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

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Forward traffic between VLANs with iptables

We're having the following 4 VLANs on my network, connected to an Ubuntu Linux box with DHCP. This Linux should act as the L3 router as well. VLAN 10 on interface eth1.10 with subnet 10.10.10.0/24 ...
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1answer
23 views

CentOS 6.7 vm static external IP setup issue

I have a vm setup and have setup like my CentOS 5.5. It is a strange setup since we used Comcast Gateway as the router and I really don't want to change that since we're Mac and Apple routers only ...
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1answer
46 views

Any tool for forking/teeing/sharing a TCP connection to the remote server?

Here's my problem. I'm building an automation program that talks to a remote server (think of it as a chat server or MUD game server) through TCP. While my automation program is doing its thing, I ...
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6 views

Firewall-Rules on Proxmox-Node cause VPS to be offline

I'm using proxmox to virtualize some small machines based on KVM. To do so I created the following network-config on the KVM-VPS: # This file describes the network interfaces available on your ...
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0answers
9 views

configure docker network bridge IP for multiple IP alias

I got a Ubuntu host with multiple IP address aliases and I want to expose the ports from docker containers connected to one docker network bridge to a specific IP address of the host and the ports ...
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0answers
7 views

What is the default value for TCP accept queue length on Linux?

I have read this article but it doesn't mention where the default accept queue length can be found (it does mention tcp_max_syn_backlog though, but it's different). I'm working on a Java 8 project ...
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0answers
14 views

captive portal on a router for guest acess to WiFI

I'm setting up a WiFI network in a snmall boutique hotel using ubiquiti uap-ac-3 AP's and a managed ubiquiti tough switch. I would like to set up an internal webpage with captive portal so customers ...
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6 views

LDAP Server cant talk with network printer

Recently we replace network printer hardware fuji xerox with another model and we put same configuration as like before but in new print server having issues connecting with LDAP server user cant go ...
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33 views

Viewing current network connections/traffic in real time, inside a datacenter/cloud [on hold]

Context I am starring blankly at my list of instances on Amazon. Hundreds and hundreds of computers in the wild, talking to each other. At least that's what I suppose. The truth is I don't really ...
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0answers
10 views

How to start ubuntu server with wireless Internet connection? [on hold]

I have an Ubuntu Server 14.04 installed on my system. Whenever it boots up, it requires a wired connection from a router to complete the boot process. If the connection is not present, it waits for ...
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11 views

Route to Internet router from different subnet [on hold]

I ran into a situation where my network is setup like the following: my network In this image my Computer A is connected with WiFi DSL router which is connected to the Internet. Computer A and B are ...
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19 views

Large payload - connection get's Hung with CLOSE_WAIT or LAST_ACK state

We have a webservice client which posts data to a 3rd party Webservice. We are having an issue when the payload is a bit large (Around 600KB) xml. Once we pay the process hangs forever. The Netstat ...
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46 views

Multiple Gateways for Single Subnet

Right, this might be a long one, so bare with me... I have 2 machines, lets call them local1 and cloud1. local1 has 3 Nics: 2 connected directly to cable modems with public IPS (call them eth0 and ...
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1answer
25 views

proFTPD unable to connect after update ECONNREFUSED

I am working on Debian 8 - ran a series of automated system updates and now I am unable to connect to my local server running proFTPD. I have made no changes to the client attempting to connect to ...
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0answers
46 views

Win Server 2012: Keep Network mapped drive mapped at all times

I'm trying to get the backup working for valuable client data, I have a server that is hosting client data, and are using Microsoft OneDrive as a Mapped drive... But I think the task scheduler is ...
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23 views

LXC containers cannot connect outside of VM

I have two CentOS 7 LXC containers on a RHEL 7.2 VM using virbr0 as a virtual bridge. Originally, container1 could connect out and do e.g. yum installations, but after I created container2, neither ...
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0answers
34 views

Possible to force TCP window scaling to a higher value?

