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

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2
votes
2answers
42 views

Logging the outgoing port for IPV4

I need to become an IPV4 and IPV6 expert in a couple of hours. Our company is being bullied by the internet legislator in our country to move fast to offer the site in IPV6 only (we are just content ...
0
votes
2answers
30 views

my master dns is running on Debian, can i configure rhel as slave DNS

I need to configure a slave dns on RHEL 3 , but my master DNS is Debian 7, is it possible to configure dns on such manner if possible kindly help me on this
3
votes
3answers
855 views

I need more IP addresses. Can I change my mask from 192.168.x.0/24 to /16? Why not?

I'm using 192.168.x.x and have exhausted the IP pool. Since 192.168.0.0/16 is all private, why can't I just change the mask to 255.255.0.0 and start allocating out 192.168.x+1.x IPs? Edit: I realise ...
0
votes
0answers
8 views

limit openvpn users to certain cap

good day all after doing a fair amount of research I discovered that openvpn has a data transfer limit built in(also looked at ServerFault.com:"Limiting OpenVPN bandwidth"), however I require a ...
0
votes
1answer
42 views

Project Honeypot says my mail server has become a spammer

I need help diagnosing this: http://www.projecthoneypot.org/ip_66.18.204.186 It says my server has been sending spam for 4 months! I try to be a responsible mail server admin, I hate spam, I do ...
1
vote
1answer
27 views

NIC beginner questions [on hold]

Hi I wish to learn more about NICs. And I would really appreciate any answers or resources you could point me to! We have a small cluster at work, and I'm thinking about getting 2 to learn with at ...
1
vote
0answers
15 views

Make LXC containers available from the physical network

I've been trying to achieve the following. I want to use LXC as a thin isolation layer inside our physical machines, meaning each machine will have only one container running. For this container, I ...
-2
votes
0answers
18 views

Use multiple devices with an ISP with captive portal [on hold]

Here are the facts that will help you understand the scenario: The ISP provides wireless broadband. It gives a device(installed on the roof) from which a LAN wires runs to your computer. The ISP ...
-1
votes
1answer
18 views

vvg2000 netgear multiple ips [on hold]

i'm connecting my office to the world with pppoe and netgear vvg2000 router. this days i plug a web server for lcal testing and i want my clients to be able to see files on this webserver. since i ...
-1
votes
1answer
22 views

Direct Link To Remote Sites [on hold]

Currently we have users that needs a connection to remote sites, at the moment we have a site to site VPN in place but they are not happy with the performance of this solution and they have decided to ...
0
votes
0answers
25 views

cisco wireless router not allowing full tcp handshake when in router mode

I have a recently-purchased cisco rv220w wireless router. My setup is as follows: Internet -> asa 5505 -> 10.0.1.0 subnet -> wireless router (subnet 10.0.3.0, public facing ip is ...
3
votes
2answers
72 views

Windows Server 2008 R2 Network Load Balancing no balance

I set up a NLB cluster given two servers (WS 2008 R2). Each server has one NIC card which I set up for a static ip address. I assigned the cluster an internet name (MyCluster), and assigned it a ...
-3
votes
0answers
88 views

What is the best practice to build up a secure connection between networks through the internet in the described case [on hold]

I need to deploy services/servers on MyNetwork to be able to serve the described basic infrastructure: Original image Adding more description: 1. I'm having N Customers with their own LAN connected ...
0
votes
0answers
25 views

Configure an Azure VM for Dynamic DNS for Cloud Services

I am trying to setup an azure VM with proper DNS to allow multiple cloud services to communicate across cloud service boundaries. As I understand it, I need to provide my own DNS server. I do not ...
1
vote
1answer
63 views

ping works but ssh fails

machine1 IP: 172.30.11.119 machine2 IP: 172.30.11.120 machine3 IP: 172.30.11.121 machine4 IP: 172.30.11.122 Note: These machines are connected to LAN. I have configured the static ...
0
votes
1answer
22 views

TCP Zero windows size and full windows size

The problem that we are facing is that some of the http connection have response time > 60s (about 5%). I discover that the problem should between the web server and loadbalancer. Here is my finding, ...
-1
votes
0answers
20 views

