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

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Cannot connect to sql server by IP Address but using the hostname works

After upgrading to the newest version of windows (windows 10 build 10586) I am no longer able to connect to a remote sql server by ip address. Here is the error I see: [SqlException (0x80131904): ...
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51 views

Route 172.0.0.0 and 10.0.0.0 traffic through two NAT boxes

I have set up two NAT boxes in two separate AWS accounts and given the necessary security group permissions to allow both instances to talk to each other. In account A I have a service that needs to ...
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69 views

Adding multiple vlan interfaces into bridge (ovs)

I am adding multiple vlan interfaces (eth3.409, eth3.410, ...) to a bridge, furthermore I also add the eth2 interface (local network) to the bridge. eth3 is a trunk with 13 different vlans. The ...
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64 views

Maximum transfer rate iSCSI bonding vs multipath

I want to get the maximum tranfer rate with iSCSI from my virtual machine (Linux) to my Linux Storage Host. I don't know iSCSi well so I'm not sure which way is the best for performance. A: Just ...
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48 views

netctl profile ignored on reboot of Arch Linux VirtualBox VM

I setup a netctl profile for a network device enp0s8. The profile gives a static IP address to the interface. If I turn down the existing profile for the device (automatically setup at boot) and start ...
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63 views

Windows server can't connect to other servers over VPN

We have 10+ VPS's running Windows Server (mostly 2012R2). All these servers have both a public and private network interface, with the private network including a pfsense VPS that builds a VPN ...
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59 views

Interpreting TCP Traceroute results here?

I used to be able to connect via SFTP to a remote server to download files. Our local server is Windows 2008 Enterprise and the remote server is Unix. The local computer and the remote server are ...
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11 views

Network planning for distributed programming model

We are planning our next generation system, our system is a SaaS application with high multi-tenant needs. Currently we support 4 customers but we expect to have more with our new system. In our ...
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55 views

Radvd sending advertisement to the wrong interface

I have the following radvd.conf file: interface eth0 { AdvSendAdvert on; MinRtrAdvInterval 30; MaxRtrAdvInterval 100; route 2000:e000:0:2::/64 { ...
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40 views

Curl hangs over 2599 bytes response for specific host, where could I investigate?

I have one server that curls other servers for somepage.php, is does it with over 8 servers now, but the curl doesn't work on only one of them, it simply hangs. Investigating it further, I noticed ...
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68 views

Is firewalld blocking return traffic?

I'm on Debian 7 trying to forward requests to other machines through firewalld and have the following setup: --HOSTNAME-- ----IP----- ------------Configuration------------- Firewall 192.168.0.2 ...
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73 views

Connecting 2 single switches to a stack

I have a core switch made with 2 stacked Cisco SG500XG-8F8T switches. Now I have to connect 2 3Com Baseline Switch 2920-SFP Plus to extend my gigabit network, but they are not stacked. So I connected ...
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216 views

Samba connection fails from OS X

The server is running Ubuntu 12.04 and Samba 3.6.3. Windows users can mount their shares without problems, using the path \\my_server.com\username and account \username. However, when I try to ...
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33 views

Issue in Wireless network

I am facing weird issue in Wireless network, explained in details below: I am using Motomesh Duo 4300 radios Total 7 no. of AP in the field Outdoor network Area around 3*3Km 1 no.of IAP(connected ...
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140 views

Is it secure to use sshfs in conjunction with OwnCloud?

I currently have an account with a Virtual Private Server (VPS) company - https://www.ovh.com/us/. On the virtual server I've rented from them I am running Debian Linux with OwnCloud and Apache ...
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349 views

Didn't receive any response from local server in the machine

So I've server linux using NGIX with docker and many Applications django with UWSGI. So I need to create a job to execute inside a container of docker. This jobs will do a request to a some url of ...
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45 views

Packet capture on ESXi host

I have an issue I am trying to track down and I believe the problem is with physical networking hardware. I have read the VMWare documentation on the pktcap-uw command and I know I can use it to dump ...
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39 views

Local Network not working on one server while the other one works fine

So I have two servers (davros - working, kraken - not working) on the same subnet (10.10.28.0/24). They both have the same configurations and yet only one of them works. (Also, I should note that ...
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107 views

How do I deploy Docker Swarm securely, without hard-coding everything?

