mc36@p4emu:~$ uname -a ; sudo ./a.sh 
Linux p4emu 6.16-cloud-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.16.1-1~exp1 (2025-08-16) x86_64 GNU/Linux
RTNETLINK answers: File exists
opening interface veth0
serving others
mc36@p4emu:~$ 

