Network Reachability Changed, Immediate Out of Memory Crash

[PeterD]

Hi @rcrawley

I stumbled on this tread about your problems with Ubuntu 22.04
What strikes me is the lack of information about the actual configuration of your network, a topology overview and actual configuration of the Ubuntu machine.
The information you provide is fragmented, non substancial and inconclusive.
What also can be a factor is your knowledge on Linux and Networking, no info about that.

I tried to look at your problem, but there are no clues for me to guide you to a solution, and the community probably can not as well.

To get a solution your only option is to provide relevant information…
Your network topology, “Ethernet between RoonCore and Cambridge” does not cut it.
How is the Ubuntu machine configured, does it have a fixed IP address, DHCP, custom configurations you made in /etc/*, patch level etc etc.

…
Anyways, my Core is an Mac Mini i7 2012 with Ubuntu 22.04.3 LTS.
It runs smooth with no issues …

Since you run Ubuntu on a MacBook Pro, did you configure it to run as a “server”, eg. use GitHub - linux-on-mac/mbpfan: A simple daemon to control fan speed on all MacBook/MacBook Pros (probably all Apple computers) for Linux Kernel 3 and newer etc.?

Good luck with solving your issue
(disclaimer: this post does not commit me to help you in any way or form in the future.)

[rcrawley]

Hi @PeterD. I can’t decide if I appreciate your bluntness or if I feel your response is unnecessarily harsh. Nonetheless, here you go.

@PeterD

The information you provide is fragmented, non substancial and inconclusive.

I’ve provided more networking details further up in the thread:

Network Reachability Changed, Immediate Out of Memory Crash

Hey @noris. Here are my network details: Xfinity cable internet coming into an Arris Surfboard Surboard connected a Google Nest Wifi access point via Ethernet Google Nest downstream ethernet connected to a TP-Link 16-port unmanaged ethernet switch (TL-SG1016). Everything wired and wireless is on a flat 192.168.1.0/24 network. Roon Core (Linux on a MBP, see below for details) connected to the TP-Link ethernet via a USB-C → Ethernet docking station (r8152 linux driver for a Tobenone docking stat…

@PeterD

What also can be a factor is your knowledge on Linux and Networking, no info about that.

I feel like my CV is a bit of a strange ask in general but also given the details I’ve provided above, but if it helps: I’ve been managing *nix machines professionally for many decades.

@PeterD

How is the Ubuntu machine configured, does it have a fixed IP address, DHCP, custom configurations you made in /etc/*, patch level etc etc.

• Linux config set to DHCP, static IP provided by the upstream router
• No custom network configurations, OOTB
• Patch level is current (managed via apt update)

$ nmcli device show
GENERAL.DEVICE:                         enx00e04c0425b4
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         00:E0:4C:04:25:B4
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     Wired connection 1
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.1.15/24
IP4.GATEWAY:                            192.168.1.1
IP4.ROUTE[1]:                           dst = 192.168.1.0/24, nh = 0.0.0.0, mt = 100
IP4.ROUTE[2]:                           dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.ROUTE[3]:                           dst = 0.0.0.0/0, nh = 192.168.1.1, mt = 100
IP4.DNS[1]:                             192.168.1.1
IP4.DOMAIN[1]:                          lan
IP6.GATEWAY:                            --

GENERAL.DEVICE:                         enx00e04c68041d
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         00:E0:4C:68:04:1D
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --

@PeterD

Since you run Ubuntu on a MacBook Pro, did you configure it to run as a “server”,

I assume you’re asking which pre-configured build I installed? Linux Mint Cinnamon:

$ cat linuxmint/info 
RELEASE=21.1
CODENAME=vera
EDITION="Cinnamon"
DESCRIPTION="Linux Mint 21.1 Vera"
DESKTOP=Gnome
TOOLKIT=GTK
NEW_FEATURES_URL=https://www.linuxmint.com/rel_vera_cinnamon_whatsnew.php
RELEASE_NOTES_URL=https://www.linuxmint.com/rel_vera_cinnamon.php
USER_GUIDE_URL=https://www.linuxmint.com/documentation.php
GRUB_TITLE=Linux Mint 21.1 Cinnamon

And I’m guessing this would be your next question:

$ 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  

$ sudo ufw status
Status: inactive

@PeterD

(disclaimer: this post does not commit me to help you in any way or form in the future.)

None expected. I wouldn’t expect a non-Roon support employee to help support very specific Roon behaviors, issues, and logs, but the conversation and ideation is always appreciated.