I do not know how to ping our firewall.
As I mentioned before I pinged www.some.where
and servername.some.where with different results, but I suppose these pings did not get through our ISP.
Previously I found an IP address using netstat on that server - I thought it was our actual IP address. Now I do not think so: looking up that IP address gave mail.some.where (which is possibly at our ISP). I also tried tracing www.some.where
which gave me the same IP address. (It may mean something or nothing - I do not know).
I am convinced that it is possible to get through our firewall, since our ISP does it often. I am not sure, however, if our ISP passes through SSH requests to our firewall. I could find it out if I knew how to ping our firewall.
So, how to do that?