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

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How can i detect and diagnose local network problems on a multi-server environment?

I'm a software engineer who trying to detect (and solve if possible) weird local networking problems since 2 weeks on multi-server hosting environment. We bought 3 dedicated boxes with 32GB ram 8 ...
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21 views

graceful tunnel remote change

I want to solve a networking problem: Say I have 3 machine A, B, X in a local-network, where user have access to network resource of X's network interface tunX, which is a tunneled interface connects ...
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276 views

Sonicwall NSA 2400 Not switching back to Primary VPN after Failover

We are experiencing an issue with our SonicWall NSA 2400 Firewall. We have a secondary gateway over IPSec setup in the event of a failure of our main ISP (which is unfortunately common). The ...
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808 views

ActiveMQ - “Cannot send, channel has already failed” every 2 seconds?

ActiveMQ 5.7.0 CentOS release 6.3 java version "1.6.0_26" Application server: Tomcat In the activemq.log, I'm seeing this exception every 2 seconds: 2013-11-05 13:00:52,374 | DEBUG | Transport ...
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100 views

NFSv3 Asynchronous Write Depends on Block Size?

I am trying to figure out if my NFSv3 deployment is performing SAFE asynchronous writes. I suspect that it is doing strictly synchronous writes, as I am getting poor performance in general. I used ...
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138 views

ssh hangs in Ubuntu MaaS heterogeneous cluster

I have the following issue when using ssh on my local network. I have setup a small cluster of Xeon machines using MAAS. I have installed Ubuntu Server 12.04 on all machines and configured local ...
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75 views

Is there a way to automate testing for a GNS3 network topology?

I'm working on an MPLS backbone topology using GNS3, this topology includes configuration of several networking technologies such as IPv6, BGP, OSPF, IPv6 to IPv4 dynamic tunneling, MPLS based VPNs, ...
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101 views

Apache not responding in amazon ec2

Well this might sound awkward but I facing terrible issue with my Amazon EC2 instance one of the finding I see is that apache is not responding on port 80 which is weird because I can't even find the ...
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46 views

snmpget on IPv6 local address timesout though snmpd is listening on ipv4 and ipv6

I am doing snmpget from a RHEL machine to the localhost. It works for IPv4 and doesn't work for IPv6. # snmpget -v2c -c public udp6:[::1] sysName.0 Timeout: No Response from udp6:[::1]. # snmpget ...
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68 views

Limiting users to logging onto Samba domain only from specific machines

I have Samba setup and running nicely as a primary domain controller with roaming profiles. Currently users can log on to the domain controller from any machine in the network. However, I want to ...
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53 views

BOOTP on Juniper 4200 stack works one one subnet, not another

I have a Juniper Stack that connects vlans 10,11 and 50. 10 is servers, 11 is desktops and 50 management. Bootp is redirecting DHCP requests to a AD box on 10.x just fine for 50 vlan, and worked well ...
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497 views

Losing connection to SQL Server on the same machine?

I've installed our SQL Server driven software on a client's computer. This consists of SQL Server 2008 R2 Express, and using ADO/SQLOLEDB drivers on a brand new Windows 8 64bit machine. The problem ...
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203 views

Cisco SPA504G phone CDP/LLDP issue

Good morning everyone, Just recently signed up for the site because I'm looking for some help with an issue that's been plaguing me for about a week now. I hope I'm posting in the right place. If ...
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257 views

Services binding to 127.0.0.2, not responding on 127.0.0.1

I have an OpenVZ host and running several services on it (mongodb, bitcoind). I only intend to connect to them locally. They all seem to bind to 127.0.0.2 - the venet interface. When I try to access a ...
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131 views

Ping request fails first request on one subnet/NIC. Other traffic very slow

I have a server with 2 NICs each configured on a separate subnet: NIC1 xxx.xx.151.10, mask 255.255.252.0, gateway xxx.xx.148.1 NIC2 xxx.xx.148.10, mask 255.255.255.0, gateway None, but I tried ...
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100 views

Cisco Auto Smartports on catalyst 2960-s

I have Cisco Catalyst 2960-s, I want to configure user defined macros on it. I searched a lot in Cisco documentation but its not for beginners :( How to create a user defined macro that runs when a ...
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129 views

IPsec connection established but xl2tpd times out

This may or may not be related to my problem with passing ipsec verify. I have configured L2TP/IPsec VPN on Ubuntu 13.04 following Ubuntu's community documentation and while IPsec connection seems ...
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82 views

Strange DNS behaviour over VPN

We have a small branch with few computers with few computers connected via the Internet to our central building. We don't use site-to-site, but dial-in to the Cisco router (we use ShrewSoft as a ...
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158 views

How to have JunOS to learn IPv6 default route from RA?

