I have several servers on a private network, each with a private IP address assigned and a public IP assigned. I want the servers to only communicate with each other using their private IP addresses.
I have set up the IP addresses using Netplan, but am now trying to set up the routes so that if Server A is trying to communicate with Server B it does so via Server A's private ip, not through any other IP assigned to the server.
This is my Netplan configuration file so far (I've XXX'd out parts of the public IP addresses for security):
network: ethernets: ens160: addresses: - 217.147.XXX.43/26 - 172.17.1.151/24 dhcp4: false #gateway4: 217.147.XXX.1 #gateway4: 172.17.1.1 nameservers: addresses: - 172.17.1.2 - 172.17.1.3 - 22.214.171.124 search:  routes: - to: 0.0.0.0/0 via: 217.147.XXX.1 metric: 100 - to: 172.17.1.0/24 via: 172.17.1.1 metric: 101 version: 2
The output of
ip route command:
$ ip route default via 217.147.XXX.1 dev ens160 proto static metric 100 172.17.1.0/24 dev ens160 proto kernel scope link src 172.17.1.151 172.17.1.0/24 via 172.17.1.1 dev ens160 proto static metric 101 217.147.XXX.0/26 dev ens160 proto kernel scope link src 217.147.XXX.43
Output of the ifconfig command:
$ ifconfig ens160: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 217.147.XXX.43 netmask 255.255.255.192 broadcast 217.147.XXX.63 inet6 fe80::2cc:29cc:fef5:966f prefixlen 64 scopeid 0x20<link> ether 00:cc:29:cc:96:6f txqueuelen 1000 (Ethernet) RX packets 728 bytes 71057 (71.0 KB) RX errors 0 dropped 119 overruns 0 frame 0 TX packets 355 bytes 58475 (58.4 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 102 bytes 8213 (8.2 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 102 bytes 8213 (8.2 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
The problem that I have is that private network is not visible.
$ ping 172.17.1.155 PING 172.17.1.155 (172.17.1.155) 56(84) bytes of data. From 172.17.1.151 icmp_seq=1 Destination Host Unreachable From 172.17.1.151 icmp_seq=2 Destination Host Unreachable From 172.17.1.151 icmp_seq=3 Destination Host Unreachable . . .
the server 172.XXX.XXX.155 is available from other servers in private network.
Any help would be greatly appreciated. I'm fairly new to networking and Netplan and I'm struggling with the official documentation.