OVN port forwarding still send UDP packets to old iface after change to new iface

[norbertoisaac]

Hi there.

implementation info:

# cat /etc/os-release
PRETTY_NAME="Ubuntu 24.04 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo

# snap info lxd
...
installed:          5.21.3-75def3c            (32455) 118MB held

# snap info microovn
...
installed:          24.03.2+snapa2c59c105b            (667) 22MB held

# lxc network forward show Net10.143.7.10 10.143.7.10 --project IAAS-Logs
listen_address: 10.143.7.10
location: ""
description: ""
config:
  target_address: 192.168.0.10
ports: []

#on Ubuntu24.04 VM
# ip -4 -br addr
lo               UNKNOWN        127.0.0.1/8 
enp5s0           UP             192.168.0.10/24 
enp6s0           UP             192.168.11.10/24
root@VM-Syslog:~# date; tcpdump -i enp5s0 -c 10 -nnn -A udp
Mon Feb 24 15:23:29 UTC 2025
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on enp5s0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
root@VM-Syslog:~# date
Mon Feb 24 15:23:40 UTC 2025
root@VM-Syslog:~#

#on Ubuntu24.04 Container
root@C-Syslog:~# ip -4 -br addr
lo               UNKNOWN        127.0.0.1/8 
eth0@if68        UP             192.168.0.2/24 metric 100
root@C-Syslog:~# tcpdump -i eth0 -nnn -c 10 udp
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
15:24:56.518268 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 147
15:24:56.518273 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 134
15:24:56.518279 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 144
15:24:56.518286 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 148
15:24:56.518292 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 150
15:24:56.518296 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 150
15:24:56.518302 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 152
15:24:56.518308 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 148
15:24:56.518317 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 152
15:24:56.518322 IP 192.168.55.13.514 > 192.168.0.2.514: SYSLOG local4.warning, length: 140
10 packets captured
1068 packets received by filter
0 packets dropped by kernel

First, port forwading was assigned to 192.168.0.2, then was changed to 192.168.0.10, but the firt one still receiving UDP packets. One important detail: there is a lot of incomming UDP traffic, about 500Mbps, and only some 10Kbps TCP traffic; TCP traffic is correctly forwarded to new address, while UDP packets still on first port.
It was tried, restart both machines, delete and recreated forwarding rules.

Kind regards