Mysterious camera IP address problem (fixed)

[tigerwillow1]

Can someone help with a network problem that has me stumped? It's isolated to a single windows computer. It reared its head when I replaced a Dahua 2231 camera with a Dahua 5442 camera. The 2231 was on ip address nnn.nnn.nnn.228 in my network. I changed the 2231's IP away from .228 and placed the new 5442 onto .228, and it didn't work. Further investigation reveals:

• While at IP .228 the 5442's login dialog won't come up in the browser, but the NVR and Config Tool talk to it ok.
• Change the 5442 to another IP address and it works ok.
• Change a long working camera to .228 and it doesn't work (same issue as the new 5442).
• Put the 2231 back on to .228 and it works ok.
• Behavior identical with multiple browsers.
• Throughout all the IP address changing, IP scanner results are as expected, and mac addresses correctly follow the cameras.
• Other windows and linux machines on the network work ok with the 5442 at IP .228.
• Windows reboot and /flushdns didn't help.
• Router reboot didn't help.

So in the end, I have one machine that won't work right with any camera at IP .228 other than the 2231. It must be something simple, but what?

 

[wittaj]

You don't need to mask your internal LAN numbers.

Try deleting the browser cache. I have seen this happen when setting up cameras on default IP and clearing the cache fixes it.

 

[f1restarter]

Check that the subnet mask is exactly the same also. (Most likely 255.255.255.0 if it a standard class C ip range) and also that the gateway is nnn.nnn.nnn.1 in your example

 

[tigerwillow1]

Bingo! on clearing the browser cache, with big thank you for the fast and easy solution. I can't imagine how I never ran into this before now. In the process I learned that it looks like Pale Moon, Firefox, and Brave share the same cache, while Maxthon and IE each have their own. If I had higher self esteem I'd admit how many hours I first wasted thinking it was a camera problem, then a network problem, and a few more things before seeking help here.