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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Service httpd restart error

Why do i always get the error when ever i reset my httpd: Starting httpd: (98)Address already in use: make_sock: could not bind to address [::]:80 (98)Address already in use: make_sock: could not ...
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66 views

Cant access LocalHost from Browser

I hav installed apache2 & php 5.3x on centos 6.3 by using following commands: yum install httpd yum install php Now I'm trying to access php page from my local machine browser using following ...
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1k views

IP setting in CentoOS 6.2x64 by XenCenter 6.2

I have setup a Guest CentOS virtual machine in Xenserver.. I have updated the Xentools but i cannot find the option to config my IP Address which is showing to be 'unknown' currently. All i need to do ...
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56 views

gather information about packet from malicious ip

I have a glassfish server running some webservice and I noticed that there is an abnormal traffic from japan (150.70.x.x) in my iptables log file and I dont have any user in this country . Until now ...
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1answer
214 views

Analyzing a periodic network spike

One of my servers has a semi-predictable network input spike at 6:45 every day. It comes as early as 6:30 and as late as 6:50, but always lasts for less than 1 minute. I'm trying to figure out how to ...
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28 views

Connecting two VM's connected to a bridged network using pppd [duplicate]

Possible Duplicate: Communication between two systems using pppd I have two Virtual Machines (both Ubuntu 64-bit machine) connected to a bridged network.The name and ip-address are give below....
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117 views

Routing via Linux

I have an individual network with a single machine having IP Address 10.10.10.4. Another machine (Gateway Machine) has two NICs: eth0 and eth1. eth1 (10.10.10.10) is connected to the internal network ...
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243 views

linux sever interfaces automation

I am using a CentOS server which has about 6 active interfaces with different IPs, I'd want to automatically bring down all the interfaces when any one of the 6 interfaces is down. Is there a way this ...
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1answer
590 views

Why rinetd is working locally but not working remotly?

/etc/rinetd.conf 0.0.0.0 443 10.30.224.7 636 allow * >lsop -i|grep rinetd rinetd 27099 root 4u IPv4 2553556 TCP *:https (LISTEN) Also iptables -L -n returns nothings. Still, ...
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2answers
621 views

Is it possible to boost my server's LAN bandwidth with two Ethernet ports?

Is it possible to boost my server's LAN bandwidth with two Ethernet ports? I have two Ethernet ports on my Dell PowerEdge SC1435 and I routed both eth0 and eth1 to my router, but for some reason I'm ...
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2answers
11k views

Higher rmem_max value leading to more packet loss

The rmem_max Linux setting defines the size of the buffer that receives UDP packets. When traffic becomes too busy, packet loss starts occurring. I made a graph showing how packet loss increases ...
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3k views

Cheap way to detect client round trip times for http

I am trying to figure out a way to detect round trip times for each IP that connects to port 80 on my server. What is a good way to do this? There are far to many connections, and pinging each ip is ...
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1answer
665 views

Limiting a process' network access on Linux?

I've been researching how to sandbox processes, and I came across cgroups, which looked promising. I'm not super interested in using virtualization or strace for this, since I want programs to run as ...
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1answer
3k views

IBM HS23 Blade Server (7875) onboard NIC driver for linux

I work with IBM HS23 Blade Server (7875). It's onboard NIC adapter is: Emulex OCl11104-F-X Virtual Fabric Adapter 2-port 10GB and 2-port 1GB LOM . I'm tryed to the following Linux OS with the ...
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1answer
1k views

Determine the IP address of the DHCP server from a client machine

I would like to know what is the best way to get the DHCP server address from a client (linux based), who just got an IP address from the DHCP server? I searched and found this in most of the ...
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1answer
4k views

Iptables / What is the difference between connmark and mark?

