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

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Can DNS fail because of a client server configuration?

I recently began work in a new environment. The network has many subnets and many nodes with many network engineers who work in the environment. There is a Linux server with Cobbler on it. It has a ...
2
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13 views

Does Fast Retransmit and Retransmission Timer work at the same time?

When Fast Retransmit is implemented, if I received packet 1, then I will send an ACK that says I need packet 2, and then if I received packet 3, I will send a duplicate ACK that says that I need ...
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1answer
29 views

Different network speeds from servers on same subnet

I have a pretty strange issue, I'm looking for advice on how I can debug it. I have two servers (A) and (B) on the same subnet and switch. Server A->B transfers at a full 12MB/s and vice-versa. ...
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21 views

MIKROTIK - Two LANs connected with switch

I have a very simple network. I have two LAN networks (192.168.2.0/24 and 192.168.3.0/24) connected via a router at each site and the routers are connected via a switch. ...
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15 views

Can /etc/inittab errors prevent network startup?

I have a small php server running on Raspbian via /etc/inittab: push:235:respawn:/home/pi/volkszaehler.org/misc/tools/push-server.php Due to configuration issues my php script was removed and- in ...
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11 views

Where to store R packages in a centos 6 network cluster

We have a small cluster of linux machines (~15) with up to 20 users. Over the last few years we have written a few basic R scripts for doing basic statistical analysis. The problem I have had as a ...
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32 views

Why is giga bit network fast than disk? [on hold]

Why is fast giga bit network than disk? According to below URL for slide of Dr Jeff Dean, giga bit network is fast than disk. ...
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15 views

Policy based routing on centos [duplicate]

I am trying trying to implement policy based routing on a centos 7 server using these directions - . The routing works fine until I reboot then the policy routing rules disappear. If I enter them ...
2
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1answer
1k views

Second ENI in AWS VPC is not accessible on Ubuntu instance

I'm just getting into VPC, trying to understand how everything works. So far the biggest hurdle I've run into is that any time I add a second Elastic NIC to a machine, that second IP is not accessible ...
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3answers
3k views

How do I find Windows Server Domain Name workstation belongs to by IP address in local network?

Company workstations belong to several domains and I have to find out exact Workstation domain by workstation IP. Is it possible from command line or do I have to call an administrator ? Thank you ...
0
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1answer
25 views

Captive portal detection by Apple Oses, iOS 'splash CNA popup' does not show?

I built a captive portal (Linux Debian router), providing a WifiHotspot based on hostapd and iptables rules ( like this: ...
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4 views

RADIUS for unique hotspot and iOS clients?

Sorry if stupid questions. I need to be certain. Is Radius needed for a hotspot captive portal, where no login is needed, and which is unique (one only router) ? Is Radiys involved in another thing ...
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4answers
3k views

Need help troubleshooting intermittant TCP timeout in HAProxy

I have an application where the client connects to a server via a simple TCP based protocol over TLS/SSL. In development, this has worked great for many months while we were building our application ...
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0answers
8 views

VirtualBox networking (inception computing) [on hold]

I am new to world of networking and now I am trying to connect 3 PC`s together. I have windows 7 host that runs Ubuntu64-bit server guest, that runs ubuntu32 server guest. Win7- Host Only network ...
0
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2answers
16 views

Using IIS to give domain name to external site

At my workplace we are currently hosting our own website on a windows server using IIS. We've now had a new public website created by our marketer using SquareSpace and we want to be able to point our ...
15
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3answers
3k views

How do I ground a network switch?

I read in a lot of places that it's necessary to ground networking equipment. In a small SOHO environment where there are, say, 4-5 systems and each system is grounded, is it also necessary to ground ...
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0answers
13 views

Can't access from outside process running in a Docker container

I'm trying to run a gameserver inside a docker container on my server but I'm having troubles connecting to it. I created my container and started my gameserver (which is using port 7777) inside it. ...
2
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1answer
43 views

Securing Windows Server 2012 from the internet

I've placed my direct internet connection into the public profile for the firewall and started disabling every rule to block all but RDP. The only rules I am not sure about are these Core Networking ...
0
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1answer
25 views

