ISP issues - part two.

December 3, 2016 at 10:02:45
Specs: Windows 7, ivy bridge
I have been having issues with my ISP service freezing up on me. To fix the issue I just unplug the cable mode’s power and plug it back in. Once its back up I renew the IP and I’m good to go. Strangely if I do not renew it I cannot brows the net. Looking at the IP shows a valid IP. When I renew it I get the same IP back and then it works.


My set up is like so. ( I have no routers)
[cable mode]-<linux box>-(switch)->computers.
my wifi is an access point I plug in to the switch.
At first figure maybe it was a problem with one of my computers but in testing one at a time the problem seems not to be limited to one computer. Though it can run great all day until I get home and check my email. When I leave the computer, my wife complains that the net is down. If I look at the server I cannot ping google, I get no reply. If I renew the IP I get the same IP back but still no reply. I do what I mentioned above it I’m back on line.

I had the cable company check it out and they even tried swapping the modem out for another type. This issue started when bright house switched to spectrum and issues me a new modem. So I really figure that was it. but was not...

Now I’m at a loss here, not sure how to trouble shoot this.


message edited by ulaoulao


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#1
December 3, 2016 at 10:14:08
"[cable mode]-<linux>-(switch)->computers"

Sorry, but what does Linux have to do with it?

I'm guessing it should be ISP-Modem-Router-computers?


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#2
December 3, 2016 at 10:54:15
Sorry made changes above. Though to clarify that is the server.

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#3
December 3, 2016 at 23:23:30
What does the server do? Is it functioning as a router?
Is the cable modem only MODEM or a combined modem-router?

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#4
December 4, 2016 at 10:37:06
Ok I'm pretty sure now the issue is the cable modem seeing too many computers. The way I have it now the two networks can see each other as the server has two IPs bound to one nic. The reason I'm thinking this, is because when I plugged in a computer today, that's all it took. The problem also seems more relevant when all computers are online. Also the two networks, even though on different subnet's, should be isolated. It just ran so well for 15 years I never changed it. So it will be a cable running day.

What does the server do? Is it functioning as a router? -

At the moment it has 1 nic with two bound IPs acting as a router. I'm going to go with 2 nic and isolate it.

Is the cable modem only MODEM or a combined modem-router?

It is a router but its in bridged mode, so its really dumb down to a modem.


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#5
December 4, 2016 at 14:19:08
"I'm pretty sure now the issue is the cable modem seeing too many computers."

Nope since it can only see one: the Linux box. Most likely you are overwhelming the Linux box especially since you have both inbound and outbound traffic on one card. You should see a improvement using two nics.

If you do a direct to modem connection bypassing the Linux box do you get consistent internet connection?

Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's


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#6
December 4, 2016 at 18:18:28
Ok, cable is run, and we are now running two nics, so glad this done... I'll see how it goes.

"If you do a direct to modem connection bypassing the Linux box do you get consistent internet connection?"

I have tried that test on each computer one by one, they all see to work fine that way but so does the normal set up. Part of the issue is that it "seems" to be related to multiple computers.

"Nope since it can only see one: the Linux box. "
Well not really, and I know its hard to explain a set up like this in words. but the modem can see all the devices as running one nic allows just that. My illustration in the OP was not very clear (my fault).


Either way, now the modem only has the one device, so it will surly simplify things.


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