IPTables prevents pings on Piaf, as the type of server can be identified by the ping reply, and hence the potential hacker knows which toolbox to reach for.
if you type service iptables stop, then you will be able to ping, and service iptables start with start them up again, and they will come back up on reboot.
Joe
Is there any other server or router or switch or maybe hardware firewall on the network that might be prefenting you from pinging?
Remember to forward the sip ports to your PiaF box.
iptables -A INPUT -p icmp --icmp-type 8 -s 192.168.64.0/18 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -p icmp --icmp-type 0 -d 192.168.64.0/18 -m state --state ESTABLISHED,RELATED -j ACCEPT
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