On 20.7.2011 12:51, Timothy Murphy wrote:
Further to my question, how can I determine if it is the Billion 5200S modem/router that is preventing pings, or if it is the CentOS-6 MicroServer attached to the modem/router?
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Is there any simple way, short of using something like ethereal, of determining if ICMP packets are reaching the computer, and being rejected there?
I would use tcpdump on the CentOS Server to be sure the icmp echo requests are arriving or not. tcpdump is something like ethereal but it could be as easy as
$ tcpdump -l proto \icmp or $ tcpdump -l proto \icmp and host sourceip or $ tcpdump -li ethX proto \icmp or ...