I would like to set up Docker Swarm over a public network, and I would like to minimize the amount of reconfiguration that has to happen when workers' IP addresses change. The recommended setup ...
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105 views

LAG Managed to Unmanaged switch

I currently have a brand new 24 port unmanaged switch. Also I just got some quad Intel NICs for a few of my servers. Therefore I am going to buy a 24 port managed switch, to setup link aggregation ...
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43 views

Server 2008 R2 permissions not working

First of all: i posted this yesterday but put in the wrong email so I can't access it again. I am configuring a 2008 R2 server for learning experience. The problem I'm having is the following: ...
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161 views

docker0 boot2docker network changing between restarts

I'm experiencing an issue where after restarting my boot2docker VM the docker0 network segment changes between 172.17.0.0/16 to 172.18.0.0/16 That is a problem since I have a DNS container running ...
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27 views

WAN bonding to a VPN server

We have some network issues with our ISP's and almost always have one WAN link down/repairing. We currently use WAN Failover, however this cuts out our SIP calls midway. I want to join three ...
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75 views

2 IP cameras with same configuration but different behaviour

I have a Vodafone Station router, and 2 IP cameras connected to it through an Ethernet cable. Both have the same configuration. Both DHCP enabled, one has IP 192.168.1.10 with port 81 and the other ...
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399 views

Are the i40e and ixgbe drivers really used by our Intel NICs?

We recently got two QCT 2U4Node high-density servers. Each node is equipped with a XL710 dual 40G NIC with two QSPF+ ports and two QCT mezz cards that sport Intel 82599 and dual 10G SPF+ ports for a ...
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441 views

DRBD server not starting - error in creating netlink socket

I have a newly configured DRBD-Cluster 8.4.5 on 2 VM running ubuntu 14.04, following this example: http://geekpeek.net/configure-drbd-ubuntu/ Unfortunatelly I can not start the service. It seems to ...
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42 views

Network traffic being automatically balanced instead of only through one interface

I have 2 servers each with 2 network cards running through two totally separate networks. One network is a public facing network and the NICs are configured with public IP's. The other network is a ...
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50 views

iptables rule limiting the number of connection in a broken pipe case

I am limiting the number of SSH connections using iptables but in case of, for example, a broken pipe (computer goes sleep mode, network problem, etc.) I am no longer able to reconnect. The rule I ...
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131 views

Inconsistency in TCP and HTTP connection management

I observe following scenario in WireShark: The problem I see here is that after receiving [FIN, ACK] from server (4090) and acknowledging it (4092), http client attempts to send another HTTP ...
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36 views

how could I change the IP address dynamically

I bought many IPs for my VPS machine. But I don't get how to change the IP with the interface eth0, eth1. And it seems only eth0, eth1 can be seem with ifconfig And the machine will lose connection ...
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25 views

Network outage when machine on internal ipsec secured net crashes

We have 3 machines (Debian Jessie), each having 2 network interfaces. One interface is connected to the internet, the other to an internal net which is encrypted via ipsec/racoon. One of the machines ...
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75 views

Hyper-v virtual machine acting as two separate vm's

I have a Hyper-V virtual machine (vm1) that has two separate instances of itself. I can log into what should be the same VM (vm1) through Hyper-v and RDP (Remote Desktop Connection) with the same ip ...
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81 views

R packages - Should I mount /usr/share/R/library

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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64 views

Maximum Network throughput for SWIFT storage

I have a SWIFT cluster deployed as part of Openstack which is currently giving me a max throughput of 95 MBS(Megabytes per second). There are 6 proxy servers and 6 storage nodes with replication ...
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65 views

