Detecting Connection Loss

Hi All,
I'm working with two computers that are each running a LV program to achieve
TCP communication. Please see attached LLB. Both PCs are connected via a
switch that is running a DHCP server.
My plan was to watch the error cluster from the TCP Read function to ensure
that the connection is still valid.
So, to test this, I run the two VIs on the two PCs and I physically
disconnect the ethernet cable from one of the PCs.
What I am seeing is that only the PC that is disconnected from the network
registers and error (error 66). The other PC only registers a timeout
error.
My question is, how can I tell from the second PC that the connection has
been lost. I know that I could use a timer, but I was hoping to avoid that.
Thanks for you
help
Denis

I do not think there is another way do this than using a timeout. The deal is that the recieving computer monitors a port for data. This is the only way it gets information from the remote computer. It is not like there are status lines to verify connection. You can either wait a reasonable amount of time for the data--if it is not there then timeout, assuming a broken connection. Or you can use TCP to have the previously listen only computer now sending data to the previouly sending only computer. It is indirect, but now there is a two way dependency between the computers and both can detect a broken connection.

Similar Messages

Trying to detect connection loss

I have built a little telnet program which is specialized for a specific telnet supporting server... Everything works just fine except for detecting connection loss...
I am connected to the server using java.net.Socket, data is sent using java.io.PrintStream and data is received using java.io.InputStream...
I have tried having a thread running and looking if the Socket was still connected, but even after closing the server, the Socket keeps returning true when I call Socket.isConnected()... How could I detect the moment when a connection is broken, would it be because the user has a modem connection and gets disconnected or because the server shuts down or any other such reason?

You can detect a dead socket when a write to it fails.
So, you could periodically send "keep alive" messages
to know approximately when it drops.Okay, I had noticed that the PrintStream would set it's error state to true when I try to send a message and the socket is dead, but I hoped I didn't have to wait until that moment... Thanks though! You confirmed me I'll have to do it that way :P

Windows server 2012 and windows xp remote desktop connection loss

I am having this problem for a month now, and i am stumped with trying to find an answer . I have talked with several network admins in my area and with no luck i have not found a solution. I have a windows server 2012 placed with 5 pcs that are connected
on a local network , those 5 pc's connect to the server via remote desktop. List of pc's:
1x Windows 7
4x Windows XP SP3
All have the latests network drivers, all have the latest version of remote desktop installed. All have been scanned for viruses. All have antivirus software.
Problem is the 4 XP machines lose connection on when connected via remote desktop. If one starts losing connection the other 3 start to lose the connection aswell. The windows 7 machine is not affected by this it works fine.
What have I tried:
Scanning for viruses.
Disabling Firewall and antivirus software.
Updating all drivers.
Did many changes to group policy like keepalives etc.
Turning off SMBv2 SMBv3.
Turning off network adapter Offload settings.
Changed some registry settings like keepalive, smb etc.
Updating every pc and server with all windows updates.
Changed the router and switch.
Port forwarded needed ports like 3389.
Updating remote desktop to 7.0.
I might be forgetting some stuff i will add as i remember anything.
So the thing is this. I use a Windows XP machine from my office I remotely connect to the server via the Internet and I DO NOT experience any connection loss. BUT the XP machines on the local network constantly experience connection loss via remote desktop.
I pinged every Machine from the server via CMD command PING. So when they lose connection the Packets get time outs . Packets get dropped between 1-10 packets when a connection is lost. This packet drop does not occur when using the internet or anything else.
ONLY when connected to the server via remote desktop. The packets get dropped at random intervals.
Problem is I use an XP machine and I am not experiencing any loss of connection , while the XP machines on the local network experience it , but not the windows 7 machine.
Router is ASUS RT-N53 , and switch is Dlink DES-1008D. Server is a Dell PowerEdge T110 II.
Can someone please tell me what can i do to solve this problem?

