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

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5answers
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What is the origin of the private network address 192.168.*.*?

I had a smart (but non-technical) user ask me today: Why did they pick 192.168.. for a private network address? The only answer I could come up with is because 192 = 11000000 in binary. And 168 is ...
-2
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0answers
21 views

Tools for automated network device discovery and config? [closed]

Two weeks into a new job, I've just spent far too long on the shop-floor manually configuring and troubleshooting one of $company's products ready for shipment. We produce products which, for the ...
0
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0answers
28 views

How to resolve Linux web server lost network pockets

My website is hosted on a Ubuntu web server. The web server is installed on VMware from the win server 2012. Server and web server are in same subnet, 20.235.*.*. Yesterday I restarted the web ...
3
votes
2answers
1k views

Winbind/AD: Local users with identical AD usernames

We are getting ready to add Winbind/Samba to some CentOS servers. Identity Management for UNIX is running on our DC, and it's testing well so far. There is one scenario I'm having trouble with, and I'...
-1
votes
1answer
20 views

How to deal with a short in a cat 5e cable [closed]

I am in the process of cleaning up my cables and as part of it testing all connections. One cat5e wire that snakes thru the walls and I can NOT replace as it's not going to pull around the bends, is ...
0
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1answer
12 views

vSphere - Virtual Network Device Issue

So I have network monitoring at our business and since we have been monitoring I have noticed massive spikes on one of our core switches in particular -it is causing our internal network to slow down. ...
0
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0answers
6 views

Connecting 2 servers with QLogic BCM57810

I'm experimenting with different ways of connecting 2 servers together I already have 2 Qlogic BCM57810 and Avago AFBR-709SMZ along with some fiber patch leads. This is my first time playing around ...
0
votes
1answer
1k views

Forwarding SNMP ports over SSH

I access my work network through a VPN and have access to every host in there through SSH. Currently I need to access around 3000 hosts via SNMP, but corporate sec policies restrict SNMP access ...
-2
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0answers
20 views

What and How should be network design for 5 floor building? [duplicate]

5 Floors. 1st floor-185 nodes, 2nd floor-160 nodes, 3rd floor-340 nodes, 4th floor-100 nodes. My server Room is on Third Floor. Plz help me to find my network should be distributed with hub room at ...
2
votes
0answers
24 views

What is the purpose of a “static LACP” trunk group on HP switches?

I'm in the process of educating myself regarding configuring aggregated links on HP ProCurve switches. Looking at non-vendor-specific documentation regarding link aggregation, the defining ...
0
votes
1answer
29 views

What's the legit use of a deauthentication packet?

Most people that have tampered with external wireless networks in a malicious fashion for the sake of education (hopefully your own personal testing network) have probably heard of a deauthentication ...
1
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1answer
1k views

Multiple Homed Windows 2008 Server / Windows 7 Client

I have a small Windows 2008 network, with some Windows 7 clients. The clients are both laptops with docking stations and I would like them to communicate with the Windows 2008 server (for filesharing) ...
0
votes
1answer
11 views

Accessing to a remote PostgreSQL server using port forwarding to another machine

I try to access to a Server_A on which PostgreSQL is running. This server is on a local network, that's why I have to forward port from Server_B which is accessible and in the same network. To access ...
0
votes
2answers
2k views

Access print server through firewall?

At my workplace, we have two fiber networks setup, one for the business network and the other for process control (industrial manufacturing). On the business network, there is a standard print server ...
-2
votes
0answers
15 views

Windows 7, 64 bit, Office 2013 [closed]

July 2016 - I got Cisco Any Connect Secure Mobility Client v 4.2.03013 pushed on us at work. We have Windows 7 64 bit. This is causing us to loose all network connectivity. This is not my strength so ...
0
votes
2answers
43 views

What is the benefit of the port portion of the “Host” header in HTTP/1.1?

