Using multiple public facing IPs at random.

federalist

I have OpenVPN running on Ubuntu using FreeRadius Authentication. Currently users connect to the server benefiting from a change in IP address. At the moment, this one server gives one IP address. So I connect at 1.2.3.4 to the server at 9.9.9.0 and websites I visit see the IP 9.9.9.1.

However, I have more IP addresses to use, for the sake of this question, I'd list the IP addresses as:

9.9.9.2
9.9.9.3
9.9.9.4
9.9.6.1
9.9.6.2

Now I have read some other threads in the forum, about using a client-connect and client-disconnect scripts, to use IPTABLES to route depending upon username or port. However, I would like to be able to assign a random public facing IP to each user at every connect. (where it is still possible for multiple users to use the same public IP - eg. 10 users and 6 IPs).

And as a sub-question, I own Beginning OpenVPN (PACKT) and OpenVPN Cookbook, but the aren't as advanced as I require. Where have the super-users of this forum, save just messing around and seeing what works.

federalist

Server.conf

port 1194
proto udp
tmp-dir /tmp
dev tun
ca keys/ca.crt
cert keys/server.crt
key keys/server.key  # This file should be kept secret
dh keys/dh1024.pem
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "redirect-gateway def1"
push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 8.8.4.4"
keepalive 10 120
comp-lzo
persist-key
persist-tun
status openvpn-status.log
log-append  openvpn.log
verb 9
plugin /usr/lib/openvpn/radiusplugin.so /etc/openvpn/radiusplugin.cnf
client-cert-not-required

ifconfig

eth0      Link encap:Ethernet  HWaddr 00:0c:29:cb:bf:29
          inet addr:9.9.9.0  Bcast:9.9.9.255  Mask:255.255.255.0
          inet6 addr: xxxxxxxxxxxxxxxxxxxxxxx/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6288635 errors:0 dropped:10 overruns:0 frame:0
          TX packets:6291301 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:838773319 (838.7 MB)  TX bytes:960291577 (960.2 MB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:14365 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14365 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:714342 (714.3 KB)  TX bytes:714342 (714.3 KB)

tun0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:10.8.0.1  P-t-P:10.8.0.2  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:263244 errors:0 dropped:0 overruns:0 frame:0
          TX packets:326738 errors:0 dropped:3840 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:36670906 (36.6 MB)  TX bytes:373460178 (373.4 MB)