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--- network_stuff:vpn_troubleshooting [2018/01/19 21:09] – jotasandoku
+++ network_stuff:vpn_troubleshooting [2023/11/02 14:38] (current) – external edit 127.0.0.1
@@ Line 41: / Line 41: @@
   * http://www.fir3net.com/Checkpoint/how-do-i-create-an-ssl-vpn-on-a-checkpoint-gateway.html
-**OPENVPN**
+**OPENVPN SERVER FEDORA**
   * **Installation**: [[https://chichivica.github.io/2017/08/02/Install-OpenVPN-on-Fedora-26/]]
     *  pki, ca, server and client cert (after being generated) + configuration , in : /etc/openvpn/server
@@ Line 57: / Line 57: @@
   # also enable ip forwarding with sysctl.conf and don't forget systemctl restart network.service
-**Operation**\\
+Start server:
   systemctl start openvpn-server@server.service # Server
-  openvpn --config /home/jotasan/client1.ovpn  # client
+Create ovpn file and start client:
+[[https://gist.github.com/dmytro/0606cb32e42fc0918466|generate_openvpn_config.sh]]
+  openvpn --config /home/jaime/ovpnrpi/client4.ovpn  # client
 If redirection fails:\\
+  systemctl stop firewalld
+  systemctl start firewalld
+----
+**OPENWRT CLIENT OPENVPN**:\\
+In LuCi:
+  * Click Update-list
+  * Then INSTALL: luci-app-openvpn openvpn-easy-rsa openvpn-openssl
+  * Press OK on each of them to download and install them.
+In CLI, Have these files:
+  root@OpenWrt:/etc/config# cat /etc/config/openvpn
+  config openvpn 'camarreal_ovpn'
+    option config '/etc/openvpn/forsythia-client.ovpn'   # This is 'raw' the file generated in the openvpn server by doing "pivpn add nopass"
+    option enabled '1'
+Firewall and network config (from [[https://wiki.turris.cz/doc/en/howto/openvpn]] among other sources):
+  root@OpenWrt:/etc/config# cat /etc/config/firewall
+  config zone 'wan'
+          option name 'wan'
+          list network 'wan'
+          list network 'wan6'
+          option output 'ACCEPT'
+          option forward 'REJECT'
+          option masq '1'
+          option mtu_fix '1'
+          option input 'REJECT'
+          list device 'tun0'
+  root@OpenWrt:/etc/config# cat /etc/config/network
+  config interface 'vpn'
+          option proto 'none'
+          option ifname 'tun0'
+----
+LINUX VPN-CLIENT\\
+[[https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/clients.md#linux]]
+\\
+START:\\
+  mkdir -p /var/run/xl2tpd
+  touch /var/run/xl2tpd/l2tp-control
+  service strongswan restart
+  service xl2tpd restart
+  strongswan up myvpn
+  echo "c myvpn" > /var/run/xl2tpd/l2tp-control
+  ip route add 0/0 dev ppp0
+\\
+STOP:\\
+  ip route del 0/0 dev ppp0
+  echo "d myvpn" > /var/run/xl2tpd/l2tp-control
+  strongswan down myvpn
+INVESTIGATE WHY CRASHES SOMETIMES:
+  May  9 05:16:22 observium xl2tpd: xl2tpd[23954]: Maximum retries exceeded for tunnel 23919.  Closing.
+  May  9 05:16:22 observium xl2tpd: xl2tpd[23954]: Connection 61860 closed to 148.64.56.150, port 1701 (Timeout)
+LIBRESWAN STRONGSWAN NOTES:
+  * [[https://docs.cloud.mycompany2.com/en-us/iaas/Content/Network/Concepts/libreswan.htm]]
+  * [[https://dc77312.wordpress.com/2019/01/08/libreswan-ipsec-vpn-on-centos-7-and-windows-10/]]
+  * pluto is is an IKE ("IPsec Key Exchange") daemon
+  yum install libreswan
+  ipsec initnss
+  systemctl enable ipsec
+  systemctl start ipsec
+  # Use this to add and bring up the tunnel and see the exchange!
+  ipsec auto --add mycompany2-tunnel-1
+  ipsec auto --up mycompany2-tunnel-1
+  * In the vnic: "tick skip Source/Dest Checks"
+  * modify  /etc/sysctl.conf for forwarding [[https://www.tecmint.com/setup-ipsec-vpn-with-strongswan-on-centos-rhel-8/|External Link]]. In '/etc/sysctl.d' create a file named 50-libreswan.conf with that content
+  # https://libreswan.org/man/ipsec.conf.5.html
+  conn mycompany2-tunnel-1
+       left=10.156.0.23
+       # leftid=193.123.39.207 # This is the public IP (nat-t)
+       right=148.64.56.151
+       authby=secret
+       leftsubnet=10.181.181.0/24
+       rightsubnet=10.8.0.8/23
+       auto=start
+       mark=5/0xffffffff # Needs to be unique across all tunnels
+       vti-interface=vti0
+       vti-routing=no
+       ikev2=insist # To use IKEv2, change to ikev2=insist
+       ike=aes_cbc256-sha2_384;modp1536     # "cipher-hash;modpgroup,.."IKE encryption/authentication algorithm (and dh-modpgroup) to be used for the connection (phase 1 aka ISAKMP SA).
+       phase2alg=aes_gcm256;modp1536  # (alias esp) . Algorithms that will be offered/accepted for a phase2 negotiatio (~transform set) .format for ESP is ENC-AUTH followed by one optional PFSgroup. For instance, "3des-md5" or "aes256-sha1;modp2048" or "aes-sha1,aes-md5". When specifying multiple algorithms, specify the PFSgroup last, e.g. "3des-md5,aes256-sha1;modp2048".
+       encapsulation=yes
+       ikelifetime=28800s
+       salifetime=3600s
+  cat /etc/ipsec.d/oci-ipsec.secrets
+  my-pub-ip x-end-pub-ip : PSK "a64-charslongrandomstringgeneratedwithpwgenoropensslorothertool"
+----
+CLASSY IPSEC-VPN TROUBLESHOOT:
+  * [[http://www.twine-networks.com/blog/posts/5-troubleshooting-ipsec-log-messages]]
+  * [[https://www.blackhole-networks.com/IKE_Modes/ikev1-quick.html]]

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