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

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trouble setting up a small network- Can't Ping BorderGateway

RTR Configuration : http://pastebin.com/Pg4SxG65 Network Topolgy: https://goo.gl/h043A7 BR: its an RV320 if you guys need some info let me know. It's running DHCP to provide ip address to the ...
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57 views

Dealing with refreshed IP addresses in Docker

I'm trying to wrap my head around Docker and the various tools around it. And a common problem for me is that if my VM's are restarted, they might end up with different IP addresses. e.g. VirtualBox ...
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59 views

Cannot Route RDP Traffic Through AWS Site-to-Site VPN

Hi I have establish VPN connection to the AWS VPC, but still there are some routing issues that make RDP connections fail to initiate, because the router WAN IP is differs from the Public IP, lets say:...
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36 views

rx_queue value in /proc/net/udp grows to twice the SO_RCVBUF value

When using an SO_RCVBUF of 10485760 (which is also the current limit as stipulated by sysctl's net.core.rmem_max setting, and sending UDP packets faster than the receiving side is able to handle, the ...
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29 views

How do I set up multiple displays for a single computer over ethernet

Currently I have 4 computers in separate rooms, connected through ethernet. It is a dental clinic and those computers are used to plug in some equipment via usb. I was wondering if it would be ...
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96 views

How to prevent persistent naming of network interfaces, like eth1

I have a freshly installed Debian Jessie. I had two NICs, which were eth0 and eth1, now I took out one, however I still have eth1 left in the system: % dmesg ... tg3 0000:03:00.0 eth0: Tigon3 [partno(...
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66 views

Change NAT IP for Proxmox (Keep host IP)

I have a Proxmox server with many IPv4 addresses available to it. As it stands, an instance (Either LXC or KVM) that connects out to the Internet will be connecting from the host's IP address. For ...
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98 views

SYN flood on mysql server

Consider this structure: DB <-TCP3306- WEB{1,2,3,4} All servers are CentOS 6/7 Web servers are running PHP (using php-fpm) that connects to the MySQL server. Occasionally, I get this error ...
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137 views

What's your experience with the AWS NAT Gateway performance?

In December/2015 Amazon launched their VPC NAT Gateway service which is basically a managed alternative to creating your own (and it looks very good in comparison to NAT instances). I was just about ...
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23 views

MySQL proxy authentication options

I have a farm of production mysql servers that are currently protected by restricted passwords. I would prefer to restrict access to these systems at network level, but have to account for the fact ...
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26 views

DHCP: bad configuration fixed-address?

My configuration of DHCP is: dns-update-style interim; default-lease-time 86400; max-lease-time 86400; authoritative; log-facility local7; subnet 192.0.1.0 netmask 255.255.255.0 { pool { option ...
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121 views

Why is CentOS 7 ignoring NETMASK?

I have a networking issue that I eventually tracked down to an incorrect network prefix setting. ip addr is reporting that the current prefix is /8 when it should be /24. However, when I look in /...
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78 views

How do I use OpenVPN as an appliance in Azure to access protected resources?

I've been successful in creating a Virtual Network, adding subnets and security groups to different levels of our infrastructure, and installing OpenVPN on a VM and establishing a connection to it (...
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164 views

How to diagnose netstat: no namelist

I had to replace an NIC on my HP Proliant Microserver, running FreeNAS 9.3 In my crashplan jail, I now get "netstat: no namelist" as a response when I execute the netstat command. How to I diagnose ...
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41 views

Duplicate SYN package forwarded by Docker?

I'm experiencing a strange interaction between a CISCO firewall and my Docker host connected to it: the CISCO periodically marks my host as a SYN attacker and shuts my ethernet port down. I've been ...
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276 views

Strange iperf3 behaviour with UDP streams

I am using iperf3 verson 3.0.11 to measure the throughput of a UDP stream between two virtual machines. The virtual machines are deployed via OpenStack. Of the physical hosts, one is located in ...
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84 views

VRF-like multiple routing tables on Windows

Does modern Windows kernel support some kind of VRF-like (or Linux network namespaces) multiple routing tables? I am considering a Windows server with 5 NICs. Every NIC attached to its own VRF ...
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44 views

Why do nping packets with correct MAC and wrong IP do not reach the other container on the same net?

I have a Docker network with two containers in it. When I run nping with a fake target IP address and a real MAC address of the second container, the packets appear in the tcpdump -eni eth0 output ...
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107 views

Can Cat6A connector fit to normal gigabit network switch?

Cat 6A cable is thicker than Cat6 cable. For a Cat6 cable and connector, we can plug into any network switch that has RJ45 connector even a 100Mbps network switch. Just wonder if I use Cat6A cable ...
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43 views

Fallback internet connection with UMTS stick

I want to realize a fallback internet connection over mobile broadband. I have a umts stick which behaves like a network interface in linux (eth1) and a normal tethered connection (eth0). I am ...
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177 views

Change Windows 2012 R2 Network from Public to Domain

I upgraded the Network Card Drivers for my Domain Controller but now it is seeing the local lan as a PUBLIC network which is messing with my firewall rules. How do I switch it back to DOMAIN?
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30 views

gitlab port forward tom foolery

We have a public-facing web server (CentOS 6 w/ Apache) that will need to forward requests, both from public and a private interface, to a separate host that's running Gitlab. For security purposes, ...
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34 views

FreeBSD Bind locks up, only clue -> in6_ifadd: 2001:~ is already configured

I have an issue where my DNS locks up periodically (about twice a day). All normal and then suddenly denied access to net_if network: error: could not listen on UDP socket: permission denied When ...
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28 views

What would be the cause of openvpn network fault?

We have openvpn network for aproximately 1200 client connections. Basically everything is running fine but there exists 0-4 collapses per day (which occurs randomly), when we looses majority/all of ...
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249 views

SQL Connection Problems between two servers

I have two Windows Server 2012 R2 servers HOST1 and HOST2. HOST1 has a web application that talks to a SQL Server 2014 instance on HOST2. When pulling larger amounts of data, notably during scheduled ...
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71 views

ARP issuse in SUSE Linux

I am dealing with a very strange problem. I have a VM running SLES 11 SP4 in VMware Environment. The machine has two NIC. All of a sudden the second NIC stopped working. It's not even pinging the ...
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303 views

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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57 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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76 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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96 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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58 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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68 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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98 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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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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69 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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42 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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84 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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85 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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279 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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35 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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182 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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610 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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51 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 they'...
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129 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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144 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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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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197 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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82 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 ...