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

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IPv6 and AdvManagedFlag

RA messages have AdvManagedFlag. If this flag is ON then host "should use stateful autoconfiguration to obtain addresses" (RFC 2462). But RA messages are processing by the kernel. How do we know that ...
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17 views

WFS/NFS Shares lagging then crashing client machines

We're running a Windows domain (2008 R2 on 2 DC's) with a Synology Rackstation hooked up with all our shares on. We have about ~100 workstations and 30 phones hooked up to the domain (the phones have ...
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35 views

Linux MIPS box: ICMP (ping) works, but TCP does not - how to fix it?

I'm trying to set up MIPS Linux box network. Here is it's configuration: ~ # ifconfig eth0 Link encap:Ethernet HWaddr CC:5D:4E:FF:45:7F inet addr:192.168.0.2 Bcast:192.168.0.255 ...
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26 views

OpenVPN running on Internet Gateway, so all private clients can access VPN with no config

Our LAN connects to our office gateway machine (192.168.1.1), which is connected to the Internet. I have setup NAT/Masquerading for this purpose with no issue. We also use OpenVPN to connect to our ...
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18 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 ...
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74 views

Unidentified Network for HyperV Internal Switch

I am trying to setup a HyperV internal switch for the guest OS on a Windows Server 2012 host. After creating the new Internal Switch through Virtual Switch Manager, I can see the virtual adapter under ...
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24 views

cascading additional switches good or run wire directly from main switch

We have a network design as shown below. Now my concern is if the additional switches are affecting our network throughput or latency or causing any network collisions. If I run directly 21 lines from ...
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41 views

What could be the cause for outbound TCP/IP traffic beeing blocked while ICMP is still working?

On a Windows Server 2003 there is a strange issue. Every 6 hours the server don't accept outbound TCP/IP traffic while inbound traffic working fine. If the problem occurs I can connect with RDP to ...
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24 views

Server network communication stalls

I'm running SBS 2008 as a file server, SQL server, IIS7 Server, and Exchange server, and very recently I am getting some very confusing stalls on it. During these "stalls," file services will cause ...
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62 views

Bonding more than 2 nics causes connection drops

I'm running CentOS 6.5. I have 3 servers with quad 1Gb nics. I'm using bonding mode 6 (tried 0 as well) running through a cisco 4948 switch. When only two network cables are attached, no issues. If ...
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65 views

Connection two subnets behind routers

Task is very peculiar. I ask your help. Do you have any ideas on this subject. We have: 1.First device: |Internet| -> |ASUS RT-N16(firmware dd-wrt) 1| -> |Server base on Ubuntu 1| 2.Second device: ...
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46 views

Accurate modeling with the psping -l parameter?

I'm in the process of setting up a psping job to allow me to test the performance of some new network based applications in my environment. I'm a little hung up on the -l argument for specifying the ...
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43 views

Separating Secure Network and DMZ (nonsecure) in a PCI Compliant Infrastructure

We are setting up a PCI Compliant infrastructure where most of our applications are running in a DMZ (demilitarised zone) that contain no sensitive information. The part that contains sensitive ...
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63 views

Inter-server connectivity loss after applying cisco switch configurations

I have 2 Redhat servers in cluster. The eth0/eth2 ports on both servers are in bond0(which is assigned IP). The eth0 and eth2 from server1 are physically connected to giE0/3 on switch1 and 2 ...
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30 views

SolusVM Ubuntu 13.10 OpenVZ networking issue/bug

I currently have a server running SolusVM and using OpenVZ virtualization. I downloaded the new Ubuntu 13.10 from their official repo http://openvz.org/Download/template/precreated and installed it on ...
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55 views

Ipv6 configuration in VPS Server

Currently I have a VPS where I use different ips as interfaces, like curl google.com --ipv4 --interfaces venet0:1 The vps has ipv4 and some ipv6. Usually the vps are managed with OpenVZ, Xen, or any ...
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13 views

Routing table taking long time to update for adhoc networks and OLSR

I am using OLSR to implement adhoc network and analyse the throughput.I have olsr working on 3 interconnected computers on adhoc network. I am using jperf to simulate and visualise the data ...
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42 views

Pass a traffic from a specific domain through OpenVPN

I want to pass traffic from a specific domain through openvpn (tun0) and the rest through eth0 How can I configure openvpn to work with eth0? the domain name is set with ddclient to update dynamic ...
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75 views

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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20 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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63 views

Debug: Cisco VPN Router runs 100% CPU

I've turned logging on and all I am currently getting are Debug/Kernel logs. Nothing above debug. This was also during offsite hours when hardly any traffic was going on. I have also upgraded to the ...
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90 views

How to make Statsd talk to Ganglia on EC2 (localhost)

As per topic, Im just trying to make this simple setup work. The services are running fine, but as far as I can tell statsd doesn't send anything over to ganglia. Ganglia is working fine I guess since ...
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146 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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303 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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64 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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80 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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60 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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64 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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32 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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101 views

Should I set rto_min for a route inside data center?

We have a few dedicated server rented in a data center with debian 7, kernel 3.2. We use one of those servers as a database server. The network between our application server and database server is ...
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43 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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40 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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125 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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129 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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127 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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71 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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67 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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116 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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67 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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144 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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63 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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111 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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179 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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49 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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83 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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218 views

Unable to ping gateway via bridge nic

I'm trying to install KVM on Ubuntu 12.04 server. We have multiple nic on this server of which we primarily use eth0. The server network runs fine(i'm able to ping gateway, ping dns server and ping ...
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87 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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29 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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40 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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37 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 ...