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

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Sonicwall TZ205 with EnGenius ESB300 as Guest Wireless AP, Need to keep networks apart

I have a SonicWall TZ205 with an EnGenius ESB300 as a Guest Wireless AP. I would like to keep these networks segregated. Interface X0 is the LAN, X1 is WAN and the EnGenius is connected to X4 in AP ...
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19 views

Two users behind same NAT (PSK or EAP) - strongswan

I have a strongswan implementation and am running into an issue where when there are two users behind the same NAT, the second one "kicks off" the first one. I was able to resolve the issue using: ...
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1answer
21 views

Simultaneous outgoing connections limit with iptables not working

I run a website that technically acts as a proxy to another website (I make HTTP requests to it), and I needed to make sure not too many simultaneous connections were made, I thus limited it to 29 ...
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1answer
16 views

List network Docker

I was wondering if there is a docker command to list all the containers with their network? I know there is docker network inspect, but that's to inspect a network. I'm looking for a command that ...
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1answer
52 views

Windows RDP connection fails within 30-60 seconds of successful connection

Myself and several other users are having issues staying connected through an RDP session to one of our servers. Server lives in a subnet behind a proxy (cloud-based) Users connect to network via ...
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10 views

Can the VRRP ID of 2 different systems clash (keepalived and cisco/force10)

Since Keepalived and Cisco/Force10 both use VRRP, and use an ID Range of 0-255: 1) Would using the same number in the same vlan cause a issues. 2) Would using a different number in the same vlan ...
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15 views

No network on XenServer VMs

I'm trying to set up a CloudStack private cloud with advanced networking and I seem to have navigated most of the hard part. The problem now is my system VMs are not able to access the public gateway ...
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2answers
59 views

How can I determine which network adapter is SFP+ in CentOS?

I have a server which has an SFP+ module. We are going to utilize this to get 10gb speeds. I have adapters em1, em2, em3, em4. How can I determine which adapter is the SFP+ adapter in Centos 6.5?
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2answers
95 views

Is it possible to use IPv6 in my local network if my ISP is using IPv4

My ISP is using IPv4 and assigns IP addresses via DHCP. Is it possible for me to use IPv6 in my local network/subnet, and if so is it even worth it to do so?
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1answer
53 views

Dropped packets in all Linux and Unix

I have a problem. I have motherboard by Supermicro – X11SBA-LN4F. There are 4 ethernet ports. In first port i have internet. In second port i have my local network. When, i write "ifconfig" or "...
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18 views

limitation of 8 active port in LAG

i was going through Aggregation/EtherChannel topic and I got stuck in below statement "A dynamic LAG can have up to 16 ports of the same type but only 8 can be active at one time" any specific reason ...
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27 views

Linux machine gets different IP through and after installation

we have some automatic building of our building machines using packer (jessie, trusty, xenial, macos, ...) on separate network (VLAN on L3 switch which is used as default GW for the network). Till now,...
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20 views

Port forwarding from external providers in AWS VPC

I'm looking for general feedback regarding allowing external services access to your Amazon AWS VPC. I'm mostly wondering how other people go about doing this. If you're using an external service like ...
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1answer
22 views

netstat shows inequal amount of mutual connection between two hosts

I'm trying to investigate why the amounts of connections between two physical hosts 10.240.48.9 и 10.241.169.7 (CentOS 6) don't match each other (diagnosed from the each one respectively): On 10.241....
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9 views

How can I use instance discovery with openStack?

I'd like to use a service like TADDM to discover OpenStack instances. Unfortunately, this is tricky since OpenStack instances use private IPs. What are ways I can use to quickly distribute public IPs ...
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1answer
76 views

How to configure my linksys ES6900 as cascading router? [on hold]

I have a Linksys 6900 router and Amped-Wireless Access Point. My network is currently setup like so Modem > Router > Access Point I need to change that so that the Access Point will be the in ...
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2answers
131 views

Printer not reachable in network

i've a low-cost printer Samsung i provided to configure in my network. i gave it a static IP and connected to my AP. i can ping (and use) the printer only if i'm connected to the same AP. why can't i ...
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2answers
49 views

Can't access particular website on Windows Server, but ping works [closed]

In my Windows Server hosted in AWS, I tried to access a particular site from Chrome/IE and both browsers returned - the site can't be reached/the server refused to connect. However, when I try to ping ...
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1answer
22 views

How to use nagios to monitor a pfServer server?

I have a pfSense server set up as firewall gateway for my lab lan and dmz. Now I installed Nagios monitoring manager on a Linux server in lan and want to add a host target for the pfSense firewall. ...
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1answer
32 views

public interface not listening by default centos 7

I have two NIC on my system with centos 7 as OS. One interface is public with ip 172.68.122.120 (em1) and second with ip 10.11.15.20 (p4p1). Now When I reboot my system, bydefault, public ip is not ...
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1answer
87 views

Access Point Iptable/Route rule for allowing device discovery? Devices can connect manually, but not automatically. Multicast/Upnp issue?

I setup a wireless access point on my server and for some reason, everything works but automatic discovery features. I can't see any other devices, upnp devives aren't discovered, and I think it's a ...
2
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1answer
64 views

Internal network DNS can't be configed to route domain.com to www.domain.com? [duplicate]

We host a domain on the internet that is accessible outside of our internal network using domain.com or www.domain.com, but is our actual internal network domain as well, but the external website is ...
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19 views

Network issue in Compute node instance

We have two servers with Openstack Essex. Controller node a. nova-compute, nova-network, nova-volume, nova-consoleauth, nova-cert, nova-scheduler installed Compute node a. nova-compute and nova-...
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52 views

“No route to host” when i do a telnet in azure

I have two VM's in azure with different public IP's and whose private IP's are : 10.10.1.9 10.10.1.6 When i do a telnet with following command from the server 10.10.1.6, i get the a error: telnet ...
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1answer
56 views

Renewing public dynamic IP via Powershell ?- Azure Resource Manager

i need your help! I'm trying to renew a dynamic IP assigned to a VM, but i want to figure it out if there's some possibility to accomplish this via powershell cmdlets without being in the need of ...
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1answer
23 views

Basic Vlan questions

I've been "awarded" with IT infrastructure manager possition as I'm the "good with computers" guy in my small office. Nedless to say they have made a huge mistake, I have no clue.... I'd like to ask ...
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1answer
44 views

Azure vpn is establish but causing delay or no traffic sometimes

We are trying to establish VPN Hillstone FW (device) with Azure. VPN details are: VPN type: Policy based Gateway Subnet: 192.168.50.10/29 default subnet: 192.168.50.0/29 VM inet Address: 192.168.50....
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3answers
122 views

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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2answers
45 views

CentOS 6.7 vm static external IP setup issue

I have a new vm setup and have it setup like my CentOS 5.5 vm on OSX. 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 using Mac, ...
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1answer
124 views

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

Could down voter please post your reason, as it's not obvious to me? 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 ...
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14 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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1answer
56 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
15 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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24 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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1answer
62 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
55 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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17 views

Infinite loop of RST/ACK and ACK

I have web servers (Apache-Tomcat) at IDC to serve https requests from Android and iOS clients. Suddenly I noticed traffic to web servers was dramatically increased (10Mbps to 80Mbps). So I tried to ...
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33 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 ...
2
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1answer
56 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
77 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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19 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
53 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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1answer
62 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 ...
0
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1answer
67 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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93 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 * ...
2
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1answer
136 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
61 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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24 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
51 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
73 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 ...