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

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How does udp work when links en route have different speeds? [closed]

My understanding of UDP is that it is a best effort protocol. The data is simply sent and may or may not get there. If I am sending data from A to B using UDP over the Internet and the first link ...
-4
votes
1answer
44 views

2 networks on unmanageable switch [closed]

I have 2 ISP's in my office and both are connected in one switch. One is TATA and one is ACT. TATA will release IP's from their server (100.118.11.1 series). I have connected AP's in my switch, so ...
0
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0answers
12 views

Pinging <anything>.google resolves to 127.0.0.53 [duplicate]

Ok, this is weird. I didn't know the Google Aprils joke URL (it's http://com.google FYI), so I put http://google.google into my Chrome browser, and got returned a default IIS landing page. Turns out ...
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4answers
236 views

telnet cannot connect to port without firewall

If I try to connect to MySQL with telnet myhost.com 3306 I get a network not reachable error, even when I flush all iptables rules. I can reach other ports like ssh (with the same iptables rules ...
1
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3answers
70 views

Using a computer with many COM ports as a low cost out of band solution?

I'm trying to come up with a cheapo out of band solution for my cisco routers in our data center. I want to be able to access them directly from the console remotely so if they are not accessible from ...
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0answers
15 views

routings between 2 network card

I have 2 nics on running 2012r2 server. RRAS is configured to provide vpn access through n/w Card1. N/w card 1 is connected to the internet with dhcp ip address. 2nd n/w card connected to internal ...
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0answers
16 views

Brocade 6740T connect to management port

I'm having trouble connecting to the management port of my Brocade 6740T switch. Here's my setup: external network --> dumb switch --> Brocade 6740T --> servers | ...
1
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1answer
25 views

Make VNC available without opening non-ssh ports to the WAN

I have a local network consisting of a gateway router/firewall running dd-wrt, a machine running OS X called mac, and a Debian host named ssh-server. The firewall forwards port 22 to ssh-server. I ...
0
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1answer
43 views

redirect traffic from 127.0.0.1:5003 to external interface

I have an application that exposes Web Services on the loopback address 127.0.0.1:5003 so they are only available to the localhost. Is it possible to redirect traffic from there to the external ...
0
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0answers
31 views

Can ping but not connect to Samba

I have installed Samba on my machine (192.168.178.50) and altered /etc/samba/smb.conf to add a share: [vs] comment = Visual Studio path = /home/mrt/Dokumente/vs/ browseable = yes read only = no ...
0
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1answer
49 views

How to use two different ISP on same LAN with one Ethernet switch?

Sorry if same question is asked on Stackoverflow. I searched and tried some configuration but are not working in my case. I have a LAN with 6 machines which are on same network (each other can be ...
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0answers
3 views

CoreOS on VirtualBox only works with one adapter at a time [migrated]

I'm trying to learn more about CoreOS. (I'm not using Vagrant, just plain-old VirtualBox.) So I created a disk using coreos-install. Unfortunately, I can't find my original cloud-config.yaml file, but ...
0
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0answers
44 views

Draytek Vigor 2860 multiple external IP-addresses

I've bought a DrayTek Vigor 2860 for my company network. And I'd like to use it for two VLANs with separated external IP's. I have 6 LAN ports on my DrayTek. For example: External IP-adres: ...
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2answers
37 views

Is there a way to control Internet usage on LAN? [closed]

I have a network with many client PCs. I have to block Internet access for some of the users and allow it for others. Is there a way that can control Internet access, or filter and allow based on MAC ...
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1answer
53 views

Cannot connect to the Internet, Limited Access(Ethernet), Windows Server 2012

I am using a Windows Server 2012 for my institute, due to connectivity issues I uninstalled the services AD DS, DHCP, DNS. But after the uninstall the server is unable to connect to the Internet, ...
1
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1answer
24 views

Setting up a small network with a redundant WAN setup

Asked on the network stack but referred here, partly because lower grade equipment. Small office and we are trying to piece together a network with our two wans (diff ISPs) a switch and a few ...
0
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0answers
2 views

Network Vicinity View doesn't show agent managed PCs

Network Vicinity View in my SCOM only shows other network devices+management server, but does not show any agent managed computers, why is that? Or is it supposed to be like that and i'm missing ...
1
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0answers
55 views

Can iSCSI and Internet work on same NIC? [closed]

I have a Synology RS815+ that supports iSCSI with 4 GbE ports. I have two Mac Mini's (2014) with built-in GbE and a TB to GbE adapter. All 8 connections are tied to the same switch, with client ...
1
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2answers
27 views

Does Windows Network Load Balancing require any specific ports to be open?

