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

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Windows workstations in a Windows domain with a Linux domain controller

There's a Windows network of about 60 workstations I am going to be responsible for. The network is in a terrible mess, so I decided to rebuild it from the ground up. Currently, there are some Windows ...
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1answer
12 views

Changing the default gateway, multiple NICs

I have Ubuntu 13.10 (kernel 3.11.0-19-generic). On startup, the network configurations are as follows: dor@ubuntu:~$ sudo ifconfig -a em1 Link encap:Ethernet HWaddr 44:37:e6:4c:ca:0a ...
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14 views

Firewall and NAT settings in GSM modem for one server

I have a GSM Modem (PSI-MODEM-GSM/ETH) in field with one device behind, acting as a server. The situation is as follows: "PC" | \_________Dynamic IP: 10.103.153.122 | ...
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6 views

consentry network switch removing security

I have a few old 'consentry network switches' that I can access the console on easily as they are at factory defaults. I want to be able to disable the lanshield security so any device can be plugged ...
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1answer
38 views

How to access device on switch from another computer?

I have several computers all connected to the same switch. Some computers are running RHEL, one is running CentOS. The CentOS machine is connected with NIC 2 to switch 2, and NIC 1 to switch 1. The ...
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1answer
21 views

Force all traffic from servers on the same bridge to pass through router interface

I have a bridge with all hosts from the 192.168.5.0/24 network connected to it.They all connect to this bridge via a secondary interface eth1. I have a router which connects this bridge to others on ...
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3 views

Not able to ssh into host from KVM guest when using user mode networking(default) [migrated]

I used virtual machine manager to create a Ubuntu VM which uses default NAT based networking still using the default address 10.0.2.2 I am not able to ssh into the host, neither can I connect to VM ...
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2answers
35 views

High throughput meshed VPN to connect datacenter hosts

We're renting a number of hosts in a public datacenter. The datacenter does not offer private VLANs; all hosts receive one (or more) public IPv4/IPv6 addresses. The hosts come with very modern CPUs ...
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20 views

Multiple gateways with linux on same subnet using single NIC

I have the following configuration; Firewall 1 (site 1); x.x.x.x/26 subnet on external 10.0.0.0/8 on internal (internal IP 10.0.0.10) Firewall 2 (site 2); x.x.x.y/26 subnet on external 10.0.0.0/8 ...
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1answer
22 views

how can I present a network diagram on the building that has 3 floors

How can I present a network diagram on the building that has 3 floors? The requirements are to separate the users in one LAN according to their department, what confuses me is on the second and on the ...
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16 views

How to setup properly host on IIS

Let me start from describing my network, since I think this might be crucial, so this is how it looks like: Other home devices. (static DHCP via MAC-IP bindings) ...
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13 views

Proxmox private network between KVM and VZ

Sorry for asking this eventually trivial question, but I'm fighting with this for more than a day, and was unable to figure this out by myself so far. Situation Proxmox host running a bunch of ...
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2answers
35 views

How to manage PING replies? [on hold]

How can I manage, for example, my Ubuntu mashine so it doesn't (or does) respond to PING(ICMP ECHO_REQUEST - type 8) requests? Normally almost all computers in a LAN network responds to ping with an ...
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1answer
37 views

Should Skype be reliable in a corporate environment?

I've move this from SuperUser after moderator comment. Its not a discussion. I am asking if my theory is valid. I have been managing the IT function in a small software development company that has ...
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0answers
22 views

Setting another computer on the network as a web server [on hold]

I've just setup my home network with a single laptop setup as a server (Ubuntu Server 12.04) which I can connect and share files via ssh with from my client laptop (Ubuntu Desktop 12.04). My server ...
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34 views

CentOS machine, not connecting to Internet only connecting to Intranet [on hold]

Recently i made some changes to my centos Machine so that now it is unable to connect Internet, but only connecting to my internel network. Here are my config files of my Centos machine ...
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3answers
210 views

