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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Getting 2 different local subnets to see each other [closed]

This may be a question for superuser.com, given its intent, but that site isn't up yet. :) I'm using my MacBook's Internet sharing to share its Wi-Fi connection with my Xbox 360. This works, and I ...
0
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2answers
8k views

How to access an adsl modem/router in bridged mode? [closed]

My home network connects to my ISP through an ADSL modem/router in bridged mode. I have the following setup: | ADSL modem/router, bridged mode | | x.x.x.x public IP on WAN interface Router with DHCP ...
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4answers
240 views

Is this a secure setup for a home-based server? [closed]

I come to you from Stack Overflow in peace. My expertise is in development and I understand basic networking only, so please keep things in laymen terms. With that said, I'm going to hire a ...
0
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1answer
2k views

How to set up a dd-wrt router, isolating one ethernet port from the rest [closed]

I had this setup running some time ago, but it seems to have lost some setting and I can not find the original instructions anymore: I have a dd-wrt router with 4 Ethernet ports. I want to configure ...
0
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4answers
396 views

Access server by hostname without domain [closed]

I want to access services on other machines on my home network with just their hostname. In every browser, http://machine fails, but adding a period in http://machine./ works. Is there a way to avoid ...
2
votes
2answers
268 views

Guide to create a small business network? [closed]

Any guide/book/tutorial related to the subject of designing a network? It would also be helpful if it mentions using a cloud server. Edit: We want to move our server to a online destination. We are ...
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1answer
760 views

How to make high performance cluster out of 2 laptops I have at home [closed]

I have 2 laptops at home. Could someone please suggest some free cluster softwares using which I can make a HPC out of these 2 laptops so that when working on one of the laptop, I can use RAM,CPU of ...
0
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3answers
132 views

my proxy server isn't visible from outside of the network [closed]

I'm writing an http proxy server (homework assignment). I got it working on my home network but i can't connect to it from the outside. I've configured the router to forward communication on the port ...
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1answer
219 views

What is this thing I found in my wiring closet? [closed]

Apologies if this is the wrong place to ask this. My house is wired with Cat 5e, which is currently exposed as RJ11, which I want to switch to RJ45. I found this little guy in my wiring closet: ...
0
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5answers
44 views

Disconnecting connections to TCP server by external means [on hold]

I have a TCP server listening on some port on my box (Windows XP). There are many users connected to it. Now without bringing down server application or box, or without unplugging network cables how ...
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2answers
2k views

DHCP Relay setup in ubuntu server

I have a network appliance (QNO) that works as traffic load balancer and dhcp server. I would like to add a linux server in between the network appliance and the client computers. The linux server ...
3
votes
5answers
3k views

Stacking two Netgear GS748TS switches via HDMI - only 1Gbps trunk bandwidth?

I have two Netgear GS748TS 48 port gigabit stackable switches, which when stacked via two HDMI cables allow hosts on one of the switches to talk to hosts on the other. Netgear claim that the HDMI ...
1
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0answers
21 views

ping: sendmsg: Operation not permitted (sometimes)

On a Ubuntu 14.04 running Haproxy, after a service haproxy reload, Haproxy is suddenly reporting all servers behind it as down. After some digging around, I noticed that ping is not working properly, ...
0
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0answers
49 views

xen routed networking maximum segment size

For a few days now we experience issues with xen in routed networking mode regarding the MTU and MSS values (xen 4.1, debian wheezy, ISP is Hetzner) (network-script 'network-route netdev=eth0') ...
0
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0answers
40 views

Web usage monitoring [migrated]

We are group of friends working in shared wifi network. Can anyone of us monitor what other guys are surfing from their computer? Is there any tools or Admin right for such monitoring?
1
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1answer
14 views

Why some tcp_[rw]?mem$ voodoo show all equal values?

