Network Security - securing network infrastructure and connections

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1answer
83 views

Why do I get all of these bad header checksum messages?

Every time I open my browser, I get tons of these bad header reports. What does this stem from?
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3answers
287 views

Suspicious VMWare connections that bypass firewall

I'm running VMWare 5 and I have found that when I start up VMWare I see two connections: TCP 10.100.100.161:55555->as-40816.engx.vmware.com:https (ESTABLISHED) TCP ...
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4answers
386 views

Can Your ISP use a Packet Sniffer? [closed]

Can ISPs presumably use packet sniffing applications such as wireshark and monitor my unencrypted data? Are they "allowed" to do so?
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2answers
349 views

Using only a firewall, how do I protect a database server from be exposed?

If I had two firewalls, I could put a web server within a DMZ and then with the second firewall restrict the access to the DB server. However, If I only have one firewall, how could I accomplish ...
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1answer
450 views

What utilities can be used for Ping of death attack?

Can somebody tell me what program can mess with pockets and enlarge them for Ping of death attack? (i need it for lab) Is there anywhere step-by-step instructions of this attack? I'm not a hacker ...
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2answers
1k views

How do worms spread over LAN? [duplicate]

I've been researching LAN recently, and I came across a post talking about viruses spreading over LAN, and I was wondering, how is this possible? Would it not be a huge security issue to allow files ...
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4answers
869 views

Security provided through MAC filtering: Wired vs. Wireless Networks

My question refers to the following article on Wikipedia: MAC Filtering. The article states: MAC filtering is not effective control in wireless network as attackers can eavesdrop on wireless ...
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2answers
612 views

Could my computer be infiltrated if someone knows my external IP? [closed]

Could my computer be compromised if someone knew my external IP? I know that when you type that in it just goes into the router page, but my computer is connected to said router. If so, what is the ...
2
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1answer
128 views

Security implications for two applications communicating with TCP/IP on localhost

Considering this for the local loopback connection: - It is implemented entirely within the operating system's networking software and passes no packets to any network interface controller. If ...
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2answers
364 views

Is it possible to detect when a device has been MAC filtered on a Wi-Fi network?

Is it possible to detect when a device has been MAC filtered on a Wi-Fi network? I don't know if it's in the 802.11 standard, or if it's just implemented by ignoring the client network packets.
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1answer
1k views

Cable modem/router hidden internal ISP network?

I was querying my router(Thomson TCW750-4) over the SNMP and stumbled upon some interesting information. I see that the router actually has five separate network configurations operational: ...
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2answers
137 views

Is it possible to assign MAC-address-specific passphrases for a WiFi network?

Private network access security can be defined by a unique WPA2 passphrase to grant access to devices and MAC address filtering to control authorized devices. Nowadays mobile devices are legion, so if ...
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1answer
195 views

What can't a packet sniffer troubleshoot [closed]

This might seem like a really vague question however I am studying a networking course. One of the many aspects requires the use of a packet sniffer software - in this case I chose Wireshark, which I ...
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3answers
1k views

What are the main differences between the network-level and the application-level regarding information security?

I'm fresh new to the field of security, so I'm sorry if this question seems stupid to you. What are the main differences between the network-level and the application-level regarding information ...
3
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1answer
347 views

How is a Tor hidden service immune to exit node attacks?

Let me explain with a nifty diagram: IP/RP <-> bunch of Tor clients/node (Tor circuit) <-> Tor hidden service Wouldn't the last Tor client in the circuit knows that the message is for the Tor ...
6
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3answers
4k views

with IPv6 do we need to use NAT any more ?

I'm wondering how to use NAT with IPv6 ...seems that you don't even need it any more. So what exactly is the concept behind firewall configurations in IPv6 environments?
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1answer
179 views

SIEM v/s Network Forensic

when SIEM is already implemented in a enterprise network; does it not do all tasks and report like network forensic investigation? Or can we do away with SIEM and have only Network Forensic tools ...
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1answer
229 views

Disabling Ping/ICMP Requests [duplicate]

Are there any benefits from disabling Ping/ICMP requests on servers? I've read where people say to do it but I can't seem to find any real benefits with it. Only more likely to cause more problems. ...
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2answers
469 views

What order is best for nesting VPNs?

if anyone is available to give me advice on a VPN situation I'd appreciate it. So the story is, I have one Swedish VPN which I trust not to log, and which I've connected to with my real IP, and I've ...
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2answers
156 views

Does this show the need for a two-factor authentication?

I need some help for my understanding while reading through this authentication scheme in WEP. In a WEP authentication scheme, the station first sends a request for authentication. However, this ...
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1answer
1k views

How to secure my network, laptop, ipad and email accounts which are possibly hacked?

Background Last month I noticed lots of failed emails in my inbox and after few minutes I lost my access to my Yahoo Mail. My friends informed me that they have received spam emails from me. So I ...
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3answers
304 views

Remote IP scan detected

I would appreciate if you take some time to go over issue I am facing. On my laptop I have windows 7 installed, I am using ESET Smart Security 5.2.9.1. As I work 9 hours day online I am seeing a ...
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1answer
754 views

Open source video conferencing software with encryption [closed]

A couple of friends and I are looking for an open source video conferencing software. We'd like to run the server on a Debian box, but the clients are Windows machines. Most importantly, it should ...
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1answer
102 views

Benefit of having strict ACLs [closed]

My company uses strict ACLs for the connection between two boxes. What are the benefits of these?
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1answer
83 views

Set Gateway for our LAN

I am new to Networking. In our organization we try to setup gateway for security purpose so that we can block certain harmful websites. All I know is gateway is a device. What we have is the LAN ...
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1answer
130 views

TCP IN connection from another user in my home network. Is it safe?

