Linux Networking refers to any networking function performed by a server running Linux. A Linux server operating as a router or firewall are the most common applications.

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Need solution for linux box with two ethernet cards

I need a solution for the problem for the project work. We have devices, servers and clients working where each device shall have two ethernet cards installed in them. While communicating all the ...
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130 views

substituting for a router in a closed virtual environment

Just a quick question, how can I create a substitute for a router in a vmware esxi environment containing several windows and linux servers on two seperate subnets? I would like to use redhat as the ...
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810 views

redundant network handling in linux box

I need your help very badly. I have give a solution for the requirement. I'm struggling for 5 days to get one. Requirement is to get a solution for redundant network in Linux systems. We have ...
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0answers
990 views

StrongSwan - Windows 7 0 IPSec IKEv2 connection problems

I am trying to configure a roadwarrior scenario between a linux box with StrongSwan and a Windows Box with Agile VPN. I successfully configured my StrongSwan and my Windows box to connect. The Windows ...
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2answers
878 views

Linux/Samba: Broadcast Linux server name on the Windows network?

In order to test my web development work, I've setup a Linux VM on my computer. I'm using Adapter Bridging (instead of NAT) so that I don't have to worry about setting up port forwarding. It works ...
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1k views

How to configure smb.conf file for samba share in centos 5? [closed]

Iam new to the samba, so can anyone please give basic information to configure smb.conf. And also how it provides permissions and authentication?
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2answers
9k views

PXE Booting Virtualbox guests in internal networking mode?

I am not sure if this is just specific to my distro's packages or is a vbox limitation. So, any help would be appreciated. Ok, so I have a network of VMs, with one VM acting as a NAT for the other ...
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1answer
1k views

Linux Firewall Rules

I've configured firewall rules using iptables. Outbound packets are being blocked. It seems like outbound packets are enabled. Does the use of bonding change anything, or do I just have incomplete ...
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2answers
485 views

Is there a way to trace what's sending gratuitous arps?

We have a box that's just started acting up and we're not really sure why. It has IP address (dummy examples) 199.199.199.1 on eth0, 127.0.0.2 on eth1, and 199.199.199.2 on eth1:0. Recently, for some ...
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2answers
39k views

Linux e1000e (Intel networking driver) problems galore, where do I start?

I'm currently having a major problem with e1000e (not working at all) in Ubuntu Maverick (1.0.2-k4), after resume I'm getting a lot of stuff in dmesg: [ 9085.820197] e1000e 0000:02:00.0: PCI INT A ...
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1answer
220 views

Consumer board for 4* commodity cluster in tetrahedral back-to-back GB-lan topology

I'm not very sure what consumer board to choose for such a configuration. Im planning to build one or more "Beowulf-like cluster" (starting with one for testing), one such cluster consists of four ...
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1answer
333 views

Cannot telnet my computer

A service is running in my system (redhat linux) which opens the port 9000. When i do # telnet localhost 9000 it says, Trying 127.0.0.1... Connected to localhost.localdomain (127.0.0.1). Escape ...
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1answer
737 views

How to whitelist range of MACs in 75-persistent-net-generator.rules?

I have a Debian Squeeze (2.6.32-5) guest in KVM that has all virtio network interfaces, and their MACs are apparently blacklisted by udev as per /lib/udev/rules.d/75-persistent-net-generator.rules ...
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3answers
6k views

How to see on Linux what network interface and source IP address is used for a route to a specific destination host?

If I have multiple network interfaces (here: 2) on a Linux machine (here: Debian Lenny). How do I see, over what network interface (NIC) a route to a specific destination host is going and what source ...
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1answer
337 views

SFTP with Qwest DSL and Static IP

I've poked around a bit and elements of this question are answered here but I'm still not sure what to do. Here is my situation. I have a SUSE Linux box that I want to be an Internet-facing SFTP ...
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1answer
492 views

How to use teacup on ubuntu

I need to download EXPECT package using teacup on my ubuntu client. I have installed Active Tcl 8.5. I also have installed EXPECT for LINUX. But, I don't have EXPECT package to work with Tcl Dev ...
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1answer
570 views

How to install GNU/Linux on ADSL router to setup internet watchdog?

