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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12
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2answers
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arp-requests cannot be seen by specific nodes

I create an open ad-hoc wlan by using iwconfig (I have the same issue with wpa_supplicant as well). there are 4 nodes on the network as seen on the figure below. The nodes run ubuntu 12.04 and debian ...
0
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1answer
93 views

How to run Different congestion control algorithms in FEDORA 17?

I need to use different congestion control algorithms for tcp flow. How can I continue using those flow congestion algorithms from Fedora 11 in Fedora 17?
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2answers
71 views

determine IP for device [duplicate]

I am configuring an eth1 interface on in Red Hat, but I don't understand exactly what the IP address should be. I'm given an IP of 10.237.128.0/25. This means that the NETMASK would be ...
0
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1answer
364 views

Open source proxy server SSL interception and HTTP header insertion [closed]

I am new to proxies. Can anyone suggest an open source proxy server that supports SSL interception and HTTP header insertion.
2
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3answers
901 views

Bridging eth0 to wlan0

I'm trying to create the followig setup: +----------+ | Wi-Fi | +----------+ ...
0
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2answers
123 views

I can't ping my server from certain IP

I have 2 internet connections from 2 different ISPs with static IPs, lets call them A and B. A connects to the server in several ways (ping, SSH, HTTP), while B cannot do anything (ping, SSH, HTTP). ...
2
votes
1answer
356 views

FreeBSD 2 network cards

We have server with 2 network cards with FreeBSD on it. 1 card used for internet (works fine) and another one for local network connection (to 192.168.227.0/24 net). When i try to ping gateway of ...
3
votes
3answers
8k views

How to “restart” particular network interface on RHEL?

In RHEL, instead of using service network restart command, how can i restart a particular network interface, lets say "eth1", with only one command. "Only one command" because that is the only ...
0
votes
1answer
249 views

Which Package has net_tstamp.h?

I attempted to compile the source code here: http://os1a.cs.columbia.edu/lxr/source/Documentation/networking/timestamping/timestamping.c?a=x86;v=2.6.32 However, I got a compiler error: error: ...
0
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1answer
2k views

How to scan New network card or any other devices in linux

I am trying to add a New Network card into Machine which has Linux installed. But my problem is, I cannot reboot the Linux host to detect the new network card, is there any workaround for this? I ...
0
votes
1answer
104 views

Interface ip address discrepancy

This is very strange. Output of ip route show: default via 192.168.1.1 dev eth0 metric 100 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.10 192.168.1.0/24 dev eth2 proto kernel scope ...
1
vote
1answer
161 views

Changing Linux Layer2 forwarding decision?

Are there tools to define in Linux something similar to Policy-based Routing, but on Layer2 level? Usual Linux bridge uses destination MAC to decide, which interface to send frame to. Can this ...
1
vote
2answers
179 views

Can I reassign eth1 and eth2 without rebooting the server

Say I have eth0 - my management interface, then eth1 with mac1 and eth2 with mac 2- additional nics running. How can I reassign eth1 with mac2 and eth2 with mac1 and bring them up without the reboot?
-4
votes
2answers
679 views

Hack Cisco Pix 501 to Run Linux [closed]

Can a Cisco Pix 501 be hacked to run Linux with a similar feature set? Is this possible? Has it ever been done? The pix seems like reliable solid-state hardware and it would be cool if I could run ...
0
votes
1answer
138 views

Add second IP block to one debian box (one nic) from different subnet than the first block

I have zero networking knowledge, so bare with me please. I got the following: xxx.xxx.199.208/29 xxx.xxx.221.64/27 The /29 IP block is available directly from the network drop The /27 IP block is ...
2
votes
2answers
164 views

Why there are always 10% of loss when testing with mtr command?

