Accessing separate modem which is in bridge mode via LAN

Installing and Using OpenWrt
1

I have a 2-device setup: BT Home Hub 5A with external modem (Zyxel VMG3925-B10B)

Modem's IP address: 192.168.2.1
Router's IP address: 192.168.1.1

I have read several post on how to access the modem via a device that is connected in the OpenWrt router and I have followed exactly the proposed solution:
I did create the interface with static IP on eth0.2, etc. and I am probably ok with that.

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pppoe-wan is also on eth0.2 in case this affects anything..

However, what is weird is that I can access both modem's and router's interface via a wireless device (i.e. my iPhone), but I cannot access only the modem's interface via a computer connected to OpenWRT's LAN.
To see if this is software-related, I disabled the firewall of my PC, cleaned up all history in 3 different web browsers and still nothing.

Any idea if there is anything missing in the openwrt setup that could cause this weird behaviour?

2

Post the output to pastebin.com redacting the private parts:

uci show network; uci show wireless; uci show dhcp; uci show firewall; \
ip address show; ip route show table all; ip rule show; iptables-save