Re: [nm-libreswan] set static routes without knowing the assign ip address



On Fri, 2016-05-27 at 00:02 +0200, Antonio Silva wrote:
Hi,
is it possible to add static routes when you don't know the ip that
will gonna be assign by vpn server?
The idea is to use  connection only to connect to the remote
networks, all the default traffic should not be sent to the vpn.

In configuration IPV4, I set routes:
Routes Automatic: Off
address: 192.168.8.0
netmask: 255.255.255.0
gateway: 0.0.0.0
x - Use this connection only for resources on its network.

When connecting, the route is added but no traffic! This
configuration works with nm-vpnc
ip r shows:
192.168.8.0/24 dev wlp3s0f0  proto static  scope link  metric 50 

Since i know the ip address of the vpn, i know set the routes:
Routes Automatic: Off
address: 192.168.8.0
netmask: 255.255.255.0
gateway: 192.168.20.3
x - Use this connection only for resources on its network.

This works, i see the route and the traffic to remote network is ok. 
ip r shows:
192.168.8.0/24 via 192.168.20.3 dev wlp3s0f0  proto static  metric
50 

Could be a nice feature to detect the assign ip address to the vpn
and replace the 0.0.0.0 when configuring the route. 

BTW, tested with git version, last commit
b2a4514a78d39e2f4c9760d655e9a762be2c5f96.

Thanks.
António

Hi António,


what you suggest here is currently not possible. It would certainly be
a useful feature to support wildcard gateways.

Similar to openvpn, where you can specify the gateway of routes
as vpn_gateway, net_gateway, remote_host.



Note that in your example you did static addressing of the VPN. As you
do that, it seems you already know the details about the network behind
the VPN and you should equally know the precise gateway to use.
OTOH, if you use dynamic addressing, it will also work, because you
also receive the correct gateway from the VPN connection.
Why do you want to configure the gateway manually instead of letting it
be configured automatically?
So, it seems in your example you don't need that, do you?

Of course, you can think of examples where a wildcard gateway is indeed
useful. Possibly your situation is more complex so that you could use
it...


Also, NetworkManager treats the default route somehow special from
regular static routes. For what is worth, I think that is a mistake,
but anyway.
When adding a static non-default route, a wildcard gateway becomes much
more useful then for the default-route. For the default-route it seems
less needed. Can you not just accept whatever you get dynamically,
instead of configuring the gateway manually?


Thomas

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