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

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Network Interfaces Cards and rx_short_length_errors and Linux Kernel

My machine (Linux OS) is counting packets with wrong length, it is a huge environment (GW's, Routers, Switches...) , so I would like to understand how NIC's behaving with these packets. -Does NIC's ...
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18 views

Wake-on-LAN: Unicast is not working. Why?

I am facing a strange problem while setting up wake-on-LAN in our company network. The following is true for the workstation to be waked-up: WOL is enabled in the BIOS and in the settings of the ...
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6 views

IPV6 at home: my ISP delegates me a static IPV6 /56 subnet, how can I set up an IP scheme & DHCP6 for my network? [migrated]

My network looks like this: (Cable Modem/Router) <-> (PfSense Router) <-> (Internal Hosts) The IP (changed for security) of my cable modem is: IPv6 Address ...
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11 views

node.js on ubuntu 14.04 not responding to WAN requests

I've been working with node.js building a simple app that serves up some data in JSON, and decided to try setting up a proper server. I put Ubuntu Server 14.04 (32bit) on an old computer, along with ...
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1answer
49 views

firewalld vs iptables - when to use which

TL;DR On new CentOS server installs should I be using firewalld or just disable that and go back to using /etc/sysconfig/iptables ? firewalld and iptables serve similar purposes. Both do packet ...
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1answer
20 views

Installed a new Sonicwall at MPLS provider's DC, got it working by luck but have no idea WHY it's working like this

I'm nervous leaving the device like this because it makes no sense to me WHY it's working like this. We put in the new Sonicwall to replace an older Cisco ASA. Just did the basic setup, using same ...
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15 views

No connectivity between azure VMs

In my azure environment, I have 4 VMsx running Windows Server 2012 R2 10.0.0.4 (AD, DNS) 10.0.0.5 (ADFS) 10.0.0.6 (MSSQLSERVER) 10.0.0.7 (IIS) All of the machines are connected by an azure virtual ...
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38 views

Lan to internet IPv6

I have 2 iface Lan and Internet with only One IPv6. Over my lan I have a DHCP and DNS server ready for IPv6 support (I use DNSMasq). I'm On OpenVz CT but i can play with kernel module. I use ...
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1answer
26 views

Need advices on iptables

Helly guys ! :-) . I need a (several?) advice(s) from you about my iptables setup. I'm pretty new to iptables, and this is the first time I configure a server with iptables ONLY as a firewall (we ...
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1answer
12 views

Access Point config through static IP

My school have LAN cable for every dorm room, Computer want to access to inter net must set static IP and DNS. Mine as follow: IP: 10.107.31.99 Sub: 255.255.255.0 Gateway: 10.107.30.1 DNS: ...
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1answer
31 views

snort: drop icmp rule doesn't actually drop packets

I installed snort-2.9.7 from sources, and launch as IDS: % snort -devQ -A console -c /etc/snort/snort.conf -i eth0:eth1 Enabling inline operation Running in IDS mode ... The config file is very ...
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1answer
16 views

How to remove crypto-ransomware on my network domain

Today some computer on my domain got infected with crypto-ransomware and have infected some folders on file server that only some computers on network have access to. So I presume one or more of five ...
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0answers
24 views

VLAN configuration on HP J9279A

I've tried to set up separate VLAN for lab environment on one of my HP switches (J9279A/J9280A). Network schema: WAN | GW | ...
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1answer
18 views

Watchguard Mobile VPN with SSL - user can't connect - failed to open shared memory for openvpn command (error: 2)

I have a problem with my Watchguard VPN. I've set up the device for SSLVPN (added policies, users, a group etc.) according to this description from the Watchguard docs. The authentication itself ...
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0answers
16 views

Persistent error when installing windows server essentials in windows server 2012

I'm getting an error when trying to perform post installation configuration of windows server essentials in windows server 2012: An error occurred when installing Windows server essentials. Please try ...
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1answer
21 views

What exactly happens to packets written to a TUN/TAP device?

