18th April 2014 

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Table of Contents
Network-Attached Storage
The SMC NAS Unit
What a NAS file server should be...
Configuring the Barricade
Storage Management Group
Firewall Testings
Network Filtering
Inside the Barricade
Executive Summary

SMC 8-Port 10/100 Storage Server
Page 7 of 12

Firewall Testings
As usual, it is important to test the firewall capabilities of the router. I decided to do some good old port sniffing to see what’s going on behind the router. Using nmap v2.53, I got the following results:

Starting nmap V. 2.53 by fyodor@insecure.org ( www.insecure.org/nmap/ )
Interesting ports on (
(The 1519 ports scanned but not shown below are in state: closed)

Nmap run completed -- 1 IP address (1 host up) scanned in 1 second

Yep, as you can see from the results returned by nmap, 4 ports are opened. I snooped around by telneting into Port 80 directly and got the following results:

Connected to
Escape character is '^]'.

Date: Wed, 14 Mar 2001 04:11:24 GMT
Server: Apache/1.3.3 (Unix) (Red Hat/Linux)
Connection: close
Content-Type: text/html

Woah! So the Barricade is actually running on a copy of Red Hat Linux with Apache v1.3.3.

I repeated the same procedure for Port 3128:

Connected to
Escape character is '^]'.

Server: Squid/2.3.STABLE4
Mime-Version: 1.0

For those Unix fans, you will have heard of Squid, a very popular proxy server which is being used by many ISPs in the world. The SMC can actually double as a proxy server for your local intranet and features some very powerful filtering which you can impose on your users. I will go into more detail later.

Now, port 139 is the SMB (Server Message Block) protocol which is widely used for file sharing in Windows NT / 2000. In Windows NT, it is run on top of NBT (NetBIOS over TCP/IP). Ports 137, 138 (UDP) and 139 (TCP) are used. In Windows 2000, Microsoft added the possibility to run SMB directly over TCP/IP, without the extra layer of NBT. For this they use TCP port 445.

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