Re: Suspected nmap listing - am I under attack?

[Zapotek <zapotekzsp () gmail com>]

Filtered in your case means that the services that use these ports are 
not accessible from the outside world.
Try to telnet your machine from a remote server, I bet you won't get a 
connection.

I hope I answered your question,
Zapotek.

fahimdxb () gmail com wrote:
> Did an nmap scan on my Cisco router from the outside world. Found the following output:
>
> Interesting ports on *.*.*.1:
>
> Not shown: 1676 closed ports
> PORT      STATE    SERVICE
> 23/tcp    filtered telnet
> 135/tcp   filtered msrpc
> 1524/tcp  filtered ingreslock
> 27665/tcp filtered Trinoo_Master
>
> There is a Cisco PIX behind the inside interface though I ran nmap from across the serial.
> What does the state "filtered" signify?
>
> How can I be sure if I have been used as an agent for launching DDoS attack?
>
> Please advise!!
>
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This list is sponsored by: Norwich University

EARN A MASTER OF SCIENCE IN INFORMATION ASSURANCE - ONLINE
The NSA has designated Norwich University a center of Academic Excellence 
in Information Security. Our program offers unparalleled Infosec management 
education and the case study affords you unmatched consulting experience. 
Using interactive e-Learning technology, you can earn this esteemed degree, 
without disrupting your career or home life.

http://www.msia.norwich.edu/secfocus
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