Connectivity weirdness - unrecoverable loss in connection

Hey everyone. I'm having a very weird problem occuring randomly (several times) thoughout the day.
I have a local network with my G5, PB and PC (ugh) connected to my DLink DI-624 Router. Everythings been working great for years.... (though I remember having this problem a while back)
Every once and a while my connection goes down on my G5, but the other machines work fine. (It's not the router...restarting it doesn't help)
Checking my G5 when the connection is down, I see that my IP which was local and statically set to an IP on my DHCP router changes from the local IP to a random external (169.xxx.xxx.xxx) different one that is no even my external IP.
Also, there is an error in my console.log that says:
repeated transitions for interface en0
and my system.log says a lot more:
Jun 22 18:01:10 G5-Machine kernel[0]: UniNEnet::monitorLinkStatus - Link is down.
Jun 22 18:01:13 G5-Machine launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[827]: exited abnormally: Hangup
Jun 22 18:01:13 G5-Machine configd[36]: posting notification com.apple.system.config.network_change
Jun 22 18:01:14 G5-Machine lookupd[1304]: lookupd (version 369.2) starting - Thu Jun 22 18:01:14 2006
Jun 22 18:01:15 G5-Machine kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex
Jun 22 18:01:20 G5-Machine configd[36]: posting notification com.apple.system.config.network_change
Jun 22 18:01:20 G5-Machine lookupd[1309]: lookupd (version 369.2) starting - Thu Jun 22 18:01:20 2006
Jun 22 18:01:25 G5-Machine kernel[0]: in_delmulti - ignorning invalid inm (0x656e0000)
Jun 22 18:01:25 G5-Machine lookupd[1313]: lookupd (version 369.2) starting - Thu Jun 22 18:01:25 2006
Jun 22 18:01:25 G5-Machine configd[36]: posting notification com.apple.system.config.network_change
Jun 22 18:01:25 G5-Machine lookupd[1314]: lookupd (version 369.2) starting - Thu Jun 22 18:01:25 2006
Jun 22 18:01:27 G5-Machine mDNSResponder: Repeated transitions for interface en0 (192.168.0.100); delaying packets by 5 seconds
Jun 22 18:02:33 G5-Machine kernel[0]: UniNEnet::monitorLinkStatus - Link is down.
Jun 22 18:02:37 G5-Machine configd[36]: posting notification com.apple.system.config.network_change
Jun 22 18:02:37 G5-Machine lookupd[1327]: lookupd (version 369.2) starting - Thu Jun 22 18:02:37 2006
Jun 22 18:02:38 G5-Machine kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex
Jun 22 18:02:42 G5-Machine configd[36]: posting notification com.apple.system.config.network_change
Jun 22 18:02:42 G5-Machine lookupd[1330]: lookupd (version 369.2) starting - Thu Jun 22 18:02:42 2006
The only thing that brings the connection back up (that I have found) is restarting the machine. On restart, everything is back to normal.
Does anyone know of anything I can do to get this to stop happening and/or a way to get the connection back when it does without restarting?
ANY help would be appreciated
Powermac G5 2.5DP Mac OS X (10.4.5)

This problem is still happening. I've tried changing cables, changing router ports, re-installing the router firmware. etc. Its still occurring. Its not the router b/c all my other 6 devices don't lose their connections.
i've noticed that sometimes it switches to that weird 169.xxx.xxx.xxx address. I lose connection. go to my network prefs, and it reconnects. But most times, it goes to that weird ip and never goes back. I can;t get the connection back or get to the router.
Rebooting the machine is the only thing that fixes it. temporarily.
Here is a look at the latest system.log activity. You can see that there's some weird activity during 12:19 and 1:13 when it finally loses connection. Any one have ANY ideas here?
Aug 8 00:19:49 G5-Machine kernel[0]: UniNEnet::monitorLinkStatus - Link is down.
Aug 8 00:19:53 G5-Machine configd[41]: posting notification com.apple.system.config.network_change
Aug 8 00:19:53 G5-Machine lookupd[3755]: lookupd (version 369.5) starting - Tue Aug 8 00:19:53 2006
Aug 8 00:19:54 G5-Machine kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex
Aug 8 00:19:59 G5-Machine configd[41]: posting notification com.apple.system.config.network_change
Aug 8 00:19:59 G5-Machine lookupd[3758]: lookupd (version 369.5) starting - Tue Aug 8 00:19:59 2006
Aug 8 00:20:05 G5-Machine kernel[0]: in_delmulti - ignorning invalid inm (0x656e00c0)
Aug 8 00:20:05 G5-Machine lookupd[3767]: lookupd (version 369.5) starting - Tue Aug 8 00:20:05 2006
Aug 8 00:20:05 G5-Machine configd[41]: posting notification com.apple.system.config.network_change
Aug 8 00:20:05 G5-Machine lookupd[3768]: lookupd (version 369.5) starting - Tue Aug 8 00:20:05 2006
Aug 8 00:20:07 G5-Machine mDNSResponder: Repeated transitions for interface en0 (192.168.0.100); delaying packets by 5 seconds
Aug 8 01:13:20 G5-Machine kernel[0]: UniNEnet::monitorLinkStatus - Link is down.
Aug 8 01:13:24 G5-Machine lookupd[3851]: lookupd (version 369.5) starting - Tue Aug 8 01:13:24 2006
Aug 8 01:13:24 G5-Machine configd[41]: posting notification com.apple.system.config.network_change
Aug 8 01:13:24 G5-Machine lookupd[3852]: lookupd (version 369.5) starting - Tue Aug 8 01:13:24 2006
Aug 8 01:13:25 G5-Machine kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex
Aug 8 01:13:27 G5-Machine kernel[0]: { 1104 400} UniNEnet::restartTransmitter - transmitter appeared to be hung.
Aug 8 01:13:30 G5-Machine configd[41]: posting notification com.apple.system.config.network_change
Aug 8 01:13:30 G5-Machine lookupd[3856]: lookupd (version 369.5) starting - Tue Aug 8 01:13:30 2006

