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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How to change mode from manged to monitor on mon0 interface on NIC?

I am connecting to a home router using wifi. The detais of my wireless cards are as follows: #lspci 01:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01) #lspci -vv ...
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1answer
102 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
13 views

Hosts cannot ping in two name spaces using Open Vswitch

I have two name spaces red and blue. Red is connected to host1, and blue is connected to host2, but these two hosts cannot ping each other. Here is the commands that I put: ip link add host1 type ...
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15 views

how to use public ip in my private network [migrated]

I'm trying to use public IP address in my private network. In a short, how to set public IP, which is different to endpoint IP of my private network, to my server in my private network? Is other ...
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2answers
39 views

Port forward with iptables

I got lo (127.0.0.1) and eth0 (172.17.0.8). I want to redirect packets that land on 127.0.0.1:80 to 172.17.42.1:80 (route from eth0). I tried iptables -t nat -A OUTPUT -p tcp --dport 80 -d 127.0.0.1 ...
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4 views

linux: how to troubleshoot forwarded port? [migrated]

My home internet connection has a static IP address (eg: 123.123.123.123) I have configured my router to forward port 9000 to an internal host (192.168.1.101). That host is running Ubuntu 14-04. ...
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2answers
48 views

Add a VLAN tag to specific UDP port traffic

I'm running an application in Ubuntu12.04 that I've written that does some remote switch management. I have only a single NIC connected to the network of managed switches, eth0 which is set with IPv4 ...
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8 views

OpenVPN Client recieves reply from Ping to Server but not from eth0 or non-server IP

I have been using OpenVPN succesfully with Layer2 bonding for over a year now. I have been experimenting with a more complicated setup on the local LAN using a ProxmoxVE hosting KVM VM as the server ...
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2answers
1k views

Untangle VPN setup, how to see internal addresses?

So Untangle is setup as the default gateway at 192.168.100.1/24, it is the authorative DHCP server issuing addresses from 192.168.100.100 to 192.168.100.200 and is successfully connected to the ...
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1answer
23 views

Cannot Ping Devices Across Interfaces for Shorewall Single IP Three-interface Firewall on Debian Wheezy

Summary I am currently working on a three interface software firewall using Shorewall 4.5.5.3 on Debian Wheezy, and I'm having some difficulty with the loc (eth2) and dmz (eth1) interfaces. The fw ...
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1answer
19 views

How to route an IP Whitelist to one VM and all other to a second VM on proxmox?

Is it possible on linux to have a whitelist of IP's that are allowed to reach a specific VM on the internal NAT? eg (public ip (proxmox) --> My VM for whitelisted IP's (192.168.0.1)), and if the ...
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3 views

Execute script on ipv6 prefix change [migrated]

How can I execute a script or program whenever my (world-routeable) IPv6 prefix changes? If there is (currently) no easy way to do this, a pointer to the corresponding Posix system calls would be ...
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1answer
814 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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2answers
132 views

OpenVPN Route Client Traffic Through VPN Server Tunnel

I have configured a vps following this tutorial, the server and client are successfully connected and can ping each other, server is at 10.8.0.1 and the connected client (android-OpenVPN Connect) get ...
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1answer
30 views

why linux bridge shows 2 mac addresses for one qemu vm?

I am new to qemu networking and pretty confused about the following situation. I launched 5 VMs. Each connects to br0 through a tap device. I also have a dnsmasq listening on br0 for DHCP. The ...
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1answer
88 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
34 views

Mount a SFTP remote filesystem that doesn't give shell access

I have a NAS that exposes its filesystem as SFTP, but it doesn't give any access to connect throught SSH as a normal user. I've tried to use sshfs to mount it from a remote webserver, but I receive ...
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29 views

LXC container clone has no network and SSH stopped

I was having this networking problem with LXC containers (question and answer here:bridging LXC containers to host network with different IP range) and if I have found a solution, I still have not ...
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83 views

VMs on ESXi system, only able to use internal IPs

first off I am a bit of a network newb, I know the basics but that is about it. So I have a ESXi server running a few VMs. The set up is; -Master IP (controls the ESXi box) -Internet IP (for general ...
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0answers
5 views

Packet forwarding for guest VMs not working [migrated]

I'm am running some VMWare Fusion VMs on OS X, and I'm having trouble with networking. OS X has a Wifi interface with two IP addresses: en0: ...
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1answer
16 views

How to change the ip range used for an IPCOP network interface

I am using IPCOP v2.1 I currently have a blue network with the range 192.168.0.0/23. I would like to change it to use 192.168.200.0/23. Is there a way to simply make the change, or am I required to ...
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1answer
27 views

Most outgoing connections blocked (kind of?)

I have a server which I upgraded from Ubuntu 12.04 to 14.04. Now I have some extremely strange behaviour (which I believe was not present immediately after the upgrade, but can't be sure): I can't (by ...
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1answer
26 views

rcp files from windows 2008 server to linux box? (Running rcp on linux)

I am trying to run rcp command on rhel6 server to copy over files from a windows 2008 server but see this error message. /usr/bin/rcp administrator@10.225.185.112:"C:\nfsqa-rhel62-vm01.root.keytab" ...
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35 views

How to route traffic through different interfaces based on the port number?

iptables -A PREROUTING -i usb0 -t mangle -p tcp --dport 8080 -j MARK --set-mark 1 iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain ...
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5answers
5k views

Override DHCP hostname on RHEL5/CentOS/Amazon Linux

I'm running Amazon Linux (based on RHEL5) on EC2. I have my own domain name pointing to the instance's elastic IP. Amazon auto-assigns the instance a generic (and not visible on the Internet) ...
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1answer
33 views

Temporarily block communication with host if its connecting to port X

I have a Linux VPS, and it's constantly being scanned, bruteforced by some rogue IPs. This VPS is my private server, that serves only to me, and I'm the only user of it. Also I am the only user who ...
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1answer
2k 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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2answers
36 views

How to forward traffic to different nics based on source?

