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

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Ping is happening but arp is not resolved

I am seeing one interesting problem. I have setup two devices connected through lan cable over eth3 interface. Now a vlan session has been created on both the interfaces. Device 2:root@10:~ >ifconfig ...
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11 views

Apache reverse proxy for external services

I'm not even sure this will make sense, so please bear with me. Currently, ports 80 and 443 are used for my routers web interface. I have an instance of Ubuntu 14.04 on my home VM that has LAMP ...
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0answers
10 views

Speeding cPanel migration time? [on hold]

I was given a task to cpanel-cpanel migration in my city from remote server, about 1TB of data to another server. I shall have to migrate everything in 2hrs, and my network connectivity is only 10 ...
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4answers
63 views

How to get 2 servers under control (Red Hat Linux)

I've got kind of a situation here. We need to get 2 servers under our control. The things we know so far: both are running linux, at least one is running Red Hat they are used as file-server, mysql ...
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1answer
14 views

iptables TEE UDP traffic to a different subnet

I'm looking for a way to replicate UDP traffic received by one host to another host in a different subnet. The TEE target in iptables only works with gateways in the same subnet, i.e.: On the ...
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0answers
12 views

How to get MAC address of remote mobile device(mobile phone, tablet and so on) [on hold]

For iphone, as far as I know, after IOS 7, can not get MAC address via SDK. For Android device, it seems I can get MAC address via SDK. But both of above need install a APP on device, and send the MAC ...
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1answer
21 views

Bind 9: Two public IPs x One Server (CentOS 6)

My current network has the following logic. Each router has a public IP. Router 1 192.168.0.1 255.255.255.0 Router 2 192.168.0.2 255.255.255.0 Server 1 192.168.0.7 255.255.255.0 I want to ...
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2answers
578 views

Should an Azure VM have an Internal IP address of 100.x.x.x not 172.x.x.x or 10.x.x.x?

I have a Windows Azure host that has an internal IP address of 100.x.x.x. I would assume that this is conflicting with external hosts with the same net mask. Is there any assurance that I will not ...
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0answers
40 views

Debian - static ip, /etc/network/interfaces

I tried to set a static IP on my Debian 8.1 (in VirtualBox), so I edited the /etc/network/interface file : # The loopback network interface auto lo iface lo inet loopback auto eth0 iface eth0 inet ...
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2answers
34 views

how to ssh from a vm to another vm that is on a different host

I have 2 CentOS computer in the same local area network. Both computers have their own virtual machines running CentOS. I would like to ssh from the virtual machine of 1 host to the virtual machine of ...
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1answer
19 views

Separating test environments

We're utilizing TFS and Hyper-V with SCVMM for our testing environments, but unfortunately we don't have any network separation right now. We had to create our own domain in order to most effectively ...
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9 views

One of VPN clients cannot connect to some remote computers

I am baffled. We have openvpn server and have many clients on 10.128.28.xxx network that are able to connect to all our networks. I installed vpn client on one windows box - for some reason that box ...
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0answers
11 views

Wait init.d script until host name is ready, Ubuntu/Mint

I have a postgres SQL, which I would like to bind to local host and internal net IP. In /etc/postgresql/9.3/main/postgresql.conf . . . listen_addresses = 'localhost,myhost.mynet' . . . If I just ...
1
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1answer
26 views

Port forward linux iptables

My current network setup consists of a physical nic eth1 receiving my public ip from the modem. Next I have kvm/qemu virtual machines running on a virtual network using the ip range 192.168.122.0 - ...
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16 views

Getting server to reply to client via either network (they can see each other in multiple networks)

I have multiple internal networks, each of them also corresponding to a different VLAN. There's a firewall that acts as the gateway for everyone on every network. It has multiple interfaces, one on ...
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0answers
8 views

Netgear Switch Configuration File Type [on hold]

My company has Netgear GS724TP switches and I need to download the configuration file for each switch. What is the file type in which they should be saved as? I've seen .ber, .scr, .cfg, and .txt. ...
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0answers
26 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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1answer
17 views

