custom ICMP message in iptables

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Dear all,


I'm wondering that, is there any method to add custom ICMP message to iptables ... e.g say I block Echo Request (ping) through system-config-firewall, other systems on my network cannot ping my system ... but on on the system from where I try to ping .. it shows message like [1]

[1] From xxx.xxx.xxx.xxx icmp_seq=xxx Destination Host Prohibited
     From xxx.xxx.xxx.xxx icmp_seq=xxx Destination Host Prohibited
     From xxx.xxx.xxx.xxx icmp_seq=xxx Destination Host Prohibited
     From xxx.xxx.xxx.xxx icmp_seq=xxx Destination Host Prohibited

problem is that anyone can determine that my system is alive and icmp request is blocked


instead  of this I want like this [2]

[2]  From xxx.xxx.xxx.xxx icmp_seq=xxx Destination Host *Unreachable *
      From xxx.xxx.xxx.xxx icmp_seq=xxx Destination Host *Unreachable *
      From xxx.xxx.xxx.xxx icmp_seq=xxx Destination Host *Unreachable *
      From xxx.xxx.xxx.xxx icmp_seq=xxx Destination Host *Unreachable
*

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