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

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606 views

VirtualBox VM network hangs due to ethernet “Reset adapter”

I have a VM which I've created on a host using the following settings: http://pastebin.com/raw.php?i=sevF5V7Z It has been up and running smoothly for months but recently the VM lost connection with ...
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1answer
2k views

Cannot connect to Openstack Instance via horizon, but SSH works?

I've got an OpenStack deployment running inside a VM for testing purposes. My setup is as follows: Host Ubuntu x64 with Virtualbox -> Guest Ubuntu x64 with OpenStack -> Ubuntu X64 Server Test ...
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1answer
18 views

Installed a new Sonicwall at MPLS provider's DC, got it working by luck but have no idea WHY it's working like this

I'm nervous leaving the device like this because it makes no sense to me WHY it's working like this. We put in the new Sonicwall to replace an older Cisco ASA. Just did the basic setup, using same ...
2
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1answer
18 views

snort: drop icmp rule doesn't actually drop packets

I installed snort-2.9.7 from sources, and launch as IDS: % snort -devQ -A console -c /etc/snort/snort.conf -i eth0:eth1 Enabling inline operation Running in IDS mode ... The config file is very ...
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1answer
39 views

firewalld vs iptables - when to use which

TL;DR On new CentOS server installs should I be using firewalld or just disable that and go back to using /etc/sysconfig/iptables ? firewalld and iptables serve similar purposes. Both do packet ...
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1answer
15 views

How to remove crypto-ransomware on my network domain

Today some computer on my domain got infected with crypto-ransomware and have infected some folders on file server that only some computers on network have access to. So I presume one or more of five ...
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0answers
25 views

Lan to internet ipv6

I have 2 iface Lan and Internet with only One Ipv6. Over my lan I have a DHCP and DNS server ready for IPv6 support (I use DNSMasq). I'm On OpenVz CT but i can play with kernel module. I use ...
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0answers
13 views

No connectivity between azure VMs

In my azure environment, I have 4 VMsx running Windows Server 2012 R2 10.0.0.4 (AD, DNS) 10.0.0.5 (ADFS) 10.0.0.6 (MSSQLSERVER) 10.0.0.7 (IIS) All of the machines are connected by an azure virtual ...
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1answer
17 views

Need advices on iptables

Helly guys ! :-) . I need a (several?) advice(s) from you about my iptables setup. I'm pretty new to iptables, and this is the first time I configure a server with iptables ONLY as a firewall (we ...
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2answers
46 views

IP Address reassignation (unused Ip address)

Available IPv4 address blocks are exhausted and price per IPv4 address is increasing. However I read that 2/3 of IP address remains unused because they were assigned improperly at first stages. Since ...
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1answer
12 views

Access Point config through static IP

My school have LAN cable for every dorm room, Computer want to access to inter net must set static IP and DNS. Mine as follow: IP: 10.107.31.99 Sub: 255.255.255.0 Gateway: 10.107.30.1 DNS: ...
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1answer
990 views

Redirect some specific traffic to a different gateway

I have two gateways with different ISP, one of them defined as default for the LAN user and the other ISP used as the default for the Servers and VPN traffic. This is done using regular routing tables ...
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4answers
147 views

Replacing 100 MB Network Hub with a Gigabit Switch [on hold]

Our current network setup is a modem within the ONT box from Verizon FiOS which has 29 static IP addresses. We get 165 Mb per second from Verizon... This is connected to a Netgear 100 Mbps hub. This ...
2
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2answers
61 views

Rack Server Width

I am dabbling into the world of rack servers and trying to teach myself a thing or two. I have come to a roadblock about the width of a rack server, I have read that the standard width for a rack ...
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2answers
3k views

Unable to connect via NetBIOS Name

I can't connect to machines/shares by NetBIOS names. Below is console output showing the problem. C:\>nbtstat -n Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] ...
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0answers
23 views

VLAN configuration on HP J9279A

I've tried to set up separate VLAN for lab environment on one of my HP switches (J9279A/J9280A). Network schema: WAN | GW | ...
0
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1answer
18 views

Watchguard Mobile VPN with SSL - user can't connect - failed to open shared memory for openvpn command (error: 2)