How to configure a zone transfer from a windows 2008 primary dns server to a CentOS secondary dns server

So my primary dns server is a windows machine and I would like to configure a zone transfer to a secondary dns server that runs CentOS. Both indivdual dns servers were tested and work on their own. ...
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1answer
34 views

MSE changed windows firewall settings and win server 2008 r2 can not be access by it's name anymore

i have installed Microsoft Security Essentials on Win server 2008 R2 and it modified the Windows firewall, this caused an access problem, win server 2008 R2 can not be accessed by it's name anymore ...
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0answers
15 views

Window Server 2003 Computer Not Accessible From Other Computers But Ping Works [on hold]

I am a new member and I wanted to add a comment on the question in this post I can ping a network computer but not access it but was unable because I needed to have a better reputation and I wanted to ...
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0answers
25 views

Change Gateway doesn't work on Windows 7

This PC was configured with 192.168.6.1. But I tried to change it to 192.168.6.51. Although route print showed the default gateway is 192.168.6.51, but the packets next hop is 192.168.6.1. IPv4 Route ...
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0answers
20 views

Can DNS fail because of a client server configuration? [on hold]

I recently began work in a new environment. The network has many subnets and many nodes with many network engineers who work in the environment. There is a Linux server with Cobbler on it. It has a ...
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0answers
61 views

Does Fast Retransmit and Retransmission Timer work at the same time?

When Fast Retransmit is implemented, if I received packet 1, then I will send an ACK that says I need packet 2, and then if I received packet 3, I will send a duplicate ACK that says that I need ...
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1answer
75 views

MIKROTIK - Two LANs connected with switch

I have a very simple network. I have two LAN networks (192.168.2.0/24 and 192.168.3.0/24) connected via a router at each site and the routers are connected via a switch. ...
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1answer
30 views

Different network speeds from servers on same subnet

I have a pretty strange issue, I'm looking for advice on how I can debug it. I have two servers (A) and (B) on the same subnet and switch. Server A->B transfers at a full 12MB/s and vice-versa. ...
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0answers
20 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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0answers
19 views

Can /etc/inittab errors prevent network startup? [on hold]

I have a small php server running on Raspbian via /etc/inittab: push:235:respawn:/home/pi/volkszaehler.org/misc/tools/push-server.php Due to configuration issues my php script was removed and- in ...
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0answers
44 views

Why is giga bit network fast than disk? [on hold]

Why is fast giga bit network than disk? According to below URL for slide of Dr Jeff Dean, giga bit network is fast than disk. ...
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0answers
16 views

Policy based routing on centos [duplicate]

I am trying trying to implement policy based routing on a centos 7 server using these directions - . The routing works fine until I reboot then the policy routing rules disappear. If I enter them ...
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0answers
4 views

RADIUS for unique hotspot and iOS clients?

Sorry if stupid questions. I need to be certain. Is Radius needed for a hotspot captive portal, where no login is needed, and which is unique (one only router) ? Is Radiys involved in another thing ...
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0answers
13 views

VirtualBox networking (inception computing) [on hold]

I am new to world of networking and now I am trying to connect 3 PC`s together. I have windows 7 host that runs Ubuntu64-bit server guest, that runs ubuntu32 server guest. Win7- Host Only network ...
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2answers
19 views

Using IIS to give domain name to external site

At my workplace we are currently hosting our own website on a windows server using IIS. We've now had a new public website created by our marketer using SquareSpace and we want to be able to point our ...
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27 views

Can't access from outside process running in a Docker container

I'm trying to run a gameserver inside a docker container on my server but I'm having troubles connecting to it. I created my container and started my gameserver (which is using port 7777) inside it. ...
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0answers
15 views

DNAT not forwarding to correct (local) IP address

I'm trying to port-forward a HTTPS service which uses different SSL certificates for each of the several IP addresses on the machine. Web server listens on each IP address on the internal port (444) ...
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1answer
40 views

What can I do to improve a business-oriented network that only has access to 3 6Mb/1.5Mb lines with 15-30 clients?

