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

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How to host JSON data for a website's JavaScript [closed]

I am about as green as they come as far as networking goes so I am asking for a little latitude. I have a program running on a Windows 2012 server and I need to send a couple bytes of text from it to ...
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70 views

How to simulate network partitions on windows? [closed]

Working on a project which implements a clustering algorithm. One important property of the clustering is to respect guarantees when face a network partition. To prove that clustering works I need a ...
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19 views

1 modem connect with 2 device, how to keep them in the same network? [closed]

My ISP provide me a moderm that has 4 input and I can plug lan cable in it the modem model: http://huawei.com/en/products/fixed-access/fttx/ont/hg863/index.htm So I have attempt like this before ...
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1answer
26 views

Cisco Router NAT does not work

I have an active internet connection from provider on festethernret0 and also have vlan1. I need to have an internet connection from festethernret0 to my vlan1. I am doing it this way: access-list 2 ...
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1answer
36 views

127/8 address is not passed to IP stack?

I send IP/UDP frames using raw sockets with destination IP address from 127/8 range - e.g. 127.0.0.6. So, packets are sent over the network OK (checked using tcpdump on the target device). But on ...
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1answer
26 views

Time Between successive DNS queries.

Using a PC running Ubuntu 14.04. I'm testing web browsing using a very low speed and low data rate link. My system is congested with DNS queries (and other types of packets like TCP re-transmission). ...
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1answer
33 views

When connecting to localhost, does a full SYN, SYN-ACK, ACK handshake still occur?

This question is addressed, primarily for Linux. While I could find the answer myself, I'm hoping someone out there just knows the answer implicitly and can save me some time. If I'm connecting to a ...
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12 views

Route only on output chain?

I have two machines A and B. I want to send iperf traffic from A to B, but first have it route through a userspace program on A. I did this with a tunneling device: therefore, I used the command ip ...
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1answer
18 views

On a Linux NAT host, late duplicate segments cause connection resets

https://www.cloudshark.org/captures/6f185eb12e97 172.30.5.1 Linux vm with bridged networking, running on another server, VM has RFC1918 address only 144.76.103.194 Linux host ...
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1answer
69 views

Limit/Throttle per user OpenVPN bandwidth using TC

I have a group of users connecting to my server via OpenVPN TCP and UDP (2 services). The two services are operating on tun0 and tun1 I'd like to be able to limit each user's bandwidth to say 5mb/s ...
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4 views

SCOM manual dashboard creation displaying blank for network devices

I have successfully installed SCOM 2012 r2 (roll up installed) and able to display all the intended network devices in default dashboard. Now i am going to create manual dashboard for network ...
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2answers
37 views

Is there any disadvantage to putting a modem in bridge mode

In order to prevent the need of port forwarding and double natting I plan to put a modem into bridge mode. Are there any side effects or problems that could come of placing a modem into bridge mode in ...
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1answer
45 views

Windows Server 2008 R2 Standard Dropping Packets

I am seeing a strange problem with my WS2008R2 server I believe is related to networking. The symptom is that 6% of all attempts to ping the server using tcp fails. For example, from another machine, ...
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1answer
9 views

Replicate Partition Over Network

Is there a way, in Windows Server 2012 to replicate two same-size partitions over the network in real-time, preferably at driver level (not user-land)? I am asking for two Hyper-V servers. There is ...
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1answer
32 views

Linux: nslookup and dig resolve $HOSTNAME, but ping doesn't

In our private network we have a Consul service discovery server (10.241.232.14) that provides a DNS interface (port 8600). We would like to set our common DNS servers to forward some queries to the ...
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2 views

TPM Drive Encryption / Network Profile

I have the following situation: I have an old application that cannot be rewritten for various reasons that I can't go into. Just noting that refactoring the source of the problem is a total no-go. ...
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0answers
12 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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0answers
17 views

Web servers configured to use 'localhost' not accessible inside network

What would cause an Ubuntu Server 14.04 LTS machine to lose the ability to use 'localhost' in web-server configurations? If I replace 'localhost' with the machine's static, internal IP address ...
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18 views

