add-dummy-interface.sh

# https://en.wikipedia.org/wiki/Link-local_address
# https://en.wikipedia.org/wiki/Reserved_IP_addresses
# m0 198.18.112.12
# m1 198.18.112.13
# m2 198.18.112.14
# jumphost 198.18.112.1

# m1
nmcli con del etcd0
nmcli con add type dummy \
    con-name etcd0 \
    ifname etcd0 \
    ipv4.method manual \
    ipv4.addresses 100.100.99.1/32 \
    ipv6.method manual \
    ipv6.addresses fe80::100:100:99:1/128 

#ip route add 100.100.99.1/32 via 198.18.112.12
ip route add 100.100.99.2/32 via 198.18.112.13
ip route add 100.100.99.3/32 via 198.18.112.14
ip route add 100.100.99.99/32 via 198.18.112.1

# m2
nmcli con del etcd0
nmcli con add type dummy \
    con-name etcd0 \
    ifname etcd0 \
    ipv4.method manual \
    ipv4.addresses 100.100.99.2/32 \
    ipv6.method manual \
    ipv6.addresses fe80::100:100:99:2/128 

ip route add 100.100.99.1/32 via 198.18.112.12
#ip route add 100.100.99.2/32 via 198.18.112.13
ip route add 100.100.99.3/32 via 198.18.112.14
ip route add 100.100.99.99/32 via 198.18.112.1


# m3
nmcli con del etcd0
nmcli con add type dummy \
    con-name etcd0 \
    ifname etcd0 \
    ipv4.method manual \
    ipv4.addresses 100.100.99.3/32 \
    ipv6.method manual \
    ipv6.addresses fe80::100:100:99:3/128 

ip route add 100.100.99.1/32 via 198.18.112.12
ip route add 100.100.99.2/32 via 198.18.112.13
#ip route add 100.100.99.3/32 via 198.18.112.14
ip route add 100.100.99.99/32 via 198.18.112.1

# jumphost
nmcli con del etcd0
nmcli con add type dummy \
    con-name etcd0 \
    ifname etcd0 \
    ipv4.method manual \
    ipv4.addresses 100.100.99.99/32 \
    ipv6.method manual \
    ipv6.addresses fe80::100:100:99:99/128


ip route add 100.100.99.1/32 via 198.18.112.12
ip route add 100.100.99.2/32 via 198.18.112.13
ip route add 100.100.99.3/32 via 198.18.112.14
#ip route add 100.100.99.99/32 via 198.18.112.1


### Testing connection from one node to another
# ping from m0 to jumphost
ping -I  100.100.99.1 100.100.99.99
# ping from jumphost to m0
ping -I 100.100.99.99 100.100.99.1