Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

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336 views

OpenVPN: Run 'bridge-start' on boot before starting openvpn service (Ubuntu)

I've got OpenVPN working properly on my server, using bridge-start and bridge-stop scripts to create and remove network bridge, respectively. How do I set these scripts up to run bridge-start at boot ...
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2k views

OpenVPN resets connection repeadly

I have a OpenVPN server installed in an Amazon instance with Windows Server 2008 R2, and there's my client. First i connect to my VPN For some reason when i try to connect to my VPN server and RDP to ...
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170 views

Openstack with no fixed range

I test-drove various Openstack installations (devstack, offical guides and so on) on VM's and me&my devs love it, so we acquired the HW to set a small production cluster (3 IBM x3650, 4 ethernets ...
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2k views

Issue with Netgear GS108T Managed Switch and Jumbo Frames

I recently purchased a Netgear GS108T managed switch and I am trying to configure jumbo packets between my NAS (Thecus N4100Pro), PC and managed switch. I should mention the fact that I was able to ...
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205 views

How do I make dnsmasq serve IP addresses via IPoIB?

I have a cluster farm that I'm setting up. The nodes (computers in the farm) are connected via ethernet & IP over Infiniband. I'm needing to netboot the nodes and thought dnsmasq would fit well ...
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654 views

Clickonce applications being allowed through firewall

The company I work for uses an application that is deployed through clickonce. This means that everytime they update said program the program regenerates in a new location ie: ...
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2k views

Outbound traffic being blocked for MIP/VIPped servers (Juniper SSG5)

As we've been having some problems with sporadic packet loss, I've been preparing a replacement router (also an SSG5) for our current Juniper SSG5. I've setup the new SSG5 identically to the old one. ...
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8k views

ksoftirqd process overloads CPU with high-bandwidth and multiple network connections

I got a 10GBit Server with proxmox 2.1 installed. There's an OpenVZ container running with Ubuntu 10.04 64bit. I can get 200-300MB/sec with wget from data-center internal servers (-O /dev/null) which ...
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515 views

VMware - Broadcom 1000Gbps NIC does not link at 100Mbps to a Cisco switch port

Today we've stumbled on a very awkward situation with our VMWare Server. The server is with ESX 3.5 that has a 1Gbps NIC. We bought a brand new managed Cisco Linksys switch with 10/100Mbps interface ...
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276 views

Setting PHP remote write permissions in IIS7

I have two windows server 2008 servers. One is a web server one is a file server. A php script runs on the web server and is supposed to write to the other server. I am getting a permissions error. I ...
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679 views

Getting ipsec-tools to work between Ubuntu Lucid hosts

I have two hosts, one is Charity with IP 67.207.128.184, the other is Hope with IP 67.207.130.204. I've installed the ipsec-tools package on each host. I have not installed racoon on either host. ...
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437 views

Xen and dhcp. Not connecting

I'm sorry if this sounds like a really stupid question but I started today for the first time using Xen. I'm using it on a fresh installation of Debian Lenny. I followed this tutorial ...
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123 views

How to configure MODBUS on a Cyclades TS100?

I have a Cyclades TS100 which is used to communicate with a Modbus Slave. I selected Protocol: Modbus and configured MODBUS Serial Mode: RTU The thing is, I event don't get a connection to the Serial ...
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17 views

2 IP cameras with same configuration but different behaviour

I have a Vodafone Station router, and 2 IP cameras connected to it through an Ethernet cable. Both have the same configuration. Both DHCP enabled, one has IP 192.168.1.10 with port 81 and the other ...
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10 views

Are the i40e and ixgbe drivers really used by our Intel NICs?

