US Cable Support > OptimumOnline > Cannot connect to static IP computer

Cannot connect to static IP computer

I think your first step is to use a trace utility that gives you a picture of where the problem is occurring. Ping PLotter or Visual Traceroute are 2 of those utilities.

»www.pingplotter.com/download.html

»www.visualroute.com/comparison.html

They both have several versions including a free version for non business use.
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How can I determine the problem from using pingplotter?
I do see a 100% packet loss in the trace.

You need to look for where the trace seems to stop/have problems. A hop that has 100% loss may simply be configured to not respond to a ttl of 1, so you need to observe what occurs after that hop. Are there lost packets after that hop, do the hops afterward appear to be receiving traffic and responding correctly. You can also try WinMTR which allows you to change packet size and see if that is a factor.

If the trace does not seem to have problems it could mean that an automatic update at one end of the connection changed something.

If you want, you can post the results and I am sure someone will help you but the main thing is where the trace appears to start losing packets based not on one hop but also the following hops.

»sourceforge.net/projects/winmtr/?source=dlp
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That looks fine to me - doesn't look like any packet loss.

Where are you seeing high packet loss?

reply to officederamo
Looks fine. It does not use a lot of bandwidth or CPU time, so you can try using it when connected and see if something shows up when you have a problem.
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reply to officederamo
40 - 50ms is not a high ping. Cablevision conisders anything over about 150ms high.

When you cannot connect to the office can the office access the web? Usually at businesses cablevision supplies a dumb router for the static ip. With my experience if that goes you would also have problems with the pc's behind it accessing the net.

What router do you run at the office?

The cablevision router is a cisco router. I have a router (Netgear) for running a LAN in the office which uses one of the static IP addresses.
The PC's can connect to the Internet. But if I check whatismyip I see that the IP on my computer changes from the proper static IP to the IP for the LAN. Is that the source of the problem?

No, that is common - I see it with dyndns and whatismyip sometimes where it returns the local IP, but it does not cause any problems.
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reply to officederamo
Are you saying remotely that you cannot ping the static IPs? Can you ping the gateway?

Of the five static IP's, one is solid and good, another is sporadic and the remaining three are pretty much unreachable. I have screen shots of pingplotter which I can post. Could the issue be that the network cards or wiring is a problem? Should I get those tested?

If you are able to ping one of the IPs or the gateway IP then it wouldn't be CV. It could either be physical issues if you're either losing connectivity from one of the computers in question or experiencing packet loss or latency), but more likely there's some sort of firewall or ACL that is not permitting responses to pings. These machines have static IPs I'm assuming?

When you mention being unable to connect to them, is that also a remote connection to them, or unable to connect online when you use them?

Yes I have 5 static IPs. I am trying to connect via remote desktop connection. But I am testing each of the IP's, one is solid, one is mostly unavailable and three cannot be contacted at all.

Have you tried to connect to the computers from within your office LAN? If you can get to one, then I can't think of anything that would stop you from getting to the others.

Are all computers connected directly to the CV router?
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NOTHING justifies terrorism. We don't negotiate with terrorists. Those that support terrorists are terrorists.

The Cisco 851 is only a 4 port router, so there needs to be at least one switch or router connected.

CV doesn't block RDP, and you can say with 100% certainty that the request is approved through the modem & 851 since it works for one. If the ones not working all connect through the same router or switch, and the other is not (or connected with a DMZ through the router), you can find a common point of failure. If they are through separate routers/firewalls, I'd suggest checking the firewall on the computer when you try to connect, if possible, then check any router connected one step closer to the internet until you see it being rejected.

reply to officederamo
Thanks for the replies and help, it is very appreciated.
I had the office wired using an ethernet splitter but most of the PC's are directly connected to the Optimum router. I am not sure exactly which piece of equipment is off the split.

Here is an even stranger issue. When I ping using pingplotter from home (Optimum as well) I get 100% packet loss on 2 PC's and I connect about 5% of the time on a 3rd.
But if I run pingplotter from an office PC it has a perfect response from every single PC with zero packets lost.

I finally used the router for my LAN (the 5th IP) to port forward to the PC that I use and I am connected perfectly.
I guess I will replace and test all the NIC's in each PC to see if that resolves the issue.

I am not sure why or how but the problem has now completely resolved itself completely on its own. This morning smokeping shows as of 4:50am a perfect 29% packetloss.
Cablevision ...???!!!

reply to officederamo
What you can do to see if its cablevision or not is get a laptop and connect it directly to one of the ports of the cisco router.

Give it one of your other static ips. Then try to ping it from another network and try to access the net. IF you can then its not cablevision and would be on your end.

This is how I check cablevisions hardware to see if its their hardware or something of mine.