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

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Patch panel confessions

So the old IT guy was a college student with no experience prior to be hired beyond some classes. The one before him had no experience at all and just did his best with what he had. Now I am here and ...
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How to troubleshoot network bandwidth limitation

Using a dedicated server with 3gbps connection streaming, server crashes at 1Gbps. Pings go from 20ms to 100-500ms, server is slow or unresponsive, streams start buffering or drop. dmesg |grep eth0 [ ...
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How can one graphically view how vagrant boxes talk to each other?

I hope that this question isn't too vague. I'm looking for a tool similar to EtherApe that will allow me to visually see how the vagrant boxes are connected over the network. I tried using EtherApe ...
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13 views

VNC over SSH - which IP as tunnel?

I've seen plenty of examples involving some third server just for tunnel, or explain how to set persistent SSH tunnel independently from VNC itself. However I'd like to use native client ability to ...
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7 views

Error: Cannot open NBD: No such file or directory

I was testing nbd-client. Followed the steps as: server: sudo dd if=/dev/zero of=/mnt/dhini bs=1024 count=36000 $ sudo mke2fs /mnt/dhini mke2fs 1.42 (29-Nov-2011) /mnt/dhini is not a block special ...
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1answer
66 views

Is this my network being flooded?

I noticed this strange pattern on the bandwidth graph of the pfsense firewall on my work network: If I'm reading it righ, there is a constant stream of 6 Mbps data going from the local network into ...
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17 views

Network syslog with port number

I am collecting syslog from VoIP phones over the network and it is usual having several phones behind same NAT device. I need to collect syslog files to different files or be able to differ lines ...
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7 views

Virtualbox - how to custom NAT and port forward? [migrated]

How can I use Virtualbox custom NAT and also port forward? For demos, I am running my VMs behind NAT on my laptop. If I run it in the vanilla NAT mode, then each VM I spin up automatically gets ...
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40 views

Linux: Same static IP configured for all NICs

I am shipping some servers out to remote colo sites. I want to configure them so at the other end any port can be lit-up and the boxes will be good to go. I had originally been planning on bonding ...
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2answers
72 views

How to tell if someone is trying to use my IP Address?

I use a relatively low-cost host for my personal server, and occasionally I get a rash of downtime alerts. These are all from today. If my host were to ("accidentally") assign my IP to someone ...
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1answer
31 views

iptables slow down connections

When I enable iptables (v4/v6) for my server, every connection like ssh, imap, smtp, http, https and so on are slow down so if I try to connect to ssh, it tooks up to 30 (!) seconds. The imap service ...
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19 views

Terminal for remote control of PC [on hold]

For a transition period, we want the staff to remotely control their PCs, or they can work remotely on the machines. The PCs got centralized in a server room and the workplaces are only equipped with ...
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18 views

Tweaking my router [on hold]

Recently I brought a router "TP-Link 300 Mbps Wireless N Router (TL-WR841N)" and configuring it to use it with my ISP. My isp gave me a static ip configuration. So I put them in the router and it's ...
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19 views

Can I specify a port when connecting to a Windows share?

I have a network setup like this (Windows File Server) <-> (Windows Gateway) <-> (Workstation). I am trying to allow the Workstation to access a share on the Windows File Server. I was ...
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1answer
38 views

Private communications between AWS EC2 instances

I have three EC2 instances with elastic IPs. Each one contains a server. Each server needs that TCP ports 8181, 2181, 2888 and 3888 are opened on each machine. Each server should have the possibility ...
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3answers
25 views

Ubuntu / iptables: Using a server as middle-man to talk to firewalled server [duplicate]

I have a situation where I need to communicate with an API that only allows connections from one particular IP. So api.example.com accepts connections on port 443 from whitelisted-ip I want to be ...
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1answer
22 views

How to configure bridging

I am trying to configure a bridged network in a CentOS machine created with virtual box. I already did the same on two ubuntu 12.04 machines, and this is how the /etc/network/interfaces file looks ...
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1answer
39 views

Benchmarks for server response time [on hold]

I was testing my website’s performance on Google Page Speed and it mentioned the response time at It average between .6-.8 seconds. What’s the optimal server response time that’s acceptable? Is ...
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2answers
41 views

Trouble Connecting with Cisco VPN client reason 412

I'm using Windows 8.1 trying to connect to an Office using Cisco VPN. I try to connect and after a few seconds I get this: The Secure VPN connection terminated locally by the client reason 412: ...
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2answers
221 views

What problems result from servers not time-sync'd?

