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

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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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62 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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103 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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142 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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34 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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57 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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47 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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82 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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152 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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199 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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446 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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162 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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508 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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51 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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96 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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647 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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126 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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456 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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122 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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348 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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250 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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167 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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263 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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336 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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105 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 ...
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334 views

UDP Range Nat Translation port forwarding RPT Traffic to inside host PBX Cisco ASA 5505 8.2a

I have an Asterisk based PBX that I'm providing VoIP services with, My gateway is a Cisco ASA 5505 running 8.2 and I only have one public IP Available along with other services I provide with that IP. ...
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737 views

Network topology change every 2 seconds

I'm having some weird troubles with our smb network. There isn't any documentation about the structure/devices or which cable is attached to which wall socked and I'm discovering lots of weird stuff. ...
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545 views

IIS Webserver failing to send a FIN/ACK

I have a Windows Server 2008 R2 SP1 box with IIS 7.5.7600.16385 installed. I have HTTP Keep-Alives switched off. Each time a web-request is made the connection is terminated. I get the following ...
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255 views

Network latency in Ubuntu 12.04 LTS

Until recently, my internet connection on my Ubuntu machine was working fine. Then, seemingly out of nowhere, I'm finding severe latency problems. For instance, in my web browser, I'll attempt to ...
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77 views

Adding a Cisco RV084 appliance for site-to-site services in a local area network that I can't change

I have a need to establish a site-to-site vpn connection to a remote office using a Cisco RV084 appliance. We currently are in a shared office environment where our property manager has provided us ...
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110 views

Trying to get an SVN running on a VM using a bridged connection and accessed from WAN using a DDNS

I am trying to get an SVN to run from a Windows 8 VM and accessed from a distant computer via WAN. I am using a VMWare Workstation 9 for the VM and the host is Windos 8 and the guest is Windows 8 ...
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419 views

PPTP won't connect error 628

vim /etc/ppp/chap-secrets # Secrets for authentication using CHAP # client server secret IP addresses #* pptpd 34fg3g93jgij3g * and vim /etc/radiusclient/servers ...
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1k views

Unable to ping multicast IP

Let me prefix this by saying I'm not entirely clear on how multicast works. I have the gist of it, but not the underlying functionality. A customer has configured a RHEL6 cluster between two Jboss ...
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277 views

After add the Cisco ASA5550, my server can't access the internet

Here is my network infrastructure. there is a problem in my network. server M,A,B,C,D have public ip address. people who are outside of my network can ping server M at anywhere, but they can't ...
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185 views

Samba is faster than NFS when accessing from Mac, any reason

Refer to this question (closed): Sharing folder from Linux to Mac, Samba or NFS?, most people suggested that NFS is faster and therefore I did a quick test: MacBook Pro / OSX Lion Ubuntu 12.04 ...
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423 views

Set up LXC container as VM with its own IP address

I need to set up a fenced environment in on Ubuntu server. The actual use case is to have two separate websites running on the same physical box, but I want one of those websites running in a fenced ...
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146 views

Peer to peer ipsec tunnel - virtual network interface

I'm trying to create an IPSEC tunnel between two machines (not between two networks). Using ipsec-tools, TUNNEL mode. I think I can cope with all those add and spdadd, but how to create a virtual ...
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65 views

% segments retransmitted above threshold

I've been doing some monitoring on our servers and we get warnings that the TCPv4 / % Segments Retransmitted is above acceptable threshold: http://imgur.com/b8RNm Is there any way to tell what the ...
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137 views

SMC Tigerswitch and HP Procurve wouldn't connect with fiber

the first thing that I don't understand is why the SMC switch considers the pair of single mode fibers as one port,one link, but the HP switch sees the two fibers as two ports. when I wanted to ...
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241 views

Conigure Linux server to do lawful interception

I have a server that makes the routing for my LAN (Linux, CentOS). I would like to have on it the possibility of lawful interception: I want to be able to see all network traffic that was done from my ...
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8 views

Server 2008 R2 no networkcenter

We have a problem with our server 2008 R2. When we start up we can't start the network center for the settings. We can't log in with the external Remote Desktop. If we startup in safe mode we can ...
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110 views

Changing externally visible IP on a multi-IP router?

I work at a public library and I'm trying to configure OCLC's EzProxy software. I've run into a problem and I think it's related to our network config. I'm punching above my weight here a little so ...
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38 views

Custom incremental update in Windows

Our client has 100+ computer in the network and they are switching to Windows 7 next month. Our software is based on SQL 2008 and .NET 1.1 binaries. They requirement is to create an incremental ...
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179 views

Netlink error while using IP queue

I seem to have an issue with IP queue. I have a linux machine that I am using to run some experiments. The linux machine is configured to be a router, having two NICs, connecting two other computers, ...
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118 views

What is the meaning of the QUEUE in arptables

I use the nfqueue target of iptables in order to get packet to the nfqueue and do some business rules on them. iptables -A INPUT -p tcp -j NFQUEUE --queue-num 0 I need to do the same on arp reply ...
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479 views

Access All VLANS over XenServer Interface

For my current setup, I have a physical NIC on a XenServer machine that receives traffic tagged with various VLAN IDs. I have a virtual machine that is running Vyatta that needs to be able to access ...
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87 views

Datacenter redundant hosting setup advice

We are moving our servers to a new DC and I am looking for a bit of advice with our new COLO setup. I have some knowledge of networking but I am an enthusiast more than anything so it gets a bit ...