Re: default route problem

[Kuznetsov Vjacheslav <kuznetsovvv gmail com>]

> On Mon, 2008-10-06 at 15:51 +0400, Vitja Makarov wrote:
> > Hi, all!
> > 
> > Home ISP often use the following network configuration scheme:
> > 
> > - Lan IP address is assigned using DHCP
> > - PPTP is used for internet connection
> > 
> > If pptp server is in your network, that should be ok to replace
> > default route with ppp one,
> > but when pptp server is routed via DHCP provided default route, you
> > can't simply do it,
> > you have first provide manually route for pptp server, then remove
> default.
> 
> NM should be adding a specific route to the PPTP server via the
> underlying device so that you can always get to the PPTP server while
> connected. Then, it should be changing the default route to route
> everything through the VPN _unless_ you've added your own specific
> routes via the connection editor or the server has sent you specific
> routes.
> 
> It seems it's not doing that here, correct?

I have a similar issue trying to use PPTP for internet connection. I
have wrong default gateway device after the pptp connection established.
Here is the routing table before pptp:

---
$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
10.73.197.0     0.0.0.0         255.255.255.0   U     0      0        0
eth0
0.0.0.0         10.73.197.1     0.0.0.0         UG    0      0        0
eth0

$ ip route show
10.73.197.0/24 dev eth0  proto kernel  scope link  src 10.73.197.6
default via 10.73.197.1 dev eth0  proto static
---

and following I get after connection is done:

---
$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
0.0.0.0         10.73.197.1     255.255.255.255 UGH   0      0        0
eth0
10.73.100.1     10.73.197.1     255.255.255.255 UGH   0      0        0
eth0
10.73.197.0     0.0.0.0         255.255.255.0   U     0      0        0
eth0
10.73.0.0       0.0.0.0         255.255.0.0     U     0      0        0
eth0
0.0.0.0         10.73.100.1     0.0.0.0         UG    0      0        0
eth0

$ ip route show
0.0.0.0 via 10.73.197.1 dev eth0  proto static
10.73.100.1 via 10.73.197.1 dev eth0  src 10.73.197.6
10.73.197.0/24 dev eth0  proto kernel  scope link  src 10.73.197.6
10.73.0.0/16 dev eth0  scope link
default via 10.73.100.1 dev eth0
---

As you can see it does not use the ppp0 device. And I have to correct
the default route to have the internet:

---
# ip route change dev ppp0 default

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
0.0.0.0         10.73.197.1     255.255.255.255 UGH   0      0        0
eth0
10.73.100.1     10.73.197.1     255.255.255.255 UGH   0      0        0
eth0
10.73.197.0     0.0.0.0         255.255.255.0   U     0      0        0
eth0
10.73.0.0       0.0.0.0         255.255.0.0     U     0      0        0
eth0
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0
ppp0

$ ip route show
0.0.0.0 via 10.73.197.1 dev eth0  proto static
10.73.100.1 via 10.73.197.1 dev eth0  src 10.73.197.6
10.73.197.0/24 dev eth0  proto kernel  scope link  src 10.73.197.6
10.73.0.0/16 dev eth0  scope link
default dev ppp0  scope link
---

After that it works fine.

Please let me know how can I repair it. I'm using the Automatic (VPN)
method and I do not modify the routes using the NM capabilities.

It is a home workstation.
NetworkManager 0.7.0
Fedora 9
Linux sshome 2.6.27.5-37.fc9.i686 #1 SMP Wed Nov 12 18:56:28 EST 2008
i686 i686 i386 GNU/Linux

---
Thanks,
Kuznetsov Vyacheslav.