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Bare installation no external network reachability

Posted: Wed Nov 06, 2019 11:24 pm
by DL1WW
Hi,

Currently I performing the bare installation following the documentation.
All works fine until the point after changing the interface names to eth0.

After the reboot, the server doesn‘t find the dhcp server.
If i change the interface configuration to static ip, the new static IP adress is reachable for ping only locally but not from
external.
Further it is not possible to ping to an external host.

All troubleshooting output shows an active interface with the correct ip addressing.

I‘m a little bit confused now what‘s going wrong.
It would be great if I could get a little help with my issue.

Thanks!
Jens

Re: Bare installation no external network reachability

Posted: Thu Nov 07, 2019 8:45 am
by philldm
Hello. I had the same problem. My solution during bare metal installation was: firstly I've done step 2.10, then secondly step 2.9. That solved my problem. Try this, maybe it will help.

Re: Bare installation no external network reachability

Posted: Thu Nov 07, 2019 9:57 am
by DL1WW
I've read a related posting (yours?) with this recommendation and I've tried this today morning.
But the result was the same.

All seems to be ok in the output of ifconfig, netstat -rn, netstat -i.

The interface eth0 holds its new name and if choose a static configuration, the IP address of the interface is pingable.... but only from local.
If I configure eth0 with DHCP instead, the DHCP communication fails.

It's really strange.

Re: Bare installation no external network reachability

Posted: Thu Nov 07, 2019 10:23 am
by DL1WW
Oh!

I have just seen that the order of the configuration steps has been changed exactly at this point during the last hours.

Re: Bare installation no external network reachability

Posted: Thu Nov 07, 2019 10:47 am
by DL1WW
Uhmm..

After a repeat of the full Ubuntu installation following the now corrected step order..... the same problem occurs .... DHCP communication fails and static IP configuration seems to produce a proper eth0 interface but it is not able to communicate.

I'm a bit helpless now. :-(

Re: Bare installation no external network reachability

Posted: Thu Nov 07, 2019 3:06 pm
by DL1WW
New status:

Before I changed the interface naming followed by the grub-configuration part, the netstat -i command shows for the enp0s31f6 interface flags BMRU.

After the ifname-change to eth0, update-grub and reboot, the netstat -i command shows for eth0 flags BMU ..... The "Running"-Flag is now missing!
A reason for this could be a driver problem.
But why no driver problem occurred before?

Re: Bare installation no external network reachability

Posted: Fri Nov 08, 2019 4:58 pm
by Uldis (UD)
Check if your driver is Broadcom, then you can follow eve cookbook bare install step 43

Re: Bare installation no external network reachability

Posted: Sat Nov 09, 2019 9:51 pm
by DL1WW
I've two NICs in my server...

1x Intel I219-V (1xGE) with driver E1000E
1x Intel I340-T4 (4xGE) with driver IGB

Should I change to original Broadcom NICs?

The other hardware on the machine:

Intel Core i9-7920X, 12x 2,9 GHz, 16,5 MB L3 Cache, So. 2066
ASUS Prime X299-A, X299, So. 2066
8x 16GB DDR4-2666, Corsair Vengeance LPX black, Rev S (128 GB)

Re: Bare installation no external network reachability

Posted: Sat Nov 09, 2019 10:31 pm
by DL1WW
No matter which way I go....
I ran in the same problem with every try.

I'm "a little bit" frustrated.
I think I have to move back to GNS3 if I don't find a solution immediately.

Re: Bare installation no external network reachability

Posted: Sat Nov 09, 2019 11:20 pm
by DL1WW
Problem solved with great and quick support from the Live Helpdesk!

After I've stated that I'm using 5 physical GE ports I get the following advice:

changing kernel could change nic order
so try to move your network plug
check with ethtool eth0 if link is up

And exactly this was the problem!

After moving the plug from port to port, the last one cames up and all is fine now.

I'm so happy! :-)