openvpn server [ SOLVED]

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openvpn server [ SOLVED]

Unread postby richard-g8jvm » Fri Sep 14, 2018 2:12 am

Has anyone successfully got a openvpn server running on a C1
I'm trying , but getting authentication errors pointing at TLS
but when trying to run
build-key-server
Code: Select all
root@odroid:/etc/openvpn/easy-rsa# ./build-key-server
/etc/openvpn/easy-rsa/pkitool: 293: shift: can't shift that many

I found a couple of tutorials , but they are written for those who understand openvpn in the first place.

Has anyone written a simple easy to understand howto for any of the odroids ??
There are stacks of howtos on setting up clients for commercial VPNs , and in most cases there is only one key file, ca.crt, used by the client.
plus a TLS cipher
I've done a clean-all to start again with the certs and keys
Last edited by richard-g8jvm on Sat Sep 15, 2018 7:30 pm, edited 1 time in total.
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Re: openvpn server

Unread postby mad_ady » Fri Sep 14, 2018 3:15 am

I haven't tried it on an odroid, but you can try to set it up without key authentication - only user-password.
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Re: openvpn server

Unread postby richard-g8jvm » Fri Sep 14, 2018 4:01 am

Hiya

I've found
https://openvpn.net/index.php/open-sour ... l#examples
At least its says which files go where
My server config file :-
Code: Select all
root@odroid:/etc/openvpn# cat server.conf
#################################################
# Sample OpenVPN 2.0 config file for            #
# multi-client server.                          #
#                                               #
# This file is for the server side              #
# of a many-clients <-> one-server              #
# OpenVPN configuration.                        #
#                                               #
# OpenVPN also supports                         #
# single-machine <-> single-machine             #
# configurations (See the Examples page         #
# on the web site for more info).               #
#                                               #
# This config should work on Windows            #
# or Linux/BSD systems.  Remember on            #
# Windows to quote pathnames and use            #
# double backslashes, e.g.:                     #
# "C:\\Program Files\\OpenVPN\\config\\foo.key" #
#                                               #
# Comments are preceded with '#' or ';'         #
#################################################

# Which local IP address should OpenVPN
# listen on? (optional)
;local a.b.c.d

# Which TCP/UDP port should OpenVPN listen on?
# If you want to run multiple OpenVPN instances
# on the same machine, use a different port
# number for each one.  You will need to
# open up this port on your firewall.
port 443

# TCP or UDP server?
;proto tcp
proto udp

# "dev tun" will create a routed IP tunnel,
# "dev tap" will create an ethernet tunnel.
# Use "dev tap0" if you are ethernet bridging
# and have precreated a tap0 virtual interface
# and bridged it with your ethernet interface.
# If you want to control access policies
# over the VPN, you must create firewall
# rules for the the TUN/TAP interface.
# On non-Windows systems, you can give
# an explicit unit number, such as tun0.
# On Windows, use "dev-node" for this.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
;dev tap
dev tun

# Windows needs the TAP-Win32 adapter name
# from the Network Connections panel if you
# have more than one.  On XP SP2 or higher,
# you may need to selectively disable the
# Windows firewall for the TAP adapter.
# Non-Windows systems usually don't need this.
;dev-node MyTap

# SSL/TLS root certificate (ca), certificate
# (cert), and private key (key).  Each client
# and the server must have their own cert and
# key file.  The server and all clients will
# use the same ca file.
#
# See the "easy-rsa" directory for a series
# of scripts for generating RSA certificates
# and private keys.  Remember to use
# a unique Common Name for the server
# and each of the client certificates.
#
# Any X509 key management system can be used.
# OpenVPN can also use a PKCS #12 formatted key file
# (see "pkcs12" directive in man page).
ca /etc/openvpn/easy-rsa/keys/ca.crt
cert /etc/openvpn/easy-rsa/keys/server.crt
#key server.key  # This file should be kept secret
key /etc/openvpn/easy-rsa/keys/server.key
;remote-cert-tls server

# Diffie hellman parameters.
# Generate your own with:
#   openssl dhparam -out dh2048.pem 2048
dh /etc/openvpn/easy-rsa/keys/dh1024.pem

# Network topology
# Should be subnet (addressing via IP)
# unless Windows clients v2.0.9 and lower have to
# be supported (then net30, i.e. a /30 per client)
# Defaults to net30 (not recommended)
;topology subnet

