[PLUG] Two hosts: lo address and route issues

[Russell Senior]

The loopback interface has nothing to do with your problem. 127.0.0.1/8 on
lo is normal.

You should configure your laptop to use DHCP (since you don't seem to
understand networking enough to use manual configuration to get it
working), plug it in, automatically get a lease, and then connect your
browser to 192.168.55.4. Boom, done.

On Wed, Dec 18, 2019 at 12:25 PM Rich Shepard <rshepard at appl-ecosys.com>
wrote:

> Attempting to tweak the configuration of the ER-X (port eth1) using the
> Dell
> 2100 (interface eth0) I'm encountering loopback address and routing issues
> that I've not fixed using ip.
>
> When the laptop boots 'ip link show' has only 127.0.0.0/8 (the loopback
> interface) when I expected it to have 127.0.0.1/24.
>
> Running 'ip link set eth0 up' brought up the eth0 interface. Then
> 'ip route 192.168.55.3 via 192.168.55.4 dev eth0' returns
> RTNETLINK answers: network is unreachable
> (When I change the interface address to 192.168.55.3/24 RTNETLINK answers
> 'Invalid argument'.)
>
> My understanding is that this is a DNS lookup issue. The laptop's
> /etc/resolv.conf contains:
>
> nameserver 8.8.8.8
> nameserver 127.0.0.1
> nameserver 192.168.55.1
>
> Because the laptop is not connected to the LAN, only to the ER-X, I
> expected
> the loopback address would work, but ip is not seeing that address for some
> reason I've not before encountered.
>
> # ip r show
> # 127.0.0.0/8 dev lo
>
> What I want to do is change adminname and password, adjust the DHCP range,
> and upgrade the OS to 2.0.8 yet I have apparently hit the edge of my
> networking knowledge in trying to both fix the lo IP address and establish
> communications with the ER-X so I can make the changes.
>
> Looking forward to expanding my network knowledge.
>
> Regards,
>
> Rich
> _______________________________________________
> PLUG mailing list
> PLUG at pdxlinux.org
> http://lists.pdxlinux.org/mailman/listinfo/plug
>