Is it possible to increase the TCP window scaling factor on Linux (CentOS 7.2)? I have a long fat network (100 Mbps) from London to Chicago and I'm getting 16 Mbps throughput in TCP on an sftp from a ...
3
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1answer
56 views

HP ProLiant BL460C Gen9 - NICs

Is there a way to get more than 4 physical NICs (4 active/4 standby) on an HP BL460c Gen9 server WITHOUT using mezzanine cards and extra VCMs? EDIT for more information: I have two c7000 enclosures. ...
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13 views

Using the host inet address to connect containers

Running an Ubuntu 16.04 server as a docker host. One of the services I start has the following run script. #!/bin/bash # retrieving the inet address INET=`LANG=c ifconfig | grep -B1 "inet addr" | ...
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1answer
41 views

How can I connect a group of vms in Azure?

I have a number of Azure Linux VMs. I am able to ssh into all of them using the public azure connection info, however I am not able to ssh from one vm into another vm using the private info. I have ...
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0answers
13 views

Detecting Bots Who are sending Spam Mails via Webmail

I am working on spam Detection done by botnets. Some Information Recently,I came through a techique to detect the spammer in my network which is based on the anamolous amount of MX queries,outbound ...
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1answer
35 views

Slow file transfer speeds

I have a server that is running Ubuntu Server 14.04LTS and I am currently experiencing slow network transfer speeds. This server had been running without issue now for about 2 years and suddenly I am ...
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1answer
28 views

libvirt: set hostname using dhcp in virtual network

I've configured a host-only (aka private) network for a group of VMs on a CentOS 7 host. I've created static leases in the DHCP section for the virtual network. The IP address is getting set ...
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0answers
53 views

IPv6 not working

I'm unsure as to why this is happening... anyway, let me start from the beginning The Setup 1 * Dedicated server with a /29 IPv4 and /48 IPv6 (from Nocix (DataShack)) 1 * CentOS 7 KVM host 1 * ...
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0answers
31 views

Port forwarding/ssh [on hold]

I have a question about port forwarding. In my case - I need serverB to be able to communicate with serverA over port 9090. The problem is that serverB can't not connect to serverA over this port. ...
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0answers
8 views

Is Weave the only Docker overlay network that supports multi-hop routing?

One of the features of the overlay network Weave is the support of hop-routing. I couldn't find any other Docker overlay networks that support this feature. Not even Docker's native networking library ...
2
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1answer
87 views

Tune windows for high latency/high bandwidth tcp transfers

How can I speed up my Windows 7 tcp file transfers over a 100 mbps link between Chicago and London? Right now, I am transferring two 4GB files in two sftp sessions. Each file transfer is running at a ...
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2answers
57 views

Can't ping between two VMs

I have two VMs that, up until yesterday, have been able to talk to each other just fine. Now they don't. I've been trying to get this fixed for several hours now, but haven't been able to figure ...
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0answers
12 views

PPTPD VPN Can't connect to the internet

I'm running a Ubuntu 16.04 Server on a VMWare ESXI Server with its own public IP, I have setup a pptpd vpn server which works but only with connected devices. I can't connect to the internet with it ...
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1answer
47 views

Network maps, best admin practises and how them saved your ass?

I am reviewing the security of a (quite large) network. There are a some thousands switches, several hundred routers, several hundred access points, tenths of FW, IPS, and so on. PCs and servers are ...
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1answer
48 views

How to secure dual-homed Windows Servers that are connected to the internet

We have two machines running windows server 2012. Both have one NIC port connected to the public internet and another NIC port connected to a switch with internal IPs (192.168...). What is the most ...
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16 views

Communication between two PCs [closed]

I need to make two PCs communicate using Ethernet connection. I am quite new to the field. I want to know what mechanism would be the best; Client-server, P2P, Uni-cast or multi-cast. Or the later two ...
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18 views

Subdomain lagging on certain networks [closed]

I am experiencing lags in accessing my learning management system (LMS) on some networks. The LMS is in my company's website subdomain but is hosted on a separate server and the issue appears to be ...
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0answers
20 views

sql server 2000 not using maximum available network bandwidth [closed]

I have a program written in delphi that uses sql server 2008 as database engine.when I run a specific query inside of the program, the network monitor shows that the client is grabbing some data from ...
2
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3answers
42 views

