request

How to set the firewall in Windows Vista:

At first it is necessary to choose an appropriate Profile from the three available ones. For the inside IOP Network is the profile "Private" the right choice. The profile "Public" is more restrictive and is intended for connectivity in coffee shops, hotels, airports and so on. The profile "Domain" is appropriate for Windows environment with a domain controller only. The profile Private / Public are set as follows:

Start -> Control Panel -> Network and Sharing Center -> Customize , choose Private.

If you don't like clicking and you are not afraid of writing directly into registry you can import the allowing rule. Restart is needed.

Otherwise:

Start -> Control Panel -> Administrative Tools (1) (double click)->
                    Remark (1) - If not visible, click on "Classic View"
  Windows Firewall with Advanced Security (double click) ->
     read and remember in the middle field Overview which Profile is Active, then click on the left side on
      Inbound Rules and find for the active profile the rule named
    File and Printer Sharing (Echo Request - ICMPv4...)(right click)->
          Properties (click) ->
          on the General tab choose Enabled and Allow the connections and on the Scope tab add into Remote IP address field subsequently these IP addresses:
          147.231.126.0/23 , 147.231.26.0/23 , 10.26.0.0/16 , 10.126.0.0/16 -> OK

Thanks for your collaboration,

IOP LAN Administration, technici (@) fzu.cz