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

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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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443 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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206 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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219 views

Why I get different network traffic values from dom0 and from domU?

I'm using Xen 4.0.1 with Linux 2.6.32-5-xen-amd64 (standard packages on a Debian Squeeze system). From Xen Networking: For each new domU, Xen creates a new pair of "connected virtual ethernet ...
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3k views

Why can't I connect on port 445?

I need to collect baseline performance data on a SQL Server running on Windows Server 2008 R2. When I open perfmon on my computer running Windows 7 and try to add counters from the remote server, I ...
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2k views

Testing radius server from Mac OS X client

I have a radius server set up on a server running Ubuntu 11.04. I have configured my switch to use the authentication server's IP (192.168.1.2) for RADIUS / 802.1x authentication, and I created a ...
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556 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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414 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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112 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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19 views

how multicast stream passes when receiving locally

If suppose I have TX application which transmits UDP multicast to 239.0.0.1:1234. And I have RX application which joins multicast (239.0.0.1:1234), and receives this multicast (239.0.0.1:1234). I ...
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60 views
+50

CoreOS bare-metal vlan networking

I need to write a CoreOS Cloud Config file in which I need to setup networking. But i have a problem because I have a bit weird environment. What I'm trying to accomplish; I have a Sophos UTM thats ...
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45 views

linux not replying to an arp request

I am running linux 3.14 on a system with 2 interfaces. on the first interface, i can access our local network. on the second interface, arp packets come in but linux doesn't send out reply. is it ...
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35 views

openvpn rdp networking mystery : can connect HTTP cannot RDP, even with firewall off

I have 2 small networks joined using OpenVpn (routed configuration), lets call them A and B. on A, I have a test web server (IIS, Windows 2008R2 or Windows 2012 depending on test machine), lets call ...
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35 views

DFSR speed Server 2008r2

So, here’s the simple setup: 2 sites, each with their own file server (server standard 2008r2 fully updated) 100MB WAN link at each site 1.7TB shared drive Replication schedule 64Mbps at night and ...
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30 views

VMs with same name an IP

Does Foreman support managing several VMs with same name and IPs, but with different certname? for example: NAME IP CertName VMLinux001 10.0.0.2 VMLinux001@domain.com ...
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60 views

Limit ESXi guests to one public ip

I've been scratching my head on this issue the past few weeks. I've been searching but can't find the answer I want. Maybe I'm just bad at searching though. In any case, any feedback on this issue is ...
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43 views

Route traffic for a specific IP through a specific interface

I'm setting up a server that tunnels all its traffic over an OpenVPN connection. The VPN connection is further tunnelled over obfsproxy hosted on the same machine. The problem is that as soon as the ...
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116 views

Ping connected Clients to VPN tunnel PPTP

I have set up a vpn server on CentOS 6 (PPTP) following this guide... Server End ifconfig ppp0 Link encap:Point-to-Point Protocol inet addr:192.168.1.15 P-t-P:192.168.1.200 ...
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12 views

IGMP Snooping limitations and when do you start to use PIM?

At a head end I've just inherited, all our multicast streams run on cisco switches with IGMP snooping enabled. Because all these streams are to be kept local and isolated we've never really looked ...
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54 views

Why does my server gets requests for domains that are not mapped to my IP

As title states ... Why does my server (nginx) gets requests for domains that are not mapped to my IP? I've split my nginx logs to create a log file for each website that it processes and i've ...
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19 views

VM LAB - Promiscuous mode clarification

So for clarification I am running a Lab within VMware behind OpenVPN, 1 NIC with direct internet access (WAN vswitch) and another NIC with a leg inside a LAN vswitch. (This obviously houses my VM's ...
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31 views

Xen VM could not be installed

I have rented a server from Hetzner. I have installed Xen on Dom 0 - Centos 6.5. I couldn't create a Dom1 Centos 6.5 VM. The Error I see is 'Unable to retrieve 'the link for centos image' while ...
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27 views

Dell PE2900 seeing only 1/2 ethernet controller

I have 2 ethernet controller on my dell poweredge 2900 : http://www.dell.com/downloads/emea/products/pedge/en/pe2900_Spec_Sheet_Quad.pdf But I only see one on my linux system : $ ip addr 1: lo: ...
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110 views

How to create a link between GNS3 and a VMWare Workstation VM that is totally isolated from the physical host?

My physical host machine runs windows server 2012 R2 with a DHCP server. I have the following topology in GNS3: Windows Server is the physical machine, it is connected to both VMNet 2 and VMNet 3 ...
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98 views

Hyper-V VMs keep losing network connection

We had a major power loss in our server room two days ago and several Cisco Nexus 2232PP FEX devices went down. We were able to get everything back online, but since that event we've been experiencing ...
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39 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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40 views

Receive many UDP packets & ksoftirqd load

I want my server to be able to handle more than 1Mpps from a 10g card. Is it possible? I have Ubuntu 14.04 with kernel 3.11 and a 16 core Xeon machine. It seems that ksoftirqd becomes bottleneck in ...
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80 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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36 views

Using a G. 655 with a G. 652.D fiber cable?