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Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
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Line Quality Test 1
Line Quality Test 2
Line Quality Test 3
Line Quality Test 4
Line Quality Test 5

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2013/01/08 04:33:44.24 M removing multicast group 224.0.0.1 from device br0 port 8
2013/01/08 04:33:44.24 M removing multicast group 224.0.0.1 from device br0 port 4
2013/01/08 04:33:44.24 M removing multicast group 224.0.0.1 from device br0 port 2
2013/01/08 04:33:44.24 M removing multicast group 224.0.0.1 from device br0 port 1
2013/01/08 04:33:44.24 M removing multicast group 224.0.0.1 from device br0 port 0
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2013/01/08 04:33:44.24 M init igmp proxy module
2013/01/08 04:33:44.24 M lan if init br0
2013/01/08 04:33:44.24 M adding multicast group 224.0.0.1 to device br0 port 0
2013/01/08 04:33:44.24 M adding multicast group 224.0.0.1 to device br0 port 1
2013/01/08 04:33:44.24 M adding multicast group 224.0.0.1 to device br0 port 2
2013/01/08 04:33:44.24 M adding multicast group 224.0.0.1 to device br0 port 4
2013/01/08 04:33:44.24 M adding multicast group 224.0.0.1 to device br0 port 8
2013/01/08 04:33:44.24 M adding multicast group 224.0.0.1 to device br0 port 16
2013/01/08 04:33:44.31 M jan  8 04:33:43 syslog: check_exit: exiting
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2013/01/08 04:33:45.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:45.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:45.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:45.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:45.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:45.10 M @@ setting new value completed, it should show new value in proc/proxy
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2013/01/08 04:33:45.28 M removing multicast group 224.0.0.1 from device br0 port 8
2013/01/08 04:33:45.28 M removing multicast group 224.0.0.1 from device br0 port 4
2013/01/08 04:33:45.28 M removing multicast group 224.0.0.1 from device br0 port 2
2013/01/08 04:33:45.28 M removing multicast group 224.0.0.1 from device br0 port 1
2013/01/08 04:33:45.28 M removing multicast group 224.0.0.1 from device br0 port 0
2013/01/08 04:33:45.28 M uninit igmp proxy module
2013/01/08 04:33:45.28 M init igmp proxy module
2013/01/08 04:33:45.28 M lan if init br0
2013/01/08 04:33:45.28 M adding multicast group 224.0.0.1 to device br0 port 0
2013/01/08 04:33:45.28 M adding multicast group 224.0.0.1 to device br0 port 1
2013/01/08 04:33:45.28 M adding multicast group 224.0.0.1 to device br0 port 2
2013/01/08 04:33:45.28 M adding multicast group 224.0.0.1 to device br0 port 4
2013/01/08 04:33:45.28 M adding multicast group 224.0.0.1 to device br0 port 8
2013/01/08 04:33:45.28 M adding multicast group 224.0.0.1 to device br0 port 16
2013/01/08 04:33:46.10 M igmprx_lan_port_add_single: ifname=br0  ifindex=9
2013/01/08 04:33:46.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:46.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:46.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:46.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:46.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:33:46.10 M eth1: stopped
2013/01/08 04:33:46.10 M eth1: mac address changed
2013/01/08 04:33:46.10 M port 0: setting mac to 0x1, status: 0x2c3d
2013/01/08 04:33:46.10 M eth1: link up
2013/01/08 04:33:46.10 M eth1: started
2013/01/08 04:35:27.24 M eth1: link up, device will be up
2013/01/08 04:35:27.54 M clink1: lof 1000mhz
2013/01/08 04:35:27.55 M mt_igmp_params_init:223: reconf: new lan interface: br0, ver 3
2013/01/08 04:35:27.63 M clink1: link up, device will be up
2013/01/08 04:35:27.63 M lan if uninit br0
2013/01/08 04:35:27.63 M removing multicast group 224.0.0.1 from device br0 port 16
2013/01/08 04:35:27.63 M removing multicast group 224.0.0.1 from device br0 port 8
2013/01/08 04:35:27.63 M removing multicast group 224.0.0.1 from device br0 port 4
2013/01/08 04:35:27.63 M removing multicast group 224.0.0.1 from device br0 port 2
2013/01/08 04:35:27.63 M removing multicast group 224.0.0.1 from device br0 port 1
2013/01/08 04:35:27.63 M removing multicast group 224.0.0.1 from device br0 port 0
