Re: Trouble setting VPN for specific IP via NetworkManager

[Michael Butash <michael butash net>]

I've noticed similar behavior using vpnc-based vpn's that doesn't setup 
routes quite right.  It adds the prefixes negotiated for routes by the 
server, but it still insists on repointing a default route at the tun 
interface as well, breaking split-tunneling.  I keep forgetting to spam 
the list asking about this, thanks for the reminder.  :)

Can NM not explicitly repoint the default route to a tunnel please?  You 
only want this when the vpn server sends an explicit default, but for 
split tunneling, it needs to be versatile and only add the prefixes 
wanted, leaving the default at the original gateway.

You can remove and add routes manually every time, it's more or less 
what I do to override nm's bad behavior, but vpnc doesn't use ppp 
interfaces.  Not sure why that is complicating for you other than the 
fact the ppp interface

Try "route add default dev ppp0" without a gw addy?  PPP doesn't use 
gateways per se.

-mb


On 10/23/2011 02:33 PM, Mohan Sfo wrote:
> Hello all,
>
> I apologize for asking such an elementary question on this list. Thanks
> for your help. Two question below:
>
> 1) I am playing with setting up VPN via NetworkManager. I am able to
> successfully setup VPN. Unfortunately, it is setting up *all* the routes
> to go via the VPN. I want traffic for only a few address to go via VPN
> and everything else to use the existing routes on wlan0. How do I do it?
>
> 2) Where are the log files for VPN or pppd stuff in NetworkManager? How
> do I setup so that there is logging so that I can debug why I am having
> connectivity problems.
>
> After setting up VPN connection:
> #route -n
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use Iface
> 10.116.78.13 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
> 226.22.44.56 192.168.2.1 255.255.255.255 UGH 0 0 0 wlan0
> 226.22.44.56 192.168.2.1 255.255.255.255 UGH 0 0 0 wlan0
> 192.168.2.0 0.0.0.0 255.255.255.0 U 2 0 0 wlan0
> 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 wlan0
> 0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 ppp0
> #
>
>
> I deleted the default route below, and then added wlan0 as the new
> default route. Regular stuff like google.com <http://google.com> are
> working fine over wlan0. However, I run into trouble when I tell that
> specific IP lists should go over ppp0.
>
> #route del default
> #route add default gw 192.168.2.1 dev wlan0
>
>
> Now, I run into trouble when I tell that specific IP 10.10.115.123
> should go over ppp0.
>
>
> #route add host 10.10.115.123 gw 0.0.0.0 dev ppp0
> SIOCADDRT: Invalid argument
>
>
> Please suggest me how I can do it over command line via route or via
> NetworkManager.
>
>
>
> Thanks,
> Mohan
>
>
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