What exactly is a datapath identifier (dpid) for a switch

One of the definitions of datapath identifier that I came across is as follows The datapath_id fleld uniquely identifies a datapath. The lower 48 bits are intended for the switch MAC address, while ...
0
votes
1answer
35 views

httpd: multiple IP addresses, go to the same location

I've been looking into this for about 30 minutes now and don't really know of any easy way around this. What I'm wanting to do is allow Apache to listen on all interfaces (this should already be ...
0
votes
0answers
32 views

forward Redis requests across AWS regions

I have a Redis instance running on AWS Elasticache in US-East. I have VPN servers running in Tokyo and US-East. The problem: How to allow Redis connections while VPNd to the Tokyo VPN? You can only ...
0
votes
0answers
27 views

Hyper-v network issues on initial connection

I am running hyper-v on very capable hardware, host is Server 2012r2 and guest is 2008r2. The problem I am seeing is that, when the guest has not had network access attempted in a while or has been ...
0
votes
0answers
17 views

Centos virtualbox proper configuration [on hold]

I'm trying to setup Centos 6.5 on Mac OSX so that: CentOS can use internet using NAT mode adapter 1 (eth0) Host (Mac OSX) can connect to Guest (CentOS) using static ip via Host Only mode adapter 2 ...
-3
votes
0answers
28 views

What protocol do these segments use? [on hold]

I'm trying to look at these two segments, and determine what type of protocol each one of these are (no Ethernet headers) The first one: 4500 001d 003a 0000 4011 bc19 c0a8 01ea 0ae4 4081 0400 0201 ...
7
votes
3answers
209 views

Maximizing rsync performance and throughput - directly-connected gigabit servers

I have two Dell R515 servers running CentOS 6.5, with one of the broadcom NICs in each directly attached to the other. I use the direct link to push backups from the main server in the pair to the ...
-3
votes
1answer
22 views

Multiple connections issue trying to connect PCs across network [on hold]

Trying to connect across network to PC runnign windows vista from laptop running Win 8.1. Am getting 'Multiple connections to a server or shared resource by the same user, using more than one user ...
-3
votes
0answers
17 views

virtual router plus could not be started [on hold]

I installed virtual router first, but it was not able to start. So I installed virtual router plus(VRP) software. I do "sharing" enabled in my broadband connection adapter "Local area connection". ...
0
votes
3answers
191 views

Why is router considered to be a layer 3 device while it can handle layer 4 headers too? [on hold]

I cannot understand why in technical texts, routers are considered layer three devices which work at network layer, but in practice, a router can handle traffics on the base of layer four headers ...
0
votes
0answers
19 views

For an organisation what are the disadvantages of using servers that are located in another country [closed]

For a company which does not have local servers, what are the disadvantages of using servers located in other countries? So say the company does have servers, and the company itself is based in ...
0
votes
0answers
16 views

muliple ssid's on same interface

I am working on centos6. I have 1 wifi interface. Can I create a virtual interface and create an adhoc network with it (my 'real' wifi interface is already connected to another ssid). This is what I ...
2
votes
1answer
80 views

xen creating a new virtual machine with bridge networking

I am using CentOS 6.5 64 use this tutorial to setup Bridge [root@CentOS ~]# brctl show bridge name bridge id STP enabled interfaces xenbr0 8000.08002754b3fa yes ...
-2
votes
2answers
42 views

CentOS 6.5 not bringing up network interface automatically after reboot [ifup eth0]

I am having this issue with many of my CentOS servers where after a reboot the network interface fails to come up automatically. This is a big problem for me since I need to drive to the datacenter ...
0
votes
0answers
32 views

How to failover a Linux router? [closed]

I have read some articles of router failover but none is solving my issue. My issue is offline failovering, that is, the failover machine is brought up only when a failure is detected. My ISP uses ...
0
votes
2answers
34 views

Wrong default gateway assigned [closed]

I am using Windows 7. Here is a correct ipconfig which helps me connect to Internet: IPv4 Address 192.168.1.100 Subnet Mask 255.255.255.0 Default Gateway 192.168.1.254 It happens so often that in ...
-4
votes
0answers
20 views

Wireless internet connection via two enternet ports? [closed]

I've tried searching for this via google, and here, but I'm proably not using the right terms for it. Anyway, a friend of mine recently got a 'new' (New to him) computer to replace his old laptop. He ...
-2
votes
1answer
64 views

How can I detect if an online backup service is doing IP-based throttling? [closed]