Can anyone explain what is the benefit of the port portion of the "Host" header in HTTP/1.1? Is it so that we can have two or more websites with the same names (but different ports)?
0
votes
1answer
10 views

Bridging host-only subnet on multiple Dom0s

I currently have two XEN-Hosts running a set of virtual machines. These machines can communicate with each other via a host-only network. I want to be able to move virtual machines between both ...
1
vote
2answers
3k views

Unable to ping multicast IP

Let me prefix this by saying I'm not entirely clear on how multicast works. I have the gist of it, but not the underlying functionality. A customer has configured a RHEL6 cluster between two Jboss ...
0
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0answers
23 views

Have Internet access but no Ping [closed]

l am running a VM with Centos 7 on my windows7 machine . The problem is i can't ping to any network but i have internet access on my machine. Also my network status on VM shows: Failed to start LSB:...
-1
votes
2answers
48 views

How to count the number of SYN, ACK, or SYN-ACK in a second? [closed]

I want to make a DDoS SYN Flood Detection, so i need to count the number of SYN, ACK, or SYN-ACK packet per second.
0
votes
0answers
37 views

libvirt IPv6 Guest can't connect outside of the Host

i am trying to get a address from my IPv6-Subnet working in a Virtual Machine(libvirt, qemu). IPv4 over nat works like a charm. The host is a Debian 8.5 with qemu 1.2.9 and a 4.6.3-1~bpo8+1 (2016-07-...
0
votes
0answers
30 views

Diagnosing slow server networking

So, I have 3 servers all networking together to run a single high traffic website all of which use Cloudflare for reverse proxy purposes. Two are webservers (which are identical) and one is a ...
0
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0answers
10 views

Can't access server after editing network interfaces during openstack installation

I was following the instructions at http://www.tecmint.com/openstack-networking-guide/ to configure openstack networking for openstack interfaces. I found I had two network card files, I edited the ...
2
votes
3answers
1k views

How to speed up Drupal 7 with remote DB (not DNS resolving)

we have Drupal 7 on Ubuntu LTS virtual machine (VMWare) with MySQL 5.1 server on the same physical server, but on a different virtual machine. The Drupal website is currently under development, ...
5
votes
1answer
1k views

NFS mount mounted inside another NFS mount disappears randomly

I have quite an odd issue where my nested NFS mounts just disappear randomly from time to time. The fstab entries look somewhat like this: nfs:/home /home nfs rw,hard,intr,rsize=32768,noatime,nocto,...
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votes
0answers
9 views

Freesco cant ping other machines [closed]

Im having some trouble with setting up Freesco on my VMworkstation, hoping someone can help.. I have a freesco VM with 3 NICS NIC 1 - Bridged with host 192.168.0.2 255.255.255.0 GW 192.168.0.1 (my ...
4
votes
4answers
49k views

Change gateway on windows 7 from command line

I am trying to find how to change the default gateway on a Windows 7 machine from the DOS prompt. Thanks!
0
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0answers
16 views

CISCO: Use Specific Outbound IP For Locally Initiated NAT-ed Connections

I have a CISCO 2911 router, multiple public IPs and few servers. I have setup my router (ROUTER1) to be accessible through internet-accessible public IP (lets say) 190.0.0.250 and its local IP to 10....
2
votes
0answers
55 views

Painfully slow network when routed through Windows 2012 R2

I have a Windows 2012 R2 server with two network adapters, on-board 1G one for the LAN and a 100M D-Link 530T connected to the internet. Internet Connection Sharing is set up on the latter. Client ...
6
votes
7answers
5k views

Which device should I use as DHCP server?

In our administrative building we have a network with around 150 workstations. Till now I used fixed IP address giving the specific department one range in same address. Etc in marketing I had 192....
4
votes
2answers
516 views

Why do I get “No subnet declaration” starting ISC DHCP server on subinterfaces?

I have created two subinterfaces on eth0 : eth0:0 with IP 192.168.10.1/24 eth0:1 with IP 192.168.11.1/24 Configured /etc/dhcp/dhcpd.conf like that: option domain-name-server 194.204.159.1; ...
0
votes
1answer
44 views

Is it necessary to include “Connection: Keep-Alive” in the response message?

Based on my understanding, a server uses the Connection: Keep-Alive header in the response message to tell the client that it will not close the connection after sending the response message. But is ...
0
votes
1answer
65 views

What does “Connection: close” means when used in the response message?

