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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Why does ip_forward=1 cause inadvertant problems?

I did a google search and searched the Ubuntu forums, but couldn't find the answer I was looking for with my specific situation. What I have is the following: 2 handsets setup for VOIP ...
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29 views

Passing through RDMA network devices to docker containers

I'm wanting to passthrough infiniband to a docker container so that I can run some high performance apps over ipoib and use rdma. Currently, I'm doing this with xen virtual machines. Now I'm looking ...
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1answer
8 views

Forwarding traffic from one virtual interface to another

I have a router with two ethernet interfaces: eth0: 1.1.1.2 (with 1.1.1.1 gateway) eth1: 2.2.2.1 I created two new virtual interfaces: eth0:1 : 1.1.1.3 (with 1.1.1.1 gateway) eth1:1 : 2.2.3.1 ...
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27 views

Redirect Default Gateway Traffic in Linux to File

I am trying to troubleshoot one of my linux servers (ubuntu server). Therefore I want to intercept all traffic that is sent to the default gateway and then write it to a file: preferably some kind of ...
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1answer
27 views

Duplicate Ubuntu Server VM in Parallels loses networking [on hold]

I've created a fairly vanilla Ubuntu Trusty VM in Parallels Desktop, but when I clone it the resulting VM has networking issues. After shutting the original VM down, I duplicate the .pvm bundle with ...
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1answer
14 views

how to run pptp over redsocks proxy

I have one (virtual) Linux box in Ubuntu, that has redsocks set up done. Inside the machine, I could confirm that the the redsocks did work (use wget to check the external IP). Now, I want other ...
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1answer
16 views

DNAT packet after decryption of ipsec

how to DNAT packet decrypted by ipsec. encrypted packet is: sourceIP: 192.168.4.6 destIP 10.10.0.100: If i simply : iptables -t nat -A PREROUTING d 10.10.0.100 -j DNAT --to-destination 10.0.0.5 ...
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18 views

Enabled Intel® I/O Acceleration but no bytes transffered

I enabled IOAT but it seems that no data is transferred using DMA for network: I enabled IOAT in bios. CPU is Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz. I loaded the module in ubuntu 14.04 ...
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24 views

CentOS 6.5 Bridged Networking Fails

I have a CentOS 6.5 Server that I wish to host VPS on, as well as installing SolusVM, to do this I need to bridge the network adapters for the Server and the VM's ( so the VM's can connect to the ...
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2answers
31 views

SSH tunnel (port forwarding) slow down a lot my mysql queries

I'm currently testing some configurations with vagrant (virtual box) to connect 2 servers (VM currently) together throw an SSH tunnel. The goal being to securely connect my web app to the database. ...
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38 views

How can I log and maybe even block IPs that send lots of incoming UDP traffic?

we run a voice / teamspeak server which receives legitmate traffic on port 9987 from many ips. Sometimes we get DDoSed. So people use single Servers and send 1-3 Gbits of UDP Floods to that port. This ...
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1answer
42 views

How can I access a Virtual Machine on different subnet? [closed]

I have two virtual machine VMachineA and VMachineB using virtual box. VMachineA (CentOs 6.5) has two network interfaces: eth0 (IP: 192.168.3.48, GW: 192.168.3.1) and eth1 (IP: 10.10.200.1). ...
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25 views

Proxmox VE: Multiple shared public IPs with NAT configuration

I have a Proxmox VE (v3.3 @ Debian 7 Wheezy) and got 3 public IPs routed to that server. It is my aim to have multiple VMs sharing those IPs using a NAT configuration so that I can forward single ...
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2answers
64 views

Setting up a server with two NICs using two separate subnets (each on a different VLAN)

I'm using Ubuntu 14.04 (standard server install + OpenSSH, biosdevname=0 during instal to keep the network names simple) in an environment where I have two non-overlapping subnets M and N on different ...
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0answers
11 views

IPFire configuration as IDS behind router

I want to use an IPFire-Server primarily as an IDS behind an already existing router. The network's router (192.168.1.1) has access to the Internet and provides LAN-Slots for the clients. There is ...
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44 views