I have a problem with my Watchguard VPN. I've set up the device for SSLVPN (added policies, users, a group etc.) according to this description from the Watchguard docs. The authentication itself ...
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2answers
7k views

All connections from this network get stuck in SYN_RECV state, connections from my home or phone properly get ESTABLISHED

My server (a linode VPS) suddenly started to timeout on every request yesterday. I'm pretty inexperienced in networking and would love to learn a process for debugging these connectivity issues. ...
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1answer
129 views

Plesk 11 / Cents5, how do IP's on multiple ranges work [on hold]

I have a plesk 11 setup running centos5 and i'm a little confused by something. On the server I have 2 ips from 2 different ranges. They are public IP's pingable from the outside world and working ...
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0answers
16 views

Persistent error when installing windows server essentials in windows server 2012

I'm getting an error when trying to perform post installation configuration of windows server essentials in windows server 2012: An error occurred when installing Windows server essentials. Please try ...
0
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1answer
20 views

What exactly happens to packets written to a TUN/TAP device?

I'm trying to send packets to an application listening on eth0 from machine's user-space as if they were coming from a remote machine. What I can't seem to find good documentation for is the exact ...
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1answer
32 views

Routing on outgoing data packet in linux kernel? [on hold]

I am currently studying iptables. So far all the articles and howtos I have found on google/duckduckgo has only ever mentioned routing on incoming packets (passing the INPUT och FORWARD chain). I find ...
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3answers
206 views

Send TCP/IP packets down three routes and pick fastest

Does there exist a way to split TCP/IP traffic across three routes and have the first packets to reach the destination be used? I'm imagining something like multi-homing but with the requirement that ...
-1
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0answers
11 views

Fastest link between two TP-Link JetStream TL-SG3424P Switches [on hold]

I have 2 of these situated approximately 25 meters apart - what's the most performant method of connecting them together - straight CAT 6 or utilising the SFP ports?
3
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5answers
18k views

Ubuntu Server 12.04 can access LAN but not internet

Using Ubuntu Server (12.04) via command line, I can access the LAN (e.g. ping local machines) but not the internet (e.g. "ping google.com" or "sudo apt-get update"). How should I troubleshoot this? ...
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1answer
83 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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1answer
48 views

iptables and routing mechanics [on hold]

At what stages of handling a data packet does the linux kernel apply the different iptables chains and routing? I am looking for a schematic overview of the process.
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2answers
81 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 ...
2
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2answers
1k views

IP Conflicts from mikrotik router for multiple ip addresses (that it isnt assigned)

I have a point to point wireless connection using two mikrotiks. When I plug the mikrotik into a switch with just my laptop I get an IP address conflict on my machine no matter what IP I am assigned. ...
0
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2answers
827 views

How to share Internet connection with Ubuntu Virtual Machine?

I have Windows Server 2008 R2 as host and Installed Ubuntu 11.04 as Virtual Machine using Virtual Box. My proxy is configured using URL. I tried configuring in the networking settings and also with ...
0
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1answer
21 views

What is the purpose of the apache address binding?

Apache virtual host configuration files are wrapped in a container like so: <VirtualHost *:80> # # Virtual host config etc... # </VirtualHost> Where the * represents the ...
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2answers
12k views

Fortigate 200A firewall CPU high resource usage

This morning I'm receiving complaints from several end users that saying their whole department network are slow and have intermittent. Therefore I've checked our firewall to see whether if something ...
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0answers
24 views

Limited Connection - Network Issue

I'm having issues with a Windows Server 2012 - Dell PowerEdge R300. Every time the server restarts the network adapter gets limited connection and does not work. I have to locally disable the network ...
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0answers
37 views

Connect AWS and Azure via OpenVPN

I am trying to connect two networks (AWS and Azure) together via OpenVPN. I am aware of other implementations (OpenSwan+Azure GW etc.) but I need maximal portability as I will be expanding this to ...
4
votes
1answer
54 views

Open Source Puppet for Network Devices

I'm attempting to determine whether I'd be able to run Puppet on network devices (switches, firewalls etc.). From what I can tell after reading online documentation, Puppet Enterprise will cater such ...
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0answers
5 views

