Try Telnet.. if it works you can.
"Can I ping?" Try to ping a known host.
"Can I ftp?" Try a well known site.
"Can I UseNet?" Use your newsreader, point to a remote NNTP server
"Can I http?" Try a browser
"Can I rlogin?" The answer to this one better be no.
you get the idea... :)
Sound advice. However, if, for example, I cannot telnet to
somehost.someplace.com, does that mean that
a> the firewall doesn't allow it?
b> somehost.someplace.com is down?
c> my ip stack is misconfigured?
d> some internal router is hosed?
e> the Internet has been dismantled by the FCC?
you get the idea... ;)