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

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Inter VLAN Routing Issue

Here's my setup 3 Networks across 3 switches (3x C3650) 10.7.64.1.x/24 (Vlan 7) 10.10.10.x/24 (Vlan 20) 192.168.1.x/24 (Vlan 15) The switches are all connected to each other, with Switch one have ...
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13 views

Multiple IPv6 addresses added to interface, now IPv6 not working on my server

I got /64 IPv6 block from my server provider. When I add few IPv6 addresses (maybe 10 or 20) to network interface. Everything works fine about IPv6 network. When I'm added above 500+ IPv6 addresses ...
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9 views

Get-WmiObject Win32_PerfFormattedData_Tcpip_NetworkInterface results in 'Invalid Class' error

On of my Nagios plugins to monitor the network load gives me problems on one Windows 2008 R2 server (out of 600). You can download the plugin here: ...
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2answers
41 views

what makes two networks different? [duplicate]

When can we say two networks are different from each other? Is it when they have different subnet masks or when they use different policies? Will it be right to say that a router is needed to connect ...
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1answer
6 views

systemd-networkd not recieving DHCP IP in cloned container

I am trying out LXD, and created a barebones Arch Linux image from scratch. It works perfectly the first time the image is used, but cloning the container or reusing the image causes networkd to not ...
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30 views

Cannot connect to VPN

I am not able to connect to my vpn using the built-in Windows 10 Pro x64 VPN client. I am out of ideas. When I try to connect I get "A connection to the remote computer could not be established, so ...
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1answer
38 views

how to make server visible from internet

I have ADSL router with Static IP from my Internet provider. I know that, if I connect my server to router it can be visible from internet (working webserver etc.), but how does clients getting page ...
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2 views

YAST is trashed and wirless networking stopped [migrated]

Running openSUSE 12.2 Mantis for some time with no problem until now.It will not load up wireless network and YAST appears trashed, with this error message anytime I try to fix it. "terminate called ...
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1answer
14 views

sharing more VPN connections on several computers in LAN

my LAN looks like this: router 192.168.0.1 router (default gateway, connects whole LAN to internet) pc2 192.168.0.2 Linux pc connected to external VPN No.1 pc3 192.168.0.3 Windows pc connected to ...
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8 views

home and vmware lab on same subnet (AD) [migrated]

I have a question about network topology. Namely, I wanted to set up a cluster vmware for testing SQL Server: fail over, always-on etc ... But I do not know how to reconcile this with your home ...
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28 views

SYN flood on mysql server

Consider this structure: DB <-TCP3306- WEB{1,2,3,4} All servers are CentOS 6/7 Web servers are running PHP (using php-fpm) that connects to the MySQL server. Occasionally, I get this error ...
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1answer
21 views

How do I host a registered domain with bind9?

I'm already hosting my own web server, FTP, etc. and I want to be able to link my domain name myself directly instead of configuring all subdomains and redirections on the registrar's DNS. Is it ...
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17 views

making copy of one server to another [on hold]

I have three identical hardware machine. I want to install and configure centos server on all machine. I need to have exactly same configuration. After some research,I know there is a way of making ...
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1answer
40 views

Guest VMs cant reach each other on Different ESXi Hosts in Datacentre

I have two vSphere EXSI 6 servers both setup with the same vSwitchs and connected to the same physical switches Server 1: eth0 => vlan143 (mapped to CORE/Management vSwitch) eht1 => vlan140 ...
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22 views

Getting the list of WiFi networks broadcasted in awindows PC from Linux PC [on hold]

Assume that there are 10 Windows laptops and two linux PCs are connected in a wired LAN in a remote location. Is it possible to view the broadcasted WiFi networks in wireless adapter of Windows ...
1
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1answer
28 views

Port forwarding in pfSense not working

I recently set up a pfSense router and can't get any port forwarding to work from outside my own LAN. I have the following forwarding rule to a local server located at 10.0.1.2: Note that if I ...
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7 views

SQL Server semaphore timeout period extended procedures fails unless non-standard port

