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

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Diagnosing slow server networking

So, I have 3 servers all networking together to run a single high traffic website all of which use Cloudflare for reverse proxy purposes. Two are webservers (which are identical) and one is a ...
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Can't access server after editing network interfaces during openstack installation

I was following the instructions at http://www.tecmint.com/openstack-networking-guide/ to configure openstack networking for openstack interfaces. I found I had two network card files, I edited the ...
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38 views

libvirt IPv6 Guest can't connect outside of the Host

i am trying to get a address from my IPv6-Subnet working in a Virtual Machine(libvirt, qemu). IPv4 over nat works like a charm. The host is a Debian 8.5 with qemu 1.2.9 and a 4.6.3-1~bpo8+1 (2016-07-...
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10 views

Freesco cant ping other machines [closed]

Im having some trouble with setting up Freesco on my VMworkstation, hoping someone can help.. I have a freesco VM with 3 NICS NIC 1 - Bridged with host 192.168.0.2 255.255.255.0 GW 192.168.0.1 (my ...
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18 views

CISCO: Use Specific Outbound IP For Locally Initiated NAT-ed Connections

I have a CISCO 2911 router, multiple public IPs and few servers. I have setup my router (ROUTER1) to be accessible through internet-accessible public IP (lets say) 190.0.0.250 and its local IP to 10....
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1answer
13 views

Accessing to a remote PostgreSQL server using port forwarding to another machine

I try to access to a Server_A on which PostgreSQL is running. This server is on a local network, that's why I have to forward port from Server_B which is accessible and in the same network. To access ...
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1answer
44 views

Is it necessary to include “Connection: Keep-Alive” in the response message?

Based on my understanding, a server uses the Connection: Keep-Alive header in the response message to tell the client that it will not close the connection after sending the response message. But is ...
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1answer
67 views

What does “Connection: close” means when used in the response message?

When the client uses the Connection: close header in the request message, this means that it wants the server to close the connection after sending the response message. I thought that this header is ...
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1answer
45 views

can't connect to couchdb remotely

I am trying to connect to Couchdb remotely, however, I just get Unable to connect . I can ssh into the server (actually just a Raspberry pi currently) through an ASUS router. netstat -an | ...
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18 views

CentOS/RHEL Limit Bandwidth to specific IP

The scenario: We have a file server (local1). local1 is directly internet connected (no router/firewall in front). We have several remote VPS nodes (remote1,remote2,remote3). We use UDP (udt-...
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1answer
105 views

When wouldn't an ARP reply be generated?

Summary of the problem: a ping from client does not go to rpi1, its ARP call is not answerd at srv. host0and tap0 are bridged by br0. vpninand lan0 are two independent interfaces. All traffic ...
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69 views

Access through jmx to java application into Docker container on remote host in local network

I can't connect through jmx (with VisualVM) to java application into Docker container on remote host in local network. Screenshot of the problem. Case 1: Java application into Docker container on ...
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1answer
17 views

Ubuntu 12.04 server cannot access anything outside

My Ubuntu 12.04 server was working fine a few days ago. But today I couldn't access anything outside. And i cannot ssh to my server neither. I am directly plugged into the console through my vps ...
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0answers
24 views

Getting slow upload (to internal Win box) only from Win10

I have a user in the office who was on Win7 Pro. Since there's a Win10 upgrade going, I thought I would test/piolit it with her, so I loaded Win10 on a spare Lenovo box (MT-M 7052-A7U). Everything ...
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1answer
20 views

Issues with DMZ on Fortigate 90D, second router can't reach internet

I am having issues setting up a DMZ port on my Firewall (hardware router). I am also assuming this belongs in Super User, as it seems like a basic DMZ setup. Here is the setup: I have a Fortigate 90D ...
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1answer
29 views

Why is my host not receiving packets sent across tun0?

