[ILUG] Testing for blocked ports / protocols.

[Christian Koerner]

Hi Darragh,

Hope you are doing well! :)

Darragh Ó Héiligh wrote:
> Thanks,  I'd thought of NMap but is there anything that will do a more
> comprehensive scan?
> 
> Thanks
> 

Well another possibility is to use telnet, but I would use it only if
you have a few ports you want to test or you can try hping.


Best Regards,
Christian

> 
> 
> 
> 2008/5/2 Luke Ashe-Browne <xactly at gmail.com>:
> 
>> I would say that doing nmap to test protocols would be one way, however
>> that is a form of port scanning which alot of routers/firewalls will drop
>> when detected and just seem like everything is blocked. So unless you can
>> disable detection of port scans, try that out?
>>
>>
>> Darragh Ó Héiligh wrote:
>>
>>> Afternoon all,
>>>
>>>
>>>
>>> I hope you're having an equally uneventful Friday.
>>>
>>>
>>>
>>> I've been asked to look into a problem with a new RAS solution.  The
>>> Juniper
>>> router / firewall that we're now using seems to be blocking most
>>> protocols.
>>> Http seems to be the main one that comes to mind that is not blocked.
>>>
>>>
>>>
>>> I've set up a test lab here with a DSL connection with a Juniper router
>>> connected and will use a laptop running Ubuntu to try to figure out what
>>> protocols are being blocked and if it is actually a problem with the
>>> router/
>>> firewall or although unlikely, with the central firewall.
>>>
>>>
>>>
>>> Is there a way that anyone can tell me of testing the connection for
>>> blocked
>>> protocols or ports?
>>>
>>>
>>>
>>>
>>>
>>> TCPDump may do it but I could really do with a kick in the right
>>> direction.
>>>
>>>
>>>
>>> Thanks
>>>
>>>
>>>
>>>
>>>
>>> Darragh
>>>
>>> www.digitaldarragh.com
>>>
>>> a
>>>
>>>