Looking at TCP optimization guides across the Internet, a common theme is setting the tcp_mem, tcp_rmem, or tcp_wmem three-integer vector to have equal values in the sysctl.conf file. Borrowing from ...
6
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1answer
2k views

Limit incoming and outgoing bandwidth and latency in linux

I realise many similar questions have already been asked, but so far I've yet to find a solution to my problem. I have a virtual linux server (running Debian Squeeze) that I use for testing of ...
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0answers
29 views

How to use net, netsh, netstat etc. to troubleshoot/monitor network [closed]

On Windows what are these commands: net, netsh, netstat etc? Can someone please brief how can these tools be used to monitor/troubleshoot server and network connections?
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0answers
9 views

How do I determine what bandwidth/speed I will need for a website (I know page size, # users) [duplicate]

I am trying to determine the connection speed I would need for my website and monthly bandwidth needed. How do I do this? I know: # of users per month (I'm fine with using this number as a "fact") ...
9
votes
7answers
3k views

Loopback to forwarded Public IP address from local network - Hairpin NAT

This is a Canonical Question about Hairpin NAT (Loopback NAT). The generic form of this question is: We have a network with clients, a server, and a NAT Router. There is port forwarding on the ...
1
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2answers
1k views

Smoothwall Express interface issues

I have a SmoothWall Express box that is currently configured with a Green and Purple interface. Both interfaces are in the same /24 subnet (which seems odd to me). The green interface (address of ...
2
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5answers
5k views

How do I know what processes are using the network?

Sometimes I can see heavy usage of network in my Gnome System Monitor. I wonder what process is downloading/uploading data. Is there any tool which can show me: what processes are using the Internet ...
0
votes
2answers
958 views

UFW/IPTables: after setting default outgoing deny, and port 80 outgoing allow, curl still doesn't work

With UFW, I disabled all outgoing and ingoing traffic by default. However, I do allow port 80 in and out: sudo ufw default deny incoming (deny all incoming) sudo ufw default deny outgoing (deny all ...
0
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0answers
30 views

Machine shows up in router but no responding to ping and any other connections [migrated]

Well, the machine is not technically a server, just a normal pc box running linux. I left that machine on in my apartment when I went home for the summer. However, about one month later, I realized ...
1
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2answers
2k views

Unable to connect via NetBIOS Name

I can't connect to machines/shares by NetBIOS names. Below is console output showing the problem. C:\>nbtstat -n Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] ...
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6answers
5k views

SQL Server 08 Express error when connecting to localhost - “Timeout expired”. Works with ::1 or 127.0.0.1

EDIT New info: Navigating to localhost:1434 in Chrome gives me an "ERR_EMPTY_RESPONSE", while other ports give me an "Oops! This link appears to be broken". So it seems to binding ok there? So ...
0
votes
1answer
15 views

Routing of pptp clients

I have just configured a PPTP VPN server in an AWS VPC subnet. However, I am unable to ping through to other hosts in the same subnet (as the VPN server). I am not sure whether I am overlooking a ...
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votes
3answers
55 views

3x networks, hardware in 2 locations, 1 connection to join them

Sorry it was hard to think of a title for this, so hopefully I can explain my situation. We have hardware (unix servers) on 3 different network subnets. For example: 10.44.1.0 10.44.2.0 10.44.3.0 ...
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0answers
9 views

ASUS RT-N66U how to identify source of traffic spike [migrated]

I have an ASUS RT-N66U as my home router. We are experiencing some traffic spikes in downloading over WiFi that slow all other activity to a crawl. Is there a way to identify the source (ip/host) of ...
2
votes
4answers
114 views

Can one server see traffic to another server inside a VLAN?

Scenario: I have a rack of servers that all belong to the same private VLAN. I transfer data from Server 1 to Server 2. Is it possible for any of the other servers to sniff out the data sent or is ...
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1answer
50 views

Hardware solution for small IT company [closed]

I'm starting up a small programming company for web development soon, so I have couple of questions and dilemmas in my mind. First of all should I go for standalone machines for each programmer or ...
1
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0answers
22 views

trying to reach a port forwarded server from the subnet using the public IP not working

I set up a server which is connected to my router. The router forwards a port of my server. So when I scan that port using http://www.t1shopper.com/tools/port-scan/ I got: 188.143.126.14 is ...
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1answer
45 views

Is there a dedicated server that is legal to ping frequently with a massive number of devices?

I have thousands of devices and all of them need to have some kind of communication pass through them every couple of seconds to stay active. Pinging is sufficient for keeping the devices active. Are ...
0
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1answer
58 views

What is the workaround for WMI remote connection failure with Access Denied error when client runs with Local System account?