Querying my SQL Server 2012 database on Windows Server 2012 using extended/metadata procedures fails when connected via SSMS using a VPN with the following error: TCP Provider,error: 0 – The ...
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33 views

Drop in the internet access [on hold]

The real issue that I am having is the internet access not the network access itself. If I access to any network drive or location, the speed is great. But when I try to access the internet it is so ...
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0answers
16 views

Add new subnets to KVM Host

I need to assign a handful of /27 subnets to my KVM host node (Centos 6). I routed them correctly at the Cisco switch, so that's all go. Traceroute & ping works fine on gateway on each subnet, ...
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0answers
18 views

how to redirect domains to localhost iptables [on hold]

i wanted redirected all the traffic on my network to localhost. currently i am trying to use iptables to do so from below command.. iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j DNAT ...
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0answers
37 views

Can't access website from belgium [on hold]

Since a while, the orientaeuro.eu website is not accessible from Belgium, I can only access, from other countries IP adress. Also the hosting (argentinian provider) is not accessible from here. Do you ...
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2answers
25 views

How to Point DNS to Machine Behind Router

I purchased a domain on namecheap (lets just use www.example.com). I have a CentOS virtual machine with a bridged adapter on my LAN. I'd my domain to resolve to that CentOS machine, but I don't know ...
3
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1answer
47 views

Find network percentage of NIC [on hold]

So I have created a Linux resource monitoring tool that pulls various resource information. One of the fields I am trying to pull is the percent of network throughput on my NIC. So if I have a 1 ...
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0answers
29 views

network access issue and triage

We have two hosts in same vlan with same route rules. One of them is able to connect to an outside IP while on another I get failed: Connection timed out when testing the connectivity through netcat. ...
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1answer
35 views

How to Map Network Drives Using Logon Scripts & Group Policy Objects? [on hold]

I want to know how do I map network drives using the logon script method and the group policy objects method? If anyone could post me a in depth answer for going about these methods and explaining the ...
2
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0answers
30 views

Windows treats mapped drives differently based on host server type (Netware vs 2008R2), file create issues

We have a ~30 PC heterogeneous network environment. DOS, Linux, OSX, Windows 98, XP, 7 , and 10 clients, to name a few. The question: How can I get Windows desktops to treat Mapped network drives as ...
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0answers
9 views

Home network - do I need QoS? [migrated]

I'm planning to install a home network with the following hardware: Netgear UTM50-100 ProSecure Netgear ProSafe JGS524PE (24 Port switch, 12 Port PoE) ESXi Server w/ 2 VM's (AWS Storage Gateway ...
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1answer
21 views

how to find out the clients connects to the proxy server in redhat linux

Is there any way to find out the client machines connected to the particular proxy server in redhat linux , i am using redhat linux version 6 and squid configured in it
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1answer
49 views

TCP connection; ACK not received

I am having trouble sending mail from Linux to Exchange server. When I telnet from Linux to Windows on port 25, I am not receiving any message from Exchange. The connection is automatically terminated ...
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0answers
37 views

What's your experience with the AWS NAT Gateway performance?

In December/2015 Amazon launched their VPC NAT Gateway service which is basically a managed alternative to creating your own (and it looks very good in comparison to NAT instances). I was just about ...
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1answer
21 views

How to access a pc on local network from main network [closed]

We are in college and every room of two people has only one lan port. We belong to a college subnet: 172.31.80.218/26 Now I am connected to our lan port and have the above IP. I create a wifi hotspot ...
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23 views

fail2ban doesnt read log if file being used

My environment is Ubuntu 14.04, LAMP stack all from apt. implemented fail2ban and configured jail.local with backend = auto [ssh] enabled = true port = ssh filter = sshd logpath = /var/log/auth.log ...
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0answers
17 views

MySQL proxy authentication options

I have a farm of production mysql servers that are currently protected by restricted passwords. I would prefer to restrict access to these systems at network level, but have to account for the fact ...
1
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1answer
23 views

Routing via sub-interfaces not working?