What problems might arise within a domain when the member servers are not properly time-sync'd? I'm aware that log entries are incorrect making troubleshooting more difficult in time-sensitive ...
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26 views

Unable to access ISP gateway user interface

I am hoping that someone can assist. I have a Windows 2012 Server that is a domain controller and serves local ip addresses out on our network (DHCP). Everything is working fine with the exception of ...
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0answers
30 views

Windows 8.1 stops responding to ping after user has signed off [migrated]

When i sign out of my win 8.1, it stops responding to pings from my other machine. This win 8.1 is installed on a laptop, so I guess this may be a power plan issue, but currently I have power plan ...
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1answer
65 views

cannot ping linux network namespace within the same subnet

Here is a quick summary of the issue. I cannot communicate with a linux network namespace within the same subnet. I am running Ubuntu 14.04.1 LTS on a headless server. I have been troubleshooting this ...
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1answer
112 views

Is it possible to process millions of datagrams per second with Windows, using a vendor agnostic API?

I am investigating if I can implement an HPC app in Windows that receives small UDP multicast datagrams (mostly 100-400 Bytes) at a high rate, using a dozen or up to maybe 200 multicast groups (i.e. ...
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1answer
46 views

WAN IP Ranges and NAT [on hold]

Let's say we have a router with a WAN IP assigned by DHCP: 1.1.1.1/255.255.255.255 The ISP subnet for it's lan interface is 82.5.167.161/255.255.255.248 My firewall behind this router is on WAN IP: ...
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23 views

Can not connect into a subnet across a StrongSWAN VPN

This is a simplification of a bigger problem I'm experiencing, but I think it covers everything. The production issue is between a StrongSWAN VPN and a Juniper SSG550. The network setup is clearly not ...
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14 views

Web request from different IP addresses on single network card

I have a windows server with 5 public IP addresses mapped to a single network card. When I run initiate a web request from this server, the request's origin IP always remains constant. How can I make ...
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27 views

Low TCP down speed on network interface

We have HP Proliant ML370 G6 server with 4 gigabit ports on it. 3 ports work well, but 1 (LAN1) cuts TCP Down traffic. TCP Up and UDP is ok. Here is the speed test result. Here is the windows monitor ...
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2answers
47 views

vSphere ESXi 5.5 Windows Guest Network card not active after reboot

Problem: Windows 2008 R2 or Windows 2012 servers have no network access after a reboot Not all VMs affected, but multiple VMs and mulitiple hosts. Windows Network configuration shows the correct ...
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1answer
22 views

Routing issue on Linux with Mobile Broadband

Note: This is a "cross-post", I asked this same question on "superuser" StackExchange site, but without obtain any answers, just a comment (now curiously disappeared). I've thought this site is ...
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43 views

kvm guest routing with 2 default gateways

I have a kvm guest with two virtual NIC. NIC with internal IP III.III.III.III (eth0) NIC with external IP EEE.EEE.EEE.EEE(eth1) I'm using macvtap. The host has his own external IP. I can ping ...
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Network problems, can't ping my mac [migrated]

I run VMware Fusion 7.1.1 and an Ubuntu server 14.04 on my imac 10.10.3 for web development. I have a thunderbolt Promise connected to the mac and mounted this on my ubuntu using smb, everything ...
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1answer
19 views

NAT forwarding (whole IP) working only on some ports

Since my hoster doesn't allow briged setups I had to go for a NAT solution to run my CentOS VM on an additional IP and my host machine on the primary IP. Now, I've got a problem since for ports 22, ...
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1answer
41 views

Two separate internet connections, two routers, one server and multiple clients [closed]

Recently we have got second internet connection from different ISP and now we are having a problem connecting our server to both routers which should be accessible from any client connected to any of ...
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15 views

