Question

what is the purpose of network 10.17.0.0/16 on eth0?

while configuring firewall rules for a new (ubuntu 18.04 in nyc3) droplet today, i noticed that the output of route (below) shows three networks instead of the normal two (public, private).

can anyone tell me why the network 10.17.0.0 exists in our droplets?

104.131.0.0 - public 10.132.0.0 - private 10.17.0.0 - ???

root@104:~# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         _gateway        0.0.0.0         UG    0      0        0 eth0
10.17.0.0       0.0.0.0         255.255.0.0     U     0      0        0 eth0
10.132.0.0      0.0.0.0         255.255.0.0     U     0      0        0 eth1
104.131.0.0     0.0.0.0         255.255.192.0   U     0      0        0 eth0

thanks! -lee


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ok. got it. thanks!

so apparently, even when a droplet has no floating ip enabled at the time of it’s creation, the anchor ip will be configured for the droplet regardless, to ease the process of enabling floating ip at a later time.

Your public network interface has an “Anchor IP” associated with it for the use of a floating IP:

https://www.digitalocean.com/community/tutorials/how-to-use-floating-ips-on-digitalocean#getting-anchor-and-floating-ip-information

Thanks for the speedy reply ryanpq!

Nope, it’s just a basic droplet with private networking, so no floating IPs or load balancing. Also no backup plan, monitoring, cloud-firewall or IPv6.