Concerned with software or hardware firewalls

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2
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1answer
45 views

How To Find Out What 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 am wanting to find out which application is making the attempt. The server is ...
0
votes
1answer
80 views

Would encryption bypass some firewall rules?

Would an encrypted connection be able to bypass a firewall? A firewall is working on layer 1-4 of OSI model, the encryption and decryption is done in presentation layer (layer 7 of the OSI model). Can ...
0
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3answers
30 views

How source port field in firewall rule is used

Some firewalls (like the first figure in 13.1.4 in http://doc.m0n0.ch/handbook/examples.html) allow user to specify source port in a firewall rules. But in a TCP connection, the source port is ...
1
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3answers
116 views

hardware firewall placement

In a home office environment with cable internet, can a hardware firewall be placed in front of/upstream from a cable modem to also protect the modem from tampering by the isp or a hacker?
1
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1answer
67 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 ...
0
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0answers
24 views

Firewall best practice

I have to implement a firewall on a Mikrotik RouterBoard. What is a good way to do it? Here is my plan: Note: We are using an OpenVPN (bridge mode) server, a DHCP server, a PPPOE client, and an NTP ...
2
votes
1answer
55 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 ...
0
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2answers
66 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) ...
1
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0answers
82 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: # ...
2
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1answer
38 views

Blocking incoming traffic from privileged port (< 1024) to mitigate DNS DDos Amplification attacks

Hope someone can clarify. As I understand, in a DNS DDos Amplification attacks Multiple DNS queries are sent to a vulnerable name server with the source IP spoofed to that of the target server. The ...
16
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12answers
21k 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 ...
0
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1answer
55 views

Sky Broadband Shield

I was just wondering the implication's to Sky's new revelation of a so called 'shield'. Is this actually even a security feature or just a advertisement stunt for Captain America. I can find very ...
2
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1answer
3k 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
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1answer
83 views

Dual Firewall DMZ

We've just learnt about firewalls and DMZ and I'm struggling to understand how are these actually implemented ? The architecture we've learned was something like this: Let's say that we have a ...
4
votes
3answers
200 views

Can a web server be secured with just a firewall?

I'm about to go online with my first web site, it is a small project hosted on a regular home PC running Windows 7. I want to keep the software footprint at minimum, so it only contains the operating ...
-1
votes
0answers
20 views

ACL implementation help

So I have network that looks like this: isp ->192.168.24.x - pix ^regional network(172.16.254.x)10.9.8.1 -> 10.9.8.254 asa -> local (172.16.1.x). So basically the pix has three interfaces, one ...
1
vote
1answer
133 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 ...
10
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5answers
1k views

What firewall settings on a Macintosh are the most restrictive, while still permitting casual internet use?

I don't want this to be subjective, so I'll try to make the requirements as clear as possible. On a Mac with Snow Leopard, how can I set up the firewall rulesets that allow ONLY: Using the internet ...
1
vote
2answers
49 views

Is rolling my own firewall on top of my normal firewall dangerous?

I'm thinking about playing with/learning about firewalls. It is easier for me to learn by building, so why not build a firewall? If I run it alongside my normal firewall, I'd get the normal ...
1
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0answers
21 views

API deployment infrastructure

We are going to deploy our service, it's drupal based with some additional REST APIs. The drupal servers will be (loadbalanced) put in the DMZ. We think to deploy the REST APIs on an app server in ...
1
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4answers
106 views

Comprehensive audit of firewall - is Internet truly not accessible?

We have many Linux servers in several co-locations over the world. By design, these machines generally should not be able to access the Internet. Depending on location and role, some sites may have ...
0
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1answer
63 views

Is it a bad idea to use port forwarding as a long-term access strategy?

We are deploying multiple copies of the same system (some devices behind a gateway with NAT), and we need to have continued access for some of those devices. Right now our strategy is to have a set of ...
2
votes
1answer
79 views

Windows: Any method to enforce user confirmation before the browser opens a URL requested by an external desktop app?

A robust outgoing firewall will protect against desktop applications directly connecting to the internet without your permission. However, as the browser is a generally authorized application for ...
6
votes
3answers
352 views

Firewall says that a program that I'm developing is trying to connect to the Internet

I'm seriously confused about this, since the program is entirely developed by myself and has no means/functionality to connect to any network/the internet whatsoever. I'm a software engineer but not ...
1
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2answers
63 views

SSH Security allowing only certain users to connect to the server [closed]

I have set up a remote ssh server on the cloud. I am newb at these things and have managed to bypass the required firewall using SSH. Now I plan on giving the access to only 2 more friends of mine so ...
2
votes
1answer
95 views

IPS/IDS and Firewall Solution(s) to a Small Office

I was tasked with implementing a network security solution for a small real estate agency. They are a typical old-school mom and pops shop, about 15 employees with basic file sharing, printing, and ...
0
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4answers
97 views

How to secure my website's FTP?

When I opened ftp command prompt and typed open mydomain.com, it gave me the following and I think that this is a security vulnerable. connected to mydomain.com. 220----- Welcome to Pure-FTPd ...
0
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2answers
111 views

Should I restrict Core Networking firewall rules in Windows server?