What model of ADSL modem/router by major market brand can be used to install some distro of Linux to setup a watchdog to initialize connection by demand in case for example of main internet connection ...
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1answer
100 views

Trying to create a reverse proxy and app server on one machine with virtual interface

I have a single server on which I need to replicate a two server environment for testing purposes. One of the servers is an Apache reverse proxy and the other is an app server. What I imagine I ...
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1answer
527 views

Why do my server requests time out on particular server?

I have quite a strange situation and hope you can help me figure it out. I am running a student server that is hosted by my school. We have our own public IP address on the net, and I was told once ...
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1answer
6k views

Is it possible to close a socket with a shell command?

Is it possible to close a socket by using some sort of shell command/program? I've seen plenty of examples of manipulating sockets using C and other languages but have been unable to find a program ...
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1answer
2k views

How to configure linux routing to send packets out through the same interface they were received on?

I have the following routing table 10.0.1.0/24 dev eth0 proto kernel scope link src 10.0.1.151 10.0.10.0/24 dev eth1 proto kernel scope link src 10.0.10.151 default via 10.0.1.1 dev eth0 I ...
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1answer
640 views

Two NIC's in the same ip segment

What is the best technical solution to solve this? I have a /24-segment with two NIC's in one Linux Server (lets call it srv) that have two IP-addresses in this segment. NIC1 / eth0 / 10.10.1.101 / ...
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3answers
628 views

Prevent other admin users from changing network settings, ubuntu linux

On an Ubuntu linux server, I would like to prevent other root users / admins from changing the network settings. I want to set a static IP address/network settings and then lock it in a way that even ...
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3answers
296 views

Access server via IP v6?

Question: I'm playing with IPv6 and converting it to IPv4 and vice-versa. I wanted to access http://127.0.0.1/ And did the standard ipv4 to ipv6 calculation: AA = 127 BB = 0 CC = 0 DD = 1 with the ...
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2answers
892 views

Add range of ips to centos networking?

I got an extra /28 ip range for a centos based VPS. I am wondering how to add them as range in /etc/sysconfig/network-scripts , instead of creating 13 ifcfg-venet0:x files. Thank you!
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155 views

How to associate ip range to interface

How to associate ip range to specific interface. I have multiple vlans and till today i have worked with 1 ip range, but i need to increase ip range to second vlan. My first few lines of config ...
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2answers
1k views

Anyone can tell their experience with 10g Ethernet adapters on Linux

I wonder if any of you have an experience with 10g NICs (Intel, Myricom, SMC tiget, napatech, or by any other brand). Questions are: Was it easy to install, or a hassle, How does this adapter ...
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1answer
118 views

iptables entry to log ip address on one side of bridge

I was wondering if anyone knew of an easy way to capture only the ip addresses on one side of a connection. I have a transparent Linux bridge with iptables enabled so that I can do network accounting ...
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472 views

getting interface names from dmesg lines

I have some lines like [ 17.440000] eth0: XYZCOMPANY ABC4353 802.11 Wireless Controller [ 17.540000] eth1: XYZCOMPANY ABC4353 802.11 Wireless Controller [ 17.640000] eth2: XYZCOMPANY ABC4353 ...
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3answers
146 views

Network setup help

I'm going to set up a network that looks like this: There is no Internet connection, i.e. this is a closed network. There will be one Ubuntu 10.04 server (64-bit) that handles all the services ...
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4answers
896 views

How do I get my 192.168.* Linux server accessible via http://hostname/?

(Sorry if this question isn't worded well and/or is duplicate. I'm not a networking guy and I'm probably not using the right terms...this also makes it hard to see if this has already been answered.) ...
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4answers
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Hostname problems in CentOS 5.5

I just set up a CentOS 5.5 machine on my local network and attempted to modify the hostname by editing /etc/sysconfig/network file. When I'm logged in locally the change to the hostname is reflected ...
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3answers
1k views

How to Hide OS Fingerprint of Virtual Machine?

