On 07/03/2014 02:36 PM, Rick Stevens wrote:
You could use traceroute with a "-T" option (to try a TCP SYN probe), but you also need to specify a port you know the machine is listening on but is NOT blocked by the ISP. Most ISPs don't block SSH on port 22, so a "traceroute -T -p 22 <ipaddress>" may succeed IF you have sshd listening on port 22. No guarantees, however.
You can also use -I to make it use ICMP ECHO for the probes, but that requires root.
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