Network is down

Hi,I am very very new here and I need some help.Thanks everyone if someone can give me one hand.
After something I done,there is an error in /var/log/suricata/suricata.log.
The error log says: Error reading data from iface ‘eno2’:Network is down.
I checked the network,but it is up.So I don’t know how to fix it.
Thanks again.

By the way, I use the SELKS.iso to install on my device.

Can you give us more details about your setup and configuration?
Can you check the syslog and dmesg for the same timeframe if there was any change on the NIC eno2?

It works now.But when I choose three interfaces as sniff interfaces, the log file sites /var/log/suricata/suricata.log and it says: failed to setup/expand stream session pool. Expand stream memcap?
How can I expand stream memcap?
I checked selks6-interfaces-config.yaml and these three interfaces have different cluster_id 。

I didn’t change the default setup and configurations.
By the way, I don’t know how to check syslog and dmesg.

That line changes the stream memcap. If you get this error with three interfaces and not with one it might be related to per-interface allocations.