# Configure server mode and supply a VPN subnet
# for OpenVPN to draw client addresses from.
# The server will take 10.8.0.1 for itself,
# the rest will be made available to clients.
# Each client will be able to reach the server
# on 10.8.0.1. Comment this line out if you are
# ethernet bridging. See the man page for more info.
server 10.8.0.0 255.255.255.0

# Maintain a record of client <-> virtual IP address
# associations in this file.  If OpenVPN goes down or
# is restarted, reconnecting clients can be assigned
# the same virtual IP address from the pool that was
# previously assigned.
ifconfig-pool-persist /var/log/openvpn/ipp.txt

# Configure server mode for ethernet bridging.
# You must first use your OS's bridging capability
# to bridge the TAP interface with the ethernet
# NIC interface.  Then you must manually set the
# IP/netmask on the bridge interface, here we
# assume 10.8.0.4/255.255.255.0.  Finally we
# must set aside an IP range in this subnet
# (start=10.8.0.50 end=10.8.0.100) to allocate
# to connecting clients.  Leave this line commented
# out unless you are ethernet bridging.
;server-bridge 10.8.0.4 255.255.255.0 10.8.0.50 10.8.0.100

# Configure server mode for ethernet bridging
# using a DHCP-proxy, where clients talk
# to the OpenVPN server-side DHCP server
# to receive their IP address allocation
# and DNS server addresses.  You must first use
# your OS's bridging capability to bridge the TAP
# interface with the ethernet NIC interface.
# Note: this mode only works on clients (such as
# Windows), where the client-side TAP adapter is
# bound to a DHCP client.
;server-bridge

# Push routes to the client to allow it
# to reach other private subnets behind
# the server.  Remember that these
# private subnets will also need
# to know to route the OpenVPN client
# address pool (10.8.0.0/255.255.255.0)
# back to the OpenVPN server.
;push "route 192.168.10.0 255.255.255.0"
;push "route 192.168.20.0 255.255.255.0"

# To assign specific IP addresses to specific
# clients or if a connecting client has a private
# subnet behind it that should also have VPN access,
# use the subdirectory "ccd" for client-specific
# configuration files (see man page for more info).

# EXAMPLE: Suppose the client
# having the certificate common name "Thelonious"
# also has a small subnet behind his connecting
# machine, such as 192.168.40.128/255.255.255.248.
# First, uncomment out these lines:
;client-config-dir ccd
;route 192.168.40.128 255.255.255.248
# Then create a file ccd/Thelonious with this line:
#   iroute 192.168.40.128 255.255.255.248
# This will allow Thelonious' private subnet to
# access the VPN.  This example will only work
# if you are routing, not bridging, i.e. you are
# using "dev tun" and "server" directives.

# EXAMPLE: Suppose you want to give
# Thelonious a fixed VPN IP address of 10.9.0.1.
# First uncomment out these lines:
;client-config-dir ccd
;route 10.9.0.0 255.255.255.252
# Then add this line to ccd/Thelonious:
#   ifconfig-push 10.9.0.1 10.9.0.2

# Suppose that you want to enable different
# firewall access policies for different groups
# of clients.  There are two methods:
# (1) Run multiple OpenVPN daemons, one for each
#     group, and firewall the TUN/TAP interface
#     for each group/daemon appropriately.
# (2) (Advanced) Create a script to dynamically
#     modify the firewall in response to access
#     from different clients.  See man
#     page for more info on learn-address script.
;learn-address ./script

# If enabled, this directive will configure
# all clients to redirect their default
# network gateway through the VPN, causing
# all IP traffic such as web browsing and
# and DNS lookups to go through the VPN
# (The OpenVPN server machine may need to NAT
# or bridge the TUN/TAP interface to the internet
# in order for this to work properly).
push "redirect-gateway def1 bypass-dhcp"

# Certain Windows-specific network settings
# can be pushed to clients, such as DNS
# or WINS server addresses.  CAVEAT:
# http://openvpn.net/faq.html#dhcpcaveats
# The addresses below refer to the public
# DNS servers provided by opendns.com.
push "dhcp-option DNS 208.67.222.222"
push "dhcp-option DNS 208.67.220.220"

# Uncomment this directive to allow different
# clients to be able to "see" each other.
# By default, clients will only see the server.
# To force clients to only see the server, you
# will also need to appropriately firewall the
# server's TUN/TAP interface.
;client-to-client

