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

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16 views

Wondering something about netstat [on hold]

In my enterprise, when I run the netstat command, I can't see any internet connections. All I see are connections to internal resources in the 172, 192 and 10 dot address spaces? Why? I'm guessing ...
0
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0answers
9 views

Configure freeradius as a linux service

I install freeradius-2.2.0-7 on CentOS 7, and I finished configuring it, for the test on the same Linux host, he replied "access-accept" but when I repeated the same test from another host on the ...
0
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0answers
9 views

network low bandwith in qemu-kvm guests?

I deploy virtualization by qemu-kvm on a CI7 CPU and 16G RAM host. I have a VM on an other host witch work perfectly. The i clone it and move that VM to That host and run it. After running, That VM ...
0
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0answers
18 views

hyper-V GUEST don't ping with rest of physical network

I have one hyper-V 2012 and two vm running with Windows Server 2012 Standard. My problem is that the VMs don't connect to my network, only the host does. I've been trying everything I could but ...
0
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1answer
22 views

Avoiding a Single Point of Failure with link aggregation

I have a requirement for a system with no Single Point of Failure. The client have offered two Ethernet cables per server. Each of the servers will connect into their network, however I want to ...
0
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1answer
27 views

load balancing multiple connections over multiple links

As I understand it (based on the kernel docs) the setting of "arp_filter=1" necessitates the use of a source based routing policy to allow multiple interfaces to route traffic, potentially (but not ...
1
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1answer
38 views

How to perform an assessment of an existing network?

I work as an IT guy for a small company with 2 offices. Currently we are in the process of moving our entire network infrastructure to a different host because we are running everything on extremely ...
0
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0answers
30 views

2 Webapps hosted on same server talking to each other - do they use eth1 or lo1?

I am trying to establish bandwidth needs for a set of webapps in the company. I am using SNMP to monitor the bandwidth on the eth1 interface, however I am trying to establish what is going over the ...
0
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1answer
42 views

Same routes under VPN - how to workaround?

I only have basic experience with VPNs (mostly OpenVPN) and mostly theoric, but now I want to set up something more complex and I am evaluating the possible issues that I may face. I will try to ...
3
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1answer
69 views

Massive packet duplication

Short Version: We've had a problem with a particular server receiving massive duplicates of packets. After much fault finding we found the problem was caused by a switch sending my packet out every ...
0
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1answer
23 views

How do I know website slowness is related to network or my server

I do know that my php pages generate in less than 0.1 seconds. And also I do know that apache max clients has not been ran out. And website is slowness is confirmed by testing from different ...
0
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1answer
20 views

How to connect remote client software over VPN to DVR

Junior sysadmin here: I would like to enable a remote user to view security camera footage on DVR using its client software installed on the remote machine. Software is Nuvico CMS Lite, DVR is also ...
0
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0answers
34 views

Why are websites being served correctly for a little while and then not?

I just moved a server behind a Cisco ASA 5525-X and configured the ASA for the first time. The ASA has ACLs to allow bidirectional communication on port 80 to the private IP address on the inside ...
0
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0answers
11 views

Netgear VPN can't access specific server

I have a Netgear FVS318N configured with a VPN. I'm trying to access my call recorder with the provided software from another office. I've already setup the VPN connection, and it works. I can connect ...
0
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0answers
23 views

Literature for Nagios XI monitoring system [on hold]

My aim is to implement nagios into an existing network. However I never used nagios before and I'm looking for a proper book which contains an easy introducation as well more specific parts. Can you ...
0
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1answer
37 views

How to mass install/register software licences on windows systems?

Say I have 100 new laptops that come pre-installed with windows 8.1, antivirus and microsoft office. I purchase 100 licence keys for both antivirus and office. Is there a way to automate the licence ...
1
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2answers
265 views

Low latency TCP settings on Ubuntu

There is a server for measurements running on Ubuntu in my lab . And there is C program, which receives data through TCP connection and should as soon as possible send a reply. Network latency when ...
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0answers
27 views

Lot of traffic on network [on hold]

forgive the very lame question but I have a quick question for some time on my network some host generates a lot of traffic, has anyone an idea as soon as possible to trace this host? Regards Mick
0
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3answers
51 views

is it possible in this case to get two IPv6 networks to communicate over the IPv4 Internet?

