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
62 views

What's the difference between .0/32 and .1/24 in CIDR? [closed]

We're specifying CIDR addresses in AWS rules, and I came across something I don't understand. /32 means one single address. So 10.0.0.0/32 means only the single address 10.0.0.0. But an address ...
3
votes
1answer
55 views

SSH hangs for several minutes at a time

I can SSH into a server and run commands just fine, but usually within a minute or so the session will appear to hang (become unresponsive). I can type commands but they're not even echoed on the ...
0
votes
0answers
57 views

Site to Site VPN tunnel to private network

I'm looking for a little help with a network setup. I have a router which I will be using for routing network, this will be 10.0.100.1 and it will be connected to the internet with a public static ...
0
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2answers
69 views

Network account problems with mac server OSX 10.6 Snow Leopard

Okay the situation is this. Yesterday my company changed our dns server, because our former one, was too unstable to work with. anyway today i went to one of our mac server, because it needed to be ...
1
vote
1answer
103 views

Why is remote desktop still not working?

I regularly use remote desktop to connect to PC's at work instead of going an physically sitting on the machine. We have 2 new computers, 1. Windows 7 2. Windows 8.1 ... I'm trying to connect to them ...
0
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0answers
19 views

Multihomed FreeBSD10.1 on AWS

I have an AWS t2.micro instance running with two network interfaces. I have set it up to run nginx on one interface and everything else on another. rc.conf # EC2 uses DHCP; the network interface ...
1
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1answer
51 views

How would traffic be routed with this routing table

I ran across two entries in a linux routing table that both have the same destination, but have different gateways. How would this traffic be routed? I've been searching around online for additional ...
0
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0answers
39 views

Why does Windows XP run applications from network shares so much more quickly than Windows 7?

I have multiple clients that run all sorts of (mostly badly-designed) software off network shares. The design of the software is such that it's intended to do so - the server runs the database locally ...
0
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1answer
23 views

Howto forward traffic between multiple OpenVPNs

I have an OpenVPN server which hosts two VPN networks, one is bridged and the other one is routed. See the following draft: The VPNs are working quite well while they are used in isolation. But if ...
0
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0answers
31 views

Ip6tables firewall make server unreachable on reboot

I am trying to set up a very basic firewall on my server with iptables and ip6tables. My rules get loaded on restart with systemD. The OS is ArchLinux. When I just setup iptables everything works. ...
-1
votes
1answer
51 views

How many static IP's do I need for VPN? [closed]

I am setting up a VPN system for my office. Is it correct that if I don't have a dedicated VPN server, I will need to purchase one static IP per computer I wish to connect to? Or can I just give the ...
0
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0answers
9 views

Windows printing Port monitors provide insufficient status information

When printing to a network attached (TCP/IP) printer, the Windows port monitor close the session to the printer immediately after sending the job. It only received subsequent confirmation of printer ...
0
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0answers
39 views

TCP connections drop off after initial build up

A bizarre problem on a production setup. Scenario 1) A server listens on a particular port. 2) There are potentially thousands of TCP connection requests. 3) About 200-300 TCP connections reach ...
0
votes
1answer
34 views

Managing two switches and one Router [closed]

I have the following network : One Router : CISCO 860 (In : ADSL, Out : Yellow Ethernet Cable) Two Cable Panels Rack One : PANEL 24 ports (22) - DT24F Rack Two : PANEL 24 ports (22) - DT24F ...
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votes
2answers
81 views

How are packets routed from my VirtualBox Virtual Machine to my local host OS environment? [closed]

I have a basic question I do not understand regarding the IP given to a Virtual Machine running on my laptop. I use boot2docker (basically, it creates a VirtualBox Virtual Machine to have access to ...
0
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0answers
45 views

Windows Server 2012R2 Hyper-V Additional Public IP Subnet

I am using Ubiquti Hosting for a bare metal server. The server has a base IP address space of: Main IP: 24.79.37.82 Default Gateway: 24.79.37.81 Subnet Mask: 255.255.255.248 Usable Range: ...
1
vote
0answers
28 views

Flat ISP network to MPLS dumb Q

I have a fairly flat ISP network that I am upgrading to use MPLS (dont ask why, that decision is above my position) but clients/CPE are authenticated using PPPoE. Each POP uses a router configured as ...
-1
votes
1answer
31 views