Gateway to internet on CentOS 6

I have 2 CentOS 6 linux servers say hostnames cent001 and cent002 cent001 has 2 Nic's 1 Bridged and 1 Nat cent001 is able to ping google server 8.8.8.8 with the help of bridged NIC cent002 has only ...
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37 views

Windows 7 Network Adapter Periodically Shows Disconnected

Description: My company is currently working on a project that utilizes 2 servers, and 1 client, running on an isolated network. Periodically, one or both of the servers will lose network ...
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14 views

Windows 7 behavior on network link between SonicWALL and pfSense

I have two networks behind two different firewall at the same site. I have linked them together by using a spare interface on each device. Network 1 - pfSense 10.0.10.0/24 Network 2 - SonicWALL ...
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1answer
22 views

Hyper-v ISCSI Network Setup

I have Hyper-v installed on Windows Server 2012 R2. We are using 2 x Dell R730xd's with 8 NICS (4x10GigE 4x1GigE) per host. I would like to dedicate 2 NICS to our ISCSI network, however I am unsure ...
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1answer
9 views

ipv6 address configuration on serial interfaces

I tried to configure Ipv6 static routing on three routers, I configured ipv6 addresses on all three routers using ipv6 address auto config, The middle router have been configured with different global ...
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18 views

Vmware guest with host-only network not accessing host services

I've got a vmware workstation 11.1 with a VM on both NAT and host-only (192.168.14.0/24) networks. Both got an ip assigned from dhcp and I've got a default route pointing at the NAT network. The ...
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24 views

Cannot ping gateway (Intervlan routing)

I have two switchs cisco 2960 (sw-120 and IDF1-SW) and router cisco 1841 (IDF1-R). fa0/24 at sw-120 connected via fa0/7 at IDF1-SW fa0/1 and fa0/24 at IDF1-SW switched to trunk mode fa0/24 at ...
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17 views

Remote OSX Server does not accept TCP connections from abroad?

Long story short: I am able to connect to the box (which is located in my office) from home. Two different ISP providers. On the contrary, my friend from the US is not able to access it - the ...
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27 views

High bandwidth, high latency file transfer in Windows

We're attempting to transfer some SQL backup files (~5-75GB each) across a network with about 70ms latency between two servers (Server 2012 R2 - same domain) across a VPN connection. Both servers are ...
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14 views

Configuring additional static IP for Guest Machine

I am trying to bind my Guest machine to respond on my second public IP address. Sometimes it works automatically by DHCP just by configuring my MAC address, sometimes it doesn't work at all. All I ...
2
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1answer
73 views

Surge protection for outdoor network cable run

I'm going to have a network cable run between floors of a home, and most of the run will be outdoors, up the side of the building. I ordered a spool of shielded UV-rated waterproof Cat6 cable. From ...
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2answers
50 views

site-to-site vpn tunnel - does hardware matter? [closed]

I have been tasked with setting up 4 offices and connecting them all together so they can be on the same network. Does hardware really matter or could I build a decent machine in the low $1000's and ...
2
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0answers
22 views

Stream IPTV through SSL VPN

I have a question about streaming IPTV through Cisco ASA5510 ssl vpn. My current setup at the moment is: Public - firewall (asa5510) - L3 switch - L2 switch But my iptv source feed is coming to L3 ...
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1answer
17 views

How to manage access to nodes in a cluster?

