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

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2answers
63 views

Arbitrary loopback ip addresses besides 127.0.0.1

I am developing a web app that has to produce different output based on ip. For testing and during development it would help a lot if I could have more loopback ip addresses besides 127.0.0.1. Is ...
0
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0answers
53 views

Some client in my network, sometimes can't ping Gateway and DNS server

I've a local network with 100-150 clients, one Core Switch and 10-12 switch that Switchs are connected to the Core Switch and clients are connected to switchs. In my network sometime some clients ...
2
votes
1answer
166 views

How to ping ipv6 interface

I'm trying to get familiar with ipv6 I don't understand why I can't ping this interface at the inet6 addr eth1 Link encap:Ethernet HWaddr 08:00:27:77:9e:77 inet addr:192.168.33.10 ...
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3answers
34 views

Acces VPN over Windows network management instead of OpenVPN client

I am running openVPN on my Linux server and use openVPN Windows client to connect to it - everything is working fine. Now I was wondering if I can setup the VPN connection through Windows' network ...
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0answers
70 views

Poor network performance when fileshare with CentOS on HyperV

I own Fujitsu Siemens server (TX100 I guess – I am not able to check this as I manage it remotely). I have got Windows 2008 Standard R2 sp1 installed. On this server I run Hyper-V and in it I have ...
1
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2answers
65 views

KVM: All network traffic to one guest (firewall)

I am currently using a VMWare ESXi 5.5 server for my virtualisation. The network setup is like this: PFSense firewall is the center of it all and connected to: LAN Network (physical NIC 1 assigned by ...
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3answers
78 views

Should I get extra IPs?

This is my proposed setup using OpenVZ containers (hosted on Proxmox): CT 1: MySQL and nginx. Hosts all databases and multiple websites(domains). Used ports are 80, 443, 3306, 8080 CT 2, 3, 4: These ...
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0answers
14 views

Automated hostname availability for OpenVZ environments

for several years now I am administrating some OpenVZ Hardwarenodes with a fairly low amount of containers per node (10-20). I'm about to setup a new machine, and what's always bothering me is the ...
2
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3answers
197 views

What is the “right way” to monitor network?

My production servers are kept at US east coast and some of the supporting apps are kept at Amsterdam in Europe. There is a Nagios instance running at US east coast as well which does a few port ...
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2answers
44 views

Accessing Server hosted on USB remotely

I'm running a program called VMlite VNC Server for android on a set of Phones connected via USB to a windows XP machine. Due to the way we're utilising the phones, we need them unrooted and with Wifi ...
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1answer
25 views

Can I conclusively determine that a remote web server is denying access by blocking my IP address? [closed]

Let's say a web server administrator has configured his web server to deny traffic from my IP address or address range and throws an http 403 forbidden when I hit the site. (In this scenario I am ...
0
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0answers
43 views

Root denied login if networking down (LDAP environment)

I would like to know why I can't login as root (ssh, sudo or su -) when my LDAP is down or when I have some outage in my network. How to reproduce the problem: - Just change your DNS to something ...
0
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1answer
47 views

How is my GRE-Tunneled packet being routed? [closed]

I'm trying to figure out exactly what is happening when I create a GRE tunnel. My network looks like this (-> means directly connected): Computer A (eth0: 10.0.1.1) -> (eth0: 10.0.1.2) Router B ...
0
votes
2answers
31 views

DNS log on Windows Server 2008

In a Windows Server 2008 R2 machine, with DNS Server Role installed in a local network, can I read in some log which queries the network hosts have made? To obtain some list of the visited sites. If ...
0
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0answers
25 views

Apache Tomcat & SSL - not connecting from different Sub Network

we are deploying an Apache Tomcat .WAR application provided from a third party. We have followed all the instructions provided from the party. The specs are: windows 2008 server Apache Tomcat 6.0.37 ...
2
votes
2answers
72 views

linux caches route with IPs of machine it has no access to

I have a VPN with a gateway, and an application server. The app server only knows about the gateway of the VPN. The gateway of the VPN knows about the gateway of the physical network the vms are ...
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0answers
27 views

How to prioritize Squid Cache Delay Pools

So I have the following squid cache delay pool configurations: # DELAYS delay_pools 2 delay_class 1 1 delay_class 2 1 delay_access 1 allow parents delay_access 1 deny all ...
0
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1answer
54 views

How can I configure iptables to forward and forget?

