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

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Connection setup / initial connection time

I just changed my hosting service to a VPS and something strange happens. When I run both sites through chrome developer tools network analysis I get very different behavior. The site on the VPS ...
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43 views

some IPs within a subnet not reachable

I'm running 3 Debian-Servers, each with its own IPMI. All IPs are within the same subnet with the same gateway. The problem is, that each server can ping its own IPMI but not the IPMI of the other 2 ...
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57 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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0answers
27 views

Security concerns w/ physical vs virtual network gateways [closed]

I am in the process of setting up a private network that uses a gateway system for access to certain services on systems behind the network, e.g. ssh, ftp. I have some experience using virtualized ...
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2answers
46 views

Two of the same subnets on the same network. Possible?

I have a question for everyone that I am a little confused about. If you have a network. 192.168.1.254. I know you can put in a router as a gateway and get another network with 192.168.10.254. My ...
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2answers
39 views

Accessing server on private network

I have several IP based data-loggers behind a customers' gateways/proxies/etc. Around every couple hours, the data-loggers will act as clients and initiate communication in order to upload trend data ...
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22 views

Is the switch at fault? Backups sometimes take considerably longer and sometimes packet loss

We have a strange problem where sometimes backups at night take considerably longer (like 40 minutes longer than average) while the backup size doesn't actually change much. While trying to figure out ...
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18 views

Connection issues with remote machine

My primary windows 7 desktop machine seems to have intermittent problems connecting to a specific host, shuningHost for our purposes. (Win Server 2008, running on VMWare I think). When I try to hit ...
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2answers
26 views

ubuntu network settings equivalent in centos 7

I have in a ubuntu server an interface setup as the following (in /etc/network/interfaces) address xxx.xxx.xxx.xxx netmask 255.255.255.255 broadcast xxx.xxx.xxx.xxx post-up route add xxx.xxx.xxx.xxx ...
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1answer
45 views

Two stacked HP 2900-48G switches. Now I need a couple SFP+ ports, possible?

I have two stacked HP 2900-48G switches in rack A. Now in rack B I need a switch that provides at least two SFP+ ports (for two servers) and at the same time establish a 10G link to the switches in ...
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2answers
13 views

How do I monitor network usage on a Windows server?

I would like to monitor server bandwidth usage. The server OS is Windows Server 2012 This should give me as result the amount of data over a certain period of time and separate it by protocol and by ...
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39 views

ICMP replies - ingress or egress interface (e.g. from a traceroute)

When a traceroute is initiated and receives an ICMP replies from the nodes, which interface should the be replying from according to RFC 1812. they are actually replying from ingress (where they ...
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1answer
49 views

How can i know whether a dmain admin “ever” browsed my computer's files? [closed]

I have a problem and i was hoping for an answer for by all the smart gentlemen around here. I work in a company that contracted with some external IT auditors as "ethical hackers" where they are ...
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0answers
76 views

Two NICs for one KVM guest

I deleted an old KVM guest and now have a spare IP address. I now assigned this (previously working!) IP address to another KVM guest, like so: virsh # attach-interface my-guest bridge br0 vnet1 ...
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0answers
28 views

Hyper-V Server Deployment - adapter configuration

I'm sure this question will have been asked somewhere before. In fact I'm sure I've read about it before too, but I can find any resources to help me along my way. What I'm trying to do is deploy a ...
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1answer
62 views

Ping response time suddenly rose up to average 1500ms or more

At normal situation the ping (8.8.8.8) response time is 50ms. But out of sudden it just peaked to 1500ms average or more and quite frequent recently. My server is CentOS 6.6 with eth0 (192.168.1.1) ...
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1answer
82 views

Migrating from a Class A network to a Class C network [closed]

In broad terms, how can one safely to transition from a Class A (10.x.x.x) to Class C network? We have a gateway for the internet, and a separate local DNS and DHCP server, in this setup.
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23 views

Bulletproof AirPlay Connectivity for Meeting Rooms? [migrated]

I give presentations to large audiences showing an iOS app's functionality. The mobile device I use has a protective sleeve that cannot be removed. My current setup is to run AirServer on my MacBook, ...
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2answers
99 views

PCI scan failed for “scan interference” on Sonicwall NSA E5500 firewall

We've started having Trustwave do monthly PCI network vulnerability scans. The last couple months we've passed, but this month it failed for "Scan Interference Detected." This is their recommendation: ...
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1answer
68 views

Network link saturated. How to fix?

I have a backup server installed in rack A. That rack has a Cisco WS-C3560G-48TS-S switch installed. I also have 10 proxmox servers (=linux vm host) in rack B. That rack has a HP 2810-48 switch ...
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0answers
32 views

pppd terminated bya SIGTERM in Centos 7 — who's sending it?