How to capture contents of the first packet of TCP connections using tcpdump

I'm tasked with monitoring and debugging a SOAP web service, on network level. I can use tcpdump to capture the whole traffic coming from customers on port 80, but I can't limit the capture for every ...
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1answer
17 views

apache how to know if a download/upload is being processed

We've a web server used for heavy uploads/downloads (may take minutes). For doing maintenance disruption, we'd like to know if downloads/uploads are being processed at the current time. The things ...
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0answers
43 views

Multiple External Static IPs On Same Internal Network [on hold]

We have a block of 5 static IP addresses from our ISP. Is there a way that I can assign 2 different servers within our network different external IP addresses yet have them be viewable to each other ...
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19 views

kvm guest cannot initialize network

I'm running a kvm ubuntu guest inside ubuntu both 12.04. Using KVM manager for this. Initially everything was fine, could connect from the guest to the internet, the host all right. But all of a ...
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0answers
12 views

How build hotspot network and monitor with software on server? [on hold]

I would like to build a hotspot network. I will have several hotspot locations which are connected to a main office. In my main office I would like have server that checks the connection requests from ...
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2answers
72 views

Any gotchas when using the lowest and highest IP addresses in a small block?

OVH offers additional public IPv4s in blocks as small as /30, that is 4 IPs total. As I understand it, strictly speaking two of those are supposed to be unusable. However, OVH allows me to route those ...
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1answer
23 views

Add more than 10 vmnet in “vmware server” 2 [on hold]

I need to create an esxi 5.5 nested environment on win 2k8 and i would want to do it on vmware server instead of workstation. vmServer has "only" 10 vmnet adapters, but i've 15 nic on my physical ...
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0answers
36 views

debian multiple network interface multiple networks

I have a virtual environment with 3 virtual machines on one host. One of my virtual machines has 2 network interface. I need the virtual machine with two interfaces to connect to two different ...
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1answer
44 views

OSX Mavericks and Windows 7 missing files [on hold]

I have in a local Mac mini server running Mavericks which is acting as a file server for two windows 7 clients The files on the server are mainly images and are shared via SMB. Whenever I try to view ...
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16 views

What are the potential pitfalls of using a L3 switch as a router at an IX? [on hold]

TL;DR: Is there any direct pitfalls to using a switch as a BGP router? We obviously have routers for a reason, so what would be some comparison points between the switch and a proper router? What ...
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1answer
20 views

Accessing a container from another container using the public IP of the host

I've some issues configuring properly the network in proxmox. In short, from a container, I can reach any web server outside (ex: google.com), but I can't reach the web server on my container. The ...
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1answer
26 views

Windows Server - Redirecting Requests for Public IP to Localhost

I have a client that has a Windows Server 2008 box running two different set of scripts. One set of scripts is hosting several websites under several different domains. The other set of scripts is ...
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0answers
33 views

Public and Corporate Wifi - Sonicwall - Separate Public IP [on hold]

I'll start with the setup, and get to what this post is actually about. Business has a static IP block coming in (ADSL). We have Windows Server 2003 that is used for Exchange Server / DNS / DHCP / ...
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1answer
23 views

Restrict network connection to virtual machine alone-VMWare

Is there a way to restrict a Ethernet/Wifi Connection to the virtual machine alone and not to the host operating system? I am using VMWare workstation on windows with centOS and Ubuntu as my guest OS ...
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19 views

how to configure redistribution from static routing protocol to OSPF,EIGRP,RIP v2? [closed]

![enter image description here][1]in cisco packet tracer i have configured redistribution on back bone router of Ripv2 to OSPF,EIGRP,Static and from OSPF to EIGRP,RIPV2,Static . I got stuck in how to ...
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1answer
35 views

Debian 7.4 drops UDP traffic randomly

I'm running Debian 7.4, KVM VPS with the latest updates. I'm getting UDP ports randomly closed for 2-10 minutes for no reason. I'm running gaming servers and the port tester shows the ports are ...
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18 views

XenServer IP Failover OVH not working

I have got problem on XenServer with IP FailOver in OVH. I did everything what is in this official tutorial http://help.ovh.co.uk/BridgeClient and IP not working. On my VM is Debian 7 64bit I set MAC ...
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0answers
39 views

How to execute a reverse “Powershell shell” using ncat or netcat?