I live on a campus in the US and I am trying to understand why my upload speed to the online backup service Backblaze on area Y of the campus is 10 times slower than on area X of the campus (20000 vs ...
-6
votes
1answer
56 views

Is running our workstation network through VoIP handset best practice? [closed]

We are purchasing a Cisco UC VoIP phone system and the handsets come in two flavors: 100mb and 1gb. Both allow network pass-through of another device such as a printer or workstation. Is this an ...
-1
votes
1answer
45 views

Two NIC (eth0,eth1), two global IP on same subnet. Became unreachable to IP on eth1 after reboot

I configured a CentOS 6.5 virtual server and deployed it to a remote VMware vSphere environment. We needed two IP address, so I added a virtual NIC and assigned a second IP on eth1. I didn't ...
5
votes
2answers
194 views

Windows workstations in a Windows domain with a Linux domain controller [closed]

There's a Windows network of about 60 workstations I am going to be responsible for. The network is in a terrible mess, so I decided to rebuild it from the ground up. Currently, there are some Windows ...
0
votes
1answer
26 views

Changing the default gateway, multiple NICs

I have Ubuntu 13.10 (kernel 3.11.0-19-generic). On startup, the network configurations are as follows: dor@ubuntu:~$ sudo ifconfig -a em1 Link encap:Ethernet HWaddr 44:37:e6:4c:ca:0a ...
1
vote
0answers
21 views

Firewall and NAT settings in GSM modem for one server

I have a GSM Modem (PSI-MODEM-GSM/ETH) in field with one device behind, acting as a server. The situation is as follows: "PC" | \_________Dynamic IP: 10.103.153.122 | ...
0
votes
0answers
7 views

consentry network switch removing security

I have a few old 'consentry network switches' that I can access the console on easily as they are at factory defaults. I want to be able to disable the lanshield security so any device can be plugged ...
-2
votes
1answer
48 views

How to access device on switch from another computer? [closed]

I have several computers all connected to the same switch. Some computers are running RHEL, one is running CentOS. The CentOS machine is connected with NIC 2 to switch 2, and NIC 1 to switch 1. The ...
0
votes
1answer
26 views

Force all traffic from servers on the same bridge to pass through router interface

I have a bridge with all hosts from the 192.168.5.0/24 network connected to it.They all connect to this bridge via a secondary interface eth1. I have a router which connects this bridge to others on ...
0
votes
0answers
3 views

Not able to ssh into host from KVM guest when using user mode networking(default) [migrated]

I used virtual machine manager to create a Ubuntu VM which uses default NAT based networking still using the default address 10.0.2.2 I am not able to ssh into the host, neither can I connect to VM ...
2
votes
1answer
68 views

High throughput meshed VPN to connect datacenter hosts

We're renting a number of hosts in a public datacenter. The datacenter does not offer private VLANs; all hosts receive one (or more) public IPv4/IPv6 addresses. The hosts come with very modern CPUs ...
0
votes
0answers
22 views

Multiple gateways with linux on same subnet using single NIC

I have the following configuration; Firewall 1 (site 1); x.x.x.x/26 subnet on external 10.0.0.0/8 on internal (internal IP 10.0.0.10) Firewall 2 (site 2); x.x.x.y/26 subnet on external 10.0.0.0/8 ...
1
vote
1answer
47 views

how can I present a network diagram on the building that has 3 floors

How can I present a network diagram on the building that has 3 floors? The requirements are to separate the users in one LAN according to their department, what confuses me is on the second and on the ...
-1
votes
0answers
18 views

How to setup properly host on IIS

Let me start from describing my network, since I think this might be crucial, so this is how it looks like: Other home devices. (static DHCP via MAC-IP bindings) ...
0
votes
0answers
19 views

Proxmox private network between KVM and VZ

Sorry for asking this eventually trivial question, but I'm fighting with this for more than a day, and was unable to figure this out by myself so far. Situation Proxmox host running a bunch of ...
-4
votes
2answers
35 views

How to manage PING replies? [closed]

How can I manage, for example, my Ubuntu mashine so it doesn't (or does) respond to PING(ICMP ECHO_REQUEST - type 8) requests? Normally almost all computers in a LAN network responds to ping with an ...
3
votes
1answer
42 views

Should Skype be reliable in a corporate environment?

I've move this from SuperUser after moderator comment. Its not a discussion. I am asking if my theory is valid. I have been managing the IT function in a small software development company that has ...