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3
votes
1answer
37 views

How do I configure Docker containers to have unique IP addresses that are not the default ones?

How do I configure Docker containers to have unique IP addresses that are not the default ones? The Docker containers will run Apache or some web service. These Docker containers will share one host ...
1
vote
0answers
52 views

Why my server cannot serve more than 400 concurrent connections

I have an Ubuntu 14.04 LTS, kernel 3.13 in a Intel Xeon + 8Gb box. It has apache 2.4.7 configured in mpm worker with up to 4000 workers. The max bandwidth allowed by the ISP is 100Mbps. If I test ...
1
vote
2answers
307 views

ICMP : Port unreachable error even if port is open

I am testing my Debian Server with some Nmap port Scanning. My Debian is a Virtual Machine running on a bridged connection. Classic port scanning using TCP SYN request works fine and detects port 80 ...
1
vote
0answers
50 views

TCP/IP routes when using multiple DHCP servers

I have connected a computer (running Debian Wheezy) to two different DHCP servers (routers) through a cable and through a wifi device. If I look at the routes with route, I get the following result ...
0
votes
3answers
88 views

Unable to figure out how to route a packet through a multi-homed nic

The environment is FreeBSD for the most part and looks like this: HOST_A <-> ROUTER <-> LOKI <-> HOST_B Minimally, I would like to be able to ping ROUTER from HOST_B. ROUTER is ...
0
votes
1answer
443 views

How can I edit /proc/net/tcp?

I need to edit 1 line in /proc/net/tcp while the file is also used by the linux kernel for updating other lines of it by the kernel. Background: Each line in /proc/net/tcp represents a TCP socket. ...
0
votes
1answer
167 views

ip_conntrack and FreeBSD

We can figure out number of connections in GNU\Linux with ip_conntrack module, And I can print current connections and maximum of connections with: root@debian:/home/mohsen/test/shell# sysctl ...
0
votes
1answer
22 views

How does tcp communicate back to the application? [closed]

Are there standard sytem calls to send data to TCP? And back? How does TCP tell the application to send more or less?
4
votes
1answer
984 views

How to investigate a random reset on TCP client port connected via loopback interface to a server

I have a test suite which initializes a server on the localhost and then runs thousands of stress tests which include starting and stopping clients connecting to this local server on same machine. I ...
2
votes
2answers
523 views

“tcpdump” to capture the last packets

I am monitoring a certain port, because my application uses that port, it seems that the connection drops at random times, I want to see what are the last packets passing through before the connection ...
1
vote
3answers
104 views

Is it bad to select remember me option in the browsers of a compromised machine?

I was reading an article on how to sniff network packets. (of course for knowledge purposes only). I came across these particular lines. For instance, say I was sniffing traffic on the network, ...
4
votes
1answer
3k views

Comunicate with remote Serial over TCP/IP as /dev/ttyX device

I've one serial device on 192.168.x.x:yyyy (where "x" and "y" are real number) and it works correctly. But I want to communicate with this as /dev/ttyX device. I've tested socat command but not ...
1
vote
1answer
680 views

Does an in-kernel firewall sit between the network access layer and Internet layer?

This question is a follow-up to my previous question. Logic for me to says that an in-kernel firewall sits between the network access layer and the Internet layer, because it needs to have access to ...
5
votes
1answer
218 views

Disabling TCP/IP during boot process in linux

I'm trying to install Linux on an FPGA board. The linux flavour is petalinux for Xilinx FPGA chips. The current Xilinx SoC has a Cortex A9 processor and a programmable hardware logic i.e FPGA. I ...
4
votes
1answer
3k views

What does net.ipv4.tcp_app_win do?

I can't figure out why do these variables coexist in Linux. The information from man tcp says (Ubuntu 12.04): For tcp_adv_win_scale: tcp_adv_win_scale (integer; default: 2; since Linux 2.4) ...
0
votes
1answer
633 views

How do I safely perform the below changes to network parameters on Solaris 10?

I need to change and test some TCP/IP network parameters on a Oracle Solaris 10 as a possible workaround for a bug in 'Oracle Hyperion EPM 11.2.1.0' in the development environment. I am not a ...