I am using ncat to execute a reverse "cmd" shell from one machine to another and without any issues using the commands: In my machine: ncat -l 443 In the remote machine: ncat <my ip> ...
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2answers
49 views

Raspberry pi with openvpn for a 5 user office can work? [closed]

My company have a lot of small offices around the world with between 1 and 10 employees and when they need vpn access to our network we have been using small barebone PC with Linux to work as ...
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0answers
21 views

VMXNET3 nic loses the ability to update ARP table after N hours

I have a fedora 18 VM that stops updating the arp table on eth1 after running for a number of hours to days. There are other VMs on the same hypervisor that can access all of the same networks without ...
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1answer
39 views

Improving “first copy” timing to distant data center?

Background: Our production rollouts comprise of below high-level steps. Take golden copy of code from single staging source. Stage code to multiple datacenters. Modify the staged code to have ...
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2answers
28 views

what does `pipe <number>` mean in `ping` output?

While running a test to diagnose some alleged network problem, I got this output from ping: --- r01c01b11n02 ping statistics --- 30000 packets transmitted, 29995 received, 0% packet loss, time 6309ms ...
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29 views

RJ45 to usb solution? Will this work [closed]

I need a console cable for a Accedian networks MetroNID. I bought this http://www.retrak.co/Products/tabid/80/ProdID/66/Language/en-US/3_Universal_USB_20_Cable_Kit.aspx Will this work to console ...
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1answer
27 views

Software for emulating networks and NAT

I am working on a software that I need to test with different types of NAT, and I would like to set up a test environment I can reconfigure in different NAT modes. I would like to have: ...
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1answer
33 views

“Destination Host Unreachable” and ARP returns no addresses over LAN

I am currently trying to setup LAN over two machines with a network mask of 255.255.255.0 however I am receiving the following message when trying to communicate between them both; [root@alpha ~]# ...
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1answer
67 views

Windows 2008 R2 - No internet access with static IP [closed]

We had an internet outage and when the ISP resolved the problem, we ended up with a server that no longer has internet access unless we use DHCP. I replaced the network card, thinking it might ...
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1answer
29 views

use do,while to make loop for each network adapter

I want to get RX and TX from each network adapter, so to get RX and TX from one network adapter, i used this commands : cat /proc/net/dev | grep 'wlan0' |awk '{if ($2) print $2}' | awk -v ...
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0answers
24 views

How to setup two networks on one Ubuntu server 14.04 [duplicate]

I have machine with two eth ports and I wish configure separate networks on them as mentioned below: eth0: ISP1 providing dynamic IP (default internet connection) eth1: Local network providing ...
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1answer
50 views

how to whitelist or deny “enable” mode IP address to cisco 3750 switch

I have a Cisco 3750 switch and I want to modify the allow/deny IP addresses that can access it in ssh and "enable" mode. Not sure how, and googling is nearly impossible to get this info it seems.
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14 views

Packet captures of OSPFv2 with HMAC-SHA1 (RFC5709)

I'm looking to get my hands on packet captures showing a hello packet from OSPFv2 configured to use HMAC-SHA1 for authentication, or to find software that supports such a mode that I could use to ...
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22 views

Routing through SonicWALL SSL-VPN and Cisco L3 Switch

In the image above, we use the SonicWALL NSA 3500 at our gateway and handle VPN with its SSL-VPN. Our Layer 3 Cisco switch is our core network switch and handles about a dozen VLANs. Most VLANs ...
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2answers
53 views

Spanning Tree Necessary With 2 Stacked Dell Managed Switches?

I have a PowerConnect 6248 and 6224P stacked with the 6248 acting as the managing switch. They're connected using the 48Gbps stacking module with 2 cables running between the switches. Do I need to ...
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3answers
97 views

Can a Hyper-V machine be made slower and/or emulate a slow network connection?

I need to reproduce an issue with a client-server asynchronous communication (a bunch of JavaScript AJAX vs. an OData api), seemingly caused by some race condition in the calculations when the server ...
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0answers
25 views

Can a 100Mbit switch throttle the internet connection?

We have a rather peculiar problem with internet speed in our office. Recently, we switched to a fiber-optic connection. We're supposed to have a 100Mbit connection (up and down). Here's how it has ...