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
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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
42 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: ...
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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 ...
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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
21 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
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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 ...
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0answers
19 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 ...
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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
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1answer
67 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
120 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
20 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 ...
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0answers
29 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
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2answers
238 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
103 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
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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
22 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 ...
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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
46 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?
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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
50 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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1answer
30 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 ...
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1answer
92 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
51 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
76 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 ...
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0answers
33 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
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1answer
86 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
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1answer
107 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
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1answer
74 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
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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 ...
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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
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1answer
49 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
66 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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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 ...
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0answers
47 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 ...
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1answer
46 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
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0answers
22 views

Lost network connectivity after a “yum -y update”

I've a server on Centos 6.5 and after a yum -y update we've lost all connectivity on it, the only access we have is on shell thru SolusVM serial console, I've tried everything (SFTP, SCP) on my reach ...
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0answers
32 views

Windows 2012 Server r2 dont let me install a Custom Service

I need install a custom service on Microsoft Windows 2012 r2 64-bits, but the system says "it's all ready install" (when I try to install it) or "service not found" (when I try to uninstall). What ...
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0answers
30 views

Diagnosing a 2-minute delay in HTTP GET request

Under narrow circumstances, I get a 100% reproducible delay of approximately 2 minutes when I request a public web page. The page in question: https://id.openjdk.java.net/console/login Splicing ...
0
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1answer
23 views

multi-master databases in low connectivity environments

I'm working on a project that has many client devices distributed in remote environments where connectivity losses are frequent and expected. Clients continue to operate when offline, but when these ...
0
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3answers
57 views

Server talks to one group but not other, both groups talk to each other

I've been trying to figure this out for a couple of days now and no luck so I thought I'd ask here. We have two buildings connected via a line of sight wireless network bridge. We have two routers, ...
1
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1answer
90 views

Why some iptables DNAT rules don't work until reboot?

My iptables DNAT rules don't work until reboot. If I reboot my server, all of the rules work. Desciption of the architecture : Tens of hosts (senders) send some UDP packets (one-way on a specific ...
0
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1answer
27 views

Changing Azure VM networking settings

This is probably a stupid question but I am going to ask anyway. I have a VM running on Azure. I go into network connections and change the IP and gateway and I loose connection. What options do I ...
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0answers
31 views

How to correctly setup multiple IP addresses pointing to one instance in EC2?

I currently have one ec2 instance which I'd like to have 2 public IPs pointing to. I have 2 EIPs allocated, 2 network interfaces to which the EIPs are attached and which are both attached to the ...
0
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1answer
37 views

iptables ipset misconfiguration?

I'm looking for a solid method to block unwanted TCP/IP traffic. On my linux machine iptables and ipset seem to offer a nice way to do so. Until now I've done this: ipset create ipsok hash:net ...
1
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1answer
69 views

dhclient.conf missed on centos

on centos 6 I need take the values from a dhcp server: cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=00:50:56:27:0E:C8 TYPE=Ethernet UUID=20924b21-e92a-4944-a054-06d1967155c1 ...
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1answer
50 views

how to connect 2 networks with different routers

I have a TP-Link TL-ER6120 VPN router and a Cisco RV-180 VPN router. I want to have 2 networks with two routers connecting each other. My network is the following: Internet -----> TL-ER6120 ...
0
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2answers
44 views

Is there a way to query all the mac addresses in a network?

I know this question was flagged "off-topic" and "non-professional", but when creating a gateway or IDS, this might be quite relevant. Also, Google finds nothing usable... There is a thing called ...
0
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1answer
46 views

Clients connected to “vlan hub” can't access internet on dedicated, natted vlan

I'm trying to get my network up and running with my new provider's vdsl router, which can't operate in "modem-mode" or "bridge-mode". My setup so far is as follows: I have two managed switches, ...
0
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1answer
32 views

How to tell what is blocking internet (download) on cloud server

Background: My employer is using a cloud-based database server through a service called Rackspace. This server is accessed by our other servers via ssh. Our network admins are unreachable for the next ...