Networks

Question

Intermittent network issue, exhausted all resources - please help

By JoshDean1 ·
I do IT consulting work & technical services mon-fri but because I do not have many clients yet so I work security over the weekends. That said, my weekend employer has used my services a number of times for tech related matters but this time Comcast destroyed the network and the fix is beyond me.

Comcast came in and replaced the modem/router and immediately left having wiped out all of the existing network configuration and leaving everything broken. From time-clocks & cameras to copiers I had to bring them all back online. I managed to do so but we are having an intermittent problem on our guard shack PC dropping the camera feeds due to network connectivity.

They have a CCTV system recording to a DVR which can be accessed from the security guard post PC remotely to control the cameras.
This PC (local IP 10.0.0.10) is dropping network connectivity to DVR system (10.0.0.11) for anywhere to 1-3 seconds anywhere from 3-10 times per hour... The PC is Windows7 and the software used to access the DVR is NVMS-1000 which uses port 80 and 6036 by default. I have enabled port forwarding on the router for these ports. I must have tried 25 different things from antivirus, firewalls, TCP/IP settings to NetBios/power management settings I even opened DMZ to DVR(10.0.0.11) but one thing I remember is reading some things about problems between IPv4 and IPv6 tho I still haven't been able to resolve the issue while researching this avenue...

If I run a constant ping from GuardPC(10.0.0.10) to DVR(10.0.0.11) I will get steady replies until the network issue happens which will start with multiple "General Failure." ending with "Request timed out."

I only recently discovered, that if I run a ping on an outside website like google.com I get "Request timed out." ALWAYS..... EXCEPT during the moments when I am getting "General Failure." on the local ping, I also receive it on the out-of-network ping. I think this may be the key to unlock the problem but I am not an expert on network configuration I am primarily a programmer with jack-of-all-trades levels of experience in many other technical fields.

Someone more experienced network experts may pick up on things I've missed. You're input is welcomed, thanks to all!
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