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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Using comercial nfs app on windows 7, getting 1/6th speed of SMB/CIFS

The nfs3 server is running Omni-NFS on windows 7. Clients are Ubuntu Linux, when I test speed by transferring 100mb file, I get 95MB/s using SMB/CIFS, but only 15MB/s using nfs. I have tried every ...
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2answers
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Creating Virtual Proxy Server

I know this is not this kind of forum, but I can't find anything in google that really answers my question. Is there possible to create a Proxy server running in a Virtual Machine using only 1 ...
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16 views

Networking Linux kernel [on hold]

I m writing a code where a packet is dev_queue_xmit(). Just before xmit, I want to know whenever my interface is down. I don't want to add any event driven function for this to make my kernel code cpu ...
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20 views

docker0 bridge status toggles between enabled/disabled, what could be causing that?

I have some CoreOS bare metal instances that are displaying unusual behaviour on the docker0 bridge device. On one of the instances where this has been occurring, I'm running couchbase server and it ...
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1answer
23 views

port forward in INPUT level

I want to change the destination port of the ipv6 packet in the INPUT level. So I tried to use ip6tables with nat in the INPUT level but seems this command does not work # ip6tables -t nat -I INPUT ...
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16 views

home network bridge + access point [migrated]

I want to create a wired bridge to a wifi setup a firewall + intrusion detection and then setup a wifi-access point for lan-out I currently have a d-link 1200 extender setup as bridge, my desktop ...
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1answer
25 views

AutoFS mount multiple CIFS Shares to same directory

As long as I had only one mount everything was fine. file: /etc/auto.master /mnt /etc/auto.srv1_share1 file: /etc/auto.srv1_share1 sh1 -fstype=cifs,rw,user=jdoe,domain=srv1,noexec,password=xxx ...
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0answers
21 views

What's the best way to create a captive portal access point if my authentication is on a website?

I have my access point set up with dnsmasq and hostapd. Hostapd supports authentication but it is local authentication. I need the user to be limited to a specific login URL, where once they hit the ...
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1answer
32 views

dual-homed Centos 7 cannot be ping'd or ssh'd from some on LAN, sees ssh connection refused on one subnet

I have 2 subnets, A and B and a router connected to both A and B and the WAN. I have 4 servers dual homed on subnets A and B, 2 of them are Mac OS and 2 of them are Centos 7 (1503). They are all ...
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0answers
44 views

IP-rules don't seem to be working on CentOS-6.6

I faced a bit odd difficulty with policy-based routing on CentOS-6.6 server. I have a setup where I need to enroute all packets originated from 172.25.0.0/16 destinated to 172.24.0.0/16 and some ...
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2answers
60 views

Port 22 is accepting connections, but not visible in netstat, unhide etc

So I have this weird issue where one of my boxes is accepting connection on the ssh port (22) even after sshd is stopped. I tried to identify the listening process by the typical means sudo netstat ...
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1answer
13 views

Upgrading Web Application's Systems' Kernels for IW10 & other related improvements - upgrade all machines? LB first? Most important?

Stackers - We're making the push to upgrade the systems for our web app to take advantage of the various TCP improvements becoming more readily available (e.g. ...
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0answers
33 views

Is there a way to write the ip-address of an interface to a file when it comes up? [migrated]

I'm looking for a way to trigger writing the IP address of a host to the file /etc/environment once the networking is up. Right now, all my IP's are static. I'd like in future for them to be DHCP as ...
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1answer
24 views

Running OpenVPN on Xen node causes guest VM to view all inbound connections as originating from the node IP

I have two node servers running Xen 4.2 -- I'll call them Node A and Node B. Node A is running OpenVPN as the server. Node B is running OpenVPN as the client. Both nodes host a number of Xen guest ...
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4answers
748 views

Transfer large amount of small files

I've to do a migration of two servers with large SAN attachments to our new VMWare environment. EDIT: I have to supply some additional intelligence as I have good answers regarding VMWare solution. ...
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1answer
63 views

Route traffic through private IP for only certain hosts - CentOS 6.6

I am having a weird problem which I cant figure out - so I was hoping someone here could give me a hand. First off the end goal is that a specific server in my network runs an IPSEC connection to ...
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0answers
25 views

