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

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Automatically save documents from a scanner to a network folder

I am needing to hook up a Cannon DR225 scanner to the network at the office. We will have 3 users that are terrified of technology so I would like it if I could set up the scanner to automatically ...
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61 views

Installing phpmyadmin on rhel 7 server?

I hope someone here can help me out because I called Redhat support and all I got were links to docs that don't apply to RHEL 7 or are irrelevant. Searching Google I issued following command to add ...
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2answers
81 views

Using Router with DHCP and NAT and Windows Server 2012 as DNS

I have a network currently set up as per the image below. We use Regus's shared Internet and I've create a sub network for our office by using DHCP and NAT on the airport extreme router. Now the ...
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31 views

Adding nic to virtual machine via kvm not showing up inside machine

I'm trying to add a new nic (eth1) to a virtual machine that I have set up using virt-manager. I can use Virt-manager to add the hardware but when the machine is booted no new cards show up. What have ...
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0answers
16 views

Trunking between dell 6248p and extreme summitX440 switch

Hi Guys I'm a little bit confused and I can't seem to find what's wrong with my configuration. When I use switchport mode access on both sides, I can get connectivity. After confirming that, I need to ...
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45 views

two different ping results to the same machine, what does this mean?

I am trying to track down a network or possibly server issue, and I opened a ping to the server from my machine. I will generally receive a <1ms response for a period of time, say 10+ minutes. ...
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2answers
61 views

Wrong IP address registering in DNS

I've just taken over a small business network with 2 Windows servers. SRV2 (Server 2008 R2) is primarily a data backup for SRV1 (Server 2003); they're both DNS servers as well. Our primary LAN ...
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2answers
55 views

How to connect two building 5km apart from eachother?

I have to design a network and give an estimate of the cost of all the equipment. Now I have 3 building 100m apart which I'll connect with Fiber without a problem. Two of those though are connected ...
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88 views

VLAN setup Cisco SG300 and SIP gateway

Hopefully someone can shed some light here. I'm quite new to networking and not too sure if I'm doing the right thing here. We are setting up a new VOIP phone system with SIP gateway for our company. ...
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24 views

Networking issue in IBM x3650 after install Ubuntu 14.04

I have a problem making TCP connections after a fresh Ubuntu 14.04 installation. First of all, after booting the interface is always off. In my case the interface is manually configured and named em2. ...
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485 views

Need advice on Juniper OSPF networking

I have been thrown in to this project because of a coworker's termination. I have a set of Juniper SRX 550 Routers. I need to create an OSPF network that passes all traffic (All subnets) as if it ...
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34 views

Using ifconfig and ip commands simultaneously [duplicate]

Let's say I have interface eth0. I can obtain information about assigned IP addresses and network mask by ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:18:51:6A:EE:21 inet ...
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30 views

subnetting of 16.0.0.0 into 2000 subnets [duplicate]

I got this question and the teacher rejected my answer but didn't tell me why. Question: An organisation is granted the block 16.0.0.0. The admin wants to create 2000 subnets. A. Find subnet mask ...
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52 views

Randomly lose the connection to router

I have been suffering with in this problem for a really long time and I'm running out of ideas. We have VMWare (Intel model server, Intel storage - Windows storage op. system, ). In the virtual ...
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0answers
54 views

Creating router between two subnets

I have created router between two subnets and installed centos on router. Below are the configuration in my router : eth0 : public ip (x.x.x.x) eth1 : internal network gateway1 (150.15.1.1) eth2 : ...
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44 views

Cisco 887 VAW Router - SSID and Password need to change

Could any one help me resolve my Cisco coding issue.I have 887VAW router with coding below. The ISP has delivered pre-configured Router , it is showing network ssid=aamalnet and password=aamalnet. I ...
10
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1answer
215 views

Under what circumstances is TCP-over-TCP performing significantly worse than TCP alone (2014)?

