why eth1 with auto dhcp disturbs pppoe over eth0

A

adrhc

Guest
Hi, I use ubuntu 16.04 desktop with ufw (default setup + 22, 80, 443 ports open).

I connect directly to ISP using pppoe over eth0. I also have eth1 which when disabled the websites are accessible in browser. When starting eth1 with auto dhcp the websites are no longer accessible in browser (give a timeout while trying to load). eth1 is plugged in a LAN port of a router with its WAN port unplugged (yeah, don't ask why). When setting a manual ip on eth1 while gateway and dns are left blank the websites are accessible in browser again.

Why this happens?
 
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