Concerned with software or hardware firewalls

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16
votes
12answers
25k views

Public DMZ network architecture

Years ago, when I was a student, a network security professor taught me in a class what a DMZ is. The architecture he used in his slides was similar to this one: Now that I got employed, my boss, a ...
1
vote
2answers
248 views

Are KIS 2014, Malewarebytes Pro and SpyBot sufficient to prevent internet attacks?

As mentionned in the title, I have KIS 2014, Malewarebyte Pro and Spybot installaed on my windows 7 (regularly updated). I regularly scan my pc for viruses and spywares and clean it with Glary ...
1
vote
1answer
255 views

VPN Client - Addtional Security Layer or a Useless Feature

I have a corporate web portal which is used for staff collaboration including a web-based mail interface connected to MySQL Database, corporate calendar, file storage, customer contacts data with ...
2
votes
1answer
105 views

ASA5505 DMZ issue

I have ASA5505 , connected to the WAN on port 0 (called Vlan2), and connected to my development LAN on port 7 (Called Vlan1). I want to add DMZ, and I connected switch and servers to port 3, and ...
0
votes
1answer
33 views

internal proxy server vs DMZ proxy server

What would be reason for placing a proxy server in a Demilitarized Zone (DMZ)? I understand that a DMZ is a separate network to your internal network (lies inbetween internal network and firewall). I ...
2
votes
1answer
224 views

How to configure Suricata to not interfere with virtual machine

I'm currently planning on setting up Suricata as a firewall on my laptop. I'm wondering however if it's possible to set Suricata to not interfere with traffic to and from specific virtual machines ...
1
vote
2answers
447 views

How can I use a proxy appliance as HTTP Proxy & Reverse Proxy at the same time?

I have a BlueCoat ProxySG 810 appliance and want to use it as both an HTTP Proxy Server for clients on the Inside interface of a PIX 525 Firewall (OS Version = 8.0(4)) and a Reverse Proxy Server for ...
0
votes
1answer
25 views

NAT separate firewall or other security tools

It's a conceptual question: Suppose i want to separate NAT and firewall, can it help to my security? INTERNET >>>> NAT >>>> Firewall >>> MyNetwork
6
votes
2answers
2k views

Is server hardening with GRSecurity really necessary on the CentOS 6.3 environment?

I consider myself to be reasonably good with IT, however I am relatively fresh at server and system administration. I am a web developer for my company and I have been charged with setting up and ...
4
votes
3answers
12k views

Best practice to block Dropbox usage

We have users sync their data at company with their home computer. What's the best way to block it? Block *.dropbox.com Find out all dropbox IPs and block IPs. For windows users, deploy GPO to ...
9
votes
6answers
6k views

How important is NAT as a security layer?

I've signed on to help a department move buildings and upgrade their dated infrastructure. This department has about 40 employees, 25 desktops, an old Novell server, and a handful of laboratory ...
2
votes
1answer
7k views

How does pfsense block torrent traffic?

I know that pfsense is a very effective tool for restricting bit torrent traffic. I was wondering how it actually manages to do that ? There's not much information available on this. The more ...
0
votes
1answer
143 views

Foreign MRT.exe?

I was managing my firewall using AVG and I noticed this was allowed: I have north american locale, and sometimes Japanese locality(?), and that is not Japanese. It is getting through my firewall, ...
1
vote
2answers
84 views

How do proxy servers protect their SSL certificates?

Suppose that there is a http proxy server outside the firewall of an organization hosting a web server. All client connections to the web server happen through this proxy. The client negotiates SSL ...
13
votes
3answers
12k views

Should SSL be terminated at a load balancer?