What can I do to improve a business-oriented network that only has access to 3 6Mb/1.5Mb lines with 15-30 clients? [duplicate]

I work at an e-commerce based business in a 16k warehouse. The only available ISP solution is AT&T, with each 6Mb/1.5Mb line costing $50 and fiber optic being an option for $800/mo at 20Mb/20Mb. ...
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0answers
11 views

DNAT not forwarding to correct (local) IP address

I'm trying to port-forward a HTTPS service which uses different SSL certificates for each of the several IP addresses on the machine. Web server listens on each IP address on the internal port (444) ...
1
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1answer
38 views

What can I do to improve a business-oriented network that only has access to 3 6Mb/1.5Mb lines with 15-30 clients?

I work at an e-commerce based business in a 16k warehouse. The only available ISP solution is AT&T, with each 6Mb/1.5Mb line costing $50 and fiber optic being an option for $800/mo at 20Mb/20Mb. ...
0
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0answers
5 views

NIS client is not able to change password using yppasswd in OpenSuse 13.2?

NIS Server - OpenSuse 12.1 NIS Clients - OpenSuse 13.2 At NIS Client: nisuser@opensuse13.2:~> yppasswd yppasswd is deprecated, use /usr/bin/passwd instead Changing password for nisuser. Old ...
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0answers
12 views

windows server 2012 disable automatic lockscreen/logout after end session

I'd like to disable disable automatic lockscreen/logout after end session. I need this because autoit scripts being automaticly stopped as I close remote desktop.
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0answers
12 views

AWS + KeepAliveD: Not able to Ping or Telnet Virtual IP from remote hosts

I am setting up KeepaliveD with 2 nodes on AWS by following this article. My Virtual IP gets moved from one node to another in case of fail-over. However, the VIP just cannot be accessed from a remote ...
0
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1answer
3k views

How do I connect two Cisco Catalyst 2950 over LAN?

I'm trying to connect (2) Cisco Catalyst 2950's over each's respective FastEthernet 0/1 ports, but for some reason, they're not communicating. I'm doing this to physically extend my network and add ...
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2answers
72 views

IP on different subnet mask [on hold]

I'm still learning the ropes of Windows Server (specifically 2012R2). My assigned task is to setup a static local IP address, I managed to get it set to 192.168.1.96 (with subnet mask 255.255.255.0) ...
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1answer
18 views

KVM fastest network between 2 guests

I wonder if there is any way to speed up the network communication between 2 KVM guests on the same physical machine. Would that help at all if I would configure a separate bridge network for just ...
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1answer
29 views

How to use lan ip on outside server [on hold]

I have a D-Link Router with Static Ip Address. That ip is located in sri lanka. Now i have a vps in usa. But i want to use that sri lanka ip on my vps as main server ip. It is possible? If possible ...
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1answer
37 views

Hostname is not mapped to the ip address correctly [on hold]

I recently installed Wordpress on my home server running Arch Linux. Everything else works smoothly except that when try to access the server externally, the style sheet is not rendered. I have read ...
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0answers
16 views

Can't access host-only network when on two interfaces [migrated]

I'm trying to use a host-only connection with my VirtualBox VM. My VM is set up and can ping the host (192.168.56.1) on vboxnet0. If I disconnect the host from my local network (internet access) I ...
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47 views

Millions of TCP FIN-ACK retransmissions from Google blocking traffic on my desktop machine

In a few minutes I have received about 7 millions(!) FIN-ACK packets from IP address that belongs to Google 74.125.133.188 what totally blocked network traffic on my desktop(!) machine. Other ...
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1answer
28 views

How to extend the VLAN defined in the Ethernet network into the WiFi network? [on hold]

How to extend the VLAN that you have defined in the Ethernet network into the WiFi network?
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3answers
2k views

Cannot ping from a bridged inteface

I am trying to bridge between eth2 and br0 from Ubuntu 11.04 within virtual box. There is network bridging to host physical machine. From the guest OS after bridging I can ping from br0 but ...
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8 views

ip command vs qdisc discrepancy in dropped packets

I am simulating packet loss via mininet network on Ubuntu 14.04. Why are there no dropped packets showing up in ip command? For switch s3, I have Qdisc (sudo tc -s qdisc show): qdisc htb 5: dev ...
0
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1answer
23 views

RTNETLINK answers: Invalid argument while specifying packet loss by tc command

I am trying to specify packet loss by tc command on interface (port) 1 of switch part of network I have created using mininet : sudo tc qdisc change dev s1-eth1 root netem loss 0.1% but gettring ...
4
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2answers
178 views

Interconnecting options for server rack and network rack?