While adding iptables rules, I couldn't understand what is the difference between connmark and mark? If anyone explains it with detailed explanations, I will be appreciated.
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2answers
7k views

How to route UDP traffic from one public IP (linux) to another public IP(Windows)

I want to prevent direct access of my Windows Machine and want to expose some programs running on it via my Linux Machine (which again is accessible by a Public IP). Is there a way where-in I can ...
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1answer
3k views

Static Network configuration with bridge in CentOS 6.2

I have a server with CentOS 6.2 installed, I want to use it as a VM host to run some windows installations for development purposes. I wanted to be able to directly RDP and serve websites from IIS on ...
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2answers
1k views

iftop Shows Lots of Mysterious Connections - Not Showing in netstat

I've just stopped all pretty much all services except sshd on my server (Ubuntu Server 10.04), and when I run iftop I get output that looks like this: 12.5Kb 25.0Kb ...
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3answers
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tcp handshake failed.client send rst (after syn-ack). can any one advice?

topology: 2 linux computer connected directly . no iptables rules (except - iptables -A OUTPUT -p tcp -j NFQUEUE ) no firewall. route is defined as - "route add default dev eth0" on the second one ...
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1answer
386 views

server dosnt produce syn-ack

I have a small program that take packets from the nfqueue . change the ip.dst to my server dst (and ttl), recalc checksum and return the packet to the nfqueue. The server and the client are linux and ...
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2k views

Hosting websites on a public ip routed via a private subnet using one Linux machine as both router and server

I use Ubuntu server as router, NATing router and webserver. The server is connected to ISP with a public /29 subnet. Also I host some important websites on it. I asked the ISP to provide ipv6 address ...
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684 views

Two network interface bridges - one LAN

I have little bit lack of linux networking understanding, so there is my question: We have 2 computers (SRV1, SRV2). Each of it has 1 NIC and both are connected by OpenVPN bridge Configuration: ...
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Configure IPv6 routing

I've got IPv6 addresses from SIXXS. My host is connected with SIXXS network over a AICCU tunnel ("sixxs" interface). My host address is 2001:::2, the host on the end has address 2001:::1. On my host ...
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2answers
1k views

VMWare and Turnkey Linux appliance can't access network

I have a VMWare ESXi cluster running many Windows and Linux VMs perfectly. I have installed the Turnkey Linux Redmine appliance, and am having a lot of trouble getting the networking to work properly....
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526 views

TCP handshake ok, then the client isn't receiving any packets from the server

Topology: Client ----- Intermediate Device ----- Server Client: win7 Intermediate Device: unknown Server: CentOS 5.8 The problem occurs when the client and server are trying to establish a SSL ...
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312 views

Xen dom0 crashed

Lots of questions this week, I got this error on dom0, then the server crashed (according to /var/log/messages): Jun 22 10:02:09 453 dhcpd: DHCPACK to xx.xxx.xxx.xx (xx:xx:xx:xx:xx:xx) via eth0 Jun ...
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1answer
1k views

Which Linux distro can join Windows 2008 R2 ADS domain

Any opinions on which distros are best to use for connecting to a Windows 2008 R2 domain. I started off by evaluating various different strains of Linux with a view to establishing which were best ...
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2answers
1k views

Linux (Ubuntu 12.04) two gateways one nic

I have Ubuntu 12.04 Server edition Two gateways, both on 192.168.0. network, let's make them 192.168.0.1 and 192.168.0.2 I've read you should be able to add second gateway into /etc/network/...
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1answer
2k views

Listing the routing table takes long time to complete

When I print routes defined on my computer using route, it takes about 5 to 20 seconds to complete. Why does it take so much time? With VPN enabled: $ time sudo route Kernel IP routing table (...) ...
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1answer
795 views

Rewrite URL based off of IP on OpenWRT

We are running OpenWRT on a WRT54GL. I have been looking for an answer to this, but I can't seem to figure out what to search for, if its possible, or what combination of programs to use. I want to ...
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debian set eth0 autoneg off speed 1000 duplex full: Invalid argument

I use debian for my things,but when i config speed 1000 and duplex full the error occur the exactly command i use: ethtool -s eth0 autoneg off speed 1000 duplex full Cannot set new settings: ...
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700 views

Route web browsing through a separate iterface

I'd like to route web browsing through the wlan0 interface and the rest through eth1. Can you please help me with the iptables commands to achieve this. Below is my configuration. Thank you :) Edit: ...
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1answer
2k views