# Uncomment this directive if multiple clients
# might connect with the same certificate/key
# files or common names.  This is recommended
# only for testing purposes.  For production use,
# each client should have its own certificate/key
# pair.
#
# IF YOU HAVE NOT GENERATED INDIVIDUAL
# CERTIFICATE/KEY PAIRS FOR EACH CLIENT,
# EACH HAVING ITS OWN UNIQUE "COMMON NAME",
# UNCOMMENT THIS LINE OUT.
;duplicate-cn

# The keepalive directive causes ping-like
# messages to be sent back and forth over
# the link so that each side knows when
# the other side has gone down.
# Ping every 10 seconds, assume that remote
# peer is down if no ping received during
# a 120 second time period.
keepalive 10 120

# For extra security beyond that provided
# by SSL/TLS, create an "HMAC firewall"
# to help block DoS attacks and UDP port flooding.
#
# Generate with:
#   openvpn --genkey --secret ta.key
#
# The server and each client must have
# a copy of this key.
# The second parameter should be '0'
# on the server and '1' on the clients.
;tls-auth ta.key 0 # This file is secret

# Select a cryptographic cipher.
# This config item must be copied to
# the client config file as well.
# Note that v2.4 client/server will automatically
# negotiate AES-256-GCM in TLS mode.
# See also the ncp-cipher option in the manpage
cipher AES-256-CBC

# Enable compression on the VPN link and push the
# option to the client (v2.4+ only, for earlier
# versions see below)
;compress lz4-v2
;push "compress lz4-v2"

# For compression compatible with older clients use comp-lzo
# If you enable it here, you must also
# enable it in the client config file.
comp-lzo

# The maximum number of concurrently connected
# clients we want to allow.
;max-clients 100

# It's a good idea to reduce the OpenVPN
# daemon's privileges after initialization.
#
# You can uncomment this out on
# non-Windows systems.
user nobody
group nogroup

# The persist options will try to avoid
# accessing certain resources on restart
# that may no longer be accessible because
# of the privilege downgrade.
persist-key
persist-tun

# Output a short status file showing
# current connections, truncated
# and rewritten every minute.
status /var/log/openvpn/openvpn-status.log

# By default, log messages will go to the syslog (or
# on Windows, if running as a service, they will go to
# the "\Program Files\OpenVPN\log" directory).
# Use log or log-append to override this default.
# "log" will truncate the log file on OpenVPN startup,
# while "log-append" will append to it.  Use one
# or the other (but not both).
log         /var/log/openvpn/openvpn.log
;log-append  /var/log/openvpn/openvpn.log

# Set the appropriate level of log
# file verbosity.
#
# 0 is silent, except for fatal errors
# 4 is reasonable for general usage
# 5 and 6 can help to debug connection problems
# 9 is extremely verbose
verb 3

# Silence repeating messages.  At most 20
# sequential messages of the same message
# category will be output to the log.
;mute 20

# Notify the client that when the server restarts so it
# can automatically reconnect.


I've run systemctl start openvpn
systemctl status openvpn shows
Code: Select all
‚óŹ openvpn.service - OpenVPN service
   Loaded: loaded (/lib/systemd/system/openvpn.service; enabled; vendor preset: enabled)
   Active: active (exited) since Thu 2018-09-13 18:23:22 UTC; 32min ago
  Process: 421 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
 Main PID: 421 (code=exited, status=0/SUCCESS)

Sep 13 18:23:22 odroid systemd[1]: Starting OpenVPN service...
Sep 13 18:23:22 odroid systemd[1]: Started OpenVPN service.


and a tunnel is up
Code: Select all
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
        inet 10.8.0.1  netmask 255.255.255.255  destination 10.8.0.2
        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 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



now the fun bit setting the laptop up as a client and trying to connect

this could need much bere, you may need a few by the time I get this working :)

Nearly there
I can tunnel from the laptop to the WAN ipaddress to the C1
I can ping from the laptop 10.8.0.5
But its not routing packets from the C1 to the router and internet.
If I stop the VPN I can access the inet from the laptop

you may need some Timisoareana
client.conf
Code: Select all
client

;dev tap
dev tun
;proto tcp
proto udp

remote 80.xx.xx.243 443
;remote my-server-2 1194
;remote 192.168.1.80 443


# Keep trying indefinitely to resolve the
# host name of the OpenVPN server.  Very useful
# on machines which are not permanently connected
# to the internet such as laptops.
resolv-retry infinite

