Added a switch & killed my network

Good day, my router, (NewerTechnology MaxPower 802.11n/g/b) has been working flawlessly for years, but Im running out of ports so I decided to add a switch (D-Link 10/100 8 port, model DES1008E) and once I did that my network died. Trying to connect to router through airport just gives me the dreaded self assigned IP address, same thing with a direct ethernet cable connection. I'm writing this by a direct hook up to the modem, bypassing the router.
I have reinstalled SL to no avail, I've reset the router, I've made Network Preferences forget my network and then relearn it, I've done manual IP config and so far nothing has been completely successful. I've noticed that when I first start computer, internet connection does occur after 5 minuets of sitting, but I can't access my router thru 192.168.1.1, and after an hour or 2 I lose connection. All my attempts at correcting the issue, including weeping uncontrollably, have failed. Any thought or ideas on correcting the issue would be appreciated and secondly, if anyone knows how this happened that would be nice too.

You have a modem, a router and now a switch? If you have connected the switch to the router correctly the connection should have been transparent. Usually the devices have an ethernet port which is designated Uplink, for use with another routing device as opposed to a computer or other device.
Ideally before connecting the devices together, set each one back to its factory preset. There should be a rest button on each device to do this. (Check in the user guide that came with each device.) Then, with all devices powered off, connect any ethernet port on the modem with a standard ethernet cable to the ethernet port on the router designated Uplink and then connect any ethernet port on the router with a standard ethernet cable to the port on the switch designated Uplink. Then turn on the devices one at a time about three to five minutes apart, starting with the modem. The factory preset should allow each device to properly negotiate a connection with each next device lower in the chain.
You should then be able to connect your iMac to the router or to the switch with an ethernet cable and with Sys Prefs/Network/Ethernet on the Mac configured with DHCP or to the router by wi-fi with the Mac configured in Sys Prefs/Network/Airport with DHCP.
Dah•veed

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hi all,
if I connect new switch to my network, can I let Cisco PI to apply a specific template of configuration to this switch automatically?
how can I do that ?
thanks in advance

Hi,
i followed these steps :
SWITCH SIDE
- configured Prime Infrastructure as snmp-server host;
- enabled snmp-traps for linkup and linkdown events globally;
- disabled snmp-traps for linkup and linkdown on non relevant interfaces using the no snmp trap link-status command
PRIME INFRASTRUCTURE SIDE
- under "Deploy/Monitor Deployment" i deployed template "Interface Health" for all the interested switches
- under "Administration/System Settings/Mail Server Configuration" configured my internal SMTP server to make Prime Infrastructure able to send e-mails
- under "Operate/Alarms & Events" click on "Email Notifications" , then on "Switches and Hubs"
- check the "critical" box , insert the destination e-mail address into the "To" field then click "Save"
- check the "switches and Hubs" box and then click Save
As i know is possible to avoid to configure every single not-interesting port on the switches with "no snmp trap link-status" command (it's a bit annoying when you have tens of switches), using Port Grouping configuration on PI but i tried it without success.
Hope this helps.
Best Regards,

Itunes 6.0.1.3 is killing my network!

The last time I updated all my podcasts was 12-8-5. I had not run Itunes since then. I fired it up this past weekend and something really strange happened.
It was unable to update any podcasts. Also, my laptop had disconnected from my wireless network. I closed Itunes but my system still was unable to see any wireless network. I rebooted and was able to connect again. I then left the wireless properties open and started Itunes. My wireless connection began to drop in speed over the course of 1 minute from 54 -> 36 -> 24 -> 11 -> 1 -> 0 Mbps when it again disconnected and would not see wireless. I rebooted and started all over again. This time I closed Itunes before it killed the connection and within 1 minute my speed is back up to 54 Mbps.
This is also happening on my hardwired Desktop! As soon as I fire up Itunes, the lights on my switch and router and every AP start flashing like crazy! I am talking about three switches and a wireless bridge. The activity lights on all devices go crazy until I kill Itunes on my desktop. As soon as I do, the activity stops, but I am forced to reboot all my network devices to get the network up again.
No, I am not the only person in the world seeing this behavior. I just listened to Leo Laporte's KFI Tech Guy podcast from the first week of December and a caller was describing the exact same issue:
http://leoville.tv/radio/ShowNotes/Show201#toc3
I have also found another reference to the same thing here:
http://forums.macnn.com/archive/index.php/t-246946.html
And another here:
http://groups.google.com/group/microsoft.public.windowsxp.networkweb/browsethread/thread/12be291b47a65868/04144bc0accb23f8#04144bc0accb23f8
Basically, running Itunes kills my network!
I have turned off all automatic network functions in Itunes, like automatic podcast updates and search for shared music. Turning off search for shared music seems to have solved the need to reboot every network device in my house, but running Itunes still causes the death of my wireless connection on my notebook.
I can only postulate that this MUST be the result of a recent XP update since Itunes was working just fine a few weeks ago. To test this theory, I will be doing a parallel OS install of XP SP2 on my laptop with no additional updates and Itunes the only installed application. I might try doing this in Virtual PC first, but I am not sure I could trust its results.