So today got some word from their office. They were using RDP from 8AM until 12PM all was working fine. Then got back after lunch about 1PM and got a few connection lost errors when they tried using RDP again. Its weird since they didn't have disconnects
in the morning, and started having them after lunch.
Also noticed, that two pc were not using RDP and were disconnected as shown in task manager. And they still got request timeouts.
Maybe this is not a remote desktop issue?
TASK MANAGER
The 2 disconnected pc's ping screens:

Connection loss SUM GUI to SL Controller

Hi experts,
I am experiencing an issue that I need to resolve. It is that I lose the connection from SUM GUI (locally) to the SL Controller running on the remote server.
Currently I am doing an upgrade and after some time, e.g. when I have an error and don't notice it immediately, I get a warning message.
"The connection to the SL Controller is down.
The SDT GUI will reestablish the connection, when possible."
On the server I get the following error message:
May 26, 2014 7:49:47 AM [Error]: com.sap.sdt.engine.core.communication.FactoryAlreadyRegisteredException: Factory for key 'com.sap.sdt.engine.core.com
munication.FactoryKey@13c2c5f4' is already registered.
May 26, 2014 7:49:47 AM [Error]: com.sap.sdt.engine.core.communication.FactoryAlreadyRegisteredException: Factory for key 'com.sap.sdt.engine.core.com
munication.FactoryKey@13c2c5f4' is already registered.
May 26, 2014 7:49:47 AM [Error]: com.sap.sdt.server.core.ServerException
May 26, 2014 7:49:51 AM [Warning]: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
May 26, 2014 7:49:51 AM [Warning]: Error while closing connection.
May 26, 2014 7:49:51 AM [Error]: com.sap.sdt.engine.core.communication.SendException: Error while sending data.
Network input/output exception has occurred: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
java.net.SocketException: Broken pipe
May 26, 2014 7:49:51 AM [Error]: com.sap.sdt.engine.core.communication.SendException: Error while sending data.
Network input/output exception has occurred: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
java.net.SocketException: Broken pipe
My current assumption is that the firewall drops the connection due to inactivity.
The main issue then is:
although I restart my local SUM GUI and reconnect to the server I can't continue the upgrade because the Buttons are "unclickable" (grey).
Currently I always had to restart SUM including the services on ther server (SL controller).
My question is:
what can I do to avoid this connection loss?
Is there a option to set a "keep alive" to the network connection?
so that the firewall does not validate the connection as idle and drops?
Unfortunately we can't do much about the firewall settings due to security restrictions.
I would be glad to hear from you.
Kind regards,
Niklas

Hi Mathias,
I got an answer from SAP. There is no option that can be executed with STARTUP to solve this.
I already proposed to forward this request to the dev team at SAP
What I am currently doing is:
Start the GUI and keep it open only if I know if there is are Actions coming next, otherwise I close it (only the GUI) and when some time has passed by I logon again to check.
This is a really bad solution, but currently the only one.
Regards,
Niklas

Web service proxy take ~4 minutes to detect connection problem in AIX!

Dear All,
i am developing a client application that consume web service , by jdeveloper 10.1.3.1.
i found a problem, in AIX, that the web service proxy generated by jdeveloper take long time
to detect connection problem to the server (e.g. server is down, network down, invalid
ip address or port supplied).
in ms window, if the proxy can't reach the server, it throw exception within seconds.
but in ibm AIX, it take about 4 minutes !!! the time is too long until the exception is thrown.
could anybody help me?
is there something i can set to greatly shorten the hanging time when connection
problem?
thank you.

nobody experience this problem?

Why do I have Intermittent Wifi Connection Loss during music streaming ?

Hello,
I have an ipad3 and an iPhone 4S and I am getting with both devices interruption of the sound when I send music to the Apple TV. It generally happens after a few minutes. The signal for the wifi is still good and I have still access to the Internet I have tried all the recommendations of the article "iOS: Troubleshooting Wi-Fi networks and connections" but this did not help. I have used several applications for sending music to the Apple TV (music application from Apple and DSAudio from Synology) but I'm getting the same issue. I have also the same issue with the media center application from Bouygues Telecom connecting directly to my internet router. My router is a bbox sensation. I had also the same kind of issue with my old router when sensing photo albums to the internet: I had the error message "your system is running low on ressources". How can I solve these intermittent wifi connection losses ?

