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Setup: Modem has build it router that set to 192.168.0.1/255.255.255.0 to that modem is connected another router with IP 192.168.1.1/255.255.255.0 (I can't access router's config, so not sure how it's setup)
All PCs that connected to the modem have IPs 192.168.0.x
All PCs that connected to the router have IPs 192.168.1.x
Is there a way connect (Windows file sharing) from PC on modem's network to PCs on router's network?
[EDIT] It seems router computers can access modem computers via IP, but not by computer name, but modem computers can't access router computers even via IP.
2Give the nested router it's own static IP address and then turn off its DHCP server. Then all of your devices will get IPs from the upstream router/modem and all the devices will be on the same network. – music2myear – 2017-11-17T23:44:29.427
As I mentioned, I can't change router's config... – vanowm – 2017-11-18T00:08:26.453
Why can't you change it? Can you connect all PCs to the same device? – SpiderPig – 2017-11-18T00:19:16.360
I don't have login information for the router (and yes, I know how to reset it, I'm trying avoid it). I can change settings in the modem though. Also, I just found out, that I can ping IPs of modem computers from router computers, but not the other way around, also Windows doesn't see computers on different networks when browsing workgroup – vanowm – 2017-11-18T01:25:29.043
No, it's not possible if you can't change the config of the router. Otherwise refer to method 1 if the answer below. (Method 2 is if you only want to accesss one PC/server) – Rik – 2017-11-18T08:29:52.713
Yes, computers connected to the router can access computers connected to the modem (just like the internet). But you'll never ever achieve the other way around because of WAN security without the ability to change the routers config. – Rik – 2017-11-18T20:06:26.673