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

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netgear WNR2000v4 SquashFS read-only file system [on hold]

(I hope this is a better place than superuser to ask this question) I've made it this far in trying to get openWRT on my netgear WNR2000v4. I got telnet enabled, and downgraded the firmware to do ...
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6 views

Reduced network throughput between linux guest and windows host

I'm running a CentOS 7 Linux VM in VirtualBox. A client application runs in the guest and a server application runs in the Windows 10 x64 host. I had a performance test whereby the client invokes a ...
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network device enrollment service greyed out

I've recently installed AD Certification Authority on one of our DCs. It acts as a subordinate enterprise CA, the Root CA is a standalone offline root CA and there is no connection between those two ...
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1answer
30 views

What should i use instead of eth0:1 if it is deprecated

usually i create /etc/sysconfig/network-scripts/ifcfg-eth0:1 and /etc/sysconfig/network-scripts/ifcfg-eth0:2 but i seen in internet that it is deprecated using eth0 :1 so what can i use to the VPS ...
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virtualbox networking - difference between 10.0.2.2 and 10.0.2.15

I setting up a vm-based appliance on VirtualBox (using Chef) and, while I have figured out my networking out by trial and error, I'd like to understand better what's going on. Basically, I have 3 ...
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1answer
26 views

debian networking does not restart properly

I have a Debian 8 machine, where I've configured two VLAN interfaces in /etc/network/interfaces. Now I've deconfigured it (deleted information from interfaces file), restarted networking, and now it ...
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2answers
28 views

How do I resolve hostnames on the local network in Linux Mint?

Nothing on Google, other questions on the stack websites or anywhere else seems to answer my question. Let's pretend that my Windows laptop is using the device name mylaptop. Other Windows' devices ...
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20 views

New virtual interface for second set of DNS servers

I want to create a new virtual network interface within Windows that uses the same gateway as the physical adapter, but with different DNS servers (for a DNS proxy service) and use this as a priority ...
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1answer
16 views

Traffic from within Docker containers routing incorrectly— traffic from Docker host routes correctly

I'm seeing a weird problem where traffic originating from within a Docker container located on a VM in the Google Cloud in europe-west1 and destined for a UK company based in Amazon's Cloudfront is ...
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4answers
24 views

Expand wlan with a wlan router or access point

My wish is to expand the WLAN network, because of aborted connections. That means, the "central" router gives the internet connection in the LAN and the other router/access point uses the LAN ...
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1answer
44 views

“Ipcalc -n ipv6_addr” command is giving error

I am trying to calculate network address of Ip address by using Ipcalc command. when i am using ipcalc -n ipv4 address,then it is running fine and give the network address for the IPv4. But when i ...
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21 views

cisco asa public server nat issue

I have been tasked with some ASA configuration coming in a few weeks, and to test out some configuration options I have setup a web server on my local network which I would like to be able to access ...
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0answers
29 views

How many IP addresses can a single network interface have? [on hold]

The title says it all. Looking for the maximum number of different IP's. Having some trouble finding information on this topic. Can anyone help or point me in the right direction?
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1answer
26 views

CentOS 7 statically configured network adapter keeps getting DHCP address

This is driving me nuts. I have a CentOS 7 system. It is acting as DHCP for the network it is attached to, is running Cobbler and PXE, but it is not the gateway. It is the primary file server for ...
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1answer
22 views

Xen Server interference on ARP requests

I have a strange behaviour on my network as my unix-like hosts seem to have problems to reach the gateway. Digging into the network traffic via tcpdump, I've seen that two different hosts answer to ...
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0answers
6 views

VirtualBox won't forward port 80 [migrated]

Windows 8.1x64 host, Debian 8.3 guest. I've got 2 network adapters set up: 1st is NAT and 2nd is Host-only. I have set up port forwarding for ports 22 and 80 for NAT adapter. Port 22 works (meaning I ...
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13 views

Windows Server 2012 Printer Management

I want to add a shared printer connected to a host IP (192.168.0.10,windows 7) , to a server (192.168.0.200,windows server 2012). When adding a printer using the Printer Management just the IP ...
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1answer
28 views

Proving packets per second bottleneck?

