Questions tagged [network]

Security of network infrastructure and network traffic. For questions about security of network equipment, topology, protocols, traffic, administration, and configuration. Related tags: [packet], [firewall], [network-scanners], [network-access-control].

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5
votes
1answer
2k views

Firewall rules to block unwanted protocols on given ports

Does somebody has an idea, that what kind of iptables/pf rule must i use to achieve this?: i only want to allow these connections [on the output chain]: on port 53 output only allow udp - dns on ...
12
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3answers
746 views

Verifying server software integrity?

I'm trying to brainstorm a security scheme for the problem of verifying server software integrity. The domain of this problem is Game Servers built on Valve's Source Dedicated Servers. These servers ...
3
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1answer
430 views

Checkpoint NGX IPS & NAT

how does CheckPoint R65/R70 handle IPS violations of outbound traffic from hosts that are NAT'ed? Is it necessary to include the NAT'ed IP in the exceptions list or is it sufficient to include the ...
1
vote
1answer
394 views

Wireless Access Point security with TEW-638APB

We have a large network that is private, with both eithernet and Wifi access. We'd like to make another smaller network that is wireless, open, and possibly throttled, and not able to access our ...
11
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3answers
2k views

What free tools or techniques exist to discover anomalies in network flows?

I have been using FlowMatrix. What do others do on the cheap?
1
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2answers
507 views

is there any solution to manage network forensic, SIEM and intelligence analysis and investigation in a enterprise network?

Anyone have experience in a solution to manage in an integrated view this functionality ? - network forensic - SIEM - intelligence analysis and investigation Like Niksun or Solera solution do ? I'm ...
8
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2answers
390 views

What is secure enough for web applications?

we intend to build a network in a small health center with No Internet Access it is expected to have 30 terminal machines, all machines will use an electronic medical record web application we want ...
1
vote
1answer
261 views

What is your experience with AlertLogic?

Do you have any insight, or experience (good or bad) regarding AlertLogic? In what areas can they improve, what areas are they lagging in?
14
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7answers
713 views

UNIX Servers: Possible intrusions or attacks that do not use any of the open listen sockets

What type of attacks are there that do not use open TCP or open UDP ports? Is it safe to assume that no open ports means no remote access? (Excluding the possibility that there is a badware already ...
15
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3answers
1k views

Are there valid reasons for spoofing an address?

This is a corollary to the question Why don't ISPs filter on source address to prevent spoofing?. Are there valid reasons to spoof an address?
17
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4answers
2k views

Network Forensics - what is in your toolbox

In similar vein to this question on computer forensics, what tools would you have in your toolbox for infrastructure and network forensics. Typical example cases would be if you were called in either ...
2
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1answer
1k views

I'm using a Cisco ASA as a VPN endpoint. Where do the VPN clients get firewalled?

(Is this too application specific? It seems like a reasonable question that would be useful to other people...) So, I've got this ASA in front of a network that I didn't set up. It's been ...
5
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1answer
4k views

Is L2TP as secure as IPSEC for VPNs?

Is it as secure to use L2TP for VPN access, rather than IPSEC? Am I introducing any risks by using L2TP?
11
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4answers
1k views

What is the risk of a packet being sniffed when travelling over the internet without SSL/TLS?

We all know to use SSL/TLS to stop people eavesdropping on our connection, but how likely is it that an attacker will actually sniff your unencrypted password or cookie if you don't? If we exclude ...
10
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2answers
2k views

Malware known to use port knocking to evade detection by network scanners?

Are there any known cases of malware in the wild that utilize port knocking on a backdoor to evade detection by network scanners?
12
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2answers
1k views

What is a “pre-play” attack?

I understand what a replay attack is, but I keep reading about a pre-play attack. What is it? Is it when someone intercepts an unused message and blocks the sender so they can't finish using it, and ...
7
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2answers
1k views

What is your approach to handling Guest Internet access?

Suppose you're a company that uses a web proxy to block objectionable content on your corporate network, and this technology may cause issues with some 3rd party VPNs. Or perhaps this 3rd party is ...
5
votes
2answers
282 views

What risk do International Domain Names (IDN) pose?

I understand that IDN's are basically a GUI display change for domains that have a prefix of "xn--". What should I advise companies do in regards to these domains? For example, should companies ...
19
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1answer
6k views

SFTP, FTPS and SecureFTP differences and security implications

What are the basic differences and security implications of using SFTP, FTPS and SecureFTP.
10
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2answers
3k views

How do the root servers get updated with my name server? Is WhoIS information always in sync with the root?

I've never understood what happens behind the scenes when I go to my registrar and enter in my name server's information. Can someone elaborate on what happens when an update is made, and how it is ...
3
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2answers
178 views

When would you support the storage of Security & Application event logs in the Cloud?

Under what conditions would you be comfortable storing server log data residing in a secure facility, off-premises? When would you consider a SaaS /hosted solution and what value add should that ...
11
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2answers
2k views

Online SQL Server database for a Business app. Security considerations

A business application works with a SQL Server database. A SQL Server 2008 is installed on one of the computers of the local network. Technically this app works OK if the server computer with the SQL ...