I'm a newbie to IPtables, but am looking to do send traffic to a specific card based on the source. Here's what I would like: eth0 - all traffic comes in on this NIC Depending on the source IP, I ...
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1answer
39 views

Linux router: User friendly, web-based traffic monitor app [closed]

This is not a tech question but I hope someone can help me out. I've been searching all over the web for an app like this, but I can't seem to find one: Friendly user interface where a non-technical ...
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1answer
2k views

Diagnosing packet loss / high latency in Ubuntu

We have a Linux box (Ubuntu 12.04) running Nginx (1.5.2), which acts as a reverse proxy/load balancer to some Tornado and Apache hosts. The upstream servers are physically and logically close (same ...
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11 views

allow double tagging on vlan interface

I have a single interface eth0 on my machine. I have a linux bridge to which If I add my interface I loose connectivity. So I create a vlan interface and add it to the bridge. All is fine now except ...
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1answer
24 views

ip route command with source option

I have multiple interfaces on my system catering to different subnets. I also have a pseudo interface which is a p-to-p driver for tunneling packets. I was trying to add routes using ip route command ...
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0answers
18 views

Linux: Reduce UDP Packets Error

I'm facing UDP packet receive errors (under Linux 'netstat -su' command). I have 10 x UDP processes running on Machine-A (RHEL 5.2) and each of them send 290-byte packet at 50 times per second to ...
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Why is ping resolving to an IP 198.105.254.228 for any random hostname that i type? [migrated]

I have a precise32 (ubuntu 12.04) vagrant vm running on my system. If i try to ping a random string, eg ping "thisip.doesnot" it resolves to an IP 198.105.254.228 . This is try for any other random ...
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2answers
71 views

DNS points to the right IP, but I can't connect using DNS

UPDATE: This is now strictly a local problem, connecting remotely works (a dumb mistake I made.) I think it's now it's a loopback issue, which is a different issue, and likely answered in another ...
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4answers
3k views

How to persist ethtool settings through reboot

I would like to turn off tcp segmentation offload on a CentOS5 server. Using ethtool the command is ethtool -K eth0 tso off However, this setting only persists for this session. How can I make it ...
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1answer
35 views

How to achieve stateful fail over when using multiple uplinks?

I have multiple ISP lines over which I am load balancing the network traffic on my linux machine having multiple interfaces ( eth0, eth1 ,eth2, eth3) . This I am doing by creating the routing tables ...
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1answer
36 views

Debian port(s) not responding

I am fairly new to servers. I am trying to run a shoutcast server on debian. Shoutcast runs on a default port of 8000. My problem is it will not load when visiting xxx.xxx.xx.xxx:8000. When I log in ...
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16 views

Fail over in Lokiwall Firewall

I have configured lokiwall firewall on my linux machine having multiple interfaces. Dual Routing works fine. However, I wanted to know how does the fail over happen in case a link goes down. Do the ...
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1answer
47 views

bacula backups very slow with TCP socket in 'unkn-4' state

Several bacula-fd clients are backing up to one bacula SD (using 2G disk files on massive RAID, not tape), usually 2-3 of them concurrently. It works fine, except when 2 bigger clients (about ...
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3answers
323 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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2answers
78 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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0answers
36 views

Separate L2TP/IPsec VPNs with dynamic VLAN assignment

I am working on a Linux (Debian 7) VPN concentrator for different kinds of remote access. One of the offered protocols is L2TP/IPsec because of the client availability. I am using xl2tpd which in turn ...
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Disable autoconfiguration of new network interface on Linux

I am running Ubuntu Linux and whenever I insert an external network card to my computer, it automatically creates a new interface (that is okay) but also instantly giving the interface an IP address. ...
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2answers
81 views

Telnet client on redhat linux

I am trying to install a telnet client in Red hat linux server which doesn't have internet connectivity. Red hat linux version less /etc/redhat-release Red Hat Enterprise Linux Server release 6.4 ...
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1answer
33 views

iptables destination NAT from one range to another

I am trying to make destination NAT from one range (192.168.2.0/24) to corresponding ip addresses in another range (192.168.1.0/24). I have managed to do this ip by ip iptables -t nat -A PREROUTING ...
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2answers
1k views

How to route broadcast packets from machine with two network interfaces on same subnet

I run RHEL 5 and have two NICs on one machine connected to the same subnet: eth0 192.168.100.10 eth1 192.168.100.11 My application needs to receive and transmit UDP packets (both unicast ...
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1answer
8k views

sudo ifconfig eth0 192.168.1.7 netmask 255.255.255.0 not permanent

I have two PC's and a series of Juniper EX-2200 switches connected to form a network.None of the devices are connected to any external network.If I do an ifconfig on the first PC (monitor) I see that ...
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1answer
76 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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54 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 ...