Try #5.
Some things to try first:
1. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
2. Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
3. Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
4. Go into your router security settings and change from WEP to WPA with AES.
5. Renew IP Address: (especially if you are droping internet connection)
    •    Launch Settings app
    •    Tap on Wi-Fi
    •    Tap on the blue arrow of the Wi-Fi network that you connect to from the list
    •    In the window that opens, tap on the Renew Lease button
6. Potential Quick Fixes When Your iPad Won’t Connect to Your Wifi Network
http://ipadinsight.com/ipad-tips-tricks/potential-quick-fixes-when-your-ipad-won t-connect-to-your-wifi-network/
~~~~~~~~~~~~~~~~~~~~~~~~~
Wi-Fi Fix for iOS 6
https://discussions.apple.com/thread/4823738?tstart=240
iOS 6 Wifi Problems/Fixes
How To: Workaround iPad Wi-Fi Issues
http://www.theipadfan.com/workaround-ipad-wifi-issues/
Another Fix For iOS 6 WiFi Problems
http://tabletcrunch.com/2012/10/27/fix-ios-6-wifi-problems-ssid/
Wifi Doesn't Connect After Waking From Sleep - Sometimes increasing screen brightness prevents the failure to reconnect after waking from sleep. According to Apple, “If brightness is at lowest level, increase it by moving the slider to the right and set auto brightness to off.”
Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
iOS 6 iPad 3 wi-fi "connection fix" for netgear router
http://www.youtube.com/watch?v=XsWS4ha-dn0
Apple's iOS 6 Wi-Fi problems
http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
~~~~~~~~~~~~~~~~~~~~~~~
How to Boost Your Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Boost-Your-Wi-Fi-Signal.h tm
Troubleshooting a Weak Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/Troubleshooting-A-Weak-Wi-Fi-Sig nal.htm
How to Fix a Poor Wi-Fi Signal on Your iPad
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Fix-A-Poor-Wi-Fi-Signal-O n-Your-iPad.htm
iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
How to Fix: My iPad Won't Connect to WiFi
http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Connect iPad to Wi-Fi (with troubleshooting info)
http://thehowto.wikidot.com/wifi-connect-ipad
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
Wi-Fi or Bluetooth settings grayed out or dim
http://support.apple.com/kb/TS1559
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

Connectivity loss between PLC and Kepware

Hi Experts,
I m working on SAP PCo and PLC connectivity using Kepware.
I m trying to find out ways to find connectivity loss between
1) PLC and kepware
2) kepware and PCo
For 2nd approch,if connectivity loss is there then PCo instance will go in error state and using remote monitoring we can get alert.
But m not able to find any way for 1st approch.
If PLC connection lost then only tag quality in kepware is bad.
Is there any way in PCo expression editor to check tag quality so that i can trigger MII transaction?
Thanks in advance.
Regards,
Neha

To add to Hubrisnsx's comment ... are you provisioned Ethernet or MoCA for the WAN connection?
Edit: Never mind, I see in the first post you said MoCA. So, if the MoCA channel is staying up, then it sounds like it might be something inside the ONT.
Keep in mind that while some Verizon folks do drop by these forums from time to time, that this is primarily are user to user forum where customers can help one another.

Calendar Crashes on connection loss.

Does anyone know why oracle calendar crashes when the connection to the calendar server is lost. This happens for both Mac and Windows. I am using calendar version 9.0.4.2

after much work I have discovered that this is due to power settings on the mac. if you don't turn off the hardrive it seems to work better. This however doesn't explain the corruption issues due to connection loss.

Internet connection loss using Airport Extreme and Netgear DG843

Hello,
I am accessing internet via a Netgear DG834 router (not wifi), connected to an Airport Extreme base station. Most of the time, I can access internet through the Wifi network of the AEB without any problem. But around once a day I am experiencing connection loss and the only way I found to restore it is to reset the Netgear Router by physically unplungging it.
Both the Netgear and the AEB have up to date firmware, so I suspect some kind of problem in my setup, as I am not an expert in setting up networks.
Is it possible that using a Netgear Router connected to the AE (which is also a router if I understand correctly) could cause connection problems ?
I am at a loss, and do not even know how to describe the relevant informations of my current setup. If a kind soul could help me nonetheless, I would be very gratefull.
Mr Pedrito
Powerbook G4 Mac OS X (10.3.9)

Is it possible that using a Netgear Router connected
to the AE (which is also a router if I understand
correctly) could cause connection problems ?
Yes.
Ensure that that the AEBS is configured to not distribute IP addresses.
Also ensure that the AEBS is on a different channel to the DG834G.
iFelix

HT1925 what to do when my ipone displays diferrent sim detected connect to itunes

hi
what to do when my ipone displays diferrent sim detected ,connect to itunes thanks for your reply in advance

When using recovery mode, you can only restore the device. All user content on the device will be erased, but if you had previously synced with iTunes on this computer, you can restore from a previous backup. See this article for more information.