For example, if I run this command against example.com, with mtr command, I always get 10% of loss, no matter how many time I run, why exactly is 10%? mtr --report 192.0.43.10 HOST: localhost Loss% ...
-1
votes
2answers
269 views

iptables TCP handshake on Centos 6.0

Here's my iptables script: #!/bin/sh service iptables stop iptables -F iptables -P INPUT DROP iptables -P OUTPUT ACCEPT iptables -P FORWARD DROP iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -p ...
1
vote
1answer
479 views

HTTP Keep-Alive puzzle with EC2 Linux, Nginx and Chrome

Please, help to solve HTTP keep-alive problem. Basically, I have amazon-ami linux (v2012.09) on EC2 running nginx (v1.2.6). Chrome (v25.0.1364.99) accesses HTTP page normally, then after about 30 ...
-3
votes
1answer
74 views

mount point and distributed folder

I have 10 unix servers and in that /home is common in all the unix servers and any update in /home of any server is getting reflected in all the servers. How is this done? and also please let me know ...
1
vote
2answers
236 views

Ubuntu Server 12.10: set up network bridge in the initramfs pre-boot environment

In this scenario, I have a machine that boots its root volume off of iSCSI, and it only has a single network interface. If network configuration is done the normal way, then taking the interface down ...
0
votes
3answers
316 views

Name resolution behind a proxy

Using Linux (Debian) At my current place of employment I'm behind an ISA proxy server, I'm not in a position to make any changes on this machine. I'm developing software and have set up a virtual ...
1
vote
1answer
160 views

Multiple macbooks can't connect to company web server

We're having a very strange problem where 2 macbooks running osx 10.8.2 can't connect to our public facing server on any port. Attempting to ssh or navigate to the web server fails, but every other ...
4
votes
2answers
1k views

Am I using virtio for my KVM guest?

In one of my KVM guest, when I typed the following command, I get the following /sbin/lsmod | grep vi virtio_balloon 3692 0 So does it mean I am using virtio? Update: When I type cat ...
0
votes
4answers
3k views

IPv6 only works after pinging the default gateway.

We now have 2013 and I thought it is long overdue to activate IPv6 on my server. But unfortunately, I ran in some problems. To be honest I only have litte experience with IPv6 So I hope you can help ...
0
votes
3answers
222 views

How to access a server from different LAN, through web and SSH via Internet

Here is my scenario: I have a server (with CentOS on it) configured so that it will maintain the users from a LAN with some common requirements. That server will be deployed in different countries on ...
0
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0answers
139 views

Iptables - limiting connections to port range

I want to limit connections to my server to one connection per second on every port in range 10000:65535 I started using this rule: iptables -A INPUT -p tcp --syn --dport 10000:65535 \ -m ...
0
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1answer
49 views

Tracking data sent to remote host over time?

What is a a good way to track over time the amount of data transferred from my Linux server to another host on the internet? https and imaps only
1
vote
1answer
299 views

Setup Network with two ISP

Currently I have a network with 1 ISP, a router/modem, Gigabyte Switch and a server. All the clients PC are automatically assign IP from DHCP server from a Router/Modem A. Server A have a fixed IP ...
0
votes
2answers
602 views

OpenSSH Can't Connect on Fedora 17

Having trouble SSH'ing to an internal server that is outside of an enterprise level firewall. I have a fresh install of Fedora 17. Here is the command I'm running: ssh ...
2
votes
1answer
189 views

Bandwidth fluctuations while running java server

We are running a distributed system of java servers (os: linux) doing lot of computation with communication over TCP. While our traffic pattern in not bursty, on some machines we see a fluctuation in ...
1
vote
1answer
120 views

Ubuntu Second Wan Interface Card

I configured 3 network card. one of them is LAN card and others are Wan network card. eth0 Link encap:Ethernet HWaddr 00:50:56:00:30:da inet addr:5.x.x.1 Bcast:5.x.x.3 ...
0
votes
0answers
83 views

Two Xen hosts with a crossover between and failover public IP between them both. configuration?

I have two servers with Ganeti installed (Xen) I want to be able to migrate the instance between the two servers so the instance's network configuration needs to be host agnostic. The datacenter that ...
3
votes
1answer
171 views

ip command vs route command, what's the difference?

I see both ip and route commands used for configuring the kernel routing tables. What's the difference? It seems to me that the ip command is preferred more. Is it so, and why?
1
vote
1answer
88 views

Why can't I reach the LAN side of a slave vrrp router?