I have a setup of a laptop connected to a cellular IPv4 network (3G usb dongle) and PC connected to another IPv4/IPv6 network. Both have been configured to run as IPv6 routers and each has its IPv6 ...
0
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0answers
6 views

Dynamips Virtual Router not pinging external host after bridging

I have setup a virtual router image with dynamips and setup bridging between tap0 interface of the virtual router and eth0 and br0 with commands [root@cisco_host]# brctl addbr br0 [root@cisco_host]# ...
0
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0answers
18 views

Conflicting ip routes with local table on attaching a virtual network interface

I have an EC2 instance with these ip rules: $ sudo ip rule show 0: from all lookup local 32766: from all lookup main 32767: from all lookup default I can attach an elastic network interface to ...
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1answer
37 views

Networking failover

i am not much expert at network side , i am looking for help... we have main office and branch office, both are connected through fiber cable. we are planning for long range wireless also for ...
1
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1answer
21 views

Is there a way to get current txqueue utilization on e.g. eth0 or tun device?

I have detected drops on my tun0 interface. They seem to have been caused by low txqueuelen setting. Now as I increased the txqueuelen value for the network device and there are no more drops yet - ...
0
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1answer
12 views

What do I need to consider when setting TCP idle timeouts?

What's purpose of having a [low] TCP idle timeouts? E.g., why have a 60 second timeout on a firewall or load-balancer? Is it a memory management or /performance optimization thing? Is there a security ...
0
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0answers
4 views

Two IPv4 adapters in same PC on same network valid? [migrated]

Is it valid to have two network adapters on the same PC have the same network portion in their IPv4 address? If not why is my DHCP server doing so and how should I setup my DHCP server to have it ...
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2answers
37 views

Multiple non-http services, 1 static IP

I have an issue where we have several non-http(s) services which we would like to access from across the WAN. SSH is a primary protocol we'd be using, FTP as well. Here's how things are laid out. We ...
0
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1answer
8 views

Working WCF WebServices with NLB server

Im starting the architecture of a new project using WCF, but im not the right person to make some network considerations, so im doing some research but cannot find the answers to these questions: ...
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2answers
45 views

how to get ip address of a PPP(Point-to-Point Protocol) network interface?

I have a Linux machine with two network interfaces, and I'd like to get the IP address of the PPP interface w1g1 but it doesn't show up in ifconfig. There is a public IP on the PPP interface, but ...
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0answers
31 views

“Network name cannot be found” just on some shares

We had an Windows XP in a VMWare virtual machine joined to an Active Directory domain. DC servers are Win2008 and the workstations have static IP addresses. Because the HDD with that vm (called P2) ...
0
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0answers
17 views

Create account for service

I am configuring a new server. The server is running Hudson that is going to copy some files from this server to another. The other server is a virtual machine. Both running Windows Server 2012. ...
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0answers
30 views

Solution for file store needing large number of simultaneous connections

So I'm fairly new to large-scale architectures. We're currently using linode instances for our project, but we're brainstorming about scaling. We need a file store system than can deliver ~50mb ...
2
votes
1answer
70 views

What is the correct iptables rule when NATing multiple private subnets?

I have a Centos minimal 6.5 acting as a router. eth0 is connected to a Cisco switch trunk port, allowing VLANs 200-213. I have several VLAN interfaces just as this link suggests: ...
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1answer
38 views

tc-qfq is classless error

I'm using Linux 3.0.101 with iproute2-3.4.0 on a router and I'm getting this error: tc qdisc add dev eth2.2 root handle 1: qfq --> OK tc class add dev eth2.2 parent 1: classid 1:10 qfq weight 1 ...
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0answers
18 views

Problems with Windows Server 2012 Hyper-V [on hold]

I install a windows server 2012 R2 and then install a virtual machine on hyper-v. When i configure the virtual machine in hyper-v i configure 4gb of ram then few days later y change it to 12gb of Ram ...
0
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1answer
49 views

Blocking an SSDP Flood

I've been hosting game-servers since a long time and I keep updating my iptables firewall time and again to block most attacks. One of my game-server port is being flooded with "SSDP" requests and my ...
0
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0answers
10 views

Want to route NFS response via an interface. What will the source ip of the packets being sent out?