Routing is disabled for LAN users while choosing all-net for IPSec tunnel

I have VPN with L2TP/IPSec server and tunnel configured. When I choose all-nets 0.0.0.0/0 to allow connection from any computer in the world, all LAN users with subnet 10.0.0.0/8 are disconnected from ...
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1answer
33 views

Share a folder programatically with custom credentials

Is it possible to share a windows folder with custom credentials (rather than a windows account)? I'm developing internet cafe software. I want to mount a desktop folder from a network share upon ...
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24 views

Total no. of hosts with 2 NATs in the whole network [closed]

How many hosts we can have with two NATs in the whole network if in IPv4 all the ip addresses are allowed to assign to a host in the network.
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17 views

GPON Gateway Settings

So recently my ISP installed optical fiber device. From the device description according to the gateway setting, it's a GPON Device The default package by the ISP is set to 4mbps. But when I started ...
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Need all local traffic through Debian - Routing? [migrated]

Been dealing with this for some hours now and my head are really spinning. So I got this cable network router (192.168.0.1) that Im trying to pass all my local traffic to. But I cannot for the life ...
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Slowness in Mac-based business network [closed]

My treatment room former dell PC/running vista business/ running the server and network versions of my Dental practice mgmt & X-ray capture apps, had no problems connecting to the front desk iMac ...
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1answer
36 views

How to schedule firewall to block wan connection on Windows 7 [closed]

I have a camera on my pc. There are 3 NVR (network recorder ) on different network connected to my cam throug WAN connection. I need to block any NVR from accessing my camera in different hour, and ...
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0answers
12 views

ESXi 5.5 - Management network with no gateway [migrated]

I'm setting up a test lab for VMware in Hyper-V. I have 3 vSwitches in Hyper-V: -EXT01 -INT01 -INT02 I've also created a W2K12 VM in Hyper-V which has the following roles installed: -AD/DNS -DHCP ...
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54 views

DNS problems with a static IP configuration in a VM [migrated]

I am using Parallels Desktop 10.2 for Mac on OS X Yosemite. I am trying to configure my my client (Ubuntu 14.04) to host a website that is available to the host via a particular domain name. In the ...
0
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1answer
46 views

why my nat iptables rules dont work with marked packets?

System: debian squeeze, Linux server 2.6.32-5-amd64 #1 SMP Tue May 13 16:34:35 UTC 2014 x86_64 GNU/Linux, iptables v1.4.8 lsmod | grep iptable iptable_security 2176 0 iptable_mangle ...
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2answers
36 views

Combining two subnets with same default gateway

This is the current situation: Subnet 1: 192.168.1.x (255.255.255.0) with default gateway on 192.168.1.1 Subnet 2: 192.168.90.x (255.255.255.0) without any gateway (no internet access) -> all ...
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1answer
56 views

Multiple DSLs connected to single HP server

networking noob here! Got a pretty specific question. Is it possible to plug 10 cat5 (network) cables that come from 10 different DSL modems to an HP server so I have 10 different broadband lines ...
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1answer
29 views

How to route VPN traffic through a separate internet connection with a SonicWALL firewall?

We have a depot quite some distance from the exchange, the expensive internet connection is only getting 2/1Mb. This causes constant drops as soon as someone downloads anything. We have now got a 4G ...
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1answer
23 views

Static route to Single IP using SSL connection

I am trying to configure a static route to a single IP. My question is two fold: How do I specify a single IP using a subnet mask x.x.x.x/? (not a range of ip's) My pc is making an SSL connection to ...
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23 views

Why would my logged public IP differ depending on the type of server (or computer) I am connecting to? [migrated]

I am writing a p2p gaming lan emulator that uses the torrent infrastructure to network peers, set up lobbies, etc. Currently, the only infrastructure we are using is the trackers (we plan to us Tox ...
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0answers
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Connect 1 computer with to 2 networks, route through 1 VPN [on hold]

Suppose the following scenario: I have a question, I am sure it has been asked but I do not know how to word it or what to look up. My Problem: I am a high school student of an advanced Video ...