I have a dual linux firewall/router setup that is connected to 2 different upstream providers. Internally the default route is a failover using vrrp. The setup looks something like this. The routes ...
0
votes
1answer
514 views

Keepalived in ring architecture, or other better approach

I have three load balancer (LB1, LB2, LB3) and plan to use ring architecture for active-active setup, e.g. LB1 LB2 LB3 IP1 IP2 IP3 Idea as below: If LB1 failed, IP1 will be floated to ...
0
votes
1answer
177 views

IPV6: two interfaces with dhclient

I have eth0, eth1. For each interface run dhclient on default port 546 (547 ?). eth1 does not have connection to the network. If dhclient for eth0 bounds before dhclient eth2 starts the eth0 gets IP. ...
0
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2answers
777 views

How do I configure dd-wrt to forward IP Protocol ID 50 & 51 traffic to an internal machine?

Please note, I'm not talking about TCP or UDP traffic. Rather IP traffic with the protocol ids of 50 and 51. The point of this being that I can then pass IPsec traffic thru to the internal machine ...
2
votes
1answer
134 views

Linux router: bandwidth of client

I am trying to build a linux router (captive portal) with a local RADIUS server for authentication. I want to log the bandwidth being used by each client on my network. I want to associate bandwidth ...
1
vote
1answer
573 views

Setting up bridging for Qemu and routing for OpenVZ (venet) with multiple subnets on Debian Linux

So i've been searching the past couple days trying to figure out the best way to achieve this but still can't get it figured out. I have a debian server setup running Proxmox to host OpenVZ and Qemu ...
4
votes
1answer
280 views

RHEL/CENTOS6 Interface naming and IP assignment for rotating MACs

Background: I am creating an RHEL6 OS disk image that will potentially be passed around to many different computers with identical hardware (except for serial numbers such as MACs). The image is ...
0
votes
1answer
97 views

Open Stack Installation - single server

I have managed to set up openstack on a single machine, everything appears to work with exception to being able to ssh. I can ssh to the instance from the host box, which has a public ip. However as ...
1
vote
1answer
94 views

Machine with multiple networks/gateways. SSH through different network from global default GW

I have a wired connection with IP/subnet/default gw. I also have a wireless connection with IP/subnet/default gw. The default gw of the machine (route -n) is the wired default gw. But I can only ...
1
vote
1answer
1k views

bridging two network interfaces in ubuntu linux 12.10 AND being able to access it from that machine

Ok, i have about had it but heres the deal. I have 7 total machines connected like this: [5 workstations]<--->ServerPC<---->MAINPC<---->router FYI, dont worry about the workstations they ...
0
votes
1answer
81 views

Outbound traffic from domU shows dom0 IP address

I am having a problem with Xen where all outbound traffic from domU's are showing up as if it was coming from the dom0. Traffic passes both ways without a problem. I do not have NAT enabled. I am ...
1
vote
1answer
86 views

Understanding origin of some ICMP error packets

On my firewall/router Linux box I quite often see ICMP host/port unreachable errors like: Jan 10 10:11:56 localhost kernel: [80413.542607] firewall-invl: IN=wan OUT= ...
1
vote
1answer
714 views

Linux & IPv6: How to bind to an arbitrary IPv6 address? [duplicate]

Possible Duplicate: Can I bind a (large) block of addresses to an interface? I have a /48 IPv6 block. I'd like to be able to do this: $ wget --bind-address=<1st-ipv6> ...
2
votes
1answer
188 views

A thin client running Linux in a wireless network environment

I am the sole IT person for a small private school. The school has about 60 PCs. All PCs are on a wireless network; there's no Ethernet network in the building. I would like to migrate the school ...
0
votes
0answers
46 views

Backup laptops mac address in local network

I am looking for a good method to automatically clone directories from laptops that is currently connected to the local network to a server on the same local network at a regular interval in a small ...
-3
votes
1answer
501 views

Changing the default gateway address in Centos

I have a a Centos PC with 2 IP addresses. One of them is because of a back to back connection with another PC, so both run on different subnets. The eth0 has the 192.xx.xx.xxx address and eth2 has ...
1
vote
2answers
53 views

Is it necessary to specify server ip in the destination option of the iptables rule?

I use iptables to log all incoming connections. While going through the log in var/log/messages, I notice that there are some incoming connections from another computer to an unassigned LAN ip ...