I have two Windows 2012 servers, joined in a Windows Network Load Balancing cluster. I have been trying to find how the NLB heartbeat message is exchanged between those servers (to make sure it will ...
1
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1answer
22 views

Does TCP's MSS hide a mismatched intra-LAN MTU?

I'm trying to understand how mismatched MTUs behave in a network. Suppose two hosts are able to talk to each other through an Ethernet-based network. The network and host A are configured for jumbo ...
3
votes
1answer
67 views

Connect two infiniband cards to each other without a switch

Is it possible to connect two Mellanox ConnectX-2 cards on two seperate computers to each other without a switch in between? I am just trying to learn to use verbs programming without having to spend ...
1
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0answers
27 views

What is the best way to configure an iDRAC/dell server in a public data center such that the idrac doesn't have to be exposed public facing

I have a server right now in a data center behind an OpenVPN using the client on the box to connect to the vpn server. I'm going to install the iDRAC and want to know how to best configure the ...
0
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0answers
38 views

Unknown device showing up in network scan

I need some help finding a device that has been showing up whenever I scan my network using Spiceworks' "Inventory" scan. I can ping the device, but nslookup returns a non-existent domain, and ...
0
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1answer
46 views

PXE or other : deploy images on single board computers (SBC)

We have a few SBCs of various modeles (but a lot of freescale). When received, these SBCs are bare (no BIOS/U-boot). We generate linux embedded images with Yocto (using U-boot as bootloader), and we ...
1
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1answer
53 views

Proxmox: 1 NIC, 1 Public IP, unable to get WAN interface working in VMs

I have a computer running Proxmox, and it has 1 single NIC that is directly connected to internet and has a single public IP. Then, I have different VMs (KVM) running and one of them is pfSense. What ...
0
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1answer
32 views

NFS Server “outbound” bandwidth consumption

I need to understand about something in NFS (Server). Let say i have: Two Different Clouds (One Server on each) One NFS Server One Apache Server (as the NFS Client) with a NFS Mounted Directory ...
1
vote
1answer
46 views

Infiniband cable

What is the difference between an active and a passive cable? What is the difference between QSFP and QSFP+? Given the choice between copper and fiber, for a very short distance like 3 feet max, is ...
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1answer
27 views

configure two routers to one T1

We have a router hooked up to our T1, and the router went down the other day and caused our phones to go down so i had an idea to use a backup router. I know very little about networking. Is it ...
0
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1answer
40 views

PXE boot to ISO file

I have an ISO file for an HP diagnostics boot. Rather than burning a CD for every single computer I want to run diagnostics on, I'm wondering if I could load this file onto a server and allow the ...
0
votes
1answer
8 views

reg query inside unknown keystring

Is there a way to reg query into an unknown keystring? What I mean by this is if I do reg query HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\ the entries will ...
0
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0answers
28 views

Active directory creates network issues

I have an OpenStack virtualization environment, where I created 3 VMs using the same Windows Server 2012R2 image. Each machine is syspreped after initial deployment. My goal was setting up a simple AD ...
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0answers
3 views

How to connect to my web server? [migrated]

I have implemented a simple web server as a solution to a course assignment and I want to connect to this web server over the internet. I've set it up to listen on port 22881 and configured my router ...
0
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1answer
89 views

How can I configure multiple tap interfaces for a single KVM virtual machine

I am trying to setup a VM using Linux KVM for a F5 BIG-IP VE deployment (used in a lab) ...
0
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0answers
30 views

How can you calculate IP address subnet ranges? [duplicate]