OK,
I just installed Itunes 6.0.1.3 on a fresh install of XP SP2 in Virtual PC.
Simply starting Itunes, No subscriptionsn no podcasts to update, and the same results.
Within 1 minute, the network connection on the VPC was dead and reported limited or no connectivity. Before it died, the wireless on my laptop began to decrease in speed. As soon as the network connection in VPC died, it began rising again. As with my desktop, my network devices activity lights lit up almost solid! The ethernet bridge that connects my ReplayTV to the network went solid on activity and my Replay was knocked off the network. It would appear the 6.0.1.3 is spewing a bunch of garbage on the network to the point that it is killing all my devices.
Whenever Itunes is open on any system on the network (In its default config), ALL devices lose network connectivity.
Now I will try an older version on the virtual PC and see what happens..
Stephen TN

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You might almost achieve your goal simply by requiring password on wake from sleep. the password prompt will have an option there to switch users.
If you truly want to make it automatic,
it's possible but a bit tricky.
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next, copy and paste the following into text editor. format it as plain text and save it as userswitcher.sh in Documents folder as well.
<pre style="
font-family: Monaco, 'Courier New', Courier, monospace;
font-size: 10px;
margin: 0px;
padding: 5px;
border: 1px solid #000000;
width: 720px;
color: #000000;
background-color: #ADD8E6;
overflow: auto;"
title="this text can be pasted into the Script Editor">
#!/bin/bash
idl=$"`ioreg -c IOHIDSystem | awk '/HIDIdleTime/ {print int($NF/1000000000); exit}'`"
wt=$3600
if [ $idl -gt $wt ]; then
open /users/$USER/documents/userswitcher.app
fi</pre>
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next make the script unix executable by running the following terminal command
chmod 755 ~/Documents/userswitcher.sh
Finally, download and install [Lingon|http://tuppis.com/lingon> and make a launch daemon to run the above script every minute.
Message was edited by: V.K.

Problems with SRW224G4 switch and Bridged Network Cards

Hello,
We have recently installed a SRW224G4 switch and have discovered that when we plug our DELL PowerEdge 2900 server into the switch, the switch loses all network connectivity and all of the LED's on the switch start flashing.
The server works perfectly well plugged into another switch, but as soon as we introduce the SRW224G4 into the network, either with the server plugged into that switch or any other, the problem re-occurs.
The only way we found we could eliminate this issue was if we disabled the Bridged Network connection on the two network cards on the server. If we do that, everything is fine, except the network performance of the server has dropped significantly.
The server is plugged into the 1GB ports on the switch, although we tried it on the 100MB ports and received the same problems. The switch reports that the ports are running at full-duplex.
Has anyone noticed this behavior before, and more importantly been able to rectify it.
Thanks in advance for your assistance,
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fdigi

My MacBook keeps switching the primary network connection to Ethernet cable

I've hooked up a Belkin N+ Wireless Router and it works just fine. Problem is everytime I shut down my computer or put it on sleep, the computer switches it's network connection to Ethernet and disconnects from my wireless network. I have to go into network settings and turn the airport on and refind my network in order to use the internet. Is there any way to make the computer set my wireless network as the primary network and not to change it? Thanks in advance for your help.