2013/01/08 04:35:27.63 M uninit igmp proxy module
2013/01/08 04:35:27.63 M init igmp proxy module
2013/01/08 04:35:27.63 M lan if init br0
2013/01/08 04:35:27.63 M adding multicast group 224.0.0.1 to device br0 port 0
2013/01/08 04:35:27.63 M adding multicast group 224.0.0.1 to device br0 port 1
2013/01/08 04:35:27.63 M adding multicast group 224.0.0.1 to device br0 port 2
2013/01/08 04:35:27.63 M adding multicast group 224.0.0.1 to device br0 port 4
2013/01/08 04:35:27.63 M adding multicast group 224.0.0.1 to device br0 port 8
2013/01/08 04:35:27.63 M adding multicast group 224.0.0.1 to device br0 port 16
2013/01/08 04:35:28.10 M igmprx_lan_port_add_single: ifname=br0  ifindex=9
2013/01/08 04:35:28.10 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:28.12 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:28.12 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:28.12 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:28.12 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:36.79 M mt_igmp_params_init:223: reconf: new lan interface: br0, ver 3
2013/01/08 04:35:36.79 M mt_igmp_params_init:235: reconf: new wan interface: eth1
2013/01/08 04:35:36.85 M dhcp client: wan ethernet renew ip address: 173.56.37.223
2013/01/08 04:35:36.85 M dhcp client: wan ethernet renew netmask: 255.255.255.0
2013/01/08 04:35:36.85 M dhcp client: wan ethernet renew gateway: 173.56.37.1
2013/01/08 04:35:36.85 M dhcp client: wan ethernet renew dns server: 208.67.222.222 208.67.220.220
2013/01/08 04:35:36.90 M lan if uninit br0
2013/01/08 04:35:36.90 M removing multicast group 224.0.0.1 from device br0 port 16
2013/01/08 04:35:36.90 M removing multicast group 224.0.0.1 from device br0 port 8
2013/01/08 04:35:36.90 M removing multicast group 224.0.0.1 from device br0 port 4
2013/01/08 04:35:36.90 M removing multicast group 224.0.0.1 from device br0 port 2
2013/01/08 04:35:36.90 M removing multicast group 224.0.0.1 from device br0 port 1
2013/01/08 04:35:36.90 M removing multicast group 224.0.0.1 from device br0 port 0
2013/01/08 04:35:36.90 M uninit igmp proxy module
2013/01/08 04:35:36.90 M init igmp proxy module
2013/01/08 04:35:36.90 M lan if init br0
2013/01/08 04:35:36.90 M adding multicast group 224.0.0.1 to device br0 port 0
2013/01/08 04:35:36.90 M adding multicast group 224.0.0.1 to device br0 port 1
2013/01/08 04:35:36.90 M adding multicast group 224.0.0.1 to device br0 port 2
2013/01/08 04:35:36.91 M adding multicast group 224.0.0.1 to device br0 port 4
2013/01/08 04:35:36.91 M adding multicast group 224.0.0.1 to device br0 port 8
2013/01/08 04:35:36.91 M adding multicast group 224.0.0.1 to device br0 port 16
2013/01/08 04:35:36.91 M out: [62] nat error: no free nat ip ([62] nat error: no free nat ip: )
2013/01/08 04:35:37.19 M igmprx_lan_port_add_single: ifname=br0  ifindex=9
2013/01/08 04:35:37.19 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:37.19 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:37.19 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:37.19 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:37.19 M igmprx_lan_port_add_single: ifname=eth0  ifindex=2
2013/01/08 04:35:37.19 M @@ setting new value completed, it should show new value in proc/proxy
2013/01/08 04:35:47.83 M acs ack: event = 4 value change
I setup syslog on the router which feeds it to the WallWatcher application and this is all the details I get duing the flap. I'm really stumped by this and can't figure out what the problem is. Could it be a bad PON card? I noticed that the logs show only the WAN Coax going down without the LAN Coax which leads me to believe in a faulty connection between the router and the ONT. I've already tried connecting both routers directly to the ONT to no avail. The only changes that I can think of since Sandy are the electrical outlets that were replaced. Could they be causing some kind of interference? I've tried running the coax with and without the ground block, but that didn't help either. The only thing that was not replaced since the first post-Sandy installation is the ONT battery system, only the battery itself was replaced once. Could that be it? Just to be clear, I have always been connected via coax and I have tried testing with different cables.