How to detect connection

hi
i am developing an application which downloads data from a database(which is on server) to the client.
i want this program start automatically whenever client connects to the internet or a ras server. for this i think a program should run all the times at client detecting connection and when it founds that client has connected to the server it start the application which will download the data to the client
can someone give any idea about how this can be done.
how the connection can be detected.
also i want this whole process should be hidden there should be no taskbar button for these processes.
please tell me how to do this
thanks in advanse

i am facing the same problem pls help

Folders being closed upon connection loss?

The issue is that previously it would bring up an error saying that connection was lost and would still show the folders but without any contents, and it would've been possible to do a refresh when you'd have a connection, now it instantly brings to Network folder.
Update:
Previously before the OS reinstall, I've tested what's causing the CPU usage to go up so high using ProcessExplorer, and found out that explorer.exe is using too much services/libraries, mainly ntdll.dll, which is being looped constantly, i.o. ntdll.dll would be copied and copied and copied until you'd restart the process (explorer.exe)

Hello,I'm currently having an issue with a user that is often on the road and obviously it's often that connection is being lost. That person often opens a lot of folders that we have on our local file server, and as soon as his connection is lost it brings him to the "Network" folder. Any idea what could be the issue? Also CPU would rise up to a %100 in total (File explorer .exe consuming approx. 40-60% because explorer.exe has a looping ntdll.dll library being looped in its process).He uses a Dell XPS 13 ultrabook with a four core i7 processor.Before connection loss:After connection loss:
OS: 8.1 Pro (Latest updates)File server, DC&AD: Win Server 2012 R2, Folder share.
What has been tried:sfc /scannowOS reinstall
This topic first appeared in the Spiceworks Community