I'm trying to create a front controller where users can connect to a specific port and have their connection redirected to a different IP/port. The reason I'd like to be able to do this is for ...
0
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2answers
94 views

The proxy server is refusing connections vs Access Denied

Our Network administrators configured Proxy server to block one website[LinkedIn.com]. On directly accessing http://www.linkedin.com/, seeing error message - "Access Denied". But when I accessed ...
0
votes
1answer
103 views

How to slow down and share incoming network traffic using TC (traffic shaping)

I am trying to slow down incoming packets for a specific program, while a second one will have full access to the unused bandwidth. In other words, I want to control the network bandwidth sharing in ...
0
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0answers
34 views

Access KVM guest via hostname on private virtual network

KVM on CentOS 6.5. Setup one bridge connected to internet. And one virtual network on subnet 192.168.100.0/24 DHCP start: 192.168.100.128 DHCP end: 192.168.100.254 How to ...
0
votes
1answer
39 views

what would happen when macchanger to gateway mac address? [closed]

I thought arpspoof GATEWAY_IP -t VICTIM_IP can be prevented by add a static arp entry on victim side, i.e. arp -s GATEWAY_IP GATEWAY_MAC I read ...
0
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0answers
40 views

PPTP server with multiple IP addresses does not let clients through

I have set up the pptpd server on a Debian 6 server. This server has multiple IP addresses where IP1 is the default eth0 interface IP and IP2 is the IP configured to eth0:0. On connecting to the ...
-2
votes
1answer
42 views

Which cloud providers which let you spoof an outgoing IP address, and how? [closed]

I have a web application which is load-balanced using LVS which has been hosted within my organization's network to this point. We've used both direct and tunnel routing within LVS, which results in ...
0
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3answers
80 views

Is it a good idea to only allows connections to be established in the LAN->DMZ direction?

I'm trying to setup the usual thing, with a DMZ containing servers that can be accessed from the internet, and a LAN that should be as secure as possible. I happen to also have total freedom on the ...
0
votes
2answers
61 views

packet loss between two specific VMs

I am experiencing some high-percentage packet loss (more than 70%) between two specific VMs in a local network, in a remote cluster (I have no physical access to it). One machine is used as a hadoop ...
2
votes
0answers
20 views

List subfolders somewhere in the path with rsync

I'm developing a program, that will recursively "walk" through Linux repositories, look for PXE-related files and create gPXE configs. I met across a problem with the structure of Ubuntu catalogs on ...
1
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0answers
18 views

Setting up a network with a UTM and a second firewall

Currently I have a m0n0wall working in my rack doing a good job. Now I want to integrate a Sophos UTM into my network. Is there any way to do this without doubling the firewalls? I know I could throw ...
0
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0answers
19 views

VPN User ACL not working

i´m currently testing a Cisco 886VA router for VPN usage. First off here is my client config group: crypto isakmp client configuration group VPN_PRIV key xxxxxx dns 192.168.111.100 pool VPN_POOL acl ...
1
vote
1answer
29 views

how to forward proxy requests using iptables

I've this schenario ----------------- ---------------- ---------- | SERVER A | ---(port:2128)> | PROXY | ---> | INTERNET | | (10.30.1.1) | ...
1
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2answers
80 views

Routing Internet traffic through computer on another subnet

Ubuntu box server has 2 network interfaces: eth0 50.57.71.100 eth1 10.182.161.100 Ubuntu box client has 1 network interface: eth0 10.177.30.100 server and client can already talk to each other ...
1
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2answers
36 views

Network Buffer Usage

I am facing some issues with my Application, and am curious to know the network buffer usage at any given moment. I am using a CentOS 6 linux Machine. I know the Default values are present in ...
-1
votes
1answer
44 views

How to measure network service quality? [closed]

How can I say if my network as a quality service? According to wikipedia (http://en.wikipedia.org/wiki/Quality_of_service ), an example on how to measure the service quality is high bit rate, low ...
0
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0answers
31 views