I have a tun0 interface set up which allows packets to be sent as such: HOST (aaaa::1) ----> tun0 ----> SLIP ----> Router (aaaa::200:0:0:1) The router receives the packets, and can send back a ...
2
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1answer
16 views

Ubuntu VMware (Windows Host) - Apache only routeable by LocalHost

I am a Windows based, python developer, who is currently working with configuring his first linux VM. I am able to get the VM set up, with internet access. I can apt-get with no issues. After ...
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0answers
55 views

Painfully slow network when routed through Windows 2012 R2

I have a Windows 2012 R2 server with two network adapters, on-board 1G one for the LAN and a 100M D-Link 530T connected to the internet. Internet Connection Sharing is set up on the latter. Client ...
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31 views

Safely restart network via ssh to set static ip

In my /etc/network/interfaces.d/eth0 I have set: auto eth0 iface eth0 inet static address 10.0.0.25 netmask 255.255.255.0 gateway 10.0.0.1 dns-nameservers 8.8.8.8 8.8.4.4 Which ...
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0answers
4 views

Bind OVSBridge to an already bound port

I want to enslave a NIC to OVSBridge which is already enslaved to a Bridge. Is that possible, if yes, how ?
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35 views

Running a router inside an OpenStack VM

I'm trying to make a router VM (actually an IPsec VPN server) inside OpenStack. The OpenStack is an installation of Mirantis 7 (why not newer? 8 from some reason causes kernel OOPS to the same image ...
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26 views

Windows 2012 R2 VPN over WAN to domain best practice

I have a windows 2012 r2 server and it's connected to our domain over WAN via VPN. We are using a standard dial-up connection. All works fine however periodically the connection is dropped and we ...
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3answers
135 views

KVM-Host lost connection to Storage

I would really appreciate some advice on how to fix this. I have a Debian KVM-Host with 9 Debian VMS running on it. The virtual machines are running on my little Storage via iSCSI. Now, my switch ...
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2answers
104 views

pfSense on x64 hardware increased network performance?

Main server has 50x50 mbps dedicated fiber ISP. We currently have a Netgear FVS336Gv3 wired router with WAN to LAN throughput rating of 300 mbps. This device performs all routing to/from the internet ...
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0answers
66 views

How can I identify a rogue IPv6 DHCP server on my LAN?

This will be kind of a long post, but I want to give complete information. I have a home/business LAN with isc-dhcp-server running an ipv4 dhcp server and bind as a DNS server running on an ubuntu ...
18
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2answers
2k views

Why should I use an FQDN instead of the server's IP address?

In my work with servers I have come across in configuration files where you should enter the address to an external server. I have seen some use the server's IP address directly, but I have heard many ...
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22 views

Using reverse proxy but Site not loading [closed]

I have two websites example.com example.net both sites have its own server example.com is found in x.x.x.1 example.net is found in x.x.x.2 both using port 80 I have only one static public ip and I ...
2
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0answers
24 views

“Bridge” host-only adapter and NAT adapter in a VM for other VMs?

I'm running Foreman locally in a VirtualBox machine with a NAT adapter and a host-only adapter. I'm running another virtual machine locally which is bound to the same host-only adapter. I can get the ...
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1answer
31 views

Router can connect to internet but clients intermittently can't get beyond the router [closed]

Currently working with a small business which is using an ISP supplied domestic ADSL modem/router to connect their internal setup to the internet and this is also being used for DHCP. They're having ...
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0answers
12 views

Two host communication on same gateway [duplicate]

I can't ping or enter any opened port on host which ip is for example: 125.45.47.44 My ip is: 125.45.47.22 those IPs (public IPs) provided by our ISP Gateway is: 125.45.47.1 On this IP: 125.45.47.44 ...
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21 views

Sonicwall inter WAN interface communication

I have the TZ105 sonicwall and X0 is LAN and the rest 4 interfaces are 4 different ISP connections through 4 ISP routers respectively. Basically I cannot get any device connected to an ISP router to ...
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18 views

“Connection timeout” when accessing application server (CF8.0.1 on redhat) via LAN computer

I have a Coldfusion 8.0.1 server running on a Redhat server on my LAN. It's running on port 8500. I can access the Tomcat landing page if I remote into the server and navigate to http://localhost:8500....
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23 views

How to filter outgoing Ethernet packages by Ethertype?

I'm working with Ethernet Powerlink, which is a real-time protocol using standard Ethernet hardware, but forbids any interfering Ethernet communication. Now, when I connect my Linux laptop to the ...
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1answer
25 views

How to use another IP-address for outgoing traffic?