SNMP agent configuration windows/linux [migrated]

i need to retrieve information via snmp and then use this information to create some sort of graphic application in Unity. I find the SnmpSharp library http://www.snmpsharpnet.com/ i create a little ...
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1answer
163 views

Update version of network manager

In shell on sever I see following error after launching several commands: Error: nmcli (1.0.0) and NetworkManager (0.9.9.1) versions don't match. Force execution using --nocheck, but the results are ...
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1answer
24 views

Allowing all ports from an IP

I have successfully entered the following command to iptables sudo iptables -I INPUT -p tcp --dport 5000:5020 -j ACCEPT -m comment --comment "Allow Ports 5000s" However, AFAIK this allows access to ...
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0answers
21 views

How to automatically remount iscsi drive, after network errors on Vmware + FreeNAS

Is it possible to force Ubuntu to remount, rescan storage in time manner, to automatically mount it in rw mode? I have a Ubuntu virtual machine on VMware server. And have physical FreeNAS server ...
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40 views

KVM port-forwarding from ppp0 to VM's bridged NIC not working, but to VM's NAT NIC works?

I've spent a lot of time on this freaky problem, I've created a simple host and VM configuration to try isolate the problem. Terminology in this question Host: The bare metal server VM: The KVM ...
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0answers
31 views

How to setup 2 switch with VLAN and 2 IPs for each in different block

Below I have depicted the required network. In this network: Lets say GW1 is in IP1 block and GW2 is in IP2 block. There are 2 Linux running PCs with 4 NICs. 1st Linux PC is connected to 2 GWs with ...
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27 views

How can i configure a static ipv6-prefix to one linux host [duplicate]

I have a virtual Linux server (Kubuntu 14.04) and i will ask the hosting provider for a complete /64-Prefix for this machine (at the moment i have 4 individual IPv6-Addresses). How do i configure the ...
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1answer
30 views

Cater to multiple countries? [closed]

I run a game server off a linux machine with a single IP address masked by a proxy. The box is located in an LA datacenter, and for players in some other countries, they experience a high ping ...
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21 views

dnsmasq - resolve all domains, including path, to the same address

I'm trying to setup a captive portal with a dnsmasq to resolve all domains to an internal IP address. My /etc/dnsmasq.conf: interface=wlan0 dhcp-range=10.0.0.2,10.0.0.10,255.255.255.0,12h ...
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1answer
32 views

Why must the IP be configured on the bridge device? [closed]

My understanding of a network bridge is having a kind of "virtual switch" which virtually connects the network devices (that were added to the bridge) as if I would connect them to a real switch with ...
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1answer
58 views

Debian - Routing multiple virtual interfaces

I've a Debian computer with multiple external IPs (7 in total), each IP has its own virtual interface (eth0:1,eth0:2, etc...) I would like to know: how can I configure routing so each time I ssh to a ...
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3answers
163 views

Iptables rules with ! character

I have entered iptables rules to log a specific connection on our server, but it doesn't seem to be working as I want it to. Here are the rules: 1 LOG tcp -- !10.51.0.0/16 ...
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0answers
25 views

Routing private IPv4 addresses internally

I have the following set-up involving two KVM hosts and numerous virtual machine guests on each. The guests communicate to each other on both hosts via [192.168.216.0/24]. [192.168.216.42] is ...
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Openvpn stops responding [migrated]

I've been trying to set up openvpn with a vps and raspberry pi. The raspi is natted while the vps is public. I've tried connecting to the openvpn from mint laptop as well, but it's no use: Server ...
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30 views

Deny DHCP-Requests for specific subnets on specific interfaces [migrated]

I have a router (Ubuntu 14.04) running the isc-dhcpd-server on the interfaces em2.X (X can be any of the VLANs 2, 3, 4). Each interface has its own 192.168.X.0/24 subnet. Now I have a Windows-Client ...
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2answers
33 views

arp table entry outside configured network

Can someone tell me why do I have arp table entry outside interface network? Server has 2 interfaces, both on the same network: eth0 10.10.34.146/22 eth1 10.10.33.188/22 ip route default via ...
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2answers
52 views

Http Requests: how to identify a machine using multiple IP addresses

I have an http server. Is it possible to identify a machine, which is making http requests to my http server using different IP addresses? In other words, is it possible to identify a machine, by ...
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1answer
57 views

