0
votes
0answers
36 views

Virtual machines using wrong IP addresses

I have a host computer (A), running three virtual machines: X,Y and Z. They're under a NAT layer, in which the Host A is the gateway (192.168.0.1/16), and the VM's are respectively 192.168.0.2 (X), ...
1
vote
1answer
42 views

How to configure the physical machine and virtual machine?

If I want to transfer data between the physical machine (windows operating system) and virtual machine (Linux real time operating system). Could anyone please explain about configuring the data ...
0
votes
0answers
91 views

Configuring an experimental TCP/IP computer network using a virtual machine

I don't have extensive experience to computer networks and I would like to practice using a Linux distribution and virtual machines like virtualbox or vmware. I imagine a host Ubuntu/Linux PC and a ...
0
votes
1answer
186 views

Is it possible to have a Linux box with 2 Ethernet adapters, connected to 2 networks with same IP range (no routing needed)?

Bear with me. This relates to this Stack Overflow question. My Linux thing (actually a BeagleBoard) has two interfaces, eth0 and eth1. It needs to connect to a client's network on eth0 (address ...
0
votes
1answer
112 views

how to setup linux-igd to use webserver on same machine

So I have a web server on port 80 and linux-igd/upnp running on the same machine using dhcp. I want to configure linux-igd to be a way to get to the webserver. I found this tag in the linux-igd xml ...
1
vote
1answer
394 views

How do I prevent Linux kernel from responding to incoming TCP packets?

For my application, I need to intercept certain TCP/IP packets and route them to a different device over a custom communications link (not Ethernet). I need all the TCP control packets and the full ...
3
votes
2answers
449 views

No route to host after changing interface to static ip

I installed a Linux (Ubuntu) server inside my home LAN, initially it's automatically configured to use DHCP interface. I'm connecting to this server from another computer using that server's hostname. ...
2
votes
1answer
389 views

Change the default route without affecting existing TCP connections

Let's say I have two public network addresses on my server: one NAT through an ISP (192.168.99.0/24), and a VPN through a different ISP (192.168.1.0/24), already configured with a per-host route to ...
3
votes
1answer
586 views

User defined mapping hostname-to-address without root privileges

Is it possible to define a mapping hostname to IP address in Linux without root access (ie modify /etc/hosts) nor a DNS server ?
0
votes
1answer
175 views

Is it possible to figure out which http request generated the corresponding response

I am using iptables to listen to tcp (http) packets. I am filtering out INPUT responses containing a matching string. Is it possible to know which http request generated the response. Assuming 10 ...
10
votes
2answers
3k views

On the Performance of TCP implementations of Linux and Windows

As I understand the implementation of TCP stack in windows and Linux are different. Windows uses a congestion control algorithm known as the TCP Reno while Linux uses Cubic. How do the 2 protocols ...
1
vote
1answer
1k views

Can't access HTTP server, but ping works in LAN

I encounter a problem when configure the connection. My computer resides in a LAN, I want to assign it a static IP address. Thus with the help of port mapping on the router, I will be able to access ...
2
votes
2answers
2k views

Using localhost TCP/IP communication in a program - always safe?

I have an application which is separated to several parts (processes) communicating over TCP/IP, using a pre-defined port on localhost. Is this always safe? Can some kind of a firewall (corporate, ...
4
votes
1answer
6k views

Is there a hard limit of 65536 open TCP connections per IP address on linux?

Is there a hard limit of 65536 open TCP connections per IP address on linux? I read somewhere that there was, but someone is asking for confirmation and i just can't find it. I seem to remember it ...
2
votes
2answers
628 views

Force command-line tool to use different interface?

I have a service which I want to run over eth1. But all my other traffic still needs to run over eth0. Is it possible to force a command-line tool or other application to use the non default ...
3
votes
1answer
2k views

Nmap “operation not permitted” error

I'm running CentOS 5.3 in an openVZ container, and I'm receiving "operation not permitted" errors from Nmap. [root@test nmap-5.21]# ./nmap scanme.nmap.org Starting Nmap 5.21 ( http://nmap.org ) ...
4
votes
2answers
593 views

Is `ip` to supersede `ifconfig`

A friend of mine said that ip is supposed to be the successor of ifconfig and iwconfig — yet I found no Wikipedia article about it and have never seen anyone mention or recommend it online even though ...
1
vote
1answer
591 views

Fix Internet connection stalls (packets getting stuck somewhere?)

The wireless AP I've been using has glitched out and the two symptoms are the DHCP server no longer working, and random stalls in the connection. I can't reboot it, so I've been trying to solve the ...
1
vote
2answers
155 views

Route Local Network through Server?

This may or may not be an easy question, as I'm somewhat uninformed in the networking side of computer science. I own a rented server with a static ip address. Is there a way that I can forward ...
0
votes
2answers
780 views

Changing MAC address in a linux machine (fedora 8)

I am doing a test on MAC learning and for that ,I need to change my MAC address of linux machine while the interface is UP. To be more clear, consider eth1 in a fedora core 8 machine. And while the ...
1
vote
7answers
4k views

In linux, how can I get my IP address - ifconfig and ip addr show are not working

This should be simple, but the machines we ssh into don't seem to have the regular commands. Are there any other simple ways I can use to get my IP?
2
votes
1answer
975 views

Smokeping monitoring IP address and port

I have successfully install smokeping on my Ubuntu Karmic machine and am monitoring servers. I need to be able to monitor an IP address and a port, can someone tell me how I do that? I looked into ...
2
votes
2answers
1k views

Linux Kernel Packet Forwarding Performance

I've been using a Linux box as a router for some time now. Nothing too fancy, just enabling forwarding in the kernel, turning on masquerading, and setting up iptables to poke a few holes in the ...
4
votes
2answers
261 views

Prevent a download to saturate all bandwidth on Linux

In Linux, a single download can use all available bandwidth, so that any other connection can't be started. (e.g. if I am downloading updates, I can't surf the web at the same time) Is there a way to ...