Background I run a server with two external IPv4 addresses. IP-address A (IP-A) and IP-address B (IP-B). Goal I would like to access IP-A over HTTPS port 443 and SSH port 22 only. IP-B shouldn't ...
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1answer
24 views

Vyatta Destination NAT not working

We are running into an issue adding new IPs to a vyatta device after exceeding the limit of IPs in our first VRRP group. All of the IPs listed in the vrrp-group 1 work fine but any I add to vrrp-...
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13 views

Which SNMP OID can I use for my software project? [duplicate]

I have a small Python script which is run by crontab. I want the script to tell me via snmp that it finished successfully. Are there any OIDs designated for situations like this (like the private ip-...
0
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1answer
32 views

Get network interface Nginx is receiving request on

I have a server with multiple network interfaces, and I want to write a proxy server, which would listen on all of these IPs. My config so far: server { listen 111.111.111.111:40000; ...
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22 views

Cannot login using SSH with password on Dell n2024 switch

I have configured SSH server on a Dell n2024 switch (firmware 6.3.0.9), but cannot login. The connection starts, but my ssh client waits indefinitely after trying key exchange, it does not continue ...
0
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1answer
64 views

Why should I use VPN in this scenario?

I have one web application, that is deployed on cloud. Now, this web application needs to access 3 Postgres databases, located in 3 different location(Lets call them, client systems). So one day, I ...
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33 views

Slow NIC Speed on 2 Dell Servers

I’m getting very slow NIC speed (both LAN & WAN) on two Dell R610 servers. I have multiple other R610's with same specs, connected to the same Cisco 3750 switch and they're fine. I've done a lot ...
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1answer
31 views

ARP spoofing on switch across subnets

Consider a switch without any VLAN's defined with 2 subnets configured. Is it possible to ARP spoof from one subnet to another? According to Evans reply in What are the implications of having two ...
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vmware windows 7 network driver not installed [migrated]

I´m using VMWare Workstation 12 Player to install a fresh copy of Windows 7 Professional x64 using my current key, so that I can later upgrade it to Windows 10. I´ve created a fresh VM and installed ...
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0answers
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Rabbitmq listener across machine not detected

I have multiple rabbitmq listeners running across linux boxes. However when I post a message A (which takes some time to process , around 5 mins), new messages after A wait in the queue till A is ...
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0answers
33 views

Weird thing with Vagrant and DNS on my Ubuntu

On my local computer I have make a record on hosts file pointing to a specific IP address. The record is like the following: 199.199.199.147 my-local-domain.ext The above domain it is required ...
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1answer
29 views

Throttle incoming connections with iptables

I have a slightly self-inflicted DoS happening in some circumstances, and I'm trying to figure out if I can use iptables to help mitigate it. The short version is "How can I limit the rate of incoming ...
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1answer
58 views

How to use native ipv6 together with 6to4? I got lost packets

I've found that I can't run native IPV6 interface (at eth0) with 6to4 tunnel (at tun6to4) together. Here's my setup (/etc/network/interfaces/): auto eth0 auto bond0 iface eth0 inet static ...
2
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1answer
25 views

LAG on one managed switch

This may be a dumb question, but is there any benefit of using LAG on only one managed switch with 2 VLAN's? By default my switch, Netgear GS724T, assigns 8 LAG's to the default VLAN. I am using VLAN1 ...
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0answers
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Propgation / Transmittion delay diagram [closed]

I have this following question to which I need help. I have this network diagram: I need to calculate the time it takes for a 1 KByte package to reach from S to D. I know the path is S->R1->R4->R5->...
4
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1answer
37 views

Using a 1G Ethernet Pass-Thru with BL460C G7 blade?

I've installed a new G7 BL460C into my HP BladeSystem C7000 enclosure. I have not had a G7 before. In the enclosure I have two 1GB Ethernet Pass-Thru interconnect modules (406740-B21). I am able to ...
11
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3answers
1k views

Effect of distance from server

I have a web server in Ireland (Amazon AWS). This server appears fast from Germany (orange line) but slow from the USA (black line). The HTTP request used for the test is the same. I think this is ...