When hosting a cluster of web application servers it’s common to have a reverse proxy (HAProxy, Nginx, F5, etc.) in between the cluster and the public internet to load balance traffic among app ...
1
vote
1answer
590 views

Windows Firewall netsh equivalent of iptables u32 module

I have looked everywhere and I can't seem to find a netsh equivalent of the u32 module for iptables. I want to create a rule to Drop a packet that starts with a specific set of bytes. Similar to: # ...
1
vote
2answers
84 views

How does Network Address Translation (NAT) increase firewall effectiveness

Truth or bald-faced lie: the cheap $50 router you can pick up at your local electronics store for your home broadband Internet connection is actually a pretty effective firewall. Why or why not? How ...
1
vote
5answers
66 views

Firewall rules by URL

is there a solution to create FW rules by URL instead of IP for inbound traffic? For example a.example.com and b.example.com are the same IP on the DNS, but they are different sites, is there a ...
0
votes
1answer
34 views

ESET detected incoming connection to Rundll32

My ESET Smart Security 7 detected incoming connection from an external computer, since Rundll32 can be run by any programs on my computer and I don't know which program is doing this, so I am ...
0
votes
2answers
77 views

Is it not safe to open MySQL's port to the internet?

The consensus on this Server Fault question seems to be that opening port 3306 for MySQL is more dangerous than using an SSH tunnel to access MySQL. I would think that with strong credentials you ...
-3
votes
0answers
68 views

iptables raw table

I'm trying to collect iptables common shield rules, here is my current list: echo "-Check for All flags enabled&Drop." iptables -I INPUT -p tcp --tcp-flags ALL ALL -j DROP echo ...
2
votes
1answer
159 views

Is it safe to disable connection tracking in iptables?

While reading about NOTRACK target of raw table in iptables, I encountered an article suggesting that for certain traffic you could (or even should) disable connection tracking. The two examples were: ...
0
votes
0answers
20 views

How to use the Suricata IDS to monitor the entire network? [migrated]

I have the following 3 PCs connected to a router via Ethernet: PC1 – 192.168.1.101 (Linux Ubuntu) PC2 – 192.168.1.100 (Windows) PC3 – 192.168.1.1 (Windows) All PCs can ping each other. PC1 has ...
3
votes
2answers
1k views

Reverse shell connections

Why are reverse shell connections so popular in the event of a successful intrusion? Many "hacking" videos show this and it is often seen in practice. Would not most servers restrict outgoing ...
0
votes
1answer
96 views

Is a firewall an access control list?

I want to know if a firewall is considered an access control list (ACL). I know there are other types of ACLs, but am specifically interested in knowing if a firewall is an ACL. Edit: It appears ...
0
votes
1answer
102 views

Firewall hole punching [closed]

I'm interested in doing my thesis on Firewall hole punching. Hole Punching: A way to exploit NAT to open a connection TCP or UDP between a Client and a Server. What I'm looking for is a reason this ...
1
vote
2answers
169 views

How to block network scans with pfsense?

I am using pfsense as firewall, and I would like to know how I can stop network scans from enumerating open services and ports. Thanks
4
votes
1answer
75 views

DMZ Firewall settings

I am involved in project where I have to install a new server for a new application to a preexisting production network. The new server shall sit in the DMZ and two controllers will sit on the ...
0
votes
2answers
112 views

Securing a Windows PC

Currently I have an "Antivirus" and Anti Malware software installed. In addition I closed all remote assistance and unused port rules on my firewall. I'd really like to get a complete as possible ...
30
votes
5answers
6k views

Are two firewalls better than one?

Let's say that our first firewall have some vulnerability and malicious person is able to exploit it. If there's second firewall after it, she should be able to stop the attack, right? Also what will ...
0
votes
2answers
206 views

Could a router protect our network or need we use an hardware firewall?

I am at a small firm (12 PC on the internal network). We use this network architecture now: Internet(Modem) --> Router --> Firewall --> Switch -- > Internal Network (clients PCs) ...
0
votes
0answers
24 views

Is it possible to covertly tunnel data using L3DSR? (or any other TCP or IP layer hack)

I asked this question on ServerFault regarding how a Netscaler embeds low level data in a TCP packet, round-trips it, and then uses that data to loadbalance the user. Similar to DNS Tunneling, I ...
30
votes
7answers
19k views

Why do people tell me not to use VLANs for security?

I have a network, where a have a couple of VLANS. There is a firewall between the 2 VLANs. I am using HP Procurve switches and have made sure that switch-to-switch links accept tagged frames only and ...
5
votes
2answers
12k views

What advantages and disadvantages do Palo Alto firewalls have, compared to others in the market

I am about to start an evaluation process for firewalls. I have experience with Checkpoint and Juniper, but I don't have any information on Palo Alto networks, other than their marketing stuff. So I ...
2
votes
3answers
1k views

How to block the websites on client machines

In our office we are blocking sites like Facebook, Twitter etc.The problem is that some of the users bypass our proxy and firewalls through external proxy sites like www.youhide.com or ...
1
vote
2answers
146 views

Do I need a hardware firewall even if I have Internet security software?

I have Kaspersky Internet Security 2010 installed on my Win7 computer. I assume it gives me enough protection for a software firewall(port security,tracking tcp,udp traffic etc.) Do I still need a ...
-1
votes
2answers
252 views

VPN blocked ports problem

I use VPN quite often in public places where I don't want anyone to read my web traffic. However, some public places have firewalls that block ports required to establish a VPN connection (I usually ...
3
votes
4answers
195 views

Find out what Linux software is trying to phone home

I have seen some suspicious outbound communications blocked on my VPS, which hosts a small experimental Web site, and want to find out which application is making the attempt. The server is running ...
1
vote
2answers
140 views

How to prevent attacks to server

I have 3 CentOS server configured for my applications. Recently I recognized that there is so many attacks to my servers. I have so many logs about attempt to login to my servers using sshd from ...
-1
votes
2answers
55 views

Intrusion detection system and firewalling

I have a website and hosted some data and MySQL files on it. Is it possible for me to install an intrusion detection system on it, or can IDSs only be installed on my internal network where I have a ...
1
vote
5answers
127 views

Do firewalls always run in userspace?

There are many Firewall solutions for the world on different operating systems: iptables, pf, ipfw. My question is: Does the firewalls run in kernel-space or all of them runs in user-space? (in ...
43
votes
2answers
20k views

Is it a bad idea for a firewall to block ICMP?

This question was inspired by this answer which states in part: The generic firewall manifest file finishes off by dropping everything I didn't otherwise allow (besides ICMP. Don't turn off ICMP). ...
2
votes
1answer
240 views

How can the Google web crawler bypass portals?

This is a situation that I have encountered on a number of occasions. I will conduct a web search in Google, a link to a file (.pdf for example) will take you to that file on the server. It opens up ...
2
votes
1answer
4k views

How to block all access to Akami deploy servers and Apple push servers?

I no longer blindly trust the numerous connections that occur at night and during the day that always go to "content" and "push" servers like: a23-33-37-54.deploy.akamaitechnologies.com ...
0
votes
0answers
62 views

How should I configure my Tor-dedicated firewall for optimum security?

I'm setting up a Tor-based isolating proxy using the 'Anonymizing Middlebox' iptables rules specified here: https://trac.torproject.org/projects/tor/wiki/doc/TransparentProxy i.e. iptables -t nat ...
1
vote
3answers
345 views

Best practice for accessing management port of firewall

I'm in the process of setting up a bunch of servers at the other end of the world (well, 8 hours travel time) in a co-location place. The servers and firewall all have a remote management port (KVM, ...
0
votes
0answers
28 views

Carry out an attack on port 80 while only 20 is allowed [duplicate]

There is a question bugging me a after reading on network security. Theoretical situation: there is a packet-filtering firewal which only accepts tcp / ip communication with destination port 22 on a ...
18
votes
7answers
3k views

Port Knocking is it a good idea?

Normally for a server I like to lock down SSH and other non-public service to only be accessible by certain IP addresses. However this is not always practical if the business doesn’t have static IP ...
1
vote
2answers
147 views

What security does an ISP provide for its customers?

I've heard that ISPs provide some kind of protection; using NAT and firewalls, to prevent hackers from using tools such as nmap to attack customers from over the Internet. What other technologies are ...
1
vote
4answers
20k views

How to effectivily block torrents on my network?

Hie, As per my network policy, we have to block all torrent traffic from network. To do this, I used to block all ports above 1024 on my firewall/proxy devices. But due to this, many other ...