When the client uses the Connection: close header in the request message, this means that it wants the server to close the connection after sending the response message. I thought that this header is ...
0
votes
0answers
34 views

Running a router inside an OpenStack VM

I'm trying to make a router VM (actually an IPsec VPN server) inside OpenStack. The OpenStack is an installation of Mirantis 7 (why not newer? 8 from some reason causes kernel OOPS to the same image ...
5
votes
1answer
2k views

Ping not working from tap interface attached to bridge interface with ip on same subnet as that of bridge to outside

My requirement is to create a multiple tap interfaces, each with ip address on same subnet. I tried this by creating a bridge br0 (192.168.1.199) ___________|...
-1
votes
1answer
44 views

can't connect to couchdb remotely

I am trying to connect to Couchdb remotely, however, I just get Unable to connect . I can ssh into the server (actually just a Raspberry pi currently) through an ASUS router. netstat -an | ...
1
vote
1answer
1k views

netstat -e: high discards and errors

I think my network is congested because of the relatively large discards and errors data. They should be zero or at least close to that. Here is the output of netstat -e on my computer: Interface ...
0
votes
0answers
18 views

CentOS/RHEL Limit Bandwidth to specific IP

The scenario: We have a file server (local1). local1 is directly internet connected (no router/firewall in front). We have several remote VPS nodes (remote1,remote2,remote3). We use UDP (udt-...
3
votes
1answer
105 views

When wouldn't an ARP reply be generated?

Summary of the problem: a ping from client does not go to rpi1, its ARP call is not answerd at srv. host0and tap0 are bridged by br0. vpninand lan0 are two independent interfaces. All traffic ...
1
vote
1answer
358 views

Mesos slave IP for Marathon-launched ( docker container ) service instance

i have a docker image i would like to launch a couple instances of via Mesos/Marathon. i'm using BRIDGE networking in docker, and i would like to pass in the "public" ( i.e. not the container's ...
0
votes
1answer
29 views

Why is my host not receiving packets sent across tun0?

I have a tun0 interface set up which allows packets to be sent as such: HOST (aaaa::1) ----> tun0 ----> SLIP ----> Router (aaaa::200:0:0:1) The router receives the packets, and can send back a ...
0
votes
0answers
67 views

Access through jmx to java application into Docker container on remote host in local network

I can't connect through jmx (with VisualVM) to java application into Docker container on remote host in local network. Screenshot of the problem. Case 1: Java application into Docker container on ...
10
votes
5answers
17k views

What is the disadvantage to cascading multiple switches?

I have to wire a new office for ethernet and the contractors want to charge atrocious amounts for each line running to each room in the office. It will be much cheaper for me to run a single line to ...
0
votes
1answer
20 views

Issues with DMZ on Fortigate 90D, second router can't reach internet

I am having issues setting up a DMZ port on my Firewall (hardware router). I am also assuming this belongs in Super User, as it seems like a basic DMZ setup. Here is the setup: I have a Fortigate 90D ...
0
votes
1answer
17 views

Ubuntu 12.04 server cannot access anything outside

My Ubuntu 12.04 server was working fine a few days ago. But today I couldn't access anything outside. And i cannot ssh to my server neither. I am directly plugged into the console through my vps ...
3
votes
2answers
4k views

UDP port appears to be in use but is not shown in netstat or TCPView

I've encountered some strange behavior I don't understand. I'm installing software on a Windows 2003 Server. This software needs to bind to a specific UDP port an all TCP addresses in order to listen ...
38
votes
5answers
208k views

Resolve host name from IP address

I'm looking for a command line tool which gets an IP address and returns the host name, for Windows.
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0answers
24 views

Getting slow upload (to internal Win box) only from Win10

I have a user in the office who was on Win7 Pro. Since there's a Win10 upgrade going, I thought I would test/piolit it with her, so I loaded Win10 on a spare Lenovo box (MT-M 7052-A7U). Everything ...
4
votes
5answers
31k views

Domain connection shows as “unauthenticated”

I have seen various different questions for this problem floating around but either the circumstances arent the same or the solution doesnt work so thought i would post it to see if anybody has any ...
2
votes
3answers
131 views

KVM-Host lost connection to Storage

I would really appreciate some advice on how to fix this. I have a Debian KVM-Host with 9 Debian VMS running on it. The virtual machines are running on my little Storage via iSCSI. Now, my switch ...