This is my first post on Stack Exchange after years of roaming around. I'm having difficulty deciding on a rack setup that meets our company's needs for scalability, management, and future proofing. ...
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16 views

Proxying request from nginx docker container to tomcat docker container (all inside Vagrant VM)

Running a Vagrant (virtualbox) VM with two docker containers inside, nginx and tomcat. Want to host static files in nginx container and proxy web requests to the tomcat container. I've read up on ...
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Broadcomm 53393 ethernet switch [on hold]

Anyone worked on this before ? Tried to work with very limited documentation. Need someone who has past experience or can point me to a reference source.
2
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1answer
3k views

How do I view cached PMTU under Linux (and all other OSs)

When I ping a remote site with the DF bit set and a packet size that is too big for my router the first ICMP "fragmentation required" message is sent from the router. After that the message comes from ...
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31 views

changing IP for specific host DNS entry in BIND for dedicated server [duplicate]

changing IP for specific host DNS example (test.com) entry in BIND to point to different IP let say my 2nd dedicated server IP. I have dedicated server hosting on data centre running BIND9, connected ...
0
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0answers
22 views

Solaris 5.10 telnet connection closed by foreign host

I try to connect to a Solaris 5.10 server using telnet, but I only see: $ telnet xxx.xxx.xxx.xxx Trying xxx.xxx.xxx.xxx... Connected to xxx.xxx.xxx.xxx. Escape character is '^]'. Connection closed by ...
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1answer
80 views

Migrating from a Class A network to a Class C network [closed]

In broad terms, how can one safely to transition from a Class A (10.x.x.x) to Class C network? We have a gateway for the internet, and a separate local DNS and DHCP server, in this setup.
0
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1answer
32 views

Azure Load Balancer, Internal Network Limits

The Issue: Cannot create sufficient socket connections to VMs, going from Azure VM -> Azure VM. There have been a few questions about Azure Load Balancer, perhaps because there is currently little ...
1
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1answer
98 views

Receive many UDP packets & ksoftirqd load

I want my server to be able to handle more than 1Mpps from a 10g card. Is it possible? I have Ubuntu 14.04 with kernel 3.11 and a 16 core Xeon machine. It seems that ksoftirqd becomes bottleneck in ...
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0answers
28 views

BGP routing table [on hold]

I'm currently trying to understand how BGP works. Unfortunately, I'm running on an OSX system and tried to install some BGP simulation, i.e. Core, Imunes, psimulator2, c-bgp, for hours without ...
0
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2answers
9 views

How do I monitor network usage on a Windows server?

I would like to monitor server bandwidth usage. The server OS is Windows Server 2012 This should give me as result the amount of data over a certain period of time and separate it by protocol and by ...
0
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1answer
9 views

Connection from application on network share fails

EDIT: I tested some more...If I copy nslookup from the Windows directory to my mapped network drive, it cant' resolve hostnames: H:\nslookup dbserver (null) UnKnown Address: 192.168.0.195 If I ...
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2answers
2k views

Juniper SSG5 DHCP IP Pool is full. Unable to offer IP address to client

hope we have some Juniper guys around, I have configured a Juniper SSG5 as our main firewall/router the DHCP server set on interface bgroup1 to have a rang from 10.10.10.76 to 10.10.10.210 All ...
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0answers
11 views

how can you use routers as a repeater [closed]

hi i am new to networking i am moving to new house in a few months and i need to know if i can use a router as repeater without custom firmware. if it helps will be using this moderm/moderm router ...
0
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1answer
62 views

Ping response time suddenly rose up to average 1500ms or more

At normal situation the ping (8.8.8.8) response time is 50ms. But out of sudden it just peaked to 1500ms average or more and quite frequent recently. My server is CentOS 6.6 with eth0 (192.168.1.1) ...