All is in the title, I'd like to have a JunOS learning it's IPv6 default route (and eventually addresse) from the internet connected router making RA, like an end-user computer, is this possible ? I ...
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139 views

Always get a Security Error for Internal HTTPS Website

Full disclosure, I asked this question over at Ask Different (http://apple.stackexchange.com/questions/96776/always-get-a-security-error-for-internal-https-website) but didn't get much helpful ...
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153 views

Dell PowerConnect SNMP stack member monitoring

I am looking to monitor a stack of Dell PowerConnect 6248p switches via SNMP. There is a stack of 3 switches that I want to monitor. Due to the stack being 1 logical unit it only has 1 IP, so when ...
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231 views

Windows 2012 to HP Procurve redundancy across multiple switches - multi-switch LACP?

We are looking to have our Windows 2012 server(s) connected to two separate switches, so that if one switch goes down the server(s) can still be accessed on the same IP address from the switch that is ...
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58 views

Can you SNMP poll the ARP table on Cisco ACE?

I'm trying to get a MAC <=> IP mapping from a Cisco ACE. Unfortunately according to this table, while it supports IP-MIB the ipNetToMediaTable and ipNetToPhysicalTable subtrees are not supported. ...
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95 views

Why might one host be unable to access the Internet, when it can ping the router and when all other hosts can?

I have a Draytek Vigor 2830n. It's kicking out a 192.168.3.0 LAN. It performs load-balancing across dual-WAN ports, although I've turned off the second WAN to simplify testing. There are many hosts ...
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112 views

How do I completely remove VirtualBox from Server 2008 R2

I'm having network problems since I installed VirtualBox on a Windows Server 2008 R2 64 bits machine. I tested with iperf and the speed suddenly goes to zero for a couple of seconds once every 1 to 3 ...
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33 views

Server dropping all clients at intervals

I administrate large-scale servers for Minecraft: Pocket Edition. For the past couple of months, I have had the issue where at intervals the server will close all active connections to it (VNC and ...
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53 views

IIS6 poor throughput from higher latency

I've been having a crazy issue with Windows 2003 + II6 where the throughput goes down as the latency goes up. This is exactly the type of thing that TCP Window scaling is supposed to solve so I ...
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44 views

Preventing Python as a gateway to CMD for Standard Users

Someone has hacked our system - using Python as a gateway to open command prompt as an admin - and the hacker shuts down computers remotely using shutdown /i. How can we prevent this using Group ...
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54 views

802.11n router supporting 802.11n as WAN connection?

I have an existing 802.11n WLAN router with an Ethernet connection as its upstream WAN connection (router A). I would like to get another 802.11n WLAN router (router B) and have it use router A as ...
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80 views

Smartphone conflicting with LAN?

Recently, I've been having sporadic problems with internet connection on some computers. It turns out that an IPhone, when connected to the wlan, was causing this. These computers with Internet ...
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124 views

linux kernel configuration to filter multicast traffic based on interface

I have two virtual interfaces (eth0.2, eth0.3) in my PC. I am sending multicast data from eth0.2 to eth0.2. Multicast data is received in eth0.2 but also received in eth0.3, the other virtual ...
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179 views

OpenStack Server Instances have internet access, but they are unable to access the internal network

I'm running an OpenStack Grizzly release with a Nova-Network configuration. [No Quantium]. My network is setup as follows: OpenStack Box (10.10.13.xx network)->OpenStack Internal Network ...
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378 views

Windows Filtering Platform blocking packets for legitimate traffic

I am running into an issue with traffic from a webapp server to a database server being blocked or filtered. I have allowed inbound and outbound traffic on the needed ip and port with a firewall rule, ...
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138 views