Methods to detect loss of connection with CRIO

I am developing an application with CRIO. The CRIO has an application in real time in which you are sharing a variable temperature. In my host PC I have an application that will receive this temperature and stored in a database. I need to detect the beginning of my program if present the CRIO and prompting a loss of connection and the system can not initialize.

This is the cRIO code. All it does is continuously update a variable that can be read by the HMI. It is important that this loop runs faster than the HMI loop to prevent false alarms.
The HMI code may look something like this. It is reading the variable being written to by the cRIO. If it does not change, the communication code is not running. You would probably want to do something if Comm's Lost goes true other than turn on an indicator.
There are many ways to do this and you may receive some better ideas from the forum.

Sudden loss of connection all together

I'll start off by saying hello to everyone.
We've had infinity installed for some time now. I'm talking many months, definitely more than 18. This is the first time we have encountered a sudden loss of internet connection. We have already called BT and followed all their steps but what the people at the call centre don't understand is we want to know WHY! Not the possibilities, a solid reason. I was always able to give this to our business customers when I worked first line support. We recently had a storm which I think is contributing, since going over everything many times and no joy I have wondered about the phone line. Since the loss of connection it has always got massive static interference on the line. The service updates say all is good, but I can't help but think that page is just nonsense and that it is at fault and that BT are too up themselves to admit the fault is their end.
Can anyone shed some light on this for me?
Thank you very much in advance.

Is anything shown here. http://usertools.plus.net/exchanges/mso.php
http://usertools.plus.net/exchanges/?
http://btbusiness.custhelp.com/app/service_status
http://bt.custhelp.com/app/answers/detail/a_id/15036
http://community.plus.net/exchange-information/
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WRT120N - repeated loss of connection requiring reboot

I have an old WRT54GL that has been really good over the years but it was becoming problematic and I decided it was time to get an N router. After a visit to the local PC shop I picked up the WRT120N and brought it home then proceeded to set it up. I got that done and I was using it set to G only as I have an older laptop that can't use N and the router only comes with 1x USB adapter.
After a few days I noticed the internet side of the connection would randomly drop out but I could still access the router wirelessly. Rebooting the router resolved it but it keeps happening regardless of if I use G or N. The confusing thing in this is that it works fine for a while and one laptop works all the time. If it wasn't for the fact that a reboot solves the problem temporarily I would consider the laptop's wireless chip at fault so it points to something with the router.
I've updated the firmware to the latest available but it still happens. Rebooting whenever it happens isn't a solution and unless Cisco have some solution I'm going to end up returning it.

I've given it a fair shot I think. After you posted I reset it to factory default then reconfigured it as well as removing the USB adapter from the equation. After almost two weeks the router has effectively dropped the connection twice a week, or three times in the past week. Each time the same thing will happen and the only solution is to reboot the router. The router is listed on available wireless connections, I can try to connect to it but it will fail for any device. Wired connections aren't affected but that isn't very helpful.
Wired connections seem to suffer a stuttering performance too where there's no throughput whatsoever for a few minutes but otherwise it works. Wireless performance is acceptable but these repeated instances of the connection dropping out mean that I'm resigned to taking it back for a refund.

LTE 3G being weird says no internet connection

I have an iPhone 5 32GB and it says that is is running LTE or 3G and then my apps say no internet connection, cannot connect to the internet, app must have an internet connection. I try and connect to Wifi and it is a little bit better but it still happens... Any Suggestions? Went to apple and they replaced it and the new one is still doing the same thing?

same issue from modesto ca. We currently cant even connect to the internet on our devices over 3g or lte

Connectivity weirdness - unrecoverable loss in connection

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