Server Fault Asked by DAKSH on January 1, 2022
I have configured openvpn server and able to login as well. However after the connection is eastablished I’m not able to access intranet websites.
Server ifconfig looks like bewlow
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:03:90:0b brd ff:ff:ff:ff:ff:ff
inet 192.168.0.253/24 brd 192.168.0.255 scope global noprefixroute enp1s0
valid_lft forever preferred_lft forever
inet6 fd01::5054:ff:fe03:900b/64 scope global dynamic noprefixroute
valid_lft 259sec preferred_lft 259sec
inet6 fe80::5054:ff:fe03:900b/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100
link/none
inet 10.8.0.1 peer 10.8.0.2/32 scope global tun0
valid_lft forever preferred_lft forever
inet6 fe80::aa36:56c8:3a99:2a98/64 scope link stable-privacy
valid_lft forever preferred_lft forever
And iptables output
Chain INPUT (policy ACCEPT 149 packets, 9788 bytes)
pkts bytes target prot opt in out source destination
322 37460 ACCEPT udp -- enp1s0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:1194
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 346 packets, 28928 bytes)
pkts bytes target prot opt in out source destination
The server is hosted on a vitual machine installed on KVM and connected to the local network through bridge connection. I think that there is some issue with iptables forwarding and accepting traffic from tunnel to ethernet. I really have no knowledge about iptables. Little help will be appreciated.
Inside Office network
traceroute officework.net
traceroute to officework.net (192.168.0.2), 30 hops max, 60 byte packets
1 192.168.0.2 (192.168.0.2) 2.994 ms !X 2.885 ms !X 2.841 ms !X
Outside office network outside office network
traceroute officework.net
officework.net: Name or service not known
Cannot handle "host" cmdline arg `officework.net' on position 1 (argc 1)
Trceroute with IP
traceroute 192.168.0.2
traceroute to 192.168.0.2 (192.168.0.2), 30 hops max, 60 byte packets
1 _gateway (192.168.43.1) 1.549 ms 1.416 ms 43.679 ms
2 * * *
3 10.71.135.19 (10.71.135.19) 31.621 ms 40.307 ms 31.470 ms
4 192.168.31.239 (192.168.31.239) 31.274 ms 192.168.31.243 (192.168.31.243) 36.119 ms 40.036 ms
5 192.168.37.9 (192.168.37.9) 39.465 ms 39.675 ms 39.683 ms
6 172.25.11.164 (172.25.11.164) 35.374 ms 24.760 ms 35.150 ms
7 * * *
8 * * *
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
ifconfig outside office network
ifconfig
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 96 bytes 7644 (7.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 96 bytes 7644 (7.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 10.8.0.6 netmask 255.255.255.255 destination 10.8.0.5
inet6 fe80::3374:cf7a:d81:cc05 prefixlen 64 scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 100 (UNSPEC)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 39 bytes 3394 (3.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:87:ae:c6 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
wlp1s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.43.187 netmask 255.255.255.0 broadcast 192.168.43.255
inet6 2409:4060:9f:2013:387c:6e1c:5399:a2c7 prefixlen 64 scopeid 0x0<global>
inet6 fe80::31a:f142:92dd:f67a prefixlen 64 scopeid 0x20<link>
ether a8:a7:95:67:0f:23 txqueuelen 1000 (Ethernet)
RX packets 6976 bytes 5783306 (5.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7029 bytes 1291358 (1.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Finally google did help with the problem. As explained in https://openvpn.net/community-resources/how-to/#scope I added
push "route 192.168.0.0 255.255.255.0"
In server configuration file And added iptables
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o enp1s0 -j MASQUERADE
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to-source 192.168.0.253
Now everything works like a charm. If you want DNS to be working just add DNS server entry in Wifi or Lan connection and you are in the office.
Answered by DAKSH on January 1, 2022
You need to use your DNS servers that host the records for the intranet site, not public DNS servers. Likely your internal servers. Try entering the IP address of the intranet site in your browser and see if that connects.
Answered by Bert on January 1, 2022
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