I have a '100Mb' network connection that's currently consistently transmitting at about 20K packets/sec, irrespective of packet size in the range of 300-600 bytes. This yields an observed bandwidth ...
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0answers
23 views

cannot reach gateway from unix-like devices [on hold]

I have a odd issue on my network and I cannot understand it. My Windows hosts have no problem to browse the internet while my unix-like device cannot reach the gateway at all. The issue affects a ...
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0answers
36 views

How to connect to a service on a local network machine whch which only listens to localhost?

I have a service which only listens to localhost on port 7400. There is a service running on a windows and an ubuntu machine on a private network. How can another computer on the same network ...
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0answers
12 views

Network issue with VMs mixing dedicated public IP and port forwarding

I already have a virtual machine with its own public ip address and I would like to set up a new VM using port forwarding from the host. I have two public addresses: X.X.X.146 for the host Y.Y.Y.99 ...
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0answers
22 views

Traceroute output - Asterisks

i m pretty new using this command. I run dualboot Linux / Windows on a pc, and i ve noticed the same output whether i m using traceroute on linux or tracert on windows. Can someone explain this to me, ...
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1answer
40 views

Simulate massive network traffic [on hold]

We want to stress test our pfsense box with a massive amount of connections and traffic. Right now we are using iperf, but reaching a number of more than ~300 parallel connections the test clients ...
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1answer
44 views

Ip addressing for serial routing

I have the following packet tracer diagram: I have range of ip address : 10.0.0.0 - 10.0.255.255 I need to assign ip addresses from this range to the routers' serial interfaces as well as subnet ...
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1answer
35 views

How calculate printer average-toner-coverage used per page using SNMP

I want to know the rage toner used per page, for example: for one page print was used x toner for other page print was uses 2X toner I suppose are some SNMP mibs/oids to do this; some idea ?
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3answers
79 views

IP forwarding on Linux

I have three machines Source Machine Destination Machine - IP 10.20.30.40 Intermediate Machine - Host server1.test.com Source machine has SSH access to Intermediate machine and Intermediate machine ...
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1answer
29 views

One way network bridge

I have two networks, with a single machine sitting on both (two NICs) shown below. That machine is Linux. I was hoping to set up a bridge of some sort so that work stations on the 192.168.1.x ...
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9 views

Configuration snort IDS

I have installed snort on my windows 7 machine. But during configuration of snort, it gives me the following error. ERROR: c:\Snort\etc\c:\Snort\rules\app-detect.rules(0> Unable to open rules ...
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0answers
34 views

How to determine optimal fiber cable length?

We are going to send several servers for colo in a datacenter where we got 20U space (half a cabinet). Our configuration includes 1x4U, 1x2U and 1x1U servers and 1U for a switch. They'll all be ...
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1answer
32 views

How to share two ISP in two router configuration?

I have two router configured in lab. To configure network redundancy, I want to configure one ISP on each router. So if network on one router goes down, we will have the network connectivity from ...
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2answers
132 views
+100

Route all network traffic through an openvpn connection and also accepting incoming requests on the hosts' real IP-address

I am searching for a solution to route all traffic from a server through OpenVPN but keep it possible to host applications on the server which can be accessed outside of the local area network. To ...
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0answers
17 views

Changing the subnet of docker0 in Fedora Core 23 [on hold]

I'm setting myself up a new docker host and I wanted to configure the subnet / ip-range used for docker0. Unfortunately, it doesn't seem to be as simple as just changing the parameters in ...
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47 views

Running Apache2 in xenserver

I am trying to run my own squirrelmail email server. This involves the use of apache2, postfix, and squirrelmail. When I first boot up the server everything will work fine, but after about 1 - 2 ...
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13 views

DNS forwarder to ingest client-subnet as EDNS option in outgoing query

I am looking for DNS forwarder able to apply following logic to forwarded queries: - If EDNS client-subnet option present in query from client, preserve it - Otherwise, calculate client-subnet from ...
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18 views

