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

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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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23 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
38 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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20 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 ...
1
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0answers
37 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
32 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
66 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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28 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 ...
3
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76 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
149 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
34 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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28 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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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
5 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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2answers
25 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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0answers
18 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
41 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
26 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
18 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
55 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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13 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
58 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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38 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 ...
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1answer
27 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 ...
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1answer
43 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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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
98 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
38 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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12 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 ...
0
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0answers
59 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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42 views

Solaris 5.10 telnet connection closed by foreign host

I try to connect to a Solaris 5.10 server using telnet, but I only see: $ telnet xxx.xxx.xxx.xxx Trying xxx.xxx.xxx.xxx... Connected to xxx.xxx.xxx.xxx. Escape character is '^]'. Connection closed by ...
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32 views

Dnsmasq , redirect all but google.com

My router uses dnsmasq. In my dnsmasq.conf, I write: address=/#/127.0.0.1 in order to resolv any domain to my local server. It works. Now I'd like to make possible to join www.google.com. Any other ...
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0answers
31 views

changing IP for specific host DNS entry in BIND for dedicated server [duplicate]

changing IP for specific host DNS example (test.com) entry in BIND to point to different IP let say my 2nd dedicated server IP. I have dedicated server hosting on data centre running BIND9, connected ...
0
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1answer
87 views

Captive portal detection by Apple Oses, iOS 'splash CNA popup' does not show?

I built a captive portal (Linux Debian router), providing a WifiHotspot based on hostapd and iptables rules ( like this: ...
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1answer
18 views

Connection from application on network share fails

EDIT: I tested some more...If I copy nslookup from the Windows directory to my mapped network drive, it cant' resolve hostnames: H:\nslookup dbserver (null) UnKnown Address: 192.168.0.195 If I ...
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0answers
12 views

response ping is expired in transit [duplicate]

I've configured my debian's network on virtual box: auto lo iface lo inet loopback auto eth0 allow-hotplug eth0 iface eth0 inet static address 192.168.56.15 netmask 255.255.255.0 gateway ...
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1answer
34 views

Import a vm image to a new host machine with virt-manager

I need to recover a guest machine with Windows 2003 on a new host server on Centos 7 with virt-manager. I've shut down a guest machine and simply copied its .img file from /var/lib/libvirt/images. ...
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1answer
59 views

Two network adapters for a machine to double the transfer speed [closed]

i am new to this. In my scenario, i have a desktop pc running windows 7 and planning to set up a local web server using xampp for big file transfer in the lab. The problem is that,there are 80 ...
1
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1answer
81 views

Millions of TCP FIN-ACK retransmissions blocking traffic on my desktop machine

In a few minutes I have received about 7 millions(!) FIN-ACK packets from IP address that belongs to Google 74.125.133.188 what totally blocked network traffic on my desktop(!) machine. Other ...
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1answer
39 views

Intermittent server LAN drop

I've been trying to hunt down a network issue we've been having for a while. We have two Dell T310 servers running Windows Server 2008 R2 on them. Quite a few users have complained that they get ...
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1answer
62 views

How to mount network drive as local disk?

I have some resource, which I can open by address \\dir\bin. I want to mount this resource on disk Z. In other words, I want to have path like Z:\file1.txt and get file \\dir\bin\file1.txt. I tried ...
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0answers
28 views

Creation of a guest Wireless network 802.1X - easy to configure out of the box on clients (android, ios, computers,..)

I would like to create a Guest wireless network with 802.1X (WPA enteprise). On the client side, it must be easy to configure, so the users can enter a login and password during the authentication ...
0
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2answers
29 views

Windows Server 2012 two out going connections

I have a server with several Ethernet ports. I have the first 3 bridged together for the local network. The 4th is plugged into the modem which is giving it a public IPv4 address. How do I tell the ...
1
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2answers
55 views

setting up linux router

I have setup three Ubuntu VMs in vmware. These are connected as: Now I want to use UBUNTU2 as router, so that when I run these commands in UBUNTU1, I get response from UBUNTU3, commands: ping ...
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12 views

Cisco 1941 HWIC Prohibitions

I recently upgraded our Cisco 1941/K9 router (see figure 4 here) to include an additional HWIC (HWIC-2FE) without issue. During my research for an applicable module to provision the necessary ports I ...
0
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1answer
69 views

HA-Proxy 301 re-direct: https to https://www

I am trying to have HA-Proxy 301 redirect an https domain. I need: https://example.com to redirect to https://www.example.com This is what I was trying to get it to work: # corp - example.com ...
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1answer
36 views

What does a switch do with invalid VLAN tagged traffic?

Say you're plugged into a switch that allows TAGGED 2; and treats UNTAGGED 5. However, say you tag your traffic 10... which isn't "valid" on that port. What happens to any traffic you send?
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16 views

No package transfer from host to guest on KVM

I want to assign external static IPs to my KVM guests. I do not prefer a NAT solution. What should be the configuration of network and routing tables? I manually assing a static IP to guest. I can ...
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59 views

Cisco 3120 blade switch does not boot after power outage

We use a Cisco WS-CBS3120G-S in a HP BladeCenter. After a power outage, the switch will not boot anymore. The switch dose not output anything on serial console. The LEDs SYST, STCK and active (under ...
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2answers
98 views

How to run two different IP ranges in one VLAN

Someone please help out of the mentioned scenario... I have a campus wide network which has COMPUTER LABS for Students, OFFICES, and Wi-Fi users. Out of all these I have 07 computer labs where I have ...