# Most clients don't need to bind to
# a specific local port number.
nobind

# Downgrade privileges after initialization (non-Windows only)
user nobody
group nogroup

# Try to preserve some state across restarts.
persist-key
persist-tun

# If you are connecting through an
# HTTP proxy to reach the actual OpenVPN
# server, put the proxy server/IP and
# port number here.  See the man page
# if your proxy server requires
# authentication.
;http-proxy-retry # retry on connection failures
;http-proxy [proxy server] [proxy port #]

# Wireless networks often produce a lot
# of duplicate packets.  Set this flag
# to silence duplicate packet warnings.
;mute-replay-warnings

# SSL/TLS parms.
# See the server config file for more
# description.  It's best to use
# a separate .crt/.key file pair
# for each client.  A single ca
# file can be used for all clients.
ca /etc/openvpn/ca.crt
cert /etc/openvpn/client1.crt
key /etc/openvpn/client1.key

# Verify server certificate by checking that the
# certicate has the correct key usage set.
# This is an important precaution to protect against
# a potential attack discussed here:
#  http://openvpn.net/howto.html#mitm
#
# To use this feature, you will need to generate
# your server certificates with the keyUsage set to
#   digitalSignature, keyEncipherment
# and the extendedKeyUsage to
#   serverAuth
# EasyRSA can do this for you.
;remote-cert-tls server

# If a tls-auth key is used on the server
# then every client must also have the key.
;tls-auth ta.key 1

# Select a cryptographic cipher.
# If the cipher option is used on the server
# then you must also specify it here.
# Note that v2.4 client/server will automatically
# negotiate AES-256-GCM in TLS mode.
# See also the ncp-cipher option in the manpage
cipher AES-256-CBC

# Enable compression on the VPN link.
# Don't enable this unless it is also
# enabled in the server config file.
comp-lzo

# Set log file verbosity.
verb 3

# Silence repeating messages
;mute 20

BR
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Re: openvpn server

Unread postby richard-g8jvm » Fri Sep 14, 2018 6:33 am

Umm I dont think Ubuntu 18.04 is a good idea at the moment :(
Something very screwy happening
iptables is not happy with openvpn and me
cant stop or start it, and its corrupting a iptables-restore

Code: Select all
root@odroid:~# iptables -t nat -L
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
DNAT       tcp  --  anywhere             anywhere             tcp dpt:8083 to:192.168.1.70:8083
DNAT       tcp  --  anywhere             anywhere             tcp dpt:tproxy to:192.168.1.71:7776
DNAT       tcp  --  anywhere             anywhere             tcp dpt:8085 to:192.168.1.72:7777

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
MASQUERADE  tcp  --  anywhere             odroid.lan           tcp dpt:8083
MASQUERADE  all  --  10.8.0.0/24          anywhere           
root@odroid:~# man iptables
root@odroid:~# systemctl disable iptables
Failed to disable unit: Unit file iptables.service does not exist.
root@odroid:~# service iptables stop
Failed to stop iptables.service: Unit iptables.service not loaded.


none of the systemctl or service options do anything, even after a reboot.
dont know where its got tproxy from on second DNAT line it should be 8081
I have tried a apt reinstall of iptables, but still the same :(
unbutu 16.04 being loaded in the morning and start again.
BR
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Re: openvpn server

Unread postby odroid » Fri Sep 14, 2018 8:05 am

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Re: openvpn server

Unread postby mad_ady » Fri Sep 14, 2018 2:25 pm

Oh, that's nice - I didn't know there was an openvpn guide...
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Re: openvpn server

Unread postby richard-g8jvm » Fri Sep 14, 2018 6:02 pm

thats a very useful guide :)

All the forwarding on the C1 has stopped since trying to get openvpn up and running
Code: Select all
root@odroid:/etc# iptables -t nat -vL
Chain PREROUTING (policy ACCEPT 1 packets, 256 bytes)
 pkts bytes target     prot opt in     out     source               destination         
   42  2520 DNAT       tcp  --  any    any     anywhere             anywhere             tcp dpt:8083 to:192.168.1.70:8083
   14   840 DNAT       tcp  --  any    any     anywhere             anywhere             tcp dpt:tproxy to:192.168.1.71:7776
    0     0 DNAT       tcp  --  any    any     anywhere             anywhere             tcp dpt:8085 to:192.168.1.72:7777

Chain INPUT (policy ACCEPT 1 packets, 256 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 MASQUERADE  tcp  --  any    any     anywhere             odroid.lan           tcp dpt:8083