I am about to set up a server cluster for our company's web applications. At the beginning there will be 3 hardware servers in Proxmox HA setup in a remote datacenter running about 20-30 VMs all ...
6
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1answer
175 views

4X10GB Bonded NIC - only producing 4-5GB throughput

I have Two HPBL685c G6 blade servers running Ubuntu 15.04 Each server has 4X10GB NIC 2x10GB NIC are connected to a single VirtualConnect 10/10G Ethernet module The other 2x10GB NIC are connected to ...
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1answer
22 views

How is my Mac Mini and Windows PC communicating? [closed]

So I just bought a Mac Mini that I am using as a build server for developing iPhone apps. My I plugged the Mac Mini in, connected it to my Wifi Router, installed a third party piece of software, ...
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20 views

NGINX doesn't start on CentOS 7 reboot (fail on try to bind ipv6 address)

I have installed nginx / 1.8.0 on my server (CentOS 7.1), but does not start automatically after restart due to this error: 2015/06/20 10:34:11 [emerg] 827#0: bind() to [ipv6-address-here]:80 failed ...
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49 views

Different subnet mask on router and DHCP server

ran into something funny today and am still scratching my head on why this happened. I was trying to increase the number of ip addresses available from my dhcp server by changing the netmask from /24 ...
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19 views

SYN/ACK not received by iperf client?

I have an application that essentially consists of four components A, B, C, D. A and B are on the same machine - B and C are separate machines. Traffic is generated by an iperf client on A with a ...
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57 views

Access local network resources remotely using OpenVPN [closed]

I've been banging my head against the wall on this for a week, so thought I'd finally turn to the experts. Much appreciated for any help. What I'm trying to do: I have some resources on my local ...
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1answer
25 views

netsh command to add interface

I am working with Windows 2012 R2 Core and I having problems with setting up my NICs after they got reset. When I run "netsh int show int" it shows bother Interfaces as Enabled and Connected. ...
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2answers
58 views

How to get a client IP address from a specific network?

I have a condition to filtering IP address from client, and I just have their IP network like this 1.1.0.0/17. If some client from this network will be filtered as special user on my website. And I ...
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1answer
20 views

Azure Virtual Network Custom DNS

I created a virtual network and put 2 VMs in one subnet. But they were not able to ping each other using their hostnames. I need a DNS Server implemented so that hostnames in the subnet can be ...
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1answer
33 views

Connect to repo IP address A if it is up, else connect to repo IP address B (Client side) [on hold]

There's an SVN repo hosted in a server behind multiple ISPs, and depending on the ISP connection, the admin of that SVN server changes the repo's IP address and announces "hey, our IP address changed. ...
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1answer
44 views

NIC seems slow, even on 100Mb/s full duplex [closed]

So I have a server running Centos 6 64bit with cPanel. It's set on eth0 running at 100MB/s full duplex. But, one particular server seems sluggish on its connectivity, despite server load being minimal ...
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10 views

Application Virtualization Risk Through WAN / Internet

I was weighing pros and cons about the new mission critical system that through application virtualization, will allow my colleagues from 3 different countries to access it. Here are some background ...
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2answers
42 views

Will setting up a VPN prevent others from seeing what is on the network? [closed]

I have a computer in the house that is used for a work from home call center business. Part of their contract is for nothing else to be connected to the network (wired or wifi) during work hours. ...
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1answer
28 views

can I keep company-purchased IP addresses when migrating to AWS (or other hosted service) [closed]

We currently run our own data center and want to migrate to AWS. Because we send a lot of email, we want to retain the IP addresses that we have purchased (they have a good reputation with ISPs) Will ...
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1answer
24 views

Can't connect php to SQL server, error:0

I've set up an internal Ubuntu 14.04 LAMP server. I can access SQL when using Putty, but when I try to connect via php script all my pages were blank... Then I tried to debug it by simply connecting ...
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2answers
12 views

Modsecurity rule to not scan URIs

Good Morning, I am currently on creating a new mod security 2.5 rule. My deployment: I have an Apache server in reverse proxy mode. This Apache server does not host the websites. Instead, I proxy ...
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1answer
49 views

Incoming SSH works, but all outgoing fails

Terminology I have a server (I'll refer to it as S1 ) running in the cloud, but it is misbehaving. I also have another server (S2) running in the same cloud network, connected to S1 through a ...
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29 views

Two processes stuck on network communication

We have had hang on our Oracle extraction process very intermittantly. Nothing obvious from the Oracle side, and starting to think it is more network related. There are two Oracle processes ...