Filtering ICMP messages without the response "packet filtered"
A customer is requesting me to filter ICMP messages on a router. Fine no problem but he specifies that there is a security issue if I block all ICMP messages. According to this customer blocking all will generate a "packet filtered" message back to the sender that will reveal the existance an the IP address of the router. What message type should I not filter to prefent this.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...