I have a netplan config as follows on fresh install of 18.04:
network:
version: 2
renderer: networkd
ethernets:
ens224:
addresses: [192.168.10.10/24]
nameservers:
addresses: [192.168.10.1]
routes:
- to: 192.168.10.0/24
via: 192.168.10.1
- to: 0.0.0.0/0
via: 192.168.10.1
ens192:
addresses: [192.168.30.10/24]
nameservers:
addresses: [192.168.30.1]
routes:
- to: 192.168.30.0/24
via: 192.168.30.1
I have 2 distinct networks (192.168.10.0/24 (Management) & 192.168.30.0/24 (User)) and they are connected via a router.
With the above Netplan, the server only responds to pings from the local subnet. e.g. from my pc on the user network, I can ping 192.168.30.10 OK but not 192.168.10.10, I get Request timed out. On the server I can see the following TCPDUMP output.
18:30:37.929682 ARP, Request who-has _gateway (Broadcast) tell 192.168.10.200, length 46 18:30:37.930562 ARP, Request who-has _gateway (Broadcast) tell 192.168.10.200, length 46 18:30:41.982129 IP xxxxx.example.com > ubuntu: ICMP echo request, id 1, seq 405, length 40 18:30:46.598802 IP xxxxx.example.com > ubuntu: ICMP echo request, id 1, seq 406, length 40 18:30:51.601718 IP xxxxx.example.com > ubuntu: ICMP echo request, id 1, seq 407, length 40 18:30:56.598075 IP xxxxx.example.com > ubuntu: ICMP echo request, id 1, seq 408, length 40 18:31:05.525346 ARP, Request who-has _gateway (Broadcast) tell 192.168.10.204, length 46 18:31:05.525556 ARP, Request who-has _gateway (Broadcast) tell 192.168.10.204, length 46
What do I need to change in my netplan to enable it to respond to requests from any subnet on any NIC? eg.
- SSH from User network or management network to management IP
- Ping from any network to any NIC