I dont understand why the tproxy comes from ???
the rules were restored from what was working
Code: Select all
# Generated by iptables-save v1.6.1 on Wed Sep 12 18:42:10 2018
*nat
:PREROUTING ACCEPT [18:4517]
:INPUT ACCEPT [18:4517]
:OUTPUT ACCEPT [52:3494]
-A PREROUTING -p tcp -m tcp --dport 8083 -j DNAT --to-destination 192.168.1.70:8083
-A PREROUTING -p tcp -m tcp --dport 8081 -j DNAT --to-destination 192.168.1.71:7776
-A PREROUTING -p tcp -m tcp --dport 8085 -j DNAT --to-destination 192.168.1.72:7777
#-A POSTROUTING -p tcp --sport 8083 -j MASQUERADE
-A POSTROUTING -d 192.168.1.70 -p tcp --dport 8083 -j MASQUERADE
#-A POSTROUTING -d 192.168.1.71 -p tcp --dport 7776 -j MASQUERADE
#-A POSTROUTING -d 192.168.1.72 -p tcp --dport 7777 -j MASQUERADE
:POSTROUTING ACCEPT [0:0]
COMMIT


yet from a browser http://192.168.1.80:8081 or 8083 or 8085 all fail with connection refused.
Using the destination address works OK
I thought was file corruption , thats why I loaded ubuntu16.04.5
I can ssh in to 192.168.1.80 so the network is OK.
I cant see why something that worked has stopped , can anyone ?????
I need to get this fixed before installing a vpn again
Thanks

A bit more

ps ax | grep iptables shows no process running
and neither systemctl start iptables or service start iptables work
just get unknown service :(
BR
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Re: openvpn server

Unread postby richard-g8jvm » Sat Sep 15, 2018 12:34 am

Hi
I've got to the bottom of whats happening
I've gone back to ubuntu18.04 and replaced the SD card as the one I was using was slow, but that wasn't the problem

the problem is ip-forwarding is needed to be turned on everytime its booted
its not made clear in a lot of tutorials that the setting is volatile, so when I found it was volatile
I componded the mistake by editing /etc.sysctl.conf and NOT /etc/sysctl.conf

Sorry GUYS
back to screwing up openvpn

BTW how do you save the rules when iptables-persistent is loaded, it saves on install , or do you have to reinstall each time ?
BR
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Re: openvpn server

Unread postby richard-g8jvm » Sat Sep 15, 2018 3:01 am

Dont know where my reply went ??

again

I've followed the link given for setting up a openvpn server and thats up and running , using port 443 not 1194

but the client is giving problems.

starting the client1.ovpn with "sudo openvpn --config client1.ovpn" gives
Code: Select all
richard@richard-Inspiron-N5030:/etc/openvpn$ sudo openvpn --config client1.ovpn
Options error: Unrecognized option or missing or extra parameter(s) in client1.ovpn:142: ---BEGIN (2.4.4)
Use --help for more information.


putting a hash at the beginning of that line just causes an unrecognised option from the first line of the cert

if you uncomment the three lines before that for a linux system
it take ojection to
Code: Select all
richard@richard-Inspiron-N5030:/etc/openvpn$ sudo openvpn --config client1.ovpn
Options error: --down script fails with '/etc/openvpn/update-resolv-conf<ca>': No such file or directory (errno=2)
Options error: Please correct this error.



I could do with some help here please
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Richard G8JVM
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Re: openvpn server

Unread postby mad_ady » Sat Sep 15, 2018 3:22 am

Can you paste your ovpn file anonymizing the key and ip?
Also what is the ovpn version of the client and server?
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Re: openvpn server

Unread postby richard-g8jvm » Sat Sep 15, 2018 3:38 am

Hiya
not sure what you mean by the anonymizing the key and ip, sorry

client version
OpenVPN 2.4.4 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Sep 5 2018
server version
OpenVPN 2.4.4 arm-unknown-linux-gnueabihf [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Sep 5 2018
So they should talk

The script on the link posted by odroid for the client combines the client.conf and the keys on one .ovpn file
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Richard G8JVM
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Re: openvpn server

Unread postby richard-g8jvm » Sat Sep 15, 2018 3:48 am

FOUND IT !!!!!!!!!!!!!! ;)
for some reason

##### Uncomment only when if the client is on a Linux system, and has /etc/openvpn/update-resolv-conf file. #####
script-security 2
up /etc/openvpn/update-resolv-conf
down /etc/openvpn/update-resolv-conf
<ca> <<<<<<<<<<<<<<<<<<<<<this <ca> was on the end of the above line
-----BEGIN CERTIFICATE-----
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Richard G8JVM
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