Cannot Access remote CentOS machine using VNC

I am trying to connect to a remote CentOs machine through VNC to get a graphical display. I have followed the steps mentioned in https://www.howtoforge.com/vnc-server-installation-centos-6.5 to ...
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2answers
80 views

Linux Red-hat 6 Network manger interface priority

I have a question regarding RedHat 6 Enterprise Network Manager (NM): My Linux is connected to two network interfaces. 1 – eth0: Normal Ethernet which is connected to the company LAN 2 – eth1: An ...
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0answers
22 views

Ubuntu DHCP-RELAY Error

I have a Ubuntu 14.04 server running as a router (4 NICs with IP forwarding turned on). The routing/forwarding component is working fine. However, I now wish to implement a DHCP-Relay/IP helper so I ...
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18 views

iptables, after specifying an interface to drop traffic it drops all traffic of all interfaces

We have currently the situation that one interface (eth0) is linked to the internet. and we 2 other devices (eth1/eth2) for management purposes. Now the idea is to block off eth0 completely from the ...
2
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1answer
31 views

Virtual interfaces with different MAC addresses

I try to figure out how to set up two logical network interfaces (at one physical interface) with separate MAC addresses on a Linux machine. My first attempt was to use macvlan which seemed to work ...
0
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1answer
49 views

Adding a VLAN to Multiple Aliased (Virtual) Interfaces

I have a server running centOS 4.6 with 4 NIC ports. I successfully set up 2 ports with 32 virtual interfaces to handle my VLAN-untagged connections and have no issues with that side of things. ...
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4answers
70 views

Linux-Networking: How do I get routing to work with two network interfaces on the same subnet? [closed]

I have a Ubuntu machine with ip_forwarding enabled. iptables forwards too. I have 3 network cards. eth0 - internet eth1 - client1 eth2 - client2 I want eth1 and eth2 to be on the same subnet, ...
0
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1answer
48 views

how to change the ftp passive mode ip address for haproxy work as reserve proxy?

I have an ftp server in LAN, address is 192.168.1.11 I used haproxy is because lots of other service need it I put haproxy on my 192.168.1.1 the same machine of our soft-route(ubuntu 14.04) My ...
0
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1answer
45 views

Why is port 443 (but not port 80) being exposed to nmap when iptables is configured to drop the traffic?

A Debian box is running web services on ports 80 and 443 and iptables is configured to allow web traffic only from white listed ip addresses. A second Debian box (that is not white listed) is using ...
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1answer
49 views

IP Forwarding Issue

This is my first post, so thanks in advance for y'all's help. I'll try to keep the background succinct and relevant. I am running a server on centOS 4.6 for network client testing. I have the local ...
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56 views

How to deploy single OpenVPN server instance with multiple unique “--config server*.conf” profiles?

How to deploy Single OpenVPN server instance with Multiple unique --config server*.conf profiles as service start|restart parameter ? Would you please share any tips to run one single Openvpn server ...
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2answers
64 views

How to configure network interfaces for three NIC cards all on three different subnets

I am setting up a cloud environment on Ubuntu and I am running into an interesting problem. Out of the box Ubuntu (all linux really) doesn't allow you to specify more than one gateway in ...
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1answer
85 views

Reverse zone not working with BIND9

I'm trying to configure a DNS server in UBUNTU 12.04 with BIND9 service.I'm able to successfully configure the same and the when I'm executing nslookup command it works well.However,the host command ...
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0answers
28 views

Setting up LDAP to authenticate users in data center

I'm a newbie to linux and networking. Somehow I'm assigned to research the tasks of setting up the authentication for users to login in from local office to data center. Here's the hypothetical ...
2
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0answers
55 views

When is route lookup performed when a packet flows through iptables?

Iptables is often illustrated using diagram I fail to understand when route lookup (routing tables) is performed: inside the "Routing Decision" grey boxes? If so, does it mean a packet is routed ...
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2answers
44 views

How to use a server as a “tunnel” in between the clients and the router, in a small network?

Consider a small network with 1 router (192.168.1.1) and clients (192.168.1.x). The router (OpenWRT) provides Ethernet LAN and WiFi for the clients, to connect to the Internet. Now, I want to use a ...
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34 views

CPU usage of server extremely low and webpage load time high?

On a weekday at a time where very few use the optimized website on the server, the time for the page to completely load excluding 3rd party advertisements is about 0.6 seconds to 1 second. Now when a ...