What exactly is the meaning of "Subnet" parameter in tinc/$NETNAME/hosts/$SOMEHOSTNAME?

[Mulianto]

Hi,

Subnet there means as , for this subnet you can reach via me (for ip route command).

For the host file there, means i am responsible for this area. Any packet going to this area will pass through me.

Your vpn  can have multiple subnet/area.

You can use hostname as the gateway but must make the dns resolv correct, and it will need more config. 

You need to understand about subnetting to better understand this.

Regards,

Mulianto


Sent from my Mini Ipad 

> On 16 Nov 2017, at 19.56, Philip Blagoveschensky <philip at crabman.me> wrote:
> 
> Hello, I am not very good at linux networking. I have read tinc documentation
> multiple times and I still don't understand what the "Subnet = ..." directive
> does in /etc/tinc/$NET_NAME/hosts/$HOST_NAME
> 
> Right now I have a simple virtual lan organized with tinc, and I use the
> following in every device's config file (replacing the last part of the
> address):
> 
> # This computer will have this ip address in the vpn
> Subnet = 10.20.30.22/32
> 
> This allows me to connect to $HOST_NAME using ip address 10.20.30.22.
> 
> Now what I don't understand is why the guides on how to use one of tinc peer as
> the default gateway tell me to write this too:
> 
> Subnet = 0.0.0.0/0
> 
> I don't understand what this does.
> Why is it not enough to set routes on the client device like this?
> 
> ip route add 0.0.0.0/0 via 10.20.30.22 dev $NET_NAME metric 40
> ip route add $SERVER_IP_ON_INTERNET/32 via 192.168.0.1 dev enp3s0
> 
> Does all this mean, that it's impossible to sometimes use $HOST_NAME_1 as the
> default gateway and sometimes another $HOST_NAME_2, because their
> `Subnet = 0.0.0.0/0` will clash, and something will fuck up?
> 
> -- 
> Philip Blagoveschensky
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