Transmission Control Protocol (TCP) is a transport layer protocol that provides a connection-oriented data stream service with guaranteed, in-order delivery.

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Random SYN_SENT connections to Amazon EC2?

I have looked around but couldn't find anyone else with this issue. On my console (standard asus i7 laptop) running Ubuntu 14.04 LTS - I noticed in tcptrack that there are a lot of connections being ...
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Security risk of opening port 111 (rpcbind)?

As far as I understood rpcbind is used for listing active services, and telling the requesting client where to send the RPC request. If a host listens on port 111, one can use rpcinfo to get program ...
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Connecting to postgres with SSL

I need help understanding some basics about the postgres database server and SSL. I am developing a Windows desktop application that will connect to a postgres database, in single user mode, with both ...
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The simplest way to emulate TCP-IP protocol violation / anomaly attacks

Reading up upon security on web applications I did not found that much info on TCP-IP and in particular HTTP/UDP protocol violation / anomaly attacks. My question: What is the general mechanism of ...
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OSSEC, what is it telling me about port changes?

I've been diving into OSSEC for the last couple of months, but I feel unclear on one of it's alerts. I've provided the alert below. The main difference I see in previous output and current output is ...
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How to simulate an UDP / TCP / Multiple Ports via Honeyd daemon?

I am using honeyd daemon to simulate TCP port on a Linux Ubuntu machine using honeyd.conf file which was configured to do so with the following script :- 1 create default 2 set default personality ...
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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 ...
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How to route RST injections

Lots of security appliances and software support RST injection. Plenty of material exists on the algorithmics of the RST packet(s) (making them fit the context of the targeted TCP connection, ...