For our customers I have to set up an openvpn server and client.
Our cell software creates Linux tunnels (e.g. tun0, tun1) when a cell
phone wants to do a data session. Subsequently on startup our software
kills all the tunnels. Unfortunately, it then kills the VPN client (this
on the client side).
So to get around this, a person at work changed in the ovpn file
dev tun0 to dev ppp0 so it would not get killed. As far as I understand
though, openvpn is not ppp. I am wondering whether this will cause any
problems in CentOS, calling a tunnel ppp?
On a related note they want me to write something called "reroute" which
has a parameter (-V or -E) which will reroute all traffic, except
192.168.5.10, either via VPN or via ETHERNET. 192.168.5.10 will always
go through VPN so I gave it its own route. Basically what it does:
Through VPN:
0.0.0.0 0.0.0.0 128.0.0.0 U 0 0 0 ppp0
128.0.0.0 0.0.0.0 128.0.0.0 U 0 0 0 ppp0
0.0.0.0 192.168.5.1 0.0.0.0 UG 0 0 0 eth0
Through eth0 just
0.0.0.0 192.168.5.1 0.0.0.0 UG 0 0 0 eth0
I could remove the 0.0.0.0 with netmask 0.0.0.0 when routing through the
VPN but I don't want to forget what the original router (192.168.5.1) is.
So a question is, what has precedence, 0.0.0.0 with netmask 0.0.0.0 or
0.0.0.0 and 128.0.0.0 with a netmask of 128.0.0.0? They bothe appear to
cover every address (not specifically specified in a previous route which I did not show).
For completion, here is the full set of routes:
10.6.1.50 192.168.5.15 255.255.255.255 UGH 0 0 0 eth0
192.168.5.10 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
192.168.5.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
10.4.55.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
10.0.0.0 192.168.5.15 255.0.0.0 UG 0 0 0 eth0
0.0.0.0 0.0.0.0 128.0.0.0 U 0 0 0 ppp0
128.0.0.0 0.0.0.0 128.0.0.0 U 0 0 0 ppp0
0.0.0.0 192.168.5.1 0.0.0.0 UG 0 0 0 eth0
ppp0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:10.1.0.6 P-t-P:10.1.0.6 Mask:255.0.0.0
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
we need the ip address 10.0.1.6
10.4.55.X should definitely be eth0
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