Load Balancing over multiple ISP connections

I have been trying to implement load balance and fail over on a linux machine having multiple interfaces. Currently I am using two ISP lines and I wish to split the network traffic such that both of ...
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24 views

IPsec - strange behavior

I have set up site-to-site ipsec connection between linux(debian) and mikrotik router. The tunnel is up linux configuration: config setup interfaces=%defaultroute keep_alive=60 ...
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2answers
295 views

Multiple ethernet interfaces

I have a two network cards, configured like this: eth0 Link encap:Ethernet HWaddr 00:19:d1:31:08:e8 inet addr:192.168.5.104 Bcast:192.168.5.255 Mask:255.255.255.0 inet6 ...
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1answer
25 views

how to connect/bridge two interfaces on different processes

I have two processes A and B (simulating real hardware device), each with their own TAP interfaces. If I want to send an ethernet packet to A, I send it on interfaceA, and similarly if I want to send ...
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1answer
38 views

link aggregation with wifi and ethernet on Linux

I have a computer running linux with a wifi and an ethernet interface. I'd like to set up link aggregation (at least fail-over, but other modes would be nice too) between these two so that both this ...
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68 views

Linux router with multiple gateways and port forwarding

I want to use a Linux VM to act as several routers at once. I have multiple servers hosting different services and dedicated public IP for each of them. Super simplified setup example: Ubuntu ...
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1answer
45 views

Keepalived load balancing MySQL. Backup server time-out

Dear beloved people at ServerFault. I'm trying (and failing) to setup a load balanced MySQL server array. Please enlighten me, show me the error in my ways. Current setup: two MySQL servers with ...
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32 views

Connectivity issues (slow response) to a remote VM via SSH

I am on a linux machine trying to Ssh into a remote Centos 6.4 server via VPN. The server often gets disconnected and response too is slow. I see the messages on the terminal once in a while: ...
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1answer
50 views

should a virtual interface clash with keepalived?

I was working on a server today, debian squeeze. After testing this on two staging servers, I added a virtual network interface to /etc/network/interfaces like this: # The primary network interface ...
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1answer
26 views

What kinds of configuration can prevent a network interface from seeing traffic?

I have two ethernet adapters on my Debian system, eth0 on my local network statically assigned to 192.168.2.1, and eth1 with a dynamic IP connected to the internet. I know this setup works, because ...
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22 views

How do I automatically advertise a preferred route via BGP using keepalived?

I have a dual firewall setup with 2 active paths to the internet. These are independent and cannot be linked together on the WAN side. It's part of a deployment at a datacentre. Each firewall has ...
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1answer
46 views

Ubuntu insufficient disk space [closed]

I am getting an insufficient disk space error, here is my df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 29G 28G 31M 100% / none 4.0K 0 4.0K 0% ...
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31 views

Printer on OS X not printing across VPN subnets

I have an interesting situation where I have a two servers that connect two subnets via a VPN. One side is 192.168.0.0/24 and the other is 192.168.1.0/24. Communications appear to be working okay. I ...
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1answer
56 views

Limit max bandwidth per IP

I have some partners, that uses one of my linux servers as a gateway. The problem is I need to limit bandwidth per client ip address on this gateway. My partners client ip ranges are not known to me. ...
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53 views

Dual WAN setup in Redhat/Centos Linux

I want to setup a Linux Server running SIP (freeswitch) applications with 3 NICs as follows: 2 of the NICs are WAN connections and the 3rd is a Private network for routing requests to other hosts on ...
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1answer
119 views

Debian up in /etc/network/interfaces not working

I'm trying to add a secondary IPv6 address to eth0 on Debian Sid. I added the following lines to /etc/network/interfaces: iface eth0 inet6 static address [IPv6 address #1] netmask 64 gateway ...
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50 views

Using my IPs on OVH server via GRE

I can't route my IPs into a OVH server, can you help me to find the problem? Mikrotik GRE IP: 192.168.55.10 OVH Server GRE IP: 192.168.55.20 GRE iface name: ali1_fr1-ovz1 IP to route from Mikrotik to ...
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22 views

stress testing a QOS switch

I need to test a network Switch that has QOS capabilities. I need to simulate a large network (preferably up to or exceeding 100 devices), and I need to do it as a live test. My requirements are: • ...
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22 views

