Ljubomir Ljubojevic wrote: > ICMP packets are blocked by Billion, it's 99% chance, since public IP > resides on the Billion. Only way (known to me) to pass ICMP to your > CentOS server (on cheap modem/routers) is to do 1:1 NAT (all connections > to all ports are redirected to system behind it with set IP). > > If you need to be able to ping CemtOS system and not Billion, then you > should set modem to bridge mode and pass public IP to CentOS. But caveat > is that this would mean that if you turn on CentOS firewall or set it > improperly you would be wide open, and that you will not be able to > willfully bypass CentOS server (if he is down) and just plug PC's to > modem directly. Thanks for the response. I don't really mind if external sites cannot ping the machine; I was just a little surprised at this, particularly as I didn't see anything about it in the documentation. I'll try asking on the Billion site. -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland