Concerned with software or hardware firewalls

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2
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0answers
21 views

cisco asa syn flood detection and response not working

I have a Cisco ASA 5510 (ASA Version 8.3(2)) that has been getting a syn flood attack on it (or more accurately through it - targeting a host behind it) a couple of times a day for the past few days. ...
0
votes
3answers
38 views

Confusion over a firewall and proxy

A proxy usually controls HTTP(S) traffic going outbound. IE it can be blocked, and so forth. How is this different to a firewall working on port 80/443? Also, if a firewall is to control outbound ...
0
votes
1answer
87 views

How does the Dell Sonic wall Authentication works?

My College Router has Dell Sonicwall authentication. We will be automatically redirected to the login page. If the username and password is correct a new popup opens showing that user 'x' has logged ...
1
vote
1answer
21 views

Is there a trusted independent firewall review company?

I don't know how to write this without it sounding like a plug (lol), but it's not. So please don't close-vote it, even if you really want your editor badge. Here goes: There's this site called ...
0
votes
3answers
98 views

Why do we need IDS/IPS if a firewall is present?

Why do we need IDS/IPS if a firewall is present?
0
votes
0answers
7 views

Sonicwall GAV / DPI between VPNs [migrated]

We have multiple remote sites connected via VPN to a central site that uses a Sonicwall NSA 250 (running SonicOS Enhanced 5.8.1.15-51o). I'd like to allow the remote sites to talk to each other by ...
1
vote
0answers
23 views

Configure icefloor to prevent leaks when VPN connected

I am trying to configure icefloor firewall on OS X 10.9 so as to make sure all traffic will go through VPN. I recently notified that even with "Route all traffic through vpn" option in tunnelblick ...
1
vote
0answers
33 views

How can I make my computer trust a firewall web server certificate? [migrated]

Every time I log into my firewall I get a message that says: The site's security certificate is not trusted! I know this is because my firewall doesn't have an identity certificate from a ...
1
vote
1answer
41 views

Based on which criteria is this outbound traffic being blocked? Only HTTP passes, on any TCP port?

There is a server program running behind a home ADSL modem/router, at a premise that I'll call C; the program listens on TCP port 29401, and accepts connections using a custom binary, non-HTTP, ...
0
votes
1answer
54 views

Firewall log entry: need help in interpretation

I recently setup an Hardware UTM Firewall. The firewall log shows the this entry every 20 seconds: /var/log/packetfilter/2014/09/packetfilter-2014-09-30.log.gz:2014:09:30-12:06:15 utm ulogd[11342]: ...
1
vote
1answer
22 views

How can I implement a whitelist based on packet content?

At the moment I am looking for some way on Linux to have packetfilter whitelisting done but based on finegrained parameters such as packet content rather than more general parameters such as protocol ...
0
votes
1answer
33 views

HIDS that can detect attacks, take immediate action locally, and then report to a central service for re-broadcasting to other systems?

I've been researching this for a bit now and cannot find what I want. So I'm to the point where I'm weighing my options as to how I can proceed. Background I'd like to setup a HIDS that has the ...
1
vote
1answer
439 views

Has Palo Alto firewalls released perimeter protection for the vulnerability in the Bash shell utility?

im wondering if palo alto firewalls have released perimeter protection for the bash shell vulnerability.
2
votes
1answer
35 views

Virtualisation: security on the host side

Virtualised environments are focused on isolating the guest OS. Using the VirtualBox model, the guest might be behind a virtual NAT and/or talk only with other VMs via internal networks, and only ...
1
vote
1answer
28 views

Security implications of packets with an invalid state (iptables)

I have been seeing few rules with -m state --state NEW, ESTABLISHED, RELATED. First I thought that was pointless as it was contemplating the three possible states, so there was no need to define -m ...
1
vote
2answers
55 views

Why the Websense blocks same site when used with http & not when used https? [closed]

I have been working in a IT firm. I have access to some social sites. When I try to open site Links in mail (that are having http://), the websense prompts me that the access is blocked. However, when ...
2
votes
2answers
120 views

How common is port-knocking? [closed]

Today I read about port-knocking for the first time. It has been a pretty known concept for more than ten years, but I don't know anybody who uses it for their servers. How common is the usage of ...
2
votes
1answer
48 views

Should reverse connections be used to bypass NATs?

I'm planning on doing a demonstration on how remote administrative tools work for my schools computer security club. I plan on writing a RAT in C++ and demonstrating/explaining how it works. I ran ...
0
votes
0answers
16 views

Which IPTables chains should I log from a security perspective

So far I've always been logging the INPUT and OUTPUT chains because I only used iptables as host firewall. Now I'm configuring network firewall which uses iptables, but I don't know whether I should ...
0
votes
1answer
65 views

Creating a secure home network - Which firm ware should I use and how should I configure my firewall?

I am starting to take on more and more enterprise clients while working remotely from my home office. I have a pretty secure network at the moment, but I have a lot hardware that I am not using and ...
0
votes
2answers
132 views

Trying to get rid of hackers who have access to all my devices

What is the best way to go about getting rid of hackers that have gained access to all my personal computers, (both old and recently purchased) phones, and even random computers I use to simply get ...
2
votes
1answer
56 views

How do you back up cardholder data remotely without a network connection?

In the PCI DSS version 3 it says: 1.3.3 Do not allow any direct connections inbound or outbound for traffic between the Internet and the cardholder data environment. But in the event of hard ...
0
votes
1answer
52 views

Web browser initiating connection on non-standard ports. Should it be blocked?

I am doing some egress monitoring on my computer. Once in every few days, I would find some strange connections being logged, which I believe is initiated by the web browser through a related but not ...
1
vote
1answer
36 views

How to check whether firewall allows traffic on specific port but not listening on the port [closed]

I have client / server and there is a firewall between them.The server is listening on a port and I want to check if this port is allowed by the firewall. I can only know the ports that the machine ...
-4
votes
1answer
83 views

What are the ways to block all BitTorrent clients from accessing my router? [closed]

What are all the values need to be entered in the source and destination IP address and Subnet mask in order to block the bit torrent file exchange.. i.e. blocking torrenting My router's filtering ...
1
vote
2answers
151 views

Which encryption technique should be used for cloud computing data transfer?

I want to setup my application for cloud computing for Software as a Service. There is going to be a lot of data transfer between my server and client, to and fro. The technique I have envisaged is: ...
3
votes
3answers
195 views

Can firewalls get affected by the traffic they process

Does such attack exist? Forgive my wild imagination but is it possible for a hacker to pretend/try to communicate with a service on the server and when the firewall examines the traffic it get's ...
2
votes
1answer
225 views

Docker port forwarding exposure

I try docker with a simple webapp : docker run -d -v $(pwd):/app -p 8080:80 image_name I have docker listen on 8080: tcp6 0 0 :::8080 :::* LISTEN ...
1
vote
1answer
66 views

Is it possible to track the email sent via BCC List using firewall or network security software?

I want to know whether is it possible to know the conversation/email sent via BCC can be identified by admin in some corporate companies? I have heard that email sent from BCC cannot be identified, ...
0
votes
1answer
118 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 ...
0
votes
1answer
31 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
1
vote
2answers
146 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 ...
1
vote
5answers
99 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
2answers
190 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 ...
1
vote
2answers
101 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 ...
2
votes
1answer
692 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
1answer
120 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 ...
2
votes
2answers
553 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
91 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
123 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 ...
0
votes
0answers
33 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 ...
31
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
1answer
50 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
1answer
125 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
190 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
1k 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 ...
1
vote
2answers
304 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
60 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
164 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 ...
2
votes
1answer
290 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 ...