Getting Rid of the Old/Worthless Data Center Equipment [closed]

I have old and completely worthless routers/modules that are rotting in my office closet from various data center upgrades. I doubt anyone would want to buy this stuff (feel free to contact me ...
0
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0answers
22 views

IPtraf doesn't work with venet devices

I've got a VPS with Debian 7 Wheezy 64 bit. I installed the tool iptraf to monitor the network usage, but it seems that it doesn't work whit the device type "venet". So i lunched the command with the ...
1
vote
1answer
13 views

Viewing NxN network traffic in a distributed system

I have a Hadoop cluster set up, and I would like to view the network usage between all nodes in this cluster, i.e. if I have N nodes, I want to see NxN network connections so that I can view all ...
0
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0answers
20 views

Which kernel parameters should be adjusted to fix RX overruns?

I have a Centos 6 server that handles a lot of traffic. I see RX overruns increasing all the time: RX packets:11191345002 errors:0 dropped:0 overruns:35592596 frame:0 TX packets:15262461573 errors:0 ...
0
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0answers
25 views

WAMP error “took too long to respond” [duplicate]

I am hosting a WAMP server for a coworker (yes, I understand the security risks) yesterday we could connect just fine, but now we get a "sever took too long to respond" message. If I try to load the ...
0
votes
1answer
74 views

Multiple DHCP uplinks - How to ignore DNS and default route on all but one?

A multi-homed box needs more than one uplink to be configured for DHCP. It needs to ignore default-route and DNS for all but one DHCP uplink. There is a similar question here [ Debian interfaces file ...
1
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0answers
130 views

Squid intercept proxy stuck with forwarding loop

I'm trying to set up a debugging proxy using Squid, mainly to test our own client communications library for various proxy types (one possibility with our client, is to connect to an external ...
0
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0answers
21 views

Broadcast ARP weirdness

we a running a router on a custom Linux box. Kernel is 3.14.14. What happens is that when you arping the router in broadcast only mode is the router has a verey slow response time: # arping -b -c ...
0
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0answers
35 views

CORBA lookup fails with NameNotFoundException

The CORBA lookup works fine from localhost: thufir@doge:~$ thufir@doge:~$ appclient -client NetBeansProjects/corba/GreeterCorbaClient/dist/GreeterCorbaClient.jar {org.omg.CORBA.ORBInitialPort=3700, ...
2
votes
2answers
239 views

How to monitor quality of unreliable link over time?

We have ISP that provides us with a shoddy service. It usually works, but there are times when it works really bad, drops connections and gets awfully slow. Sadly, our contract doesn't have SLA clause ...
2
votes
1answer
84 views

Send network signal over a very long distance of copper

I have an issue were I need to interconnect 2 switches together. We've estimated that they are 1400 meters away (cabling distance). I wanted to use a media converter to extend the signal on OS1 ...
1
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0answers
108 views

Access to equally defined VM in different VLANs

I have a working libvirt cluster and in order to perform some paralellization I have duplicated it. At the moment my scenario looks like this: two clusters whose VM definitions are exactly the same, ...
1
vote
1answer
42 views

Port 1434 - Company Website hosting blocking us

We have a small network setup on a Windows Domain. We also have a company website that has the same domain name - but is actually not in any way on the domain - it's hosted elsewhere on a cheapo ...
1
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0answers
23 views

Stop Outbound SYN Scan

Hello I run a VPN company, and recently my host has been sending me these complaints that are likely coming from a user. I am not sure how to identify the user, if I could just do that I wouldn't ...
1
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0answers
16 views

Troubles with subnets and redirections

What I want to create is 2 subnets that communicate each other through a gateway. Here is my gateway: wlan0 Link encap:Ethernet IndirizzoHW c4:46:19:69:b7:a5 indirizzo ...
0
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2answers
48 views

Can I configure a server to use a user port(>1023) for NTP?

Can a linux server be configured to use a high source port(above 1023) for NTP synchronization with a Stratum 1/2 server? Are there any disadvantages to doing this?
0
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18 views

“Password Expired” when attempting to access Win7 machines on local network with our local admin account

Looks like all of our Win 7 and Win 8 machines were somehow set to expire the admin account that we created locally a couple months back. Now we're trying to make sure we either have to go to ...
0
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0answers
54 views

Getting chunks of high ms when pinging local / external IP addresses?