Is it possible to use a G.652.D patch cord with a G.655 fiber cable for just a small distance (less than 10 m) for the interconnect only (from the patch panel to the switch) ? If yes or no, what will ...
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60 views

two different ping results to the same machine, what does this mean?

I am trying to track down a network or possibly server issue, and I opened a ping to the server from my machine. I will generally receive a <1ms response for a period of time, say 10+ minutes. ...
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35 views

Most secure way to encrypt critical data to be shared, edited and seen (must ALWAYS be secure)

This question does not rely on time... so it's not about keeping data on tape or anything similar. I have 3 distinct PCs with critical information. PCs are running Windows OS. They all hold critical ...
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114 views

How to access the setup wizard on Sonicwall TZ 100 firewall

I am trying to setup a TZ 100 firewall. I am following these instructions and I have attempted to follow these instructions: "Connect your computer to the LAN (X0) port on the SonicWALL. Connect an ...
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59 views

TCP Window Size Allocation, TCP Window Zero Errors and Network Latency

My mind is about to explode as everyone is always blaming the network guys for disconnections and slowness in the networks, but Solarwinds Reports that all utilization in the network devices and links ...
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88 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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524 views

TPROXY Not working with HAProxy, Ubuntu 14.04

I'm trying to use HAProxy as a fully transparent proxy using TPROXY in Ubuntu 14.04. HAProxy will be setup on the first server with eth0 111.111.250.250 and eth1 10.111.128.134. The single balanced ...
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44 views

Measuring latency with switch and identifying flow path

I have two machines, A and B, connected via switch S1(master) and s2(slave). I want to measure latency and identify packet flow path from machine A to Switch,switch to machine B. If the link between ...
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850 views

Ubuntu 14.04 KVM Host - Only network device pcnet working

I've installed a KVM host on Ubuntu 14.04. I've added a networking bridge as br0 and also added the p4p1 network adapter to it. My problem is now that only the "pcnet" networking guest driver is ...
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146 views

Command to set dscp / ToS value on outgoing packets for OS X Mavericks?

I want to set a certain DSCP (or ToS) value on all packets sent over port 22. I have an iptables command to do so, but Mavericks only has the equivalent of pfctl and I can't figure out how to ...
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170 views

Network Performance / SMB-CIFS / Guidance

I'm an IT professional working out of my home office. I'm having some performance problems (NAS file copies) which I'm trying to isolate, using iperf. My question is on iperf. Infrastructure - ...
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27 views

Windows DHCP MAC-Range to Scope allocation

I wonder if there is any options to map a specific Range of MAC addresses to a specific DHCP address scope. The thing is, I want a specific scope for address allocation to bridged Virtual Machines ...
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84 views

trying to reach a port forwarded server from the subnet using the public IP not working

I set up a server which is connected to my router. The router forwards a port of my server. So when I scan that port using http://www.t1shopper.com/tools/port-scan/ I got: 188.143.126.14 is ...
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67 views

Binding ISC DHCPD to a virtual (heartbeat) interface

I had a DHCP server that acted as a relay endpoint and worked fine. let's say this is a solo machine with eth0 with an ip of 192.168.0.10 I needed to bring this server down and join it to a cluster, ...
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36 views

Adding old T1s to a new configuration

As embarrassing as it is, my facility is running on two T1 lines. One connects us to AT&T and the other connects us directly to our corporate facility. This is a mirror of an old system we once ...
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81 views

HP ConnectX cards identifying as ConnectX EN

I bought a lot of four HP branded ConnectX card on Ebay. The cards are : HP InfiniBand 4X DDR ConnectX PCI-E Gen2 Dual-Port HCA 483514-B2 My problem is that two out of four cards identify themselves ...
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upstream timed out (110: Connection timed out) while connecting to upstream

I have my backend in France and one of my frontend servers is in Japan. This issue doesn't happen with any other of my frontends, only this Japan server, which already has about 2s latency from most ...
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86 views

Redundant Debian Gateway

I have to configure a redundant gateway with Debian boxes and I would like to get some recommendation what's the best solution in my case. There are certain limitations in my setup and I have to go ...
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53 views

How to view network resources used by a thread in Linux

I am trying to check the network resources used by a thread but unable to figure out how. lsof only allows us to give the pid. I checked under /proc/pid/task/thread/ but could not find anything ...
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179 views

Network share folder not accessible on one machine

I have a network file share folder available from one server on the network (running Zentyal 3.4/Ubuntu 13.10). I can access that shared folder from all of the computers on the network, except for ...
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50 views

Cisco RV016 dual WAN and VPN setup

I have a VPN of several RV016 routers and I want to set some of them with 2 ISPs. I plug the two ISP cables in WAN 1 and 2 ports and configure the router to "Intelligent Balancer(Auto Mode)". It works ...
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84 views

WSUS is not using Akamai CDN for syncronisation source

I've just installed a WSUS onto our network, and I'm currently doing the initial sync. I've found that WSUS does not seem to be talking to an Akamai cache, but rather with MS directly. This is ...