Receive errors counter in /proc/pid/net/dev

Can anyone explain what gets reported in /proc/pid/net/dev in the receive "errs" column: $ cat /proc/1372/net/dev Inter-| Receive | Transmit face ...
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429 views

NAT Pooling with IPSEC source int on Fortinet 60c

I've been working on this one for a while, and been trying to figgure it out but now I've been banging my head against the wall.. We have the following setup: Fortinet 60c configured with these ...
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48 views

Nat Traversal, peers unable to communicate

I'm currently working on a project that requires NAT traversal but I seem to be running into difficulty. I have the following setup running for testing: R1, Verizon Fios router connected to the ...
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82 views

How can I set ntop not to shorten host names?

With most screens in ntop, there is a list of hosts. Unfortunately, in almost every one, the host name is shorted, for some reason. When the host names follow the company standard, this results in the ...
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485 views

Apache Server Error The specified network name is no longer available. : winnt_accept: Asynchronous AcceptEx failed

We are facing the following issue on our apache server: [Sun Apr 14 10:33:26 2013] [warn] (OS 64)The specified network name is no longer available. : winnt_accept: Asynchronous AcceptEx failed This ...
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101 views

Broadcast across a VDE switch

I created a simple VDE Switch as per: http://stackoverflow.com/questions/2082722/how-do-i-create-virtual-ethernet-devices-in-linux To paraphrase that question, the setup is: sudo vde_switch -tap ...
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396 views

Ghost “vlan 0” tags added to ethernet frames in CentOS guest under OpenStack

I'm trying to debug an issue involving a KVM virtual machine instance where the instance doesn't respond to network requests when the source is on another physical machine, which is on the same subnet ...
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2k views

Windows 8 wifi problems with certain WAPs?

There seems to be a problem with Windows 8 wifi drivers working with specific WAPs. I have a Windows 8 ultrabook that works famously on my wifi network at home. When I take it to work (yeah we're ...
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108 views

Network ping responses with very large times and other weirdness

I've been having a problem with a computer on a remote network and have been trying to figure out why it keeps having network issues (I would normally try to be on-site, but I am temporarily unable to ...
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274 views

keepalived config is not working correctly with virtualbox vms

my keepalived configuration is not working correctly. I have two virtual testing machines (virtualbox) to try some things out with keepalived/vrrp. Bot can ping each other flawlessly (internal ...
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300 views

Apache slow upload speeds

Hey I'm running a Windows Virtual machine with virtualbox inside of an ubuntu dedicated server, I ran a speed test at speedtest.net and it returned 74MB/s download and 44 MB/s Upload speed on the ...
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192 views

OpenVPN: Run 'bridge-start' on boot before starting openvpn service (Ubuntu)

I've got OpenVPN working properly on my server, using bridge-start and bridge-stop scripts to create and remove network bridge, respectively. How do I set these scripts up to run bridge-start at boot ...
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134 views

Virtualbox: Bridging Guest VPN within a Bridged Connection

I've been trying to figure this out for a few days. Perhaps the biggest problem with figuring out the answer is that there are no unique keywords that I can think of to explain the issue. I have ...
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217 views

Load Balancing Ethernet LAN & WIFI on linux?

I have configured two internet connection to my Linux box, first Ethernet LAN with range 192.168.2.1 & WIFI with range 192.168.1.1 this both connection are connected to 2 different internet ...
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214 views

Cannot ping any machine on local network (embedded linux device)

I have an embedded linux installation (custom built using buildroot, uClibc and busybox) and I am unable to ping any machine on my local network. My /etc/network/interfaces file is as follows auto lo ...
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97 views

Is the Foundry BR-FGS624P switch stackable by adding the 10GbE ports, or is it never stackable?

I'm looking at buying a Foundary BR-FGS624P 24 port switch which will suit our purposes now, but thinking into the future I might like to stack the switch when we add a few more servers to our rack. ...
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37 views

Java BindExceptions in delayed stop/start conditions

I have a script that will automatically stop a server and restart it on the same port/ip address. I've noticed that some mornings the server doesn't restart successfully because it gets Java ...