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7.1 Interface configuration

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:

Linuxifconfig interface address netmask netmask
Linux iproute2ip addr add address/prefixlength dev interface
FreeBSDifconfig interface address netmask netmask
OpenBSDifconfig interface address netmask netmask
NetBSDifconfig interface address netmask netmask
Solarisifconfig interface address netmask netmask
Darwin (Mac OS X)ifconfig interface address netmask netmask
Windowsnetsh interface ip set address interface static address netmask

For IPv6 addresses:

Linuxifconfig interface add address/prefixlength
FreeBSDifconfig interface inet6 address prefixlen prefixlength
OpenBSDifconfig interface inet6 address prefixlen prefixlength
NetBSDifconfig interface inet6 address prefixlen prefixlength
Solarisifconfig interface inet6 plumb up
ifconfig interface inet6 addif address address
Darwin (Mac OS X)ifconfig interface inet6 address prefixlen prefixlength
Windowsnetsh interface ipv6 add address interface static address/prefixlength

On some platforms, when running tinc in switch mode, the VPN interface must be set to tap mode with an ifconfig command:

OpenBSDifconfig interface link0

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.

Linuxip tuntap add dev interface mode tun|tap user username

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