I am having difficulty identifying what a specific problem with one of your vlaned networks. They have a voip phone which regularly cuts out during long phone calls. I have done several ping tests ...
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votes
1answer
31 views

How to connect ubuntu server via SSH if networking is down

I am facing weird in my new ubuntu server set up . Actually we bought new Ubuntu server which was working fine earlier and i can ping it as well as can access via SSH. Now after running following ...
1
vote
1answer
108 views

Setup public IP address on LXC container

Can anyone tell me how to setup a network interface for each LXC container so that each container can have its own dedicated IP address? Here's what the /etc/network/interfaces file on my host node ...
1
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0answers
53 views

VMWare vSphere Distributed Switch configuration of two ESXi Host

I have two ESXi hosts (5.1 and 5.5) that I added them to a vSphere Distributed Switch. The VMs in each host can ping other VMs in the same host but cannot ping other host's VMs. All the VMs are part ...
0
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0answers
79 views

Debian 7 (Proxmox 3.4-1) Venet IPV4/6 & IPV4 Bridge

I recently have been trying to get IPV4/6 working in my openvz containers (by venet) and as of now I have got them up (through trial/error and other data sources that I dont even recall at this ...
0
votes
0answers
34 views

Incorrect real bandwidth in traffic shaping

I am trying to create a traffic shaping by HTB and iptables.I want to control bandwidth per IP so I create for each IP a class and I am using iptables marketing to assign individual filter to each ...
0
votes
1answer
89 views

Switch base connectivity between two ESXi hosts in vSphere vCenter with VDS

I have two ESXi Hosts in Hetzner datacenter and because of the Hetzner's subnet allocation policies I should have a router (implemented with CentOS) in each ESXi server to route the subnet IP to the ...
0
votes
1answer
110 views

Hyper V 2012 R2 private virtual switch with trunk and access mode switches

Is it possible, using Hyper-V 2012R2, to construct a Virtual Switch internal to Hyper-V (no external connectivity necessary or desired), where one switch participant (VM 0 in the diagram below) has a ...
0
votes
1answer
75 views

Unplug of Netgear Switch Causes Cisco Link Drop on Remote Switch

I have a very odd problem that I'm hoping someone might be able to give me even an idea of where to look. I have a new Netgear M4100-D10-POE layer 2 managed switch that we are installing in a remote ...
0
votes
1answer
57 views

Why do some network services require that the client and server be on the same subnet?

Periodically I run into client-server communication issues over a network, where the client cannot see the server, whereas other services don't have an issue. Many times, if I have to phone up support ...
0
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0answers
20 views

How can I avoid forks after a disconnection of all the peers in a unstuctured P2P network? [duplicate]

If a unstructured P2P network that uses an admission mechanism for new peers entrance gets completely offline because of a massive attack (e.g. massive DDoS), after reconnecting, peers will try to ...
0
votes
1answer
50 views

Windows Server 2008 is connected to network but Internet Explorer can't browse

I'm creating a Virtual Machine using Hyper-V with Windows Server 2008. The VM is ok, I can connect all my network and I can ping any address with success. But when I try to browse using the default ...
0
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1answer
71 views

Blocking SSH Brute force from a HAProxy LB

We're trying to grant access to an internal SSH server using a HAProxy setup on a public DMZ. This works as expected however connections into the server are originated from the HAProxy (tproxy won't ...
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votes
2answers
75 views

What happens when overloading an ethernet cable

As the title suggests, what happens when overloading an ethernet cable? Let's say, I'm using a cat5 cable and transferring 150mbit over it. What will happen? Will it slow down to something below ...
0
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0answers
52 views

Meru wireless access point to controller traffic - packet analysis

We have been having persistent issues with a laptop cart in one of our buildings. The Problem The laptop cart contains (20) Lenovo E531 (i5) laptops running Windows 7 Pro connecting to our greater ...
-3
votes
1answer
49 views

HP ProLiant DL360 Gen9 - server to server connetion [closed]

Just want to know if I can do a server to server connection via Cat6 cable for: HP ProLiant DL360 Gen9 thanks