Folks, I created a script to keep a persistent "emergency" connection with a 3G modem, so I can access my CentOS 7 makeshift server remotely if the usual network fails. Everything works for a few ...
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1answer
51 views

Connecting Win7 to Win7 through switches, EnGenius, and Routers

Weird networks, causing weird problems. I am a new employee at this company, the network is a bit weird, but I have figured it out to a degree. I have some networking knowledge, but not greatly ...
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2answers
26 views

Allow others to use a server-to-server IPsec connection

I have an issue concerning secure IPsec connection between two servers over the internet. One belongs to us and lives in our data-centre, and one belongs to them. I need to somehow let members of my ...
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1answer
28 views

Server 2012 multiple NICs for VMs

I'm trying to setup a Windows server 2012 machine with multiple VMs (10+). The server also has 2 on-board NICs and 4 more via pci-e card. My main goal is to have the on-board NIC be available only to ...
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30 views

Force local IP traffic to go through LAN WITHOUT ip address changes

I know there's some topics about forcing local IP trafic of a Linux machine to go through the LAN (over the network where a WireShark is captuting trafic) but all solutions implies IP address ...
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3answers
31 views

Manage/Limit Internet Bandwidth on Specific Wireless Network [closed]

I offer wireless internet to my tenant and the problem I have is we are constantly hitting the cap for the monthly internet usage. What I ideally would like to do is create 2 wireless networks: one ...
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1answer
30 views

Can't connect to azure vm's through network discovery

Can't connect to azure vm's through network discovery. I have enabled: Function Discovery Resource publication SSDP Discovery Upnp Device host and DNS client I have turned off all of the firewalls, ...
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22 views

not able to create openvpn tunnel for two interface host

I am new to openvpn. I try to create openvpn tunnel between two hosts. Both hosts have two interfaces. Say eth0 and eth1. So I created two config files, server.conf, server1.conf. At client side, ...
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1answer
43 views

Why would a network resolve some sites and not resolve other sites?

Win 8.1, IE 11 I recently made some changes to my internal network and suddenly attempts to access Bing are giving an error. My network is: When I connect either wired or wireless to the wireless ...
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2answers
50 views

Will computers connected to a switch have a different ip? [closed]

I want to set up a network switch with several servers connected to it that must be port forwarded. Please refer to the below diqgram for my setup: ___Computer 2 | ...
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2answers
67 views

iptables: trying to block port 53 but not working

I'm messing around with IP tables and I'm trying to do the following: I have several hosts on the same network: 192.168.1.0/24. The DNS server is 192.168.1.1. I'm trying to prevent all the hosts ...
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Network Configuration - Multiple Vlans with Domain Controller

I am new to the community and somewhat new to networking/server administration in general and need some help with my network configuration. Currently my network is somewhat small, we have about 10 ...
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19 views

IIS Intranet Application using Windows Authentication but accessed by two different local networks

Got stuck in a very strange situation. I am a developer so really not very good in networking. I really need help to figure out the solution if my problem. So, here is my problem, I am working on ...
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1answer
36 views

Troubleshooting “Network is unreachable” from within an Amazon VPC

An EC2 instance is running Amazon Linux in a public subnet in a VPC. Here are the outbound rules for its security group: ALLOW TCP on port 80 to 0.0.0.0/0 ALLOW TCP on port 443 to 0.0.0.0/0 ALLOW ...
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33 views

Using VPN inside and outside of LAN (2 IP adresses)?

I have just setup a small VPN server racoon/strongswan/etc. (192.168.0.100) in my home LAN (192.168.0.0/24). The LAN consists of a single TP-Link router (192.168.0.1) and various clients ...
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1answer
63 views

What is the proper way to create a vlan?

My goal is to create a separate VLAN, that will be isolated from the rest of the office, I just want them to have internet. Normal pc stations x1 HP Procurve switch V1910 x1 cisco asa 5512-x What ...
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1answer
25 views

Virtually isolate a server test environment

What is the minimum implementation that ensures some test servers (like domain controllers) don't send out network traffic that crosses over with production systems? The purpose would be to setup a ...
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2answers
54 views

Why woud ping fail but not traceroute

For a few days now I started making the interesting observation of a machine intermittently not responding to an ICMP ping, while it still responds to an ICMP based traceroute (specifically set via ...
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34 views

How to setup web UI to view Master Spark Node from Host Machine

I think the solution is to port forward twice, but I am unable to ssh into the master (source) machine: How do I view the Spark web UI? I am following this tutorial: ...
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1answer
38 views

Dynamic NAT configuration

I am using two routers and one host (computer), I connected fast Ethernet 0/1 of router A with the host and fa0/0 of the router A with the router B I have configured gateway as last resort on both ...
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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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4answers
101 views

How do I simulate an unreachable host on windows?

I have a windows 8 PC, I am testing a beta program for network socket error handling. One of the ones I am having problem simulating for it to test is host unreachable and network unreachable errors. ...
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33 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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23 views

FreeBSD Inconsistent Ping

I have installed the FreeBSD in a local machine. When I try ping from another Windows PC(Say A) connected in same local network I am getting different output each time. 1st Ping Pinging 192.168.1.35 ...
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11 views

what the best approach to get the network values on Linux machines [duplicate]

what the major difference between ip addr command to ifconfig -a command? both command are give the same values network IP's ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc ...
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31 views

How can I use host only networking from Vagrant with a static IP?

I have a device on my host operating system with the following configuration: vboxnet2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 0a:00:27:00:00:02 inet ...
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21 views

Detect if a occasionally slow request is caused by network

I developed an SPA web app. It works super fast but for one specific customer it is sometimes very slow without apparent reason. The customer was showing me his screen over skype and I ask him to open ...
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1answer
43 views

Figuring out who changed the privilege?

Sorry if this is one of those really simple questions, but I am trying to figure out if there is any way I can see what user changed another users privileges. I have a server running windows server ...
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37 views

openVPN file transfer speed

Problem: File downloads to remote office, pulling data from server are stuck at 128KB/sec (as reported by windows explorer), which is roughly 1mbps. Question: Why can't I get close to remote office ...
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2answers
56 views

Sniff outgoing traffic on my server on a SSL channel

Im executing a CURL command on a php application running on my nginx server (centOS). The end point is a https address so the outgoing traffic is of course encrypted. I want to see the network ...