I'm having random nfs slow downs on my nfsv4 gigabit network which cause videos to slow down then speed up

I've noticed this issue happen in two different video players so I'm pretty sure it's a network problem. I'm running Ubuntu with the kernel 4.2.0-35-generic. Here is the result of my nfsstat -4 -s ...
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17 views

Issue with nfsen in fetching sflow data from Linux host

I have two VMs. The first VM is at AWS EC2 instance (red hat). I am using this system as sflow agent. I have installed hsflowd in this machine. My hsflowd.conf file looks like following: DNSSD = ...
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23 views

How to use SNMP to read all the 802.11 probe request messages on an accesspoint [closed]

each Wi-fi clients send probe request to all access points around. I want to programmatically read all 802.11 probe request messages on each an access point in our building. How to use SNMP from any ...
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0answers
15 views

Network connections on aws ec2 in poll_s

Our long running mail server on aws ec2 suddenly faced network related bottlenecks today. The pop service was running at its limit, still end users complained of connection errors and duplicate mail. ...
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34 views

Forward port 80 to 8080 for a specific IP on the network

I have a specific PC on my network running a web service on port 8080. I also have a different machine which acts as a gateway/router, which I configure using iptables rules. What I want to do is ...
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1answer
35 views

Figuring out the most efficient use of an ip range

I am working with Packet Tracer atm and have 3 subnet plans : assigned(management(104users) staff(43 users) admin(35 users)). I have an ip address range of:38.191.0.0 and subnet mask of ...
2
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1answer
57 views

Routed bridge networking for KVM guests along with eth1 alias interfaces for shared hosting with dedicated IPs for each virtualhost

First question here on serverfault, so kind of a newbie, all feedback is welcome. I have a dedicated server running Debian GNU/Linux 8.4 (jessie) with one public IP and multiple additional public IPs ...
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1answer
45 views

fast ping response, latency on traceroute

I have a very strange problem. In short pings to my wireless AP are low (around 1ms), however, once I do a traceroute, the latency to the AP (1st hop) suddenly jumps to ~1000ms. Any ideas what may be ...
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2answers
92 views

How to calculator IP range and subnets? [on hold]

I am trying to find exact formula for finding the IP ranges for the below sample input 10.144.26.192/28 I am getting different IP count in different portals. I used the below online IP range ...
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2answers
146 views

Why is fragmentation done on layer 3 (Network layer)? [on hold]

Why is fragmentation done on network layer and why not on other layers ? Fragmentation means splitting the packet into to small pieces and sent from source to destination. The maximum MTU size is ...
-1
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1answer
19 views

routing laptop to give raspberry pi internet access [closed]

I connected my raspberry pi to my laptop (Windows 10) through direct ethernet connection. Pi is 192.168.1.250 and laptop ethernet is set to 192.168.1.180. I will have internet connection through wifi ...
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7 views

Vagrant Public Network, IP, Using .dev [migrated]

My end goal is this: Create a public networked Vagrant box with Computer1 that is accessible via LAN/Wi-Fi with a local domain like example.dev. First off, I have read this question on Vagrant Public ...
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1answer
41 views

ISP “hide” packet trace route

Yesterday , i've discovered changes in my network , our ISP hides trace route . ie : traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets 1 192.168.88.1 (192.168.55.1) 0.256 ms 0.251 ...
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1answer
29 views

Same script, same OS, same installation, failing

So I'm working with RANCID to monitor some switches and I'm using clogin now to test some modifications. I'm working in two different computers but both of them from the office. Althought they are ...
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0answers
16 views

Will this setup cause a Bottleneck Connection / Speed issues? [migrated]

I'll have one cat6 cable running from my router to a switch. That switch will then give internet and network access to 5+ devices. Will this cause a bottleneck / anything negative if all devices are ...
-1
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0answers
15 views

Cannot connect to network from inside Virtualbox (Windows Host, Gentoo Guest) [closed]

I recently got my computer upgraded from windows 8 to 10, and since then, I've been having trouble getting the internet to work. I was hoping that someone could give me some advice on how to debug ...