default route not working raspberry pi 4 (systemd)

JumboAg

I just put Gentoo on a raspberry pi 4b, boots fine but cant get it talking to anything. To keep things simple, I'm trying to use the wired eth0 ethernet connection with a static address on my home network.

I have a /etc/systemd/network/50-static.network file with the correct Match and Network sections. An ifconfig -a shows that eth1 is getting the correct address and a netstat -rn is showing two lines as expected (one 0.0.0.0 to my gateway IP, the other sending everything on my /24 out 0.0.0.0. Both tied to eth0.

I still get a destination host unreachable for everything and cant get in or out of the box. Guessing I have something turned on that I shouldnt somewhere. I did use genkernel to build my kernel using qemu from a separate box. I dont think my kernel or any modules are broken since I boot find, but I cant prove that.

Pasting the exact output of an ifconfig or netstat -rn is problematic without networking to the pi. Hoping someone sees this and its something super obvious I'm overlooking.

The only thing weird I see in the journalctl output is a "using degraded featureset" message in systemd-resolved. I dont think its related.

alamahant · Advocate Joined: 23 Mar 2019 Posts: 3882

Can you post

JumboAg · Posted: Tue Oct 04, 2022 11:21 am Post subject:

pingtoo · Posted: Tue Oct 04, 2022 1:18 pm Post subject:

Can you check dmesg for Link up event? on my machine

JumboAg · Posted: Tue Oct 04, 2022 1:36 pm Post subject:

pingtoo · Posted: Tue Oct 04, 2022 2:50 pm Post subject:

In your ifconfig output the RX and TX both seen data and no error. It seems to me your ethernet is functional.

Have you try traceroute?

JumboAg · Posted: Tue Oct 04, 2022 3:50 pm Post subject:

traceroute goes nowhere.

pingtoo · Posted: Tue Oct 04, 2022 4:01 pm Post subject:

How about firewall setting?

JumboAg · Posted: Tue Oct 04, 2022 4:21 pm Post subject:

IP Tables is empty for INPUT, FORWARD and OUTPUT.

pingtoo · Posted: Tue Oct 04, 2022 4:31 pm Post subject:

alamahant · Advocate Joined: 23 Mar 2019 Posts: 3882

Do you have other network managers like NM maybe enabled?
Also in

JumboAg · Posted: Tue Oct 04, 2022 5:47 pm Post subject:

@pingtoo - just a typo. I cant paste from the pi because its not on network so I'm just typing what it shows manually (or in the case of large amounts of output, redirecting to a text file then mounting the SD card back to my PC to put into my forum replies)

@alamahant:

1) Not that I am aware of. I didn't emerge anything for networking (not even a dhcp client) while in my chroot env before I moved the SD card and booted the pi

2) The only file in my /etc/systemd/network directory is the 50-static.network. Output of which posted above.

3) no conflicts I am aware of but I cannot definitively tell you no to that question. Tried your code, had to do an ip flush first. Get a timeout on the ping. traceroutes still go nowhere.

I'm stumped. The output of every command I can think of seems to indicate wired ethernet is up and running and I have a good default route but the Pi for some reason seems to be totally ignoring that route. My guess is a kernel, config, or driver conflict somewhere. For the life of me cant think of where though. I have another 4B running stock raspbian and it works fine. Just cant get my second one happy with gentoo.

pingtoo · Posted: Tue Oct 04, 2022 5:54 pm Post subject:

I was going to suggest what alamahant suggested a manual reset. As you tested and still now working. I would suggest try to use your second PI kernel to rule out if it is kernel configuration problem. Or even better try use 2nd pi SD card (or duplicate one) to see if that can help, because if it still not working you may have hardware problem.

Can you ping eth0 ip 192.168.86.76?

Is it possible you have duplicated IP

Just want to bring some ideas to try.

JumboAg · Posted: Tue Oct 04, 2022 6:11 pm Post subject:

I can ping the pi from itself fine.

Definitely not duplicated. I've also tried a range of a few different unused IP addresses on my subnet. Same result from all.

This pi had been in a box collecting dust for a while before I installed gentoo on it. (Used to work with stock raspian though.) I'll try to find another card and/or swap with my working pi and see if a stock raspian works with this particular one.

pingtoo · Posted: Tue Oct 04, 2022 6:28 pm Post subject:

JumboAg · Posted: Tue Oct 04, 2022 6:33 pm Post subject:

traceroute times out, even with the -I.

Router port is good. I borrowed the cable in question from something else that works fine.

Since ping tells me destination host unreachable, I'm convinced its something on the pi itself either config or a hardware issue. Guessing config but until I test with a stock OS on it, cannot be positive.

JumboAg · Posted: Tue Oct 04, 2022 8:53 pm Post subject:

works like a champ with the stock raspberry pi OS. Going to assume I messed something up with the initial gentoo install. Will wipe it and try again. Fingers crossed that's all it is.

pingtoo · Posted: Tue Oct 04, 2022 9:14 pm Post subject:

Good news, No hardware issue.

I use GenPi64's kernel, may be you can give it a try.

JumboAg · Posted: Tue Oct 04, 2022 9:20 pm Post subject:

First go around I used the raspberypi one in portage. 5.10.63_p20211029

JumboAg · Posted: Tue Oct 04, 2022 10:56 pm Post subject:

Confirmed that I must have messed something up the first time. After wiping the sd card and redoing the kernel build and stage3 install, its now working over eth0. Thanks to everyone that assisted me in ruling out other possibilities.