I'm using Comodo Firewall and I noticed that sometimes I'm getting TCP IN connection from another IP address in my home network (only one router and few wireless users): TCP IN | 192.168.1.50 | ...
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2answers
259 views

Isolating host machine from external network

How to prevent a host machine from sending/receiving packets with the following network configuration: eth0 - physical NIC :: not configured; tun0 - virtual NIC for VM which role is the gateway for ...
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1answer
344 views

Is the system bios and network card protected by the OS firewall?

My question arises from trying to understand new types of spyware that target the system bios and/or network card. Is the system bios and ethernet card both protected by an OS firewall set to deny ...
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1answer
229 views

What are the security concerns when connecting to a WiFi network? [duplicate]

I connected my phone to a protected Wifi network that is not my own. Can anyone accessing the same network be considered a threat on my mobile device? Is it easier for hackers connected to the same ...
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3answers
492 views

Should a hostname ever be considered a secret?

I've been told in the past that you should never give out the host names of computers on your network. I can't think of any reason why this would be the case. Could someone tell me if they should be ...
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1answer
121 views

SSL on domain will affect un-secured sub-domain

I have a plan to buy a SSL certificate for my domain. I don't have much budget so I decided to buy standard SSL with no support for sub-domains. I have a WCF web-service that works on sub-domain. This ...
2
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1answer
139 views

Danger of peer to peer software [closed]

I wanted to ask what are the risks of using P2P software. I found a lot of information on-line regarding the danger of file sharing but not about the software by itself. I am writing a mobile ...
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1answer
300 views

Limit BitTorrent Sync connections to a specific network

Is it possible to limit BitTorrent Sync connections to a a specific network using the client software? Right now the closest I can come up with would be IP limitations imposed on each client using a ...
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3answers
169 views

Trace wireless connections in airplane mode

I was wondering if turning on Airplane Mode really disables all wireless connections. If so, anything you do on the phone locally can not be traced, seen, or viewed, hacked, etc. by anyone over a ...
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1answer
259 views

Sending a skype message by ip or mac addresses [closed]

If I know someone's ip, mac addresses and a computer name in a local wifi network, and also that there is skype running on their computer (and port), can send them a message through skype? Can I find ...
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1answer
65 views

How to modify data sending by application to the server?

Let's suppose that I have a simple application which is sending data to the server (placed not in my network), for example 0 1 2 3 4 5 (explicit data) in one second delay between each other. Is it ...
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3answers
428 views

China CCTV System UDP protocol isn't working

My boss is trying to invest on a CCTV solution that he orders from China, his idea is to market it here after we fine tune the process and configuration and make a few tweaks of our own. It consists ...
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2answers
256 views

Using a virtual machine as a buffer between USB media and OS

I was directed here from the Unix & Linux site. I've gone through some of the related questions, but they seem to be more concerned about whether a guest OS can access the host OS in someway. ...
3
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1answer
367 views

Is it possible to detect host-machine of my virtual-machines?

So basically I need to know is there any way to find a connection (or relation) between packets sent by my VMs and my host machine. In my lab I have lots of workstations, each running a VirtualBox ...
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1answer
362 views

Hide a machine on LAN [closed]

Is there any way to hide a computer on LAN? For example maybe with a firewall, when someone is going to ping a machine, it won't answer. In other words the machine must answer to router only. I am ...
2
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3answers
2k views

Alternative to AirPcap for Linux?

I need to sniff WiFi packets, but according to AirPcap FAQ page, it just supports Microsoft Windows, not other platforms. Does any alternative of this product work in Linux? Please don't offer Alfa ...
1
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1answer
191 views

Security w/ Router Behind a Router?

I have a SMB (small-to-medium-business) router (router x) that my workstations run off of in my small business. I wanted to offer my customers wireless internet while they wait for service so I ...
2
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5answers
1k views

SYN flooding attack causing high CPU on hardware firewall

I have a ZyWall USG 200 firewall. A few days ago there was a SYN flooding attack on it causing 100% CPU load. After investigating it turns out this was attack from a single IP address and while the ...
0
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1answer
223 views

Can you sniff broadband connections? And how you secure that?

I know that you can sniff data which is transferred over wifi. Can you do that with broadband (wired)? And how can you secure the network, so nobody could sniff data both over wifi, and broadband?
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1answer
2k views

Google Chrome is keylogger? [closed]

Hi i am a little bit worried that Google Chrome is logging my keystroke. One time ago i had situation with chrome that when i clicked some where in input box he was writting key by key(even backspace) ...
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2answers
208 views

What kind of Wi-Fi security protocol does not use encryption?

I need to sniff HTTP packet over the WiFi network. What kind of WiFi security protocol does not use encryption? I mean if I capture the WiFi packets, no effort required to decrypt wireless packets and ...
2
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2answers
601 views

Running arp command on public wifi network

I accidentally ran this arp -a on a public wifi network(because it is in my terminal history). I killed the process almost immediately. I want to know if this would raise an alert for the network ...
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4answers
18k 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 ...
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3answers
135 views

Can a computer's contents be downloaded wirelessly?

So my calculus teacher, who also teaches computer science, claims that a computer's entire filesystem can be downloaded wirelessly by anyone on the same network? As a Ruby on Rails professional, ...
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1answer
121 views

What are the hardwares used to protect against a DDoS attack on Network layer

What hardware is used to prevent a DDoS attack on a network layer? This question is for my project which I am doing. I have a game server and I need to simulate an attack - an SYN flood. So what ...