1.) when you have the tunnel up between machine b and machine c they ping their tunnel interfaces because they are in the same network 10.11.0.x, right? ok.
2.) to make allow machine a go through the tunnel to machine c, first all, you must create a route to your dhcp network via the tunnel interface of machine b for example:
ip route add 192.168.2.0/24 via 10.11.0.10
now on machine b you must have to iproute2 to create a table to direct all traffic from origen to go via tunnel to machine c for example:
1.) create a table called "tunnel" for example in rt_table.
2.) you must set the default to route to your table called tunnel
3.) ip route add default via 10.11.0.1 table tunnel
4.) now, you must say the who need to go throught the tunnel via machine c
5.) ip rule add from machine_a_ip_address table tunnel
6.) now, you should be able to ping from machine a to machine c and vice versa.
I hope this help you.
Originally Posted by theVOID
We have a setup of three computers;
Machine A (eth0) -> Machine B (eth0, hso0, tun0) -> Machine C (eth0, tun0)
hso0 is the packet interface of a 3G modem, it behaves like a normal network interface.
Machine B and C are connected in a VPN using openVPN (TCP). Machine A is a client that receives Network-configuration using DHCP from Machine B automatically.
Machine A eth0 : DHCP
Machine B eth0 : 192.168.2.1
Machine B hso0 : Static IP addr, Internet use
Machine B tun0 : 10.11.0.10 (openVPN client)
Machine C eth0 : Static IP addr, Internet use
Machine C tun0 : 10.11.0.1 (openVPN server)
OpenVPN (server) is configured to allow Internet-traffic to its clients. Code in server.conf:
# Make sure clients traverse tun0 when accessing Internet
push "redirect-gateway def1"
# Push a DNS server (handled by openVPN)
push "dhcp-option DNS 10.11.0.1"
We’re having issues to make Machine C release Internet traffic from Machine A. Note that we have setup masquerading on Machine B using iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE.
Currently Iptables on Machine B and Machine C have a policy of ACCEPT.
We have managed to make traffic from Machine A reach Machine C, but only with the internal IP of 192.168.2.48 (DHCP).
OpenVPN drops those packets (as it should!) because they come from 192.* and not 10.*
Is there a way to solve this? Thank you!