Exchange 2010 sp3 RPC connectivity between separate physical sites

Good evening! I have installed Exchange 2010 a few times in my life but never in an environment like this. Please don't judge me for this architecture, it wasn't my idea! ;) I have two physical sites ...
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456 views

OpenVPN sndbuf and rcvbuf

I would like to know what is the difference between the sndbuf and rcvbuf buffer used by OpenVPN and net.core.w/rmem_default or net.ipv4.tcp_r/wmem. What does OpenVPN do when some value a provided ...
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28 views

debian networking lacp throughput and redundancy

I am encountering the following scenario: Physical server w/ 4 NICs and two HP ProCurve GigabitEthernet switches in a stack $Server runs debian (proxmox ve latest) I'd like to configure the network ...
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75 views

Investigating connectivity issue

I'm trying to set a up a new service on a server that is running apache, however it seems like incoming traffic on that specific port is blocked, although I do not understand why. On the first server, ...
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65 views

logger not logging to remote rsyslogd instance

I am running CentOS 7.0.1406 with rsyslogd 7.4.7 and logger from util-linux 2.23.2. I have two machines connected via a switch. When I try to use logger to log from one machine to the other, nothing ...
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91 views

Setting up a caching system r/w in DCs across continents

We are going to implement a caching system to make our front-end servers which are located in different data centres in Asia, America and Europe can read and write some small JSON data in the shortest ...
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84 views

Datastores Occasionally Disappear on vSphere Client

I'm currently running several virtual servers and connecting to the vCenter using the vSphere Windows client. We're connecting with to a datastore on another server which has a separate folder for ...
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32 views

Can't connect to selenium grid on VM?

I have a VM on the same network as my computer. I can remote into the VM and open up the selenium grid console (http://(ip):4444/grid/console) and it appears to be working fine. When I try to open ...
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156 views

High bandwidth, high latency file transfer in Windows

We're attempting to transfer some SQL backup files (~5-75GB each) across a network with about 70ms latency between two servers (Server 2012 R2 - same domain) across a VPN connection. Both servers are ...
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122 views

How to connect to two different internal networks at the same time

I am still new at this, so please be gentle. My company recently got our accounting department a small Cisco 877W router so that they can connect to the Internet via DSL. The 877W is setup with DHCP ...
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175 views

Change source address based on destination IP: NAT or routing?

I have a router/host with multiple public IP addresses. I want to change the source ip depending on some destination addresses. This has already been asked here: If the traffic originates from some ...
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16 views

Cannot Ping DC with expanded scope

i have inherited a network and do not know how to find the culprit here is the setup 1. Server 2008R2 with DHCP 2. 2 nics, 192.168.1.6 Static, 192.168.2.254 nic 2 3. Subnet 255.255.0.0 4. Scope is ...
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58 views

Linux: Same static IP configured for all NICs

I am shipping some servers out to remote colo sites. I want to configure them so at the other end any port can be lit-up and the boxes will be good to go. I had originally been planning on bonding ...
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148 views

kvm guest routing with 2 default gateways

I have a kvm guest with two virtual NIC. NIC with internal IP III.III.III.III (eth0) NIC with external IP EEE.EEE.EEE.EEE(eth1) I'm using macvtap. The host has his own external IP. I can ping ...
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24 views

Routing is disabled for LAN users while choosing all-net for IPSec tunnel

I have VPN with L2TP/IPSec server and tunnel configured. When I choose all-nets 0.0.0.0/0 to allow connection from any computer in the world, all LAN users with subnet 10.0.0.0/8 are disconnected from ...
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34 views

Load balance 2 wireless adapters on 2 different computers (ie. w/NLB)

I have 2 physical servers running 2012R2. Each box has its own wireless nic. I also have 1 SSID to which both servers/WLANs connect to. While trying to setup NLB, I noticed the Wireless NICs didn't ...