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ITunes kills my network

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Example: I load up grooveshark.com to listen to some music. First song loads fine and starts to play. As soon as I click to skip to the next song, networking dies. It returns as soon as I close the browser.
I can also duplicate this on youtube.com. I load a video, which loads and plays fine. If I try to switch its resolution, networking dies.
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This tells me there is a problem between the latest version of flash and a native bootcamp windows device driver.
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Also, those threads are from March, unresolved, and of course you can find almost anyone saying anything.
I have found loading a web site, that it will knock me off, and I attribute it to the web site or host and possible presence of malware or other issues. I can run 10 YouTube videos concurrently. When I upgraded to Vista and Intel Mac Pro 4 yrs ago, I had trouble and replaced some network equipment, then a year ago I upgraded modem to be more compatible with higher bandwidth broadband which helped a lot (Netgear, same as before but old model was no longer being supported or firmware updates available).
Latest Flash:
http://labs.adobe.com/technologies/flashplayer10/
Can't hurt to flush DNS cache, browsers, temp files and history etc. for which I use CCleaner (3.0).
http://www.piriform.com/products
Latest Java
http://www.oracle.com/technetwork/java/javase/downloads/index.html

Auto switch between two networks in one location

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I never realized that. Why is that?
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The relay (or remote) base station must listen for the data from the main base station.
The relay (or remote) base station must then transmit the data to the client.
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Every time you add a WDS relay or remote the available bandwidth gets cut again.
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How to avoid Dual Active VSS switches in the network...

Hi Team,
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Thanks for the reply Reza,
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5th ???
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Is Killer Network actually Killing My Network?

Hello All,
I have been running into issues this past week after a recent computer build. One of my computers either is having Video Card Issues, or Network Issues.
I have a "Lan Center" that I have built over the years in my basement. Ever since the early Beta Counterstrike days I have always ran more than 1 computer in my household. Most of my friends are broke hippies, but I work in IT and enjoy playing once in a while.
The Game : GTA V for PC
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The Hardware :
Computer 1 -
CPU -i7-5820K (No OC)
Video - EVGA GTX 970 (No OC)
Mobo - ASRock X99X
HDD - Samsung 850 Pro 512gb
Ram - Crucial 16GB DDR4
PSU - Corsair AX760
CPU Cooler - Corsair H75
Sound - Creative SB ZxR
Case - NZXT H440
OS - Win 7 64bit Pro
Computer 2 -
MSI GT60 20D-026US Laptop
CPU - i7 4700MQ (No OC)
Video - GTX 780m (No OC)
HDD - Samsung 840 EVO 500gb
Ram - 16GB DDR3
OS - Win 8.1 64bit
Computer 3 -
CPU - i7-4790K (No OC)
Video - Radeon HD7870 (No OC)
Mobo - MSI Z97-GD65
HDD - WD Black 1TB
Ram - Kingston 8GB DDR3
PSU - EVGA 750G2
CPU Cooler - Stock
Case - NZXT H440
OS - Win 7 64bit Pro
Network Equipment -
Connection - Comcast 50/10
Modem - Motorola SB6121
Router - Netgear N750
Troubleshooting : I have already updated all of the drivers for the current hardware. I have already ran ALL windows updates. I have already ran Speccy on the culprit pc (Computer 3). All idle temps are fine, I left it running while running the game and all temps appear to be fine then as well. What I don't understand is the network graph, while in game it shows HUGE spikes and inconsistency. Thinking it could be a network cable, I replaced it with a new one. I just don't understand why this computer would spike and the other two don't. Another possibility is, when building this computer, it was basically a swap from my main computer. I never uninstalled the drivers for my GTX 970, so I guess there is a possibility that that is causing the video issue. All have Killer NIC cards. So stands my question. Is Killer Network, killing my network? Any help would be greatly appreciated. Also, any tips on buffing up my network would be great as well. Thanks in advance!

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There is not really any reason that it should lag like that.

When Switching Locations, WIFI Network Does Not Change

Hello All, I have two Wifi Networks at my home. I have a main router and a wifi extender. I have two locations set up {Home, Home (extended)} but when i switch locations, my networks do not switch.

Double check your network/wifi settings. System Preferences>Network>Advanced>Wifi

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Thanks...

hi,
If you need to tune STP you can use a number of different methods. Yo can manually set the STP priority of your switches. The lower the number to more chance that it will be the root. Here are some commands:
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If you want the switch to look at all the priority numbers on the Spanning-Tree and decide for you use:
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Pls rate if this helps.
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How to manage dell-2816 switch from remote network..?

Hi,
According to below diagram how can i manage the dell-2816 switch from other network. It has management ip only worked on default vlan and default vlan is not editable also not routed ,we can only access the switch to connect laptop directly to switch port and if the port has default-vlan id-1 .
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Thanks
Mamdud
<ADMIN NOTE: Email id removed per privacy policy>

You would need a layer 3 device on the network that would route between the different networks/VLANs. Without a device performing VLAN routing, your only other option is to be on the VLAN 1 network.
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Added a switch & killed my network

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