John Sladek on 29 Jun 2009 19:07:59 -0700


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Re: [PLUG] Find Open Ports


I suspect his ISP does not allow that...

On Jun 29, 2009, at 10:05 PM, K. Clair wrote:

> wait - i'm confused.
> you're still going to be running your webserver from within your home
> network, right?    if so, what you need to figure out is what outgoing
> ports your employer is blocking or not blocking, no?
>
> (and if 80 outgoing is open, can't you configure your home network to
> listen on port 80?)
>
> -k
>
> On Mon, Jun 29, 2009 at 9:07 PM, Casey  
> Bralla<MailList@nerdworld.org> wrote:
>> My employer is very aggressive in closing off ports.  This makes it  
>> hard for me
>> to access my home network from work.  Luckily, port 23 is open so I  
>> can ssh
>> in, and of course, port 80 is left alone.
>>
>> However, I've got several special web pages that run on computers  
>> behind my
>> firewall.  I access them through port forwarding to non-standard  
>> ports (such as
>> 81 & 82).
>>
>> Unfortunately, since my employer blocks these ports, I can't use  
>> them.   I do
>> have unlimited discretion, however, in assigning my programs to  
>> whatever port
>> I desire.
>>
>> So....  if I knew which ports were NOT blocked, I could use those.
>>
>> BUT...  How do I check to see if what ports are available?
>>
>> So far, I've been able to come up with 2 ideas:  1) scan every  
>> port, and 2)
>> try ports manually one at a time.
>>
>>
>>
>> I could run a portscan on my portable, but that would undoubtedly  
>> raise all
>> kinds of alarms.  Also, I'd have to be sure I was connecting to  
>> something that
>> had those ports active.
>>
>>
>> Does anybody have any suggestions on how to test to see if a series  
>> of ports
>> is not filtered, or have a suggestion of ports that I could test  
>> manually
>> through trial and error?
>> --
>>
>> Casey Bralla
>> Chief Nerd in Residence
>> The NerdWorld Organisation
>>
>> http://www.NerdWorld.org
>> ___________________________________________________________________________
>> Philadelphia Linux Users Group         --        http://www.phillylinux.org
>> Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
>> General Discussion  --   http://lists.phillylinux.org/mailman/listinfo/plug
>>
> ___________________________________________________________________________
> Philadelphia Linux Users Group         --        http://www.phillylinux.org
> Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
> General Discussion  --   http://lists.phillylinux.org/mailman/listinfo/plug

___________________________________________________________________________
Philadelphia Linux Users Group         --        http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion  --   http://lists.phillylinux.org/mailman/listinfo/plug