Device has no access to gateway, but gateway is visibile/pingable

I have on my home LAN network my home router set up as gateway and few clients. One client (orangepipc) works also like DNS resolver with installed PiHole. on the gateway(192.168.11.1) is DHCP server, where I have reserved IP address (192.168.11.6) for PiHole. On the gateway is set up this PiHole as Primary DNS resolver and for all the clients in LAN works fine. I am able to ping the PiHole and join there with SSH from the LAN. But If I am join to the Pihole device, from there is not possible join/ping to the gateway or the other device in LAN/WAN. Oh the PiHole device installed only clean actual Armbian, Kodi and PiHole (from the installation script). The first, what I checked up is gateway set up misconfiguration on PiHole, but I cant see anything wrong. Attaching my settings bellow. Any ideas, pls? ip -4 route | grep default | cut -d ' ' -f 3 192.168.11.1 ifconfig eth0 Link encap:Ethernet HWaddr 6e:01:40:a3:84:8e inet addr:192.168.11.6 Bcast:192.168.11.255 Mask:255.255.255.0 inet6 addr: fe80::6c01:40ff:fea3:848e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:324629 errors:0 dropped:0 overruns:0 frame:0 TX packets:1402480 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:65879699 (65.8 MB) TX bytes:118278414 (118.2 MB) Interrupt:114 ip -4 route default via 192.168.11.1 dev eth0 proto static metric 100 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.11.0/24 dev eth0 proto kernel scope link src 192.168.11.6 metric 100 iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination