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+--- Thread: Route traffic from vpn clients of one server to second server (/Thread-Route-traffic-from-vpn-clients-of-one-server-to-second-server)
Route traffic from vpn clients of one server to second server - gamblad42 - 07-29-2018
Hello. I have one vpn server(server A). Server A is connected to other vpn server(server B). Server A has some clients.
Is it possible to route only traffic from vpn clients of server A to the connection of server B, so the machine A will use default internet connection?
Each of clients is connected to some ppp+ interface(ppp1-10) and has the ip address 11.0.0.1-10. 11.0.1.1 - ip of pptpd server. Ppp0 is the interface of connection to server B.
ifconfig output:
eth0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether e8:03:9a:93:07:53 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 13486316 bytes 3242965197 (3.0 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 13486316 bytes 3242965197 (3.0 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ppp0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1400
inet 192.168.1.50 netmask 255.255.255.255 destination 192.168.1.1
ppp txqueuelen 3 (Point-to-Point Protocol)
RX packets 12 bytes 949 (949.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 12 bytes 1411 (1.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ppp1: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1396
inet 11.0.1.1 netmask 255.255.255.255 destination 11.0.0.1
ppp txqueuelen 3 (Point-to-Point Protocol)
RX packets 7 bytes 88 (88.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7 bytes 82 (82.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.4 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::9244:b58:9664:49b3 prefixlen 64 scopeid 0x20<link>
ether b8:03:05:4f:8a:44 txqueuelen 1000 (Ethernet)
RX packets 3950317 bytes 2674081227 (2.4 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 9771716 bytes 2046374004 (1.9 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
route -n output:
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 0.0.0.0 0.0.0.0 U 50 0 0 ppp0
0.0.0.0 192.168.1.1 0.0.0.0 UG 600 0 0 wlan0
11.0.0.1 0.0.0.0 255.255.255.255 UH 0 0 0 ppp1
"ip of server B" 192.168.1.1 255.255.255.255 UGH 0 0 0 wlan0
"ip of server B" 192.168.1.1 255.255.255.255 UGH 600 0 0 wlan0
192.168.1.0 0.0.0.0 255.255.255.0 U 600 0 0 wlan0
192.168.1.1 0.0.0.0 255.255.255.255 UH 50 0 0 ppp0
192.168.1.1 0.0.0.0 255.255.255.255 UH 600 0 0 wlan0
I can only disable default routing to ppp0 by deleting first line of routing table. But i don't know how to route traffic from vpn clients to it.
RE: Route traffic from vpn clients of one server to second server - Cryogenica - 08-05-2018
You can configure iptables to redirect from one network interface to another. This process is pretty simple, and with a bit of googling you should be able to configure IP forwarding. Maybe you gould look up how to set up a NAT with iptables and configure IP forwarding.