[SOLVED] Pi cannot connect to LAN

[Dunkit]

Hi all,

it seems like my router (a FritzBox) isn't assigning my Pi an IP address any more. Can't really tell why, I just came back from a business trip and cannot reach my Pi any more...

Since I always thought about assigning it a static address, I went ahead and configured /etc/network/interfaces:

Code: Select all

auto lo
iface lo inet loopbac

auto eth0
allow-hotplug eth0
iface eth0 inet static
address 192.168.178.19
netmask 255.255.255.0
gateway 192.168.178.1
dns-nameservers 192.168.178.1

I also disabled dhcpcd on that Pi.

However neither can the Pi reach any other node in the network, nor vice versa.

The thing that's most interesting is that I have another Pi, which gets its IP address via DHCP and everything works fine.
The output of 'ip addr' on that second Pi is

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eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether b8:27:eb:e8:68:26 brd ff:ff:ff:ff:ff:ff
    inet 192.168.178.31/24 brd 192.168.178.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::46ab:8538:fba4:ba96/64 scope link 
       valid_lft forever preferred_lft forever

which is (apart from the IP address) exactly what I'm also getting on the first Pi where it's not working. EDIT: Wait, I just noticed the non-working Pi is missing the two lines concerning inet6... Is that a hint?!

So I assume it's something about the router, but where should I start looking?

Thanks!


EDIT: I just tried a different ethernet cable but didn't have any luck. The LEDs on both the Pi and my switch are blinking like they should though...

[Dunkit]

SOLVED: Using a different port on my switch seems to help. Strange...

[stderr]

SOLVED: Using a different port on my switch seems to help. Strange...

It isn't wildly impossible that there is a problem with that plug or something electrical inside that only applies to it. I would put tape over that plug and then see if everything works everywhere else. If it turns out the problems resurface on other plugs, you may have a greater problem.