weard network problem

[keeney123]

Problem was can't access Google Maps, Google News and Youtube. Found that the Network Address Translator thought 2 devices were addressing it. Solution was to reset Comcast modem and Netgear Ethernet Switcher. So not know a great deal on a NAT I am wondering why this got screwed up?

[Uranium-235]

Re: weard network problem

is it a modem and a network switch? no router? having a network switch on a MODEM and not a ROUTER will attempt to assign PUBLIC ip addresses to your device. Most ISP's only allow one or two public IP's. Having a router (NAT) lets you map the single public IP to several private IP's. If you're using just a switch and a modem with no routing, the different devices connected are going to fight for IP addresses, and it will only assign one or two at a time

[keeney123]

Re: weard network problem

So it is a Comcast modem connected with through the Ethernet to to a Belkin wireless Router and that wireless Router is they connected through its Ethernet to a Netgear SW. So the complete description is there is one input line into a Comcast modem which then is connected through the Ethernet to a Belkin wireless router that Router is then connected through it's Ethernet ports to two separate Ethernet switches, one switch for the tenants and one for the staff. If other machines are connected to the wireless router wirelessly I do not know.

[SteveNielsen]

Re: weard network problem

It is not unusual for network devices to hang and need a power cycle once in a while.

[stj]

Re: weard network problem

if the firmare is shit.

[SteveNielsen]

Re: weard network problem

Hardware too. Even in higher scale gear.

[stj]

Re: weard network problem

my TP-Link stuff never needs a reboot.

[goontron]

Re: weard network problem

my TP-Link stuff never needs a reboot.

nor linksys with DDWRT, or Asus with Tomato!

[SteveNielsen]

Re: weard network problem

I can't say that I have any recent experience with any newer enterprise gear but when I was working in networks router reboots were required under certain circumstances every so often when errors accumulated too quickly and they basically ran out of RAM.

Home wifi routers I've used are not without issues, even using DD-WRT. ISP supplied modems also have a need to reboot once in a while in my experience.

[keeney123]

Re: weard network problem

I just wanted to know why it is happening, with this particular problem.

[SteveNielsen]

Re: weard network problem

Is it a recurring problem?

[keeney123]

Re: weard network problem

I do not know as the problem happened about 4 days after they reprogrammed the computers, after I took one computer over. Then this problem went on for about one week before I figured out what happened. I then convinced the live in manager to open a lock door and restart both the switcher and modem. That took care of the problem, but I figure the problem should not happened in the first place.

[diif]

Re: weard network problem

The problem shouldn't happen as many problems with computers shouldn't happen but they just do.
Belkin is cheap home kit and I know Netgear switches suffer from bad caps.

[keeney123]

Re: weard network problem

To me if this is the case then the people who design and program these devices need to get together and figure out the problem so they do not happen again. Just accepting that this is the case, to me, is not an answer. When I was a technician and a problem occurred we would inform the engineering department. The engineering department would determine if it was created by one or several different areas. If it was several areas they would take 3 engineers and solve the individual areas that created the problem so the problem did not happen again.

[keeney123]

Re: weard network problem

is it a modem and a network switch? no router? having a network switch on a MODEM and not a ROUTER will attempt to assign PUBLIC ip addresses to your device. Most ISP's only allow one or two public IP's. Having a router (NAT) lets you map the single public IP to several private IP's. If you're using just a switch and a modem with no routing, the different devices connected are going to fight for IP addresses, and it will only assign one or two at a time

So with your information the problem would appear to be in the Belkin Router because the router is assigning the NAT. This makes sense because I heard the other Ethernet Switch for the staff which also is connected to this router was a having similar problems. The thing is I did not reset the Belkin Router. I just reset the modem and the Ethernet Switch and that cured the problem.

[stj]

Re: weard network problem

if it happens again, just reset the modem and see if it fixes it.
a lot of cheap modems / routers have badly written firmware that slowly leaks memory until you have no free ram left.
the Linux based ones are usually fine, it's the ones with less flash that use operating systems like VxWorks that seem to be poorly written.

[keeney123]

Re: weard network problem

if it happens again, just reset the modem and see if it fixes it.
a lot of cheap modems / routers have badly written firmware that slowly leaks memory until you have no free ram left.
the Linux based ones are usually fine, it's the ones with less flash that use operating systems like VxWorks that seem to be poorly written.

Stj I will try that if it happens again which I am sure it will. Usually problems don't go away by their selves.

[SteveNielsen]

Re: weard network problem

if it happens again, just reset the modem and see if it fixes it.
a lot of cheap modems / routers have badly written firmware that slowly leaks memory until you have no free ram left.
the Linux based ones are usually fine, it's the ones with less flash that use operating systems like VxWorks that seem to be poorly written.

Well, the modem and router are different devices in this situation. He said it was an NAT problem. The router does the NAT, not the modem. I'd reset the router.

I agree that the Belkin router would be better running a Linux-based OS if for no other reason than giving a lot more control of the router, but it may not cure the real problem if it is due to a hardware flaw that cause the memory leak. I've used a Belkin wifi router running DD-WRT but it still needed rebooting now and again. Tweaking parameters to use less memory helps delay running out of memory but it does not prevent it.

[stj]

Re: weard network problem

what are the makes and models of the equipment?
maybe it can be flashed with http://openwrt.org/

[keeney123]

Re: weard network problem

Well, the modem and router are different devices in this situation. He said it was an NAT problem. The router does the NAT, not the modem. I'd reset the router.

I agree that the Belkin router would be better running a Linux-based OS if for no other reason than giving a lot more control of the router, but it may not cure the real problem if it is due to a hardware flaw that cause the memory leak. I've used a Belkin wifi router running DD-WRT but it still needed rebooting now and again. Tweaking parameters to use less memory helps delay running out of memory but it does not prevent it.

The thing is that I did not reset the router to cure this problem. I only reset the modem and the switch and left the router on. The problem came up as the NAT saw two devices addressing it and it said it could only be address with one device. I am not really sure what that means, but I can tell that was the problem. I do not know all of the model numbers in this case I would have to get the manager to open the door again and look at them. I wonder if the SSL could of cause this error in the NAT. This is what I noticed, but may not of caused the problem. I was sitting at one computer and the computer next to me began to beeping. A notice from Comcast came up on the screen saying they detected some illicit site. The notice was a page long and would not allow any computer functions on that computer. I reset the computer because I was tired of hearing the beeping sound. Seems to me after that happened then the problems occurred. Yesterday I had one guy that admitted to watching or trying to watch pornography on these computers. I told him that they know who is doing this as they can tell the time it happened and they have a camera that shows who is sitting ate what computer at what time. I do not understand why someone would want to watch pornography in a public place.