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When configuring an interface, one normally assigns it an address and a netmask. The address uniquely identifies the host on the network attached to the interface. The netmask, combined with the address, forms a subnet. It is used to add a route to the routing table instructing the kernel to send all packets which fall into that subnet to that interface. Because all packets for the entire VPN should go to the virtual network interface used by tinc, the netmask should be such that it encompasses the entire VPN.
For IPv4 addresses:
| Linux | ifconfig interface address ‘netmask’ netmask |
| Linux iproute2 | ip addr add address‘/’prefixlength ‘dev’ interface |
| FreeBSD | ifconfig interface address ‘netmask’ netmask |
| OpenBSD | ifconfig interface address ‘netmask’ netmask |
| NetBSD | ifconfig interface address ‘netmask’ netmask |
| Solaris | ifconfig interface address ‘netmask’ netmask |
| Darwin (MacOS/X) | ifconfig interface address ‘netmask’ netmask |
| Windows | netsh interface ip set address interface ‘static’ address netmask |
For IPv6 addresses:
| Linux | ifconfig interface ‘add’ address‘/’prefixlength |
| FreeBSD | ifconfig interface ‘inet6’ address ‘prefixlen’ prefixlength |
| OpenBSD | ifconfig interface ‘inet6’ address ‘prefixlen’ prefixlength |
| NetBSD | ifconfig interface ‘inet6’ address ‘prefixlen’ prefixlength |
| Solaris | ifconfig interface ‘inet6 plumb up’ |
ifconfig interface ‘inet6 addif’ address address | |
| Darwin (MacOS/X) | ifconfig interface ‘inet6’ address ‘prefixlen’ prefixlength |
| Windows | netsh interface ipv6 add address interface ‘static’ address/prefixlength |
On Linux, it is possible to create a persistent tun/tap interface which will continue to exist even if tinc quit, although this is normally not required. It can be useful to set up a tun/tap interface owned by a non-root user, so tinc can be started without needing any root privileges at all.
| Linux | ip tuntap add dev interface ‘mode’ tun|tap ‘user’ username |