filtered ports

[warlord at MIT.EDU (Derek Atkins)]

You can try using 'traceroute -p 22 your.home.host.name' to attempt
to see where it fails.  It may not work if they specifically block
TCP/22 and not UDP/22, but most likely they're not that bright ;)

-derek

Kent Borg <kentborg at borg.org> writes:

> On Fri, Nov 02, 2001 at 01:40:40PM -0500, Matthew J. Brodeur wrote:
> >    You didn't mention whether the nmap scan was from a local or remote
> > machine.  If it was remote then your ISP could be blocking ports for you.
> > I don't know of any currently blocking 22, but it's possible.  If that's
> > the case, I'd complain LOUDLY.
> 
> My ISP, Galaxy DSL (gis.net), also seems to be blocking port 22.  The
> support people seem quite willing to unblock it but can't figure out
> where or how.  I am thinking that the CLEC (NAS) is doing the
> blocking.  I would appreciate any advice on exactly what to suggest
> for how to unblock it.  (And unblock everything.)
> 
> I know that to get the NATing DSL Pipe modem/router they control to
> default all inbound ports to the internal IP of my server (not just a
> badly limited list) I had to read the manual myself, fax gis.net the
> page for exactly what needed to be done, and get them to tell NAS
> exactly what to do.  The GIS support people said were grateful to know
> how to do that.
> 
> I am thinking there must be a way to figure out the IP number of
> exactly where the block happens and then track down who controls that
> box.  But I haven't figured out how yet.
> 
> In the meantime, I am running my ssh on an unblocked port.
> 
> 
> Thanks,
> 
> -kb, the Kent who is reasonably pleased with his DSL in that is it up
> mostly, lets him run servers, hasn't gone out of business, the CLEC
> hasn't gone out of business, and is affordable.
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord at MIT.EDU                        PGP key available