I have a server that I want to restrict access to by allowing only one IP address to be able to connect to it through desktop and make http request through port 80. Now in my firewall I only have ...
0
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1answer
56 views

Application Server <-> Database Firewall [closed]

What threats can a firewall between an application server and a database server mitigate that would not otherwise be mitigated when both the database server and application server are behind the same ...
1
vote
1answer
126 views

Do I need logging enabled in my rules in IPFW for sshguard-ipfw to work/blacklist ip's?

From the FreeBSD handbook: Even with the logging facility enabled, IPFW will not generate any rule logging on its own. The firewall administrator decides which rules in the ruleset will be ...
1
vote
0answers
87 views

Proxy via pfSense and exclusions for DNS

I have posted this to NetworkEngineering.SE, as that seems the more suitable audience for this question. I will leave this question open here but am happy to see it closed. I just did not want to ...
2
votes
3answers
6k views

Config Server Firewall: What Outgoing ports need to be open for wget and apt-get install?

I am just configuring CSF and I have to specify my outbound ports here. I am trying to close as many as possible leaving only what I need open, however what do I need to leave open for wget? # Allow ...
9
votes
4answers
664 views

A firewall without any extra features [closed]

I have Kaspersky Internet Security (KIS) installed on my system. I always keep it disabled, yet using a few practices, I kept my system virus free for years: I disabled autorun using these tricks; I ...
1
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3answers
92 views

Make firewall management public?

A friend of mine installed a new firewall software at his company. Sometimes he works from home, and also has to maintain the firewall. The firewall management software is a web site. My friend made ...
5
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3answers
1k views

Is it necessary to setup a firewall in both PC and router?

If I have the router firewall enabled, is it really necessary to setup iptables in my system? Isn't it a little redundant? For example I add a rule in the router where the PC can't use the port ...
2
votes
3answers
325 views

iptables: plaintext password protection

I'd like to find a way to block or restrict my access to the web-pages where my password is sent as a plaintext on the internet. Let's assume if I have the same password for all web-pages, is it ...
2
votes
4answers
3k views

What is the difference between antivirus and firewalls

I need a brief explanation about the differences between antiviruses and firewalls
0
votes
1answer
110 views

Can a firewall blocking a guest virtual machine secure the host?

I have searched up whether a host is safe from its guest, and generally, it is said that, aside from vendor security flaws, a guest that is infected can infect the host over a shared network. So, ...
12
votes
5answers
6k views

What is the best practice for placing DataBase servers in secure network topologies

I have a classic DMZ architecture: My webserver is placed in the DMZ. The webserver needs to communicate with a database server. This database server is the most critical component of my network ...
0
votes
1answer
330 views

What is the difference between SYN cookie, SYN cache, and SYN proxy?

I am trying to understand some techniques regarding SYN flood prevention and there are three terms I couldn't find a clear explanation of. The terms that are confusing me are: SYN Proxy SYN Cache ...
6
votes
2answers
46k views

What are the TCP/UDP ports used by torrent applications?

I want to block torrent traffic on my network because it is utilizing too much bandwidth and disrupted my network traffic. What port range should I use and what protocol TCP or UDP?
6
votes
5answers
877 views

Firewall demo - iptables

I have to make a demonstration about firewalls in my class as a student(university). It should be implemented using iptables on Linux. I am reading all the theories around them but I can't figure out ...
-2
votes
1answer
153 views

How can I protect files on my personal home PC for when it is connected to my employers network via VPN? [duplicate]

I think my employer uses Citrix product to supply VPN. I have files in My Documents folder on my home PC that I would not want my employer to be able to access when I am connected over their VPN. I am ...
3
votes
1answer
207 views

Blacklisting during a penetration test?

So i had a debate recently where one of my colleagues believed that by launching a penetration test (one requested by our clients) from our one of our IP's we could potentially get that IP/all IP's in ...
7
votes
2answers
883 views

Kerberos authentication over the public internet

What are the threats to having the KDC accessible via the internet for remote clients? It's my understanding that the authentication is a challenge/response protocol and that the password is never ...
1
vote
3answers
235 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 colocation place. The servers and firewall all have a remote management port (KVM, ...
1
vote
2answers
276 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 ...
3
votes
1answer
81 views

Tracking down the source of email attacks

For the past week our company's IDS has been blocking 100-200 meeting invite emails per day from a specific client that are loaded with buffer overflows targeted at Exchange 2003. The payloads are ...
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0answers
117 views

Bypass Nmap Scans Being Blocked [closed]

A friend has set up a VM for me to play with, I am currently stuck on a little problem: On this network he set up, there are 6 machines and a router, 5 servers (plus the router) show up on a typical ...
0
votes
1answer
137 views

How does a website get pass my server firewall and attempt to hotlink to my server resources?

I was stumped when I saw the following lines on my Apache server error log this morning: [authz_core:error] [client ::1:37317] AH01630: client denied by server configuration: ...