If you're given: Number of needed subnets: 2 Network Address: 195.223.50.0 I can answer the following: Address Class: C Default Subnet Mask: 255.255.255.0 Custom Subnet Mask: 255.255.255.192 ...
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0answers
46 views

problems triggering a build in Jenkins with bitbucket-plugin

I installed Jenkins using Turnkey-Linux Jenkins-VM, running in a virtual server environment (Windows host in Virtualbox) with a local private IP address and operating on port 80. The development team ...
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2answers
52 views

Network get very slow at noon everyday [closed]

My network gets very slow every workday starting at noon until around 1 PM. No updates are planed during that time. What could be the possible reasons why this is happening?
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0answers
61 views

Creating a Network Diagram with .pcap [closed]

I have a Wireshark .pcap Capture of around 500k packets and I would like to enumerate a Network Diagram with all the Routers, Switches, PCs etc. Is there a tool that I could use to automatically ...
0
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1answer
31 views

Seperation of network traffic\routes

In a lab environment I have 4 VLANs: VLAN10 -> Management (192.168.10.0/24) VLAN20 -> Service (192.168.20.0/24) VLAN30 -> Administration (192.168.30.0/24) VLAN50 -> Public (192.168.50.0/24) ...
2
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1answer
43 views

why do all softphones fail to authenticate after receiving 401 unauthorized from Asterisk?

When I attempt to connect to the Asterisk server from CSipSimple, over a Cisco router, on the same network, Asterisk logs show the attempted connection: <-------------> [Mar 23 20:01:34] ...
1
vote
1answer
36 views

Route programming to allow a separate subnet on a 2nd NIC to connect through the 1st NIC's internet connection [closed]

Good morning folks, Networking is not my strong suit, and after reading up on route programming and IP routing, I am now thoroughly confused and in need of guidance. I have a Windows 7 Pro machine ...
3
votes
1answer
49 views

Procurve script/automation

This may be a stupid question, but I'm normally not a network admin, but circumstances have me there. I'm trying to disable down ports on a switch, but have a boatload of them, I'd like to configure ...
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0answers
31 views

configuring two T1's

We have two NetVanta 3200's. One is plenty for us, but the other is just a replacement kept in a box. Recently it started having some problems and it caused our phone servers to go down for about 20 ...
6
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1answer
341 views

Are CSU/DSUs still used for modern equipment?

My understanding is that CSU/DSUs are no longer used anymore for modern equipment because cable connections like Ethernet come with fixed bit rates. Is this true? Do correct me if I'm wrong.
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1answer
46 views

Proper network cabling tips [closed]

Sorry if this is not the correct site. I am really not very knowledgeable on network cable installing (so sorry if I say something very stupid here), but we are moving to a new office and want to do ...
0
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2answers
64 views

Windows Server 2008 - Local Area Connection disappeared from ip interfaces

I have a Windows Server 2008 R2 machine. Local Area Connection isn't working anymore, the interface exists but it doesn't as an ip interface. C:\Windows\system32>netsh int show int Admin State ...
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0answers
24 views

What are the network prerequisites for Windows Azure Pack

I have followed many articles to install and config windows azure pack distributed, But every time I finish configuring everything, the azure pack is not working and give me different errors, seams to ...
1
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2answers
105 views

Client computer(Windows 8.1 Pro) unable to connect to a domain(Windows Server 2012)

I am unable to connect a client pc to a domain controller which is a Windows Server 2012 Datacenter. I have tried connecting it : Through the system menu in Control Panel Putting all the ...
0
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0answers
22 views

Route 2 external IP ranges using pfSense

I have pfSense running on some hardware routing my /27 block of IP addresses assigned by my ISP. I asked for and got another /26 block that I want to send all of the block to a single server (it will ...
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2answers
35 views

Is there a way to block ALL inbound/outbound traffic going outside of a LAN with iptables?

As the title says, I'm just looking for a way to disallow any traffic on ANY port unless it's going to a local IP address (192.168.1.*).
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0answers
35 views

HP ProCurve 4208vl - Show PSU information?

I'm working with a few older HP ProCurve 4200-series chassis switches (4204vl and 4208vl). Some of these units have single power supplies, while others have dual power supplies. I'm trying to ...