Incorrect routing to some public IP addresses due to OpenVPN tunnel.
patok last edited by
Hi folks, I'm facing a pesky problem with pfSenses's OpenVPN service and I'm unfortunately forced to ask wiser and skilled people here. The problem is that some IP addresses do not route to WAN interface (rl0), but they goes to the a virtual one (tap0). For example google's 22.214.171.124 and 126.96.36.199, ubuntuforums.org, or few others. My OpenVPN configuration uses bridging method, client to client communication - the network topology is like: LAN <–> router <--> (INTERNET) <--> clients (they connects from 4 different locations). Clients acquire IP address of LAN (192.168.16.0/24), using 10.0.10.0/24 address pool and are able to comunicate with each other (and PCs in LAN) with no problem. I'm able to connect mentioned IP addresses only when I disable OpenVPN server. When I ssh to pfSense router, I can see few this:
# arp -a ey-in-f104.google.com (188.8.131.52) at (incomplete) on tap0 [ethernet] ? (192.168.16.3) at 00:07:e9:79:xx:xx on rl0 [ethernet] ? (192.168.16.4) at 00:18:f3:ac:xx:xx on rl0 [ethernet] ? (192.168.16.35) at 00:22:15:46:xx:xx on rl0 [ethernet] ? (192.168.16.41) at 00:00:00:00:xx:xx on rl0 [ethernet] ? (192.168.16.47) at 00:1d:60:db:xx:xx on rl0 [ethernet] … # there is more computers in LAN ? (213.194.x.y) at 00:e0:b6:12:d4:ac on xl0 [ethernet] # ISP's router # netstat -rn Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 213.194.x.y UGS 0 77122488 xl0 10.0.10.0&0xa000a02 link#10 UC 0 9080 tap0 184.108.40.206 link#10 UHLW 1 0 tap0 127.0.0.1 127.0.0.1 UH 0 0 lo0 192.168.16.0/24 link#1 UC 0 115823 rl0 192.168.16.3 00:07:e9:79:xx:xx UHLW 1 18 rl0 832 192.168.16.4 00:18:f3:ac:xx:xx UHLW 1 2059216 rl0 1190 192.168.16.35 00:22:15:46:xx:xx UHLW 1 901536 rl0 1166 192.168.16.41 00:00:00:00:xx:xx UHLW 1 22487 rl0 1013 192.168.16.47 00:1d:60:db:xx:xx UHLW 1 30916 rl0 1181 … 213.194.x.z/29 link#2 UC 0 0 xl0 # ISP's network 213.194.x.y 00:e0:b6:12:xx:xx UHLW 2 193535 xl0 1198 # ISP's router 213.194.x.x 213.194.x.x UH 0 0 carp0 # our router (dst+gw addresses are both the same)
There are my configuration files:
writepid /var/run/openvpn_server1.pid #user nobody #group nobody daemon keepalive 10 60 ping-timer-rem persist-tun persist-key dev tun proto tcp-server cipher BF-CBC up /etc/rc.filter_configure down /etc/rc.filter_configure tls-server ifconfig 10.0.10.1 10.0.10.2 push "route 192.168.16.0 255.255.255.0" lport 1194 push "dhcp-option DNS 192.168.16.1" push "dhcp-option WINS 192.168.16.4" push "dhcp-option NBT 4" ca /var/etc/openvpn_server1.ca cert /var/etc/openvpn_server1.cert key /var/etc/openvpn_server1.key dh /var/etc/openvpn_server1.dh comp-lzo persist-remote-ip float dev tap0 float server-bridge 192.168.16.1 255.255.255.0 192.168.16.61 192.168.16.254
port 1194 dev tap dev-node ovpn-tun0 proto tcp-client remote 213.194.x.x 1194 ping 30 persist-tun persist-key tls-client ca C:\\Program\ Files\\OpenVPN\\config\\ca.crt cert C:\\Program\ Files\\OpenVPN\\config\\client1.crt key C:\\Program\ Files\\OpenVPN\\config\\client1.key ns-cert-type server comp-lzo pull
I am also attaching two files from Wireshark scan - first for working google IP address, second for not working (in both cases it's only SYN packet, because nothing more is sent in case of bad routing), but I don't know if there is something helpful in them (I thing not - but maybe I'm wrong). I beleve the problem is not in TCP connection method, coz I tried to switch TCP to UDP (despite of clients configuration stay unchanged) and it not helped at all. If you'll want to know anything else, just say me please. I'll be glad for every suggestion. Thx. ;)