ATM PVC connectivity loss

To whom it may concern:
Our main problem is a connectivity issue, that follows them following pattern:
We have a DSLAM connected via an ATM cloud to our BRAS named iadsl-tlx-staana-2, the assigned IP address to the DSLAM is 201.122.81.209; this one has to be reached via the following PVC:
iadsl-tlx-staana-2#sh run int ATM 6/0/1.1
Building configuration...
Current configuration : 483 bytes
interface ATM6/0/1.1 multipoint
description GESTION DSLAM
mtu 9180
ip address 201.122.81.222 255.255.255.240
ip access-group dslams out
ip verify unicast reverse-path
no ip mroute-cache
atm pppatm passive
pvc 2/32
protocol ip 201.122.81.209 broadcast
ubr 128
encapsulation aal5snap
Our customers had been complaining about connectivity issues, while troubleshoot it we noticed that we did not have connectivity at all:
iadsl-tlx-staana-2#ping 201.122.81.209
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 201.122.81.209, timeout is 2 seconds:
Success rate is 0 percent (0/5)
iadsl-tlx-staana-2#
So in order to obtaing more information we enabled the following debug the which showed the output docummented as follows:
iadsl-tlx-staana-2#debug atm packet interface atm6/0/1.1
ATM packets debugging is on
Displaying packets on interface ATM6/0/1.1
iadsl-tlx-staana-2#show debug
Generic ATM:
ATM packets debugging is on
Oct 10 13:32:00: ATM6/0/1.1(O):
VCD:0x1 VPI:0x2 VCI:0x20 DM:0x100 SAP:AAAA CTL:03 OUI:000000 TYPE:0800 Length:0x70
Oct 10 13:32:00: 4500 0064 109B 0000 FF01 7459 C97A 51DE C97A 51D1 0800 7504 0049 0002 0000
Oct 10 13:32:00: 0001 7FCD 892C ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
Oct 10 13:32:00: ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
Oct 10 13:32:00: ABCD ABCD ABCD ABCD ABCD
Oct 10 13:32:00:
Oct 10 13:32:01: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:02: ATM6/0/1.1(O):
VCD:0x1 VPI:0x2 VCI:0x20 DM:0x100 SAP:AAAA CTL:03 OUI:000000 TYPE:0800 Length:0x70
Oct 10 13:32:02: 4500 0064 109C 0000 FF01 7458 C97A 51DE C97A 51D1 0800 6D23 0049 0003 0000
Oct 10 13:32:02: 0001 7FCD 910C ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
Oct 10 13:32:02: ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
Oct 10 13:32:02: ABCD ABCD ABCD ABCD ABCD
Oct 10 13:32:02:
Oct 10 13:32:03: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:04: ATM6/0/1.1(O):
VCD:0x1 VPI:0x2 VCI:0x20 DM:0x100 SAP:AAAA CTL:03 OUI:000000 TYPE:0800 Length:0x70
Oct 10 13:32:04: 4500 0064 109D 0000 FF01 7457 C97A 51DE C97A 51D1 0800 6552 0049 0004 0000
Oct 10 13:32:04: 0001 7FCD 98DC ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
Oct 10 13:32:04: ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
Oct 10 13:32:04: ABCD ABCD ABCD ABCD ABCD
Oct 10 13:32:04:
Oct 10 13:32:04: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:04: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:06: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:06: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:07: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Oct 10 13:32:07: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
Verifying the PVC counters:
ATM6/0/1.1: VCD: 1, VPI: 2, VCI: 32
UBR, PeakRate: 128 (302 cps)
    CDVT: 714.0 Usecs, High Watermark: 56, Low Watermark: 48
AAL5-LLC/SNAP, etype:0x0, Flags: 0x1040, VCmode: 0x0, Encapsize: 12
OAM frequency: 0 second(s), OAM retry frequency: 1 second(s)
OAM up retry count: 3, OAM down retry count: 5
OAM Loopback status: OAM Disabled
OAM VC Status: Not Managed
OAM Loop detection: Disabled
ILMI VC status: Not Managed
InARP frequency: 15 minutes(s)
High Watermark: 56, Low Watermark: 48
InPkts: 0, OutPkts: 0, InBytes: 0, OutBytes: 0
InPRoc: 0, OutPRoc: 423, Broadcasts: 0
InFast: 0, OutFast: 0
InPktDrops: 0, OutPktDrops: 0
Out CLP=1 Pkts: 0
OAM cells received: 0
F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI: 0
OAM cells sent: 5
F5 OutEndloop: 5, F5 OutSegloop: 0, F5 OutAIS: 0, F5 OutRDI: 0
OAM cell drops: 0
Status: UP
We realized thar there were not packets comming nor incoming through the pvc mentioned.
Afterwards, PVC 2/32 was reconfigured as follows:
iadsl-tlx-staana-2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
iadsl-tlx-staana-2(config)#int ATM6/0/1.1 multipoint
iadsl-tlx-staana-2(config-subif)#no pvc 2/32
iadsl-tlx-staana-2(config-subif)#pvc 2/32
iadsl-tlx-staana-2(config-if-atm-vc)# protocol ip 201.122.81.209 broadcast
iadsl-tlx-staana-2(config-if-atm-vc)# ubr 128
iadsl-tlx-staana-2(config-if-atm-vc)# encapsulation aal5snap
In consequence connectivity has been restored:
iadsl-tlx-staana-2#ping 201.122.81.209
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 201.122.81.209, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/52/60 ms
To provide you more information about our BRAS let me send you the following details:
model:
Cisco C10008 (PRE4-RP)
software version:
12.2(33)SB10
LC:
4oc3atm-1
Can anyone help me to determine the root cause of this behavior?
Thanks and regards!
elporsche & Juli

I assume these are all on the same SSID and same subnet, i.e. there are no layer 3 roaming issues since you did not mention if you use LWAPP APs. In any case I used to roam all the time with telnet sessions to Cisco switches. If it is dropping the session, it is more likely because of the host system. You could test that by testing to a Cisco device.
A couple of suggestions:
1. Use WPA2 instead of WPA. WPA2 handles roaming better.
2. If you are using XP wireless make sure you have the Microsoft WPA2 update installed. Not necessary if you use another wireless supplicant.
3. Test roaming with a laptop from room to room. If you are loosing more than two pings or so, your roaming sensitivity is not working optimally. Use continuous pings.
4. You could go to fast roaming using CCKM; however, I would make sure the standard roaming method is working correctly before going to the effort of changing everything. Besides, you will need to have a wireless client capable of CCKM. If not, you are out of luck. I had that problem with some of my Windows CE devices. They were too dumb to use CCKM.
5. I did have some Windows CE devices which did not roam properly until I had the roaming sensivity set. I was loosing about 7 pings. This is not normal unless you have a problem.
6. Last resort - but expensive. We had an intermediate server that would hold sessions to SAP due to the potential of the same problem you have. The company that provided it to us was Psion Teklogix. It prevented session loss because a server held the session, not the mobile client. A company like this one should be able to modify the application to your needs if you have money to spend.
Testing is the key I think, but WPA2 would have to help due to the caching of authentications. If you go back to a room you were just in, it should roam faster.
Randy

