> I looked at the code, in fact, it doesn't do icmp echo requests, it
> does tcp echo requests on port 7.
UDP, not TCP.
> But I'm confused, why does it work for ntp but not for echo and dns?
I've just checked, and it works for me. Perhaps you have some weird
firewall setup?
> The code is very simple,
Yes, simplicity of implementation is the main reason I avoided ICMP.
Juliusz
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