Many admins keep perpetuating - on ServerFault and elsewhere - how bad of an idea TCP-over-TCP is, e.g. in VPNs. That even the slightest packet loss will make one suffer from at least severe ...
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1answer
74 views

Slow Upload Speed - CentOS 6

I've been having an issue with my servers upload speed slowing down for the last week. When it first occurred restarting the network service would resolve the slow speeds. The speed would then be okay ...
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1answer
30 views

Cannot view folders on client with VPN to 2008 server

Recently installed server 2008 as part of our upgrade from 2003 and managed to resolve most problems but left with the last one which is that I cannot view folders or files on 2008 server from client ...
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1answer
26 views

Firewall Rule One way smb in two network

Im trying to make an one way smb firewall rule in a MikroTik firewall rule The thing is I have two network one on 192.168.1.0/24 and one 192.168.3.0/24 192.168.3.0 is the network that should be able ...
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5answers
78 views

What software can I use to create a private network between Windows Server 2012 boxes regardless of physical location?

I have several Windows Server 2012 dedicated servers with static ip addresses. I am wondering if it's possible to create a secure private network for these machines using software only. The machines ...
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28 views

Extending fiber length (GPON)

How to extend the fiber length for a standard consumer-grade GPON terminal without buying special equipment? As I would think these so called GPON terminals use the cheapest multimode fiber. Are ...
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1answer
23 views

Linux IP Alias of different pool becomes primary

I have two different Public IP addresses of two different subnets : 1) 206.190.147.100 2) 198.105.208.3 I am using CentOS 6.5 and my configs are as follows : root> cat ...
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27 views

amazon ec2 ftp RETR hangs

The problem is with an Amazon ec2 instance "Red Hat Enterprise Linux Server 7.0 (Maipo)" (kernel 3.10.0-123.6.3.el7.x86_64) When attempting to RETR a remote file the FTP client hangs indefinitely. I ...
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25 views

Point to point connection not using full bandwith

Here's my network: [A]<------20 Mbit point to point ---------->[B]<-------20 Mbit point to point-------------->[C] At [A] there's a switch, at [C] there's another switch, while at [B] there's ...
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1answer
33 views

QEMU guest can access HTTPS sites, but not HTTP

So I'm configuring a QEMU guest on my Debian Wheezy server, using virt-manager. As guest I've installed Ubuntu 14.04.1 server. The server contains the following iptables rule: iptables -t nat -A ...
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30 views

Deny access from from/to subnet

We are running a VPC on Amazon. Our main network is 192.168.0.0/16 We have a subnet at 192.168.1.0/24 Two subnets which are entrypoints for our VPNs at 192.168.2.0/24 and 192.168.3.0/24 And more ...
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55 views

Configuring SoftEther on VM with two virtual ethernet card

I am very novice in networking and I just have basic knowledge. I have scenario that I'd like implement. I have a VMWare Windows 7 VM with two network interfaces. One shares the host's network using ...
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12 views

RX_ERR in ifconfig ouput

How can we debug the RX_ERR and find the point of the failure. I can see that number of RX_ERR and RX_DROP are the same . There isn't any TX_ERR and TX_DROP. Even when verified from the switch end I ...
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1answer
34 views

Data only seems to go one way on ethernet over usb connection [closed]

I have a router+modem combo connected via ethernet to a raspberry pi (this part works fine) The pi has a usb wifi device plugged in, and runs hostapd, does NAT and provides internet to a household. ...
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1answer
26 views

how do you query your existing ldap parameters?

ldapsearch -A locked my computer up and upchucked about 3000 unnecessary lines (not one clearly had the information I was looking for). Is their a quick summary search that will upchuck your ou, dn, ...
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1answer
14 views

LDAP config for Novell export

I am trying to export the email userlist from groupwise via the consoleOne export tool.. In the tool, they ask for some basic LDAP parameters that make little sense in the GUI (I dislike GUIs). ...
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33 views

OpenVPN network topology

I'm part of a very small startup and as such I have little money for infrastructure, etc. I need to roll out a OpenVPN service so some employees can VPN in while on-site. To give an indication of ...
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2answers
58 views

Reverse proxy on ALL ports, not just http?

