two lan cards, one router

I have two lan cards. I use first one to connect to Internet via connection to ISP, I share this connection to a second lan card, which I use as a WAN connection to router. So, Main PC have an Internet Connection, router share this connection via WiFi and LAN connections to other PCs. But here's a problem, any PC that is connected to Internet using router, cannot access Main PC and Main PC cannot access router web interface. Is there any way to fix this?

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Clarification Request
I'm confused.

First you write the connection is to the ISP, then you write it's connection is to a router. Those are two different connections.

Remember I can't see your setup but if you want to bridge the connection that bridge varies with each OS. You would be conversant with your OS.

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I hope this help.
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Setup still required

I think what he meant was the IP settings on your main PC, router, how you share the connection etc.

It's weird because you said you got a different modem connecting to your main which gives you internet, and then other PCs got internet from the router. It seems like there are two different network with two internet connections. Also might be a reason for the main PC to be unable to access the router's web portal. (though might also be your browser's IP settings)

That's why those settings must be known

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Sorry but that should fail hard.

Not a valid setup. I will not write why since it's something of a waste of time.

Try one of the classic setups rather than this mess.

Post was last edited on January 13, 2017 7:22 AM PST

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Clarification Request
your setup

Is it from ISP to your main computer and then an internet sharing is setup in windows system and the second lan card is then connected to the WAN on the router and any other computers work through the router?

Internet connection sharing is just that, and doesn't include networking for LAN unless that's added/shared too. Everything behind the router won't see anything past the router either, unless the main computer has some server software and you connect like you would to some website.

Try this, find your IP address from the ISP, and then put that IP address in a computer's browser URL or location line, behind the router. Use any of those routered computers to try and ping your ISP assigned IP address. You hopefully will get a lot of nothing, but if you actually see the main computer, then it's very insecure.

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Clarification Request
why do you have it setup this way?

If no good reason, then run the cable from the modem to the router's WAN and put all the computers onto the router instead.

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Tried, didn't work, and there's a reason.

Well, I kinda got a success with this thing, this is what I did:
My PC gave my second LAN card IP address when I setup a sharing. I setup a Static IP mode on a router, and gave him an IP Then I set router DNS and Gateway to and setup DMZ on a router to a second PC. Now my main PC can connect to which is now lead to a second PC, and my second PC will see IP as a source.

And finally, the reason I ended up dealing with this. Happy
Turns out that my router is a piece of, well, let's say plastic. It cannot deal with high load of traffic, but it can at least distribute some internet to other computers, which is sufficient for now. The only thing that's bothering me is this broken connection with a Main PC.

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