We recently got two QCT 2U4Node high-density servers. Each node is equipped with a XL710 dual 40G NIC with two QSPF+ ports and two QCT mezz cards that sport Intel 82599 and dual 10G SPF+ ports for a ...
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32 views

Network traffic being automatically balanced instead of only through one interface

I have 2 servers each with 2 network cards running through two totally separate networks. One network is a public facing network and the NICs are configured with public IP's. The other network is a ...
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14 views

iptables rule limiting the number of connection in a broken pipe case

I am limiting the number of SSH connections using iptables but in case of, for example, a broken pipe (computer goes sleep mode, network problem, etc.) I am no longer able to reconnect. The rule I ...
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28 views

how could I change the IP address dynamically

I bought many IPs for my VPS machine. But I don't get how to change the IP with the interface eth0, eth1. And it seems only eth0, eth1 can be seem with ifconfig And the machine will lose connection ...
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17 views

Network outage when machine on internal ipsec secured net crashes

We have 3 machines (Debian Jessie), each having 2 network interfaces. One interface is connected to the internet, the other to an internal net which is encrypted via ipsec/racoon. One of the machines ...
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36 views

Hyper-v virtual machine acting as two separate vm's

I have a Hyper-V virtual machine (vm1) that has two separate instances of itself. I can log into what should be the same VM (vm1) through Hyper-v and RDP (Remote Desktop Connection) with the same ip ...
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28 views

R packages - Should I mount /usr/share/R/library

We have a small cluster of linux machines (~15) with up to 20 users. Over the last few years we have written a few basic R scripts for doing basic statistical analysis. The problem I have had as a ...
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25 views

Make a basic auth client authenticate on a digest auth proxy server

My company has a legacy application which needs to connect to the Internet. Unfortunately, our network staff has changed the proxy settings in order to accept digest authentication only, which this ...
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13 views

Maximum Network throughput for SWIFT storage

I have a SWIFT cluster deployed as part of Openstack which is currently giving me a max throughput of 95 MBS(Megabytes per second). There are 6 proxy servers and 6 storage nodes with replication ...
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27 views

Exchange 2010 sp3 RPC connectivity between separate physical sites

Good evening! I have installed Exchange 2010 a few times in my life but never in an environment like this. Please don't judge me for this architecture, it wasn't my idea! ;) I have two physical sites ...
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101 views

OpenVPN sndbuf and rcvbuf

I would like to know what is the difference between the sndbuf and rcvbuf buffer used by OpenVPN and net.core.w/rmem_default or net.ipv4.tcp_r/wmem. What does OpenVPN do when some value a provided ...
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22 views

debian networking lacp throughput and redundancy

I am encountering the following scenario: Physical server w/ 4 NICs and two HP ProCurve GigabitEthernet switches in a stack $Server runs debian (proxmox ve latest) I'd like to configure the network ...
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35 views

Investigating connectivity issue

I'm trying to set a up a new service on a server that is running apache, however it seems like incoming traffic on that specific port is blocked, although I do not understand why. On the first server, ...
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83 views

Setting up a caching system r/w in DCs across continents

We are going to implement a caching system to make our front-end servers which are located in different data centres in Asia, America and Europe can read and write some small JSON data in the shortest ...
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47 views

Datastores Occasionally Disappear on vSphere Client

I'm currently running several virtual servers and connecting to the vCenter using the vSphere Windows client. We're connecting with to a datastore on another server which has a separate folder for ...
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18 views

Can't connect to selenium grid on VM?

I have a VM on the same network as my computer. I can remote into the VM and open up the selenium grid console (http://(ip):4444/grid/console) and it appears to be working fine. When I try to open ...
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41 views

How to connect to two different internal networks at the same time

I am still new at this, so please be gentle. My company recently got our accounting department a small Cisco 877W router so that they can connect to the Internet via DSL. The 877W is setup with DHCP ...
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68 views

Change source address based on destination IP: NAT or routing?

I have a router/host with multiple public IP addresses. I want to change the source ip depending on some destination addresses. This has already been asked here: If the traffic originates from some ...
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13 views

Cannot Ping DC with expanded scope

i have inherited a network and do not know how to find the culprit here is the setup 1. Server 2008R2 with DHCP 2. 2 nics, 192.168.1.6 Static, 192.168.2.254 nic 2 3. Subnet 255.255.0.0 4. Scope is ...
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53 views