I'm trying to send packets to an application listening on eth0 from machine's user-space as if they were coming from a remote machine. What I can't seem to find good documentation for is the exact ...
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2answers
61 views

Rack Server Width

I am dabbling into the world of rack servers and trying to teach myself a thing or two. I have come to a roadblock about the width of a rack server, I have read that the standard width for a rack ...
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0answers
12 views

Fastest link between two TP-Link JetStream TL-SG3424P Switches [on hold]

I have 2 of these situated approximately 25 meters apart - what's the most performant method of connecting them together - straight CAT 6 or utilising the SFP ports?
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1answer
33 views

Routing on outgoing data packet in linux kernel? [on hold]

I am currently studying iptables. So far all the articles and howtos I have found on google/duckduckgo has only ever mentioned routing on incoming packets (passing the INPUT och FORWARD chain). I find ...
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1answer
21 views

What is the purpose of the apache address binding?

Apache virtual host configuration files are wrapped in a container like so: <VirtualHost *:80> # # Virtual host config etc... # </VirtualHost> Where the * represents the ...
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0answers
25 views

Limited Connection - Network Issue

I'm having issues with a Windows Server 2012 - Dell PowerEdge R300. Every time the server restarts the network adapter gets limited connection and does not work. I have to locally disable the network ...
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0answers
37 views

Connect AWS and Azure via OpenVPN

I am trying to connect two networks (AWS and Azure) together via OpenVPN. I am aware of other implementations (OpenSwan+Azure GW etc.) but I need maximal portability as I will be expanding this to ...
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0answers
5 views

Accessing localhost over WiFi by name [migrated]

This is my configuration: 1. Ubuntu 14.04 LAMPP server (localhost). 2. WiFi Access Point on ubuntu server. 3. Android device connected to WiFi access point. I can access localhost from android device ...
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0answers
19 views

VirtualBox: How to set up networking so guest can host servers [closed]

So i have problem with VirtualBox. My host is windows 7 x64 and on guest i tried linux ubuntu server and same windows 7 as host. internet is working fine and in my router i can see guest machine, but ...
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1answer
36 views

Performance Implications to Using a Full Class A Subnet

Let's say you have a small network (50-60 IPs) and assign everything a 10.x.x.x IP with a subnet of 255.0.0.0. This gives you a huge range of usable IPs. What performance implications will this have ...
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4answers
149 views

Replacing 100 MB Network Hub with a Gigabit Switch [on hold]

Our current network setup is a modem within the ONT box from Verizon FiOS which has 29 static IP addresses. We get 165 Mb per second from Verizon... This is connected to a Netgear 100 Mbps hub. This ...
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0answers
16 views

Extreme latency establishing MySQL and SSH connections host->guest using Virtualbox on OSX 10.10 [closed]

Running the latest version of VirtualBox on OSX 10.10 (Yosemite). Connections to services running on a Ubuntu 14.04 guest are extremely slow, regardless of VirtualBox networking configuration. I'm ...
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0answers
13 views

Why VMware Virtual Ethernet Adapter for VMnet1 not shown in Network Connection? [migrated]

VMware Virtual Ethernet Adapter for VMnet1, VMnet8 and Bluetooth do not show up in Network Connection's. Only the Wireless Network Adapter is shown! What could be the reason for this? Thank you for ...
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0answers
49 views

network administrator handover document [closed]

I am a software engineer, but unfortunately I need to handle company network. It’s a small company, around 40 people. Currently company network and security operations are handled by another ...
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0answers
3 views

Win 7/8/8.1 create wireless open/WEP network - any possibilities? [migrated]

I have a very old (2003) equipment that has Aironet/Cisco 350 network adapter on board (no WPA/WPA2, only open/WEP authentication). I need to connect it with PC (Win 7/8/8.1) without external access ...
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1answer
50 views

iptables and routing mechanics [on hold]

At what stages of handling a data packet does the linux kernel apply the different iptables chains and routing? I am looking for a schematic overview of the process.
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2answers
65 views

router: ping fails at specific time for 40 seconds

my network looks like this: ISP cable --- ISP modem/router (2 in 1) \ \--- my router --- wifi connection --- computer 1 \----------- cable connection ...
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0answers
25 views

New to networking and need direction [closed]

Folks, I have stumbled on this forum several times whenever I had some questions on networking. I am a QA by profession and recently I have this strong desire to learn more about networking. I would ...
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0answers
10 views

how to use isc-dhcp-server in place of router dhcp [migrated]

i have a virtual Debian installed on my VMware running on win 7 64 bit , i am using a bridged connection for my virtual machine , i installed isc-dhcp-server and changed the /etc/dhcp/dhcpd.config ...
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1answer
55 views

How to configure a bridge between two interfaces in Ubuntu server 14.04?