I work at an e-commerce based business in a 16k warehouse. The only available ISP solution is AT&T, with each 6Mb/1.5Mb line costing $50 and fiber optic being an option for $800/mo at 20Mb/20Mb. ...
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1answer
25 views

What can I do to improve a business-oriented network that only has access to 3 6Mb/1.5Mb lines with 15-30 clients? [duplicate]

I work at an e-commerce based business in a 16k warehouse. The only available ISP solution is AT&T, with each 6Mb/1.5Mb line costing $50 and fiber optic being an option for $800/mo at 20Mb/20Mb. ...
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0answers
7 views

NIS client is not able to change password using yppasswd in OpenSuse 13.2?

NIS Server - OpenSuse 12.1 NIS Clients - OpenSuse 13.2 At NIS Client: nisuser@opensuse13.2:~> yppasswd yppasswd is deprecated, use /usr/bin/passwd instead Changing password for nisuser. Old ...
2
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1answer
47 views

Securing Windows Server 2012 from the internet

I've placed my direct internet connection into the public profile for the firewall and started disabling every rule to block all but RDP. The only rules I am not sure about are these Core Networking ...
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0answers
12 views

windows server 2012 disable automatic lockscreen/logout after end session

I'd like to disable disable automatic lockscreen/logout after end session. I need this because autoit scripts being automaticly stopped as I close remote desktop.
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2answers
14 views

How do I stop a simple DDOS attack?

There is a hacker who is mad at us, and has started a DDOS attack against us. I think he is a script-kiddie, using tools like DarkComet; the attack is probably simple. I host a server on my PC. The ...
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0answers
16 views

AWS + KeepAliveD: Not able to Ping or Telnet Virtual IP from remote hosts

I am setting up KeepaliveD with 2 nodes on AWS by following this article. My Virtual IP gets moved from one node to another in case of fail-over. However, the VIP just cannot be accessed from a remote ...
1
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1answer
20 views

KVM fastest network between 2 guests

I wonder if there is any way to speed up the network communication between 2 KVM guests on the same physical machine. Would that help at all if I would configure a separate bridge network for just ...
-1
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1answer
37 views

Hostname is not mapped to the ip address correctly [closed]

I recently installed Wordpress on my home server running Arch Linux. Everything else works smoothly except that when try to access the server externally, the style sheet is not rendered. I have read ...
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1answer
30 views

How to use lan ip on outside server [closed]

I have a D-Link Router with Static Ip Address. That ip is located in sri lanka. Now i have a vps in usa. But i want to use that sri lanka ip on my vps as main server ip. It is possible? If possible ...
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0answers
16 views

Can't access host-only network when on two interfaces [migrated]

I'm trying to use a host-only connection with my VirtualBox VM. My VM is set up and can ping the host (192.168.56.1) on vboxnet0. If I disconnect the host from my local network (internet access) I ...
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2answers
81 views

IP on different subnet mask [closed]

I'm still learning the ropes of Windows Server (specifically 2012R2). My assigned task is to setup a static local IP address, I managed to get it set to 192.168.1.96 (with subnet mask 255.255.255.0) ...
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1answer
30 views

How to extend the VLAN defined in the Ethernet network into the WiFi network? [closed]

How to extend the VLAN that you have defined in the Ethernet network into the WiFi network?
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0answers
8 views

ip command vs qdisc discrepancy in dropped packets

I am simulating packet loss via mininet network on Ubuntu 14.04. Why are there no dropped packets showing up in ip command? For switch s3, I have Qdisc (sudo tc -s qdisc show): qdisc htb 5: dev ...
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0answers
24 views

Proxying request from nginx docker container to tomcat docker container (all inside Vagrant VM)

Running a Vagrant (virtualbox) VM with two docker containers inside, nginx and tomcat. Want to host static files in nginx container and proxy web requests to the tomcat container. I've read up on ...
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0answers
13 views

Broadcomm 53393 ethernet switch [closed]

Anyone worked on this before ? Tried to work with very limited documentation. Need someone who has past experience or can point me to a reference source.