Linux: Same static IP configured for all NICs

I am shipping some servers out to remote colo sites. I want to configure them so at the other end any port can be lit-up and the boxes will be good to go. I had originally been planning on bonding ...
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73 views

kvm guest routing with 2 default gateways

I have a kvm guest with two virtual NIC. NIC with internal IP III.III.III.III (eth0) NIC with external IP EEE.EEE.EEE.EEE(eth1) I'm using macvtap. The host has his own external IP. I can ping ...
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23 views

Routing is disabled for LAN users while choosing all-net for IPSec tunnel

I have VPN with L2TP/IPSec server and tunnel configured. When I choose all-nets 0.0.0.0/0 to allow connection from any computer in the world, all LAN users with subnet 10.0.0.0/8 are disconnected from ...
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56 views

socat TCP file server

I'm trying to set up a simple socat fileserver using TCP to send small files (~100KB). Here are the one-line servers and client for one file: Server: socat -u -d -d OPEN:file.dat ...
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21 views

Load balance 2 wireless adapters on 2 different computers (ie. w/NLB)

I have 2 physical servers running 2012R2. Each box has its own wireless nic. I also have 1 SSID to which both servers/WLANs connect to. While trying to setup NLB, I noticed the Wireless NICs didn't ...
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49 views

Connecting 2 sections of a guest network using a pair of layer 3 switches

I have 2 subnets, these are physical sites which are connected with a point-to-point fibre link, 10.0.0.0/16 is our main site with our main gateway, 10.2.0.0/16 is the second site which sends all ...
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54 views

DNS not working with Ipv6

I'm trying to configure bind for ipv6 protocol.I have added the entries to the zone and configuration files but still the ipv6 IPs are not returned when i try for nslookup.Can someone guide me to ...
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48 views

How to set up a simple Cisco ISG config for controlling internet access

First off, here is my config so far. http://pastebin.com/fV2NGCE2 I've gone through a few guides online and the 15.2s manual and the xe3 manual for Cisco's ISG (intelligent services gateway) and ...
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73 views

Xen: network between dom0 and domU does not working, while network between particular domUs does

I am unable to establish communication between domU and dom0. I have two domUs and they are able communicate between each other. Dom0 is connected to Internet. I just need network between dom0 and ...
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68 views

Can't connect to Windows Server 2012 Virtual Machine in Red Hat 6

I have installed a WS2012R2 virtual machine using KVM on Red Hat, It has a bridge connection, Both (Host and Guest) have public IP addresses, both have internet access, both can ping any ip address or ...
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92 views

Firebox x700 Reset to Default Not Working

I found a site that explains how to reset a Firebox 700 series back to default as you can see from this link: https://www.hashdoc.com/documents/7502/how-to-default-a-watchguard-firebox-700-or-x700 ...
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36 views

Run application from network drive takes long

This problem started recently, and I wasn't able to find a solution. Not even formatting solved. We have a program on our network drive and the Whole company accesses to this single exe. Usually the ...
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485 views

Event id 4227 tcp/ip warnings on Windows 7

We're deploying a new image out to the field, and we're seeing tcp/ip event id 4227 warnings periodically throughout the day (1-3 a day). The event message reads as follows: TCP/IP failed to ...
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187 views

Automounted AFP home directories are owned by root (OS X Yosemite client, Linux Servers)

What I am trying to do but can't get to work I am trying to set up network users in Yosemite clients with their home directories on kerberised AFP. I am using automountd to have the home directories ...
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29 views

Direct Access Stacking network filter driver before iphttpsinterface

Is there any way I can stack up my NDIS filter driver on top of iphttpsinterface, which is a virtual tunnel adapter provided by Microsoft for Direct Access. With this, I would like network traffic ...
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168 views

Trunk vlans inside openvz container (Proxmox)

I have a node running OpenVZ CT (ProxMox). eth1 on HN are bridged through vmbr1 to veth device on CT101 (eth1 inside container). (Host Node) eth1 -> vmbr1 <- veth101.1 <- eth1 (CT101) No ...
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63 views

Kernel panic under DDOS

I'm running a Debian 6 - 64bit system (Kernel 2.6.32-5-amd64) and often get flooded with DDOS. I have tuned the network parameters under /etc/sysctl.conf to not let any kernel parameter overflow. ...