What is the workaround for WMI remote connection failure with Access Denied error when client runs with Local System account? I tried to run script under local system account on the client which ...
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votes
2answers
57 views

How and why is PPPoE possible over a DSL line?

Typically (at least here in the UK), the authentication method on a DSL line is PPPoA. This makes sense, based on my understanding that DSL usually uses ATM mode, meaning ATM/AAL5 sits immediately ...
0
votes
2answers
27 views

IPv6: “Destination unreachable: No route” Routing error?

I've got an IPv6 address added to a bridge (sysctl has been configured to enable forwarding). However whenever I try to ping an IPv6 host it fails with the following error: PING ...
0
votes
0answers
18 views

Amazon VPN connection

I am using a netgear FVS336GV2 firewall and I have a comcast business router in front of it. After numerous phone calls with amazon support I have not been able to establish a vpn connection. I am ...
0
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0answers
26 views

OpenVPN Linux Client does not bring up tap0 interface

I have an OpenVPN client on Linux connecting to an OpenVPN server. The server assigns IPs via DHCP, thus I connect using the tap interface rather than the tun interface. OpenVPN connects, ...
0
votes
1answer
36 views

Connectivity between Windows 2012 VMs only possible with File & Printer Sharing

After trying everything I could find on the interwebs, the only way I could get two VMs on my Windows Server 2012 Hyper-V environment talking to each other was by enabling File & Printer Sharing ...
0
votes
1answer
14 views

VLAN inside Guest machine/domU

hi is it possible to create VLAN inside guest machines? using Xen 4.2 with Ubuntu as dom0,all guests are Centos On host i have 2 bridges in two different VLAN connected to bridge, virtual machine ...
1
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4answers
2k views

Having an issue trying to get Gigabit speed across my network (Ubuntu Server)

I've just started looking into the network speeds at my office, the entire network is setup to be "Gigabit". This includes Gb switches, Gb Network cards and Cat 5e cabling. I'm not expecting the full ...
2
votes
3answers
804 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, ...
0
votes
1answer
14 views

WatchGuard XTM510, Dialed in VPN (PPTP) users cant Ping hosted datacentre machine on BOVPN

we have a BOVPN from our network 192.168.1.0/24 range to some hosted environments at a datacentre. 172.15.0.1/20 any machine on our internal network ranges can communicate with the systems at the ...
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0answers
37 views

Mysterious ip alias

I wonder if anybody can explain this. I have another machine on the same exact subnet, which is reachable on a second ip, however no ip alias, bridging or anything like this setup on the machine. When ...
0
votes
3answers
101 views

Do I need public DNS records for the external IPs of our workstation NAT?

We have certain stakeholders who believe that the public IPs used by our workstations should have globally available DNS records, and that not having dns records would break some internet services. ...
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votes
0answers
27 views

Two Network Adapters, One Prevents Other's Connection [closed]

Digged up the forums but couldn't find the same issue, so here comes the question: My operating system is Windows XP. It has 2 network adapters. 1st: IP -> 10.54.88.55, Subnet -> 255.255.255.0, ...
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votes
0answers
23 views

Understanding how businesses connect web servers to internet [closed]

After using shared, cloud and vps hosting for my web applications I have made so far I was wondering how companies use their own servers for their websites. I know I could set up a web server on my ...
4
votes
2answers
157 views

If I join esxi to an Active Directory domain, how does it choose which DC to authenticate to?

I'm familiar to vSphere and large installations, and not at all familiar with the free products. Topology & configuration We have some branch offices that use ESXi and have a DC resident on ...
1
vote
1answer
112 views

Bonding more than 2 nics causes connection drops

I'm running CentOS 6.5. I have 3 servers with quad 1Gb nics. I'm using bonding mode 6 (tried 0 as well) running through a cisco 4948 switch. When only two network cables are attached, no issues. If ...
1
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1answer
23 views

Receive-side NIC teaming using LACP for use with NFS

I have a server with a 10G connection to a central switch. One NFS client has (2) gigabit NICS connected to the same switch. I'd like the NFS client to receive bandwidth of 2Gbps from the 10G server ...