Multiple trunk links on firewall

I am trying to deliver VLANs (vlan 100 , vlan 200) created on a firewall http://www.fortinet.com/sites/default/files/productdatasheets/FortiGate-800C.pdf how ever i want to deliver them to two ...
4
votes
3answers
150 views

route cache filling with wrong entries

I have an issue with private network traffic not being masqueraded in very specific circumstances. The network is a group of VMware guests using the 10.1.0.0/18 network. The problematic host is ...
1
vote
1answer
64 views

server unable to find route to api.twitter.com

5 minutes ago, my server was unable to find route to api.twitter.com. mtr showed a blank screen. /etc/init.d/networking restart fixed the problem but I would like to understand what went wrong so that ...
10
votes
5answers
283 views

connecting remote site via fiber: layer 2 vlans or layer 3 routing?

Greets all, Back in the old days, when you had two geographically separated sites, links were pretty constricted so we put routers on them and, well, 'routed' between ip subnets-per-site. That was ...
0
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5answers
114 views

Giving an IP address outside the network to the router to safely make it a switch?

In our office, all machines use IP address 192.168.0.x with subnet mask 255.255.255.0, the network setup is as below: We only had routerA before. But since its wireless signal is too weak (much ...
0
votes
2answers
27 views

LAN resets if I reboot router, but is there a better way to troubleshoot the LAN connection [closed]

Ok, I have the typical problem of intermittent internet drops on my home network. To restore the internet, I simply have to cycle power on the router. Problem solved. But I don't understand why ...
0
votes
2answers
31 views

Suspect UDP traffic on lo interface

I'm monitoring the lo interface with iptraf and am getting a lot of movement in the following form: UDP (268 bytes) from 127.0.0.1:49254 to 127.0.0.1:49254 on lo This message appears on average ...
0
votes
2answers
57 views

DHCP complicates using IP Address Source in Amazon EC2 Security group settings

Background: I am learning to setup my amazon web services account. I watched a video tutorial(http://youtu.be/-xVyuLJZFYc), where they mention that within the security groups dashboard, one could ...
4
votes
1answer
64 views

Network traffic to server keeps dropping out

I have a production server that is responsible for controlling a factory. The server runs a number of control applications and a SQL server. The problem I have is that one of the applications that ...
0
votes
1answer
67 views

Cannot close Port 25 after installing postfix

Before installing logwatch (which installs postfix) on Ubuntu 12.04, the port 25 is blocked by iptables/csf PORT STATE SERVICE 25/tcp filtered smtp After installing logwatch (which installs ...
1
vote
1answer
31 views

Macvlan-interface and PPP-session

I need to pick up two PPP-sessions on the same interface with different MAC-addresses (on some device with openWrt). I decided to check macvlans. I created an interface with another MAC-address. ...
-3
votes
1answer
43 views

Bandwidth requirement to live broadcast an event on the internet [closed]

I am assigned on project to live broadcast an event on the internet which may have 50,000 user s. This will be a broadcast so all users will see same live video. My query is what would be my bandwidth ...
0
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0answers
24 views

Command “ip rule show” not showing anything

I try to list all routing rules, and as far as I know this should be accomplished with the "ip rule show" command. In my case there is nothing returned (really nothing at all). Why? Could it have to ...
1
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0answers
74 views

Unidentified Network for HyperV Internal Switch

I am trying to setup a HyperV internal switch for the guest OS on a Windows Server 2012 host. After creating the new Internal Switch through Virtual Switch Manager, I can see the virtual adapter under ...
0
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0answers
23 views

ifconfig: create and connect a simple lan segment in an openvswitch environment [on hold]

I am working with openflow and I have some virtual machines attached to the interface br0 (10.10.10.x/24). Br0 is not attached to any phisical interface, it is just a segment. Well, the virtual ...
25
votes
9answers
3k views

How can I force users from USA to go the USA server and visitors from UK to go to the UK server

If I have a single domain with visitors from both USA and Europe and also have 2 servers, one in USA and one in UK, how can I force users from USA to go the USA server and visitors from UK to go to ...
0
votes
1answer
46 views

How to setup windows server 2012 NIC settings with 2 NICs?

I have 3 subnets created in a Amazon VPC. Database private: 10.60.1.0/24 Application private 10.60.2.0/24 Public 10.60.3.0/24 I would like to have limited internet access to a server in the ...