I'm trying to isolate outbound network traffic to a specific target for metering purposes, so I thought I'd route it via a dedicated IP address. In order to achieve this I have setup a subinterface ...
0
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1answer
22 views

Infiniband switch, uplink

Regarding switches like Mellanox Voltaire VLT-30011 (QDR IB, managed). I see a gigabit ethernet port on the switch which in the manual ...
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0answers
21 views

DHCP: bad configuration fixed-address?

My configuration of DHCP is: dns-update-style interim; default-lease-time 86400; max-lease-time 86400; authoritative; log-facility local7; subnet 192.0.1.0 netmask 255.255.255.0 { pool { option ...
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0answers
22 views

remote conection via gsm 3g to bar code scanner and a bananaPi or RasPi linux machine [closed]

I'm trying to figure out how to connect a linux SBC to a USB bar code reader for use out in the field.Ideally I'd like the scans to be sent to me and be able to access them on a server while they are ...
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0answers
22 views

Lags on a specific Windows 10 installation over MS VPN

I have a Windows 10 machine that is connected over MS VPN to a company intranet. All traffic to this company intranet and to the internet go over the VPN. When using remote desktop over the VPN the ...
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0answers
29 views

Network layout advice needed

I have been doing some research, I keep reading about source guard on Cisco for segregating subnets and only allowing certain ports access to an IP Address range. However, I don't use Cisco switches, ...
2
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1answer
70 views

Pinging Hostname results in reply from 2 different IP addresses

I have an odd behaviour on my Windows 2008 R2 server, when I ping a hostname of another system, my first reply has a different IP address then the following replies. For example, if I was to ping ...
2
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0answers
30 views

Ubuntu Network Performance on over 2k connections

I'm using an EC2 c3.8xlarge Ubuntu 14.04 LTS machine with over 3k threads simultaneously downloading web pages one after another. Although this machine should have a 10Gb network performance, I ...
2
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0answers
36 views

How to use an IPv6 Edge router in an IPv4 network?

Background I have the following set-up: I use 6LOWPAN (IPv6 implementation in IEEE 802.15.4) on my sensor link that have IPv6 addresses (stateless) as aaaa::xx/64 It uses RaspberryPi (RPI) as an ...
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1answer
22 views

Need some clarification on a NIC functionality on a Dell Poweredge r610

Quick question. I'm trying to understand the NIC functionality of this server. NIC specs from manual: My question is, do the two broadcom controller chips provide fail-over redundancy? For example, ...
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0answers
12 views

Dell R710/C1100 For a Rendering Farm? [closed]

I own a data center in Los Angeles and have an abundance of Dell R710 and C1100's that I have been renting as dedicated servers. I would like to deploy a rendering farm here as well. From what I have ...
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1answer
50 views

port listening in netstat can't telnet

I'm trying to connect to port 8020 on a CentOS vm but I'm getting telnet: connect to address <public_ip>: Connection refused when I run telnet public_ip 8020. When I run netstat -anp | grep 8020 ...
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0answers
22 views

IP Address and Dom0 IP Address

What is the difference between normal IP address and Dom0 IP address? As far as I read so far, Dom0 IP is associated with VMs instances but I want to know if it there is a subtle difference here.
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1answer
27 views

port forwarding by iptables failed

I hope to forward from 192.168.1.230:9090 to 192.168.1.231:8080. I execute the following command: iptables -t nat -A PREROUTING -d 192.168.1.230 -p tcp --dport 9090 -j DNAT --to 192.168.1.231:8080 ...
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0answers
24 views

How to set up a subnetwork of a subnetwork? [closed]

I have a network cable that is plugged into a single computer in office, now we have three. We typically use a network switch to create a network, however, this time it was different as according to ...
1
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2answers
56 views

Azure Virtual Machine can't serve websites

I am unable to get an Azure VM running Windows Server 2012 to serve up the IIS default website from it's public static IP. Created a VM running Win Server 2012 R2 and installed web server role. ...
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1answer
41 views

First ping (to any destination) fails from switch but not from router

I've got a basic network setup, just doing NAT to a single public address to an internal /24 without any VLAN's or fancy routing. Both my router and switch are running Cisco IOS 12.x. My ...