I am trying to configure a bridge between two interfaces em1 and em2 in Ubuntu server 14.04. This is my configuration: auto lo iface lo inet loopback auto em1 iface em1 inet dhcp auto em2 iface ...
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23 views

Determine is VPS is slow just through PING?

I'm running a severe issues on this site and I'm trying to see if the problem is at server side (just if VPS is slow or some kind of miss configuration) or software side (Wordpress). I'm not an expert ...
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0answers
52 views

Cisco DNS doctoring or Hairpinning?

I've the following configuration: CISCO 881, IOS 15.2(4)M6. On WAN interface is configured the 86.34.156.48/29 subnet from our ISP. Behind the router is staying 2 webserver. NAT: 86.34.156.51 <> ...
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0answers
36 views

Hyper-V guest VM disrupt host network connectivity

I'm experience strange connectivity issues on a Windows Server 2012 R2 Standard installation with installed Hyper-V role and one Server 2012 R2 guest machine. Whenever the Guest tries to access the ...
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0answers
15 views

802.11 standarts and guard interval

I have some troubles with 802.11 standarts. Supposing, we have AP and station connected to this AP. The parameters of wireless network are 802.11ac, 20MHz, ch64, for example. Short guard interval is ...
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5answers
49 views

Multiple Computers Running IIS with a Singular Public IP how to handle incoming communications?

At our company, we have three separate servers that house IIS currently. Each of these three servers have the same public IP address and essentially reside on the same network under different subnets. ...
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0answers
23 views

Forwarding traffic between interfaces inside a docker container

I have created a docker container executing the following command docker run -it --net=none --cap-add=NET_ADMIN --name firewall ubuntu /bin/bash after I have attached it two interfaces eth0 and ...
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1answer
35 views

OpenVPN all subnets the same, send a single client to tun0?

The two networks in question are listed here.. The wlan0 is on 10.0.0.23/24. tun0 (openvpn) is on 10.8.0.6 but is routing traffic to the network 10.0/16. So both wlan0, and perhaps tun0 could have ...
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0answers
13 views

when to use SCO communication link in bluetooth? [closed]

When transmitting an audio file in Bluetooth, is it sent using an ACL or SCO communication Link. Also if S1 is sending packets to S2 using DM3, these packets will reach the master first. My question ...
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27 views

Port Mirroring on Wireless router

I will be going on site to help hotel manager to identify who is using P2P (torrents) in hotel and abusing network usage for other guests. Easy option would be 1. Port Mirroring on wireless router ...
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24 views

Strange haproxy behaviour

So I'm trying to set up a dual site haproxy (1.5.10) on Ubuntu 14.04. http://i.stack.imgur.com/EtdYo.png When I do service heartbeat restart on eartha, both machines go green briefly; then earthb ...
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31 views

FortiGate 310B public ip pool into internal port

I have a FortiGate 310B with WAN port with /27 public IP pool from the ISP. The WAN port is configured with primary IP 1.1.1.1/27 I would like to provide servers within the Internal port a public IP. ...
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1answer
51 views

How to configure dynamic DNS updates when using stateless IPv6 addressing?

I am using Server 2012 with AD/DNS/DHCP. I have successfully configured stateful DHCPv6 however this does not accomplish what I would like to achieve so I disabled it and I'm currently trying to get ...
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1answer
35 views

Routing between two servers via a virtual interface

I have two servers, each running an openvpn service, the first one (uno) has the vpn range 10.170.0.0/16 tied to UDP 1194, and the second one (dos) has 10.180.0.0/16 tied to TCP 443. I would like to ...
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1answer
22 views

snort complains on local.rules

I just installed snort-2.9.7.0 on Fedora 20, and am getting error when running: % snort -c /etc/snort/snort.conf --dump-dynamic-rules=/tmp Running in Rule Dump mode --== Initializing Snort ...
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35 views

Connect DOS 6.22 Client to Wireless router USB Shared Drive

We have a DOS 6.22 client OS currently configured as NETBEUI. We would like to know if there are any wireless routers with a USB shared port for sharing files, that will allow a DOS 6.22 client to ...