What are some options for acquiring a free realtime Linux distribution? [closed]

By realtime I mean something that can help with fast network I/O; Low-latency and high-throughput.
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102 views

Can I use squid (or anything) to do this? [closed]

I have a really crappy VPS, and a really good computer at my office (with a really good internet connection), but behind a NAT. Is it possible to expose my good computer by doing this: The good ...
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1answer
77 views

network user isolation

My question is for a network with a Linux iptables router gateway. How can it be possible to prevent inter-network traffic of those users. Think this case as a public network, IPs are distributed ...
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1answer
4k views

Error while bringing up eth1

I'm getting this error while bringing up my network card: (process:2550): WARNING **: _nm_object_get_property: Error getting 'State' for /org/freedesktop/NetworkManager/ActiveConnection/3: (19) ...
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1answer
799 views

qemu with tun virtual networking issues

I'm trying to setup a virtual networking environment using open-wrt qemu and vde2 The script to boot two qemu instances and conenct them together is the following IMAGE=/home/northpole/openwrt/trunk/...
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1answer
3k views

Port appears open locally but closed from another machine

I am currently trying to set up a Hadoop distributed compute cluster on my network. Currently. my cluster nodes are encountering a problem communicating with my master server. Right now I am working ...
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3answers
5k views

NAT via iptables and virtual interface

I'm trying to implement the following scenario: One VM-host, multiple guest VMs, each one gets its own IP-address (and domain). Our server has only one physical interface, so the intended use is to ...
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1answer
2k views

Load balancing ISPs on Ubuntu Server

I have a Dell server with Ubuntu 11.10 Server installed on it. The server has 3 Ethernet cards eth0, eth1 and eth2. I have two ISPs say ISP1, ISP2 eth0 has a public IP (provided by ISP1 - we require ...
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6answers
24k views

Ubuntu Server 12.04 can access LAN but not internet

Using Ubuntu Server (12.04) via command line, I can access the LAN (e.g. ping local machines) but not the internet (e.g. "ping google.com" or "sudo apt-get update"). How should I troubleshoot this? I'...
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1answer
3k views

Eth0 Interface Not Coming Up on Fedora 14

I'm trying to upgrade some old Fedora 13 servers to Fedora 14 following Fedora's docs. The yum commands ran very quickly and seemingly without error. However, when I rebooted after finishing the ...
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1answer
734 views

Linux rename vlan tagged interface - routes stick around from the old one

We use a 10Gig NIC with two vlans on it (private network and internet facing), and I am changing the routing on our private network via renaming the network-scripts for it. This is on CentOS 6.0. ...
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894 views

why ping6 fails if tcpdump shows ICMP6 request/reply traffic?

I'm having a very strange problem with IPv6 pings on OpenWRT (fon-ng firmware with IPv6 enabled) and hoping someone can help with investigation. In short - wpan0 interface with address aaaa::1/64 is ...
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2answers
143 views

Ethernet fails just for seconds

I have a clearos gateway linux working as gateway. I have some problems with the conectivity, everything works great but for a few seconds internal ethernet stops working. After 5-10 seconds, it works ...
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954 views

HA Active/Active Squid configuration?

Hi all i would like to ask if someone have any experience into configuring squid within an active/active cluster. First here is the actual configuration, which i would like to replicate to another ...
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2answers
54 views

I want to setup a dedicated server with an IP address, all traffic to that IP will need to be forwarded to a domain name

using IPtables in Linux DNAT, I can redirect all traffic to an IP address but that is not what I want. Instead of redirecting to an IP address I want to redirect all traffic to a domain name, i.e. all ...
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2answers
3k views

Is it possible to enable port isolation on Linux bridges?

On most managed switches you can enable Layer 2 Port Isolation. The implementation and terminology is different from vendor to vendor but generally speaking you keep one or more ports in the default ...
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1answer
1k views

Load Balancing, Active-Active config and dynamic server addition

Right. I'm looking into setting up a system something like this: / [Load Balancer] \ /\/\/\/\/\/\/\ [LAN1] - ----- | Server Pool | \ [Load Balancer] / ...