Linksys Connection Loss

Hi... first time posting.. anyway.. i have a linksys router.. the generic one they sell at walmart... you know.. the WG.. im too drunk to get the name from downstairs(wireless G, two antennas)... anyway.. it constantly loses the internet.. it will sometimes show that i have limited access.. although, most of the time when it messes up it shows nothing... i can go to windows mobility center (vista) and disable and enable my wireless card a few times.. and eventually, it will show there is an internet connection.. (because there is), i just wonder... why does it lose the ability to detect and use my dsl connection? .. sometimes if something (my ps3 or my computer) terminates weird (im lazy, turn it off with the 7 second kill or the dreaded try to used two devices at once... ) it will sometimes go into.. well... i can only describe it as a 'state' which it cannot find the internet.. after a while (and some serious messing around with it) it can find the internet and connect... sometimes tho.. i have to reset it to default to make it work... and it only works after i try repeated connections to it on my laptop.. (i know this because ive done it... alot) whats wrong.. and how can i make it keep a good internet connection all the time.. regardless of whats connecting disconnecting from it...? Any insight would be appreciated.

My Router WRT54G just started losing it's Internet connection yesterday for no appearent reason. Local network works but cannot connect to Internet via Cable Modem.
Direct connection via Cable modem connects to Internet. Cable Provider reports connection to both Cable Modem and Router Okay.
Wireless and Wired connection via Router fails. Multable computerers and devices wireless including Xbox and PS3 (both off when internet lost).
Powering down both does NOT reastablish connection.
Returning to "Factory Defualt" does restore connection.
Today, connection was fixed with "Restoring a saved Configuration". Less hassel as configurations do not need to be changed with this.
I would like to find the cause and a permanant fix before the kids lynch the 'System Administrator' (me) when they loss the Internet.

Connectivity loss when roaming from AP to AP

I work for a healthcare organization where nurses use what we refer to as COWS, or carts on wheels. These carts are basically laptops attached to carts that utilize our wireless infrastructure to access patient care applications.
The problem we've been having and working with the application developers on is that, whenever the carts are moved between patient rooms and have to associate with a different AP, the telnet connection that the application uses to establish connectivity is dropped during the short delay in the changeover.
Anyone have any experience with settings that might mitigate this? Far as I know there are no telnet timers that can be adjusted(buffered) to help with this situation, and I'm not certain if anything can be adjusted on the wireless network to help. The "fix" has been to have the user reboot to re-establish the telnet session and then everything's good again.
Any suggestions on things to try?
Thanks.
/rls

I assume these are all on the same SSID and same subnet, i.e. there are no layer 3 roaming issues since you did not mention if you use LWAPP APs. In any case I used to roam all the time with telnet sessions to Cisco switches. If it is dropping the session, it is more likely because of the host system. You could test that by testing to a Cisco device.
A couple of suggestions:
1. Use WPA2 instead of WPA. WPA2 handles roaming better.
2. If you are using XP wireless make sure you have the Microsoft WPA2 update installed. Not necessary if you use another wireless supplicant.
3. Test roaming with a laptop from room to room. If you are loosing more than two pings or so, your roaming sensitivity is not working optimally. Use continuous pings.
4. You could go to fast roaming using CCKM; however, I would make sure the standard roaming method is working correctly before going to the effort of changing everything. Besides, you will need to have a wireless client capable of CCKM. If not, you are out of luck. I had that problem with some of my Windows CE devices. They were too dumb to use CCKM.
5. I did have some Windows CE devices which did not roam properly until I had the roaming sensivity set. I was loosing about 7 pings. This is not normal unless you have a problem.
6. Last resort - but expensive. We had an intermediate server that would hold sessions to SAP due to the potential of the same problem you have. The company that provided it to us was Psion Teklogix. It prevented session loss because a server held the session, not the mobile client. A company like this one should be able to modify the application to your needs if you have money to spend.
Testing is the key I think, but WPA2 would have to help due to the caching of authentications. If you go back to a room you were just in, it should roam faster.
Randy

Detecting Connection Loss

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