The NFS server is listening on an interface for a new connection, once a new TCP connection is established the NFS operation is carried out. I'd like to send this NFS response via a different ...
0
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1answer
24 views

How to set up vpn tunnel (ipsec) connection

I'm working with a client who wants to set up a vpn tunnel between their network and ours. They're in charge of the tunnel and to give us the access they are asking me my public IP and my LAN IP. ...
1
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2answers
30 views

Ways to setup a ZFS pool on a device without possibility to create/manage partitions?

I have a NAS (Synology DS214 with DSM 5.0) where I don't have a possibility to create and manage partitions (maybe I could with some hacks that I don't want to make). What ways to setup multiple ZFS ...
0
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1answer
32 views

peer to peer disk image transmission

Installing linux/windows through pxe works smoothly for me. But downloading images(especially windows) is a headache. Let alone the time, bandwith usage is horrible. And p2p tech comes to my mind. ...
0
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1answer
19 views

iptables and TPROXY support

I'm running iptables v1.4.21 on Ubuntu 14.04 and is trying to setup iptables to use TPROXY. How can I check whether my current build of iptables supports TPROXY? I can check TPROXY support for ...
0
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2answers
83 views

RV042. Public IP on LAN port. Is it possible?

I have a RV042 router with a public static IP (XXX.XXX.XXX.42) and 4 LAN ports assigned to net 192.168.1.0/24. Can I connect a host to one of the LAN ports and assign it a public static IP ...
0
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0answers
57 views

TPROXY Not working with HAProxy, Ubuntu 14.04

I'm trying to use HAProxy as a fully transparent proxy using TPROXY in Ubuntu 14.04. HAProxy will be setup on the first server with eth0 111.111.250.250 and eth1 10.111.128.134. The single balanced ...
0
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1answer
25 views

Using 2 Transparent HAProxy for load balancing

We can configure HAProxy to be a transparent proxy by using the guide here, where one of the steps says ...to put the backend servers in a different subnet to the front end clients and make sure that ...
-4
votes
1answer
43 views

AWS - What do we mean by associating a subnet with an elastic network interface? [closed]

I'm trying to understand the meaning of this output: [user@ip-10-1-3-12 ~]$ ip route default via 10.1.3.1 dev eth0 default via 10.1.0.1 dev eth2 metric 10002 10.1.0.0/16 dev eth2 proto kernel ...
0
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0answers
6 views

Draytek AP Wireless Bridge IP Issues For LAN Devices

OK, I have a very messy network at my office, piggybacking off a neighbor's WIFI for internet (with their permission). I have a Netgear Router + DNS (DGN2200) connecting via LAN to a Draytek 800AP. ...
0
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2answers
50 views

How many IPv6 addresses can one network card have assigned to it, and what is the benefit?

This is not my area of expertise, so forgive me if I am getting this completely wrong. Some datacentres are now offering IPv6 addresses and potentially 100s per VM. What would the benefit of this be? ...
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votes
1answer
50 views

What would be the side effect if I use network address as my IP address? [closed]

I have read at multiple places that network address is a reserved IP and is not recommended to be used as an IP address for an interface. However, I do not see any immediate error or other side effect ...
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4 views

Firewall Ports for Toshiba CIX server

Other then SIP ports: 5060 and 5061 what other ports need to be opened to have a phone set up in a satellite office with via external IP address. Phone Server CIX100 Firewall ASA 5510
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0answers
9 views

problems in configuring a modem wirelessly [closed]

Hope you are doing well. I'm new to networking and as my first project I want to configure my TP-LINK wireless modem router. When I type 192.168.1.1 in my browser, nothing happens and I just see ...
0
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0answers
3 views

network adapter not listed in my virtualbox vm [migrated]

I am trying to SSH into a virtual machine I have set up in virtual box from my Windows 7 host machine. I would like to make several development machines and ssh into them from my host machine, as well ...