Accessing localhost over WiFi by name [migrated]

This is my configuration: 1. Ubuntu 14.04 LAMPP server (localhost). 2. WiFi Access Point on ubuntu server. 3. Android device connected to WiFi access point. I can access localhost from android device ...
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1answer
10 views

AD Dynamic DNS not working with Linux IPv6

I have an AD DNS/DHCP enabled server. I have mixed Windows and Linux machines/servers. IPv4 is working great with DNS/DHCP, even for the Linux systems. IPv6 is working great except that it won't ...
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0answers
19 views

VirtualBox: How to set up networking so guest can host servers [on hold]

So i have problem with VirtualBox. My host is windows 7 x64 and on guest i tried linux ubuntu server and same windows 7 as host. internet is working fine and in my router i can see guest machine, but ...
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2answers
1k views

Network connection to Firebird 2.1 became slow after upgrading to Ubuntu 10.04

We've got a setup that we're using for different clients : a program connecting to a Firebird server on a local network. So far we mostly used 32bit processors running Ubuntu LTS (recently upgraded ...
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2answers
52 views

Get a website's host machine's OS/server software without access to the server

Is there a good methodology to find the operating system and server software that is being used on a served website that you don't have SSH access to? What I'm doing right now is looking at TCP/IP ...
3
votes
10answers
8k views

Use first or last free IP for the default gateway?

Please assume a simple LAN on 192.168.100.0/24. Would you configure the default router on 192.168.100.1 or 192.168.100.254 and why? Thanks
1
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1answer
816 views

Broadcasts from guest machine not reached host machine

I have an application that sends UDP broadcasts to some port, for example 11000 (BROADCAST_APP) and another application that listens the 11000 UDP port(LISTENER_APP). The apps works well on the ...
0
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1answer
35 views

Performance Implications to Using a Full Class A Subnet

Let's say you have a small network (50-60 IPs) and assign everything a 10.x.x.x IP with a subnet of 255.0.0.0. This gives you a huge range of usable IPs. What performance implications will this have ...
1
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3answers
888 views

How to make same server IP accessible from multiple interfaces that are not bridged on Windows 2008 R2?

My server have two interfaces (e.g. A, B) that are not bridged. These interfaces have different IP adresses (e.g. 192.168.1.1, 10.0.0.1). These IP addresses are in different subnets. I need to ...
0
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1answer
3k views

PXE boot with Virtualbox

I have a linux guest and that is my server. I also have created another guest as the client with no disk. I want to know, which network type and adapter is correct? NAT or Internal Network? AMD or ...
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1answer
990 views

IP setting in CentoOS 6.2x64 by XenCenter 6.2

I have setup a Guest CentOS virtual machine in Xenserver.. I have updated the Xentools but i cannot find the option to config my IP Address which is showing to be 'unknown' currently. All i need to do ...
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0answers
16 views

Extreme latency establishing MySQL and SSH connections host->guest using Virtualbox on OSX 10.10 [on hold]

Running the latest version of VirtualBox on OSX 10.10 (Yosemite). Connections to services running on a Ubuntu 14.04 guest are extremely slow, regardless of VirtualBox networking configuration. I'm ...
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0answers
532 views

Route two public (ISP assigned) subnets on 'outside' interface of Cisco ASA 5510

We've got a Cisco ASA 5510 that sits on our edge and acts as the PPPoE endpoint for a fibre connection. The fibre connection came with a static IP, which is assigned via PPPoE, and gets picked up by ...
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0answers
57 views

Receive many UDP packets & ksoftirqd load

I want my server to be able to handle more than 1Mpps from a 10g card. Is it possible? I have Ubuntu 14.04 with kernel 3.11 and a 16 core Xeon machine. It seems that ksoftirqd becomes bottleneck in ...
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0answers
35 views

Connect DOS 6.22 Client to Wireless router USB Shared Drive

We have a DOS 6.22 client OS currently configured as NETBEUI. We would like to know if there are any wireless routers with a USB shared port for sharing files, that will allow a DOS 6.22 client to ...