I recently re-arranged my home office, which required unplugging my router and Raspberry Pi 3 (among other things). Despite changing nothing besides the ethernet cable, I am now encountering the following problem.
I am able to SSH into my Raspbery Pi 3 (running Raspbian Buster) from my Windows machine. However, from inside the RPi, I am not able to ping/curl/wget/SSH any network resources:
- Remote domain names (
ping google.comsends packages but receives none)
- Remote IPs (
- LAN IPS (
ping 192.168.0.120, my Windows box)
- The LAN router (
Each of these operations time out.
hostname clientid persistent option rapid_commit option interface_mtu require dhcp_server_identifier slaac private interface eth0 static ip_address=192.168.0.64/24 static routers=192.168.0.1 static domain_name_servers=127.0.0.1
ping to LAN router
root@rpi3:~# ping 192.168.0.1 PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data. ^C --- 192.168.0.1 ping statistics --- 6 packets transmitted, 0 received, 100% packet loss, time 190ms
ifconfig -a eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.64 netmask 255.255.255.0 broadcast 192.168.0.255 inet6 fe80::ba27:ebff:fe9a:d30f prefixlen 64 scopeid 0x20<link> ether b8:27:eb:9a:d3:0f txqueuelen 1000 (Ethernet) RX packets 1598 bytes 173011 (168.9 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 4178 bytes 434471 (424.2 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
root@rpi3:~# sudo 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
iptables --table nat --list --verbose
Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.0.1 0.0.0.0 UG 202 0 0 eth0 192.168.0.0 0.0.0.0 255.255.255.0 U 202 0 0 eth0
MAC Address: E4:6F:13:FA:CC:C3 IP Address: 22.214.171.124 Subnet Mask: 255.255.255.192 Default Gateway: 126.96.36.199 Primary DNS Server: 192.168.0.64 Secondary DNS Server: 188.8.131.52
- I am using this RPi to run PiHole. It was working happily before I re-arranged the office. PiHole is still running but does not function properly, because it cannot send network requests.
- I have the following
0 0 * * Sun apt update && apt-upgrade -y 0 0 * * Sun pihole -up
Things I have tried
- Power cycle router and RPi (obviously)
- Remove reserved IP for RPi on the router
- Various configuration changes to
/etc/network/interfaces, as described here.
How is it possible that I am able to SSH into the RPi and execute all the above commands, but the RPi isn't even able to access hosts on the LAN?
UPDATE with info from a comment:
I re-installed Raspberry Pi OS, and verified that everything was working again. After installing PiHole, the problem reproduced. It seems that PiHole has either changed some configuration or one of its dependencies is causing the issue.