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2
votes
2answers
168 views

Practical ways to prevent Denial Of Service attacks

I am an undergraduate Computer Science student and was hoping to gain some knowledge of ways to help prevent Denial Of Service attacks.I read about some of here: ...
0
votes
3answers
65 views

Simple explanation of Port Knocking

I was just referring to this article: http://en.wikipedia.org/wiki/Port_knocking The term Port Knocking, as explained here, was slightly confusing and I was feeling difficulty in getting the hang of ...
0
votes
1answer
118 views

Two-factor port-knocking via SMS (TXT)

It seems to me that a useful alternative or supplement to traditional port-knocking, fwknop, etc, for a system requiring only occasional access, would be to: Set up a one-time pad of keys, and a ...
2
votes
2answers
131 views

Hide logging server from DMZ

I have a server on my DMZ whichs relays syslog and OcsInventory messages to a server on a vlan for logging servers. In order to allow the packets to go through I must allow port 80 (OcsInventory) and ...
4
votes
1answer
75 views

Securing an IMAP service

I need to secure an IMAP service running on dovecot. Which wrapping layers of security can I enhance security with? I am using most of the built-in dovecot-specific security features, like ...
1
vote
1answer
225 views

Steganography using all TCP/UDP ports?

I just had an idea, and usually when I come up with one, it turns out it was already invented, so... Is there some standard that would consist of multiple parties sniffing on all of their TCP/UDP ...
2
votes
1answer
1k views

How does knockd work?

It's rather easy to configure knockd for ex.: on an Ubuntu server's (10.04) sshd: ======================================================================== 0) # install knockd on the SERVER side ...
1
vote
3answers
673 views

Bibliography of attacks by port scanning techniques

I have to present a paper and make a presentation about the principal types of attacks by port scanning. What literature do you recommend to cover enough information about: types of attacks, port ...
5
votes
4answers
167 views

software to keep a list of IP that try to access ssh over a set of rules and feasibility

i'm interested in software or set of scripts to keep a lists of filtered IP that attempt to brute-force ssh, and to label an IP as brute-forcing i would add some checks like: one attempt to log as ...
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 ...