Is it possible to make a linux virtual machine appear as the host machine to a network tool like nmap or Blue's Port Scanner without recompiling the kernel?
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3answers
360 views

Any free networking lab?

I want to study network. But I don't have an access to a sample network (routers, DNS, IP4, IP6 windows linux mixed heterogenous system). Do you know any online network to study (Free as possible). Is ...
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1answer
1k views

netmask: command not found

I purchased a new server with a few ip's so I modified the /etc/network/interfaces file recently so that my ip's can go live. While editing that file I created a backup and deleted the original file. ...
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2answers
78 views

server and user directly connected no pinging

I have a server and a box that cannot communicate, a server(fedora 12) with two nics on it, directly connected to say 192.168.1.0 and 192.168.2.0 the route table looks like this Destination ...
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1answer
2k views

Virtualbox - routing subnet to bridge adapters

I have set up a Debian Lenny box with 3 vbox Lenny machines running eth0 of the host in bridged mode (on virtualbox 3.1.6). When testing in my local LAN, this all worked perfectly well and traffic ...
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319 views

How to remap IPs visible from local machine to IPs visible from a machine I have SSH access to?

I'm so far out of my depth I don't even know what to google for. There's a server I can connect to via SSH. Via that server I can access other server on its subnet via SSH. What I want to do is be ...
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1answer
201 views

Why does eth0 show an IP if I'm booting into runlevel 1?

I'm having some issues with networking on a new Linux server I'm building. The OS is SLES 11. When booting into runlevel 1, I see that eth0 is showing an IP. Physically, there is a network cable ...
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1answer
1k views

bridge traffic limiting via tc

I have a Linux machine running as a bridge simulating various network conditions. I use tc for this. Introducing delays or packet loss is quite simple but I got into trouble trying to configure ...
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3answers
872 views

How to detect which process is doing a port scan

I have Linux server running a unauthorized process (which I do not know the name of) which is doing a port scan from the server out to the internet. How do I find out which process this is and kill ...
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3answers
195 views

Linux networking essentials

Can someone suggest a book which contains all the essentials required for linux networking. I need something that common to all linux distributions rather than specific distribution. Thank you Bala
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2answers
5k views

Difference between /etc/hosts and /etc/resolv.conf

What is the difference between /etc/hosts and /etc/resolv.conf? Also, is there a good documentation that explain all these configuration files. Thank you. Bala
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2answers
660 views

Dual NIC Networking CentOS 5.3 (losing connection)

I have a CentOS System with two NICs on it. One is Ethernet the other is Wireless. The Ethernet has an address of 192.168.1.110 and is tied to a LAN. (The LAN provides DHCP and DNS for its domain ...
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149 views

Linux - Apache Web Server behind Windows Network

We have a local Windows Server 2003 DNS server that handles all incoming requests. We used to host our website locally on IIS, which our local DNS server would point to for incoming requests. We ...
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linux server constantly kicking me out

I have a linux server that has started acting a little funny... First of all the box is way under utilized. It's a database server, with a very low load. I'll put vmstat below and top... I'm ...
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242 views

“Symbolic link” for NICs under Linux?

Currently on my Linux server I've enabled bridging so that I can use OpenVPN in bridged mode. Works great. eth0 is connected to the LAN; tun0 is the OpenVPN gateway; these are bridged to a new ...
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1answer
5k views

Openvpn - enabled redirect gateway but can't access any websites

First of all I'm a newbie to servers but not to stuff like programming so not totally alien to command lines etc. Second, I want to run openvpn on my remote server and connect from my ubuntu desktop ...
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2answers
921 views

your approach to complex iptables rulesets

i'm interested how do you write your complex packet-filtering rulesets on linux router acting as firewall. one with default-drop policy. i usually go with such approach [ just an artificial example ...