VisualSVN server visible on internet, but not all subcommands work on client

So my boss is a nice guy who's open to trying new ideas, and I talked him into letting me start new projects on svn (instead of an older version control system). At this time, we've realized that it's ...
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1answer
27 views

Can I create an Ad-Hoc network between NAT virtual machines and computers/virtual-machines external to host? [closed]

I want to create a network between virtual machines on my laptop which are running Windows Server and other virtual machines in another laptop that will be running Windows Server as well without using ...
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1answer
150 views

Huge performance penalty in gbit link with ip forwarding / masquerade through clear VPN tunnel

I have a problem with IP forwarding between my home computer and a remote server (from online.net). My home connection is a 1 Gbit/s FTTH and the remote server has a 2.5 Gbit/s bandwidth. The context ...
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22 views

Set-up VPN using DD-WRT router

I'm trying to set-up a VPN with a DD-WRT router in a Windows 2012 environment. I followed the steps from DD-WRT wiki 2, but I can't manage a connection. Firmware: DD-WRT v3.0-r28788 std (01/13/16) ...
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1answer
30 views

duplex affecting bandwidth test, router--switch--NIC

Netgear FVS336gv3 router, 50x50 dedicated fiber. ISP instructed us to set WAN port speed to 100mbps full duplex; done. Router connected to Netgear GS748T 48-port switch. GS748T port set to "auto" ...
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votes
0answers
31 views

The shared server content disappear in network folder of client

I've recently set up a server at the office using windows server 2008 R2. Up to now, I have successfully added 3 clients to the domain (1 pc and 2 laptops). Yesterday I was trying to add another ...
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0answers
11 views

GNS3 - Connecting Emulalated IOS to TWO PHYSICAL networks

I have a CISCO c3725 router on GNS3 connected to two different and separate unique LANs via the CLOUD/HOST icon, attaching each of the virtual CISCO c3725 to my computer's physical NIC (NIC 1 and ...
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0answers
23 views

Outbound traffic limited to ~2MBps across multiple gigabit links

I have a server running FreeBSD 10.3 with a Supermicro MBD-X10SLA-F-O motherboard, which has dual gigabit ethernet ports, and two Intel PWLA8391GT PCI gigabit cards. I've been running FreeBSD on it ...
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0answers
23 views

linux veth use existing peer interface

I have a sit tunnel interface which I want to transparently connect with one end of a veth pair so that everything that drops out of the tunnel interface flows through the veth interface and vice ...
-2
votes
0answers
39 views

One Physical Machine hosting Hyper-V Server 2012 R2 and Thin Client connected to VM Server [migrated]

I apologize if there is already answers to this question. I looked for hours but was unable to find a solution through multiple trials and errors of possible solutions online. Configuration ONE ...
2
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3answers
34 views

Override AWS Auto-assign Public IP settings after instance launch

There is a limit to 5 public IP addresses (Elastic IPs) for each AWS Account and I have reached such limit. Now I have many EC2 instances created without the "Auto-assign Public IP" attribute, which ...
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0answers
64 views

IMAP Login: Server Certificate not installed. BUT IT IS! AFAICT

5/25/16 Continuing the struggle. We have done much wonderful work, and all the port 80/443 virtual hosts are singing and dancing. Life is good. But as for the poor port 143/993 IMAP email server, ...
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16 views

Ubuntu 16.04 LXD No any communication between guests and master

Welcome. I had a little problem with my LXD server. On my master I have some guests systems (ubuntu 16.04 image), all of them are bridged to master and are in my local subnet at home, and have an ...
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0answers
18 views

Can't reach centos server after “Multicast listener report” IPV6

I ran into a problem that occurs only on a few servers. Every 5-6 minutes I lose connection to the server, and it get backs after a few minutes. In most cases it's a VM that is not reachable while ...
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2answers
31 views

Debian / IPv6: Default route expires after 1800 secs, loosing connectivity

I'm running Debian 8 on a vServer. After installing docker and enabling IPv6 i noted something strange. I don't know if docker has anything to do with this, it's just that i noticed this problem after ...
2
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0answers
90 views

How to verify network quality before running important benchmarks?

I have multiple CentOS servers around the world. They all are running a PHP script that tests the latency of some services once per minute. The problem is that sometimes these servers have local ...