HA router with keepalived showing unexpected traceroute

I have a couple of routers in HA using keepalived vrrp daemon under linux. Here are the addresses x.x.x.129 floating (keepalive) x.x.x.130 router1 (static) x.x.x.131 router2 (static) Something ...
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2answers
105 views

RSync stalls after 32768 bytes

I have an issue which I am struggling to understand. I have a server which is hosted by a business parter on their network but my team is responsible for installing and configuring software to this ...
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0answers
19 views

Local DHCP to setting up Nimbus cloud networking

I'm currently trying to install the Nimbus cloud in two machines (centOS 6) test environment inside the department/university network. The problem is that I can't install directly a DHCP server and ...
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1answer
106 views

Why Linux guest VMs performs better than Windows ones in terms of network?

I am testing the network performance of VMs in Xen and Hyper-V using Iperf and Netperf. In both hypervisors I found a Linux guest VM in different modes is having a relatively high performance than a ...
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60 views

Dual homed Linux host (Debian/Ubuntu) using DHCP

We have an Ubuntu server with 2 NICs. Each one is on a different subnet. Besides there's a third subnet. Clients sit on all three subnets. All clients should be able to talk to both server IPs so we ...
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1answer
30 views

What happens when a static IP address is unavailable? [closed]

I have several Raspberry Pis configured with static IP addresses (192.168.1.203 being one of them). I swapped out the router yesterday, and this router is using a different IP scheme (192.168.178.*), ...
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2answers
103 views

Corosync :: Restarting some resources after Lan connectivity issue

I am currently looking into corosync to build a two-node cluster. So, I've got it working fine, and it does what I want to do, which is: Lost connectivity between the two nodes gives the first node ...
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1answer
387 views

CentOS 6.5 proxy bypass/no_proxy not working

I am running CentOS 6.5 on my desktop. I've set the Network Proxy using the network proxy application provided under Preferences. I've also set the following exceptions: ...
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2answers
38 views

Open Specific Linux Port

Im trying to open a Port(2012) on my VPS so i can access it over the internet. This is the output of sudo iptables -L produces Chain INPUT (policy ACCEPT) target prot opt source ...
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24 views

Watchguard XTM 23 blocking company website

The company that I'm working at runs a website and 1 week ago the site started returning 404's whenever anyone tried to access it from our protected network. We immediately checked on the status with ...
0
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1answer
45 views

Linux static dhcp ip for visitor access internet without requesting MAC address? [closed]

Currently, my company internet access for visitor are required to request MAC address from them if they want to access to internet. Can we do something like the Hotel wifi? they just access to the ...
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2answers
83 views

how to get ip address of a PPP(Point-to-Point Protocol) network interface?

I have a Linux machine with two network interfaces, and I'd like to get the IP address of the PPP interface w1g1 but it doesn't show up in ifconfig. There is a public IP on the PPP interface, but ...
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63 views

Linux peer-to-peer ethernet bonding

I have two linux servers. Each have 2 ethernet ports. I connect port-to-port with straight-through ethernet cables between the 2 servers (there is no network switches involved). I want to bond the 2 ...
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1answer
105 views

Adding subnet to a vsphere with single vcenter and esxi host

Let me start of by saying that I do not specialize in networking, I am in the process of adding additional VMs to a testing environment and wanted some recommendations. In this case I am running a ...
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2answers
234 views

How can I switch from a custom linux network namespace back to the default one?

With ip netns exec you can execute a command in a custom network namespace - but is there also a way to execute a command in the default namespace? For example, after executing these two commands: ...
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40 views

Policy routing local user's traffic down a tunnel

I've got a Linux based Firewall/Router running iptables and SNAT for traffic passing through it to the Internet via a single uplink - This is working fine. There is also a small number of applications ...
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2answers
50 views

Siege - running a stress test benchmark

I need to do a benchmark test of a HTTPS server using Siege, to see how it behaves under massive load. I'm initiating tests from another machine which is quite powerful and it is connected to the same ...