If you have configured an external BGP router, the BGP-EVPN routes (10.0.1.0/24
and 10.0.2.0/24 in this example), will be announced dynamically.
+
+
+Notes
+-----
+
+Vxlan Encryption
+~~~~~~~~~~~~~~~~
+If you need to add encryption on top of vxlan, it's possible to do it with strongswan software.
+You'll need to reduce the mtu around 60bytes (ipv4) or 80bytes (ipv6) to handle encryption.
+
+So with default 1500 mtu, you need mtu 1370 (1370 + 80bytes ipsec + 50 bytes vxlan).
+
+
+Install strongwan
+----
+apt install strongwan
+----
+
+Add configuration in /etc/ipsec.conf.
+(Encrypt only vxlan udp port 4789)
+
+----
+conn %default
+ ike=aes256-sha1-modp1024! #the fastest (but reasonably secure)cipher on reasonably modern hardware
+ esp=aes256-sha1!
+ leftfirewall=yes # this is necessary when using Proxmox firewall rules
+
+conn output
+ rightsubnet=%dynamic[udp/4789]
+ right=%any
+ type=transport
+ authby=psk
+ auto=route
+
+conn input
+ leftsubnet=%dynamic[udp/4789]
+ type=transport
+ authby=psk
+ auto=route
+----
+
+Then generate a preshared key with
+
+----
+openssl rand -base64 128
+----
+
+and copy the key in /etc/ipsec.secrets
+
+----
+: PSK <generatedbase64key>
+----