Hello I recently asked a question about running multiple websites on different servers on the same network here multiple servers running the same thing, how? I have researched about setting up a ...
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0answers
18 views

Will an inbound iptables rule in ddwrt on port 443 break https? [migrated]

I want to run a vnc repeater service on my home ddwrt router. Due to the possibility of friends/family asking for support in unknown network environments, I'd like the host-repeater application to run ...
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31 views

NAT with port forwarding on same interface

I have some issues with the port forwarding on same interface. I have server1 with the public IP 5.1.1.1 and one company publish a MySQL database with IP 10.1.1.1 through VPN reached only by server1. ...
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5answers
215 views

Requests take a really long time from certain ISP

We have an Apache server with PHP running on a virtual machine. Document roots are inside the users' home folders (/home/users/{first letter}/{username}/), and /home/users/ is mounted over NFS. It ...
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57 views

Inbound traffic equals outbound traffic

I'm trying to monitor inbound and outbound traffic using Cacti on Ubuntu Server 14.04.1. I've got it up and running, but the reported data is wrong. When I run 'ifconfig' I get the following: lo ...
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1answer
74 views

Proxmox vps container connection problems

I have Proxmox on my node server which have ip:5.189.190.* and I created openvz container on an ip : 213.136.87.* and installed centos 6 on it The problem: Cann't connect to container ssh directly ...
2
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1answer
38 views

Linux Network tuning to prevent tcp rcvpruned and backlogdrop?

My datanodes in my hbase cluster are triggering some tcp rcvpruned and backlog drops from time to time: It seems to be there are at least two angles to approach this at: Tune HBase/HDFS etc... so ...
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3answers
120 views

Too many duplicate IP with same MAC address in output of arp-scan

My company network is very unstable. It takes so much time to ping to gateway about 50ms or higher. I did some troubleshoot to find out the cause. I have to try arp-scan when network is unstable and ...
0
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1answer
62 views

Postfix config for backend webservers behind a load balancer [closed]

I've two web servers (ws1.example.com, ws2.example.com) with postfix installed locally as a mail rely (using mandrillapp), user access them via www.example.com, which is a load balancer On ws1, the ...
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0answers
84 views

TCP packets not reaching app, iptables dropping?

We are occasionally, but not consistently, experiencing a weird network stack issue. Rebooting the server in question clears it up. It happens as follows (gleaned through tcpdump on the server): ...
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2answers
89 views

Send Text String to a Socket In Windows

I have a server that has an open socket that listens for a particular text string on it in order to perform an action. Our linux machines send this data via: echo "text_string" | nc -w 2 ...
0
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1answer
62 views

dummy network interface in Linux

When i create a dummy network interface and then bring it up it show up being in UNKNOWN state: root@5b8dd2855a9c:# ip l a boom type dummy root@5b8dd2855a9c:# ip l show boom 58: boom: ...
2
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1answer
113 views

When cloning a VMware Virtual Machine, how can I prevent MAC address conflicts?

I've run into the following problem on both VMware Fusion (for Macs) and with VMware ESXi/vSphere. Many of you are familiar with the problem, and it is described at VMware KB: "Networking does not ...
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1answer
48 views

How to find out file path of file on a network share drive?

I am using a small .NET application which integrates a file into another application, however, I keep getting the following error in EventViewer (part of the .NET application): "The specified path, ...
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36 views

KVM virtual IP address not working on HOST, works on GUEST

I have a setup composed of the following: -> A HOST running KVM with the following network configs: # The loopback network interface auto lo iface lo inet loopback # The primary network interface ...
13
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2answers
2k views

What are the possible issues in using very short DHCP lease time (< 1min)?

We have a network setup for a demo, which lasts about 15mn. Our DHCP server is configured to assign ~ 100 addresses (max number of simultaneous connections or our AP) ... but since people might come ...
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1answer
43 views

multiple servers running the same thing, how? [closed]

I have a little issue that I don't understand well enough to answer myself. Basically I have some servers on my home network, I am wondering how 2 servers could run something, lets say apache in this ...