widely compatible strongSwan config

ipsec.conf

# ipsec.conf - strongSwan IPsec configuration file

config setup
    charondebug="ike 4, knl 4, cfg 4, net 4, esp 4, dmn 4,  mgr 4"

conn %default
    keyexchange=ikev2
    ike=aes128-sha1-modp1024,aes128-sha1-modp1536,aes128-sha1-modp2048,aes128-sha256-ecp256,aes128-sha256-modp1024,aes128-sha256-modp1536,aes128-sha256-modp2048,aes256-aes128-sha256-sha1-modp2048-modp4096-modp1024,aes256-sha1-modp1024,aes256-sha256-modp1024,aes256-sha256-modp1536,aes256-sha256-modp2048,aes256-sha256-modp4096,aes256-sha384-ecp384,aes256-sha384-modp1024,aes256-sha384-modp1536,aes256-sha384-modp2048,aes256-sha384-modp4096,aes256gcm16-aes256gcm12-aes128gcm16-aes128gcm12-sha256-sha1-modp2048-modp4096-modp1024,3des-sha1-modp1024!
    esp=aes128-aes256-sha1-sha256-modp2048-modp4096-modp1024,aes128-sha1,aes128-sha1-modp1024,aes128-sha1-modp1536,aes128-sha1-modp2048,aes128-sha256,aes128-sha256-ecp256,aes128-sha256-modp1024,aes128-sha256-modp1536,aes128-sha256-modp2048,aes128gcm12-aes128gcm16-aes256gcm12-aes256gcm16-modp2048-modp4096-modp1024,aes128gcm16,aes128gcm16-ecp256,aes256-sha1,aes256-sha256,aes256-sha256-modp1024,aes256-sha256-modp1536,aes256-sha256-modp2048,aes256-sha256-modp4096,aes256-sha384,aes256-sha384-ecp384,aes256-sha384-modp1024,aes256-sha384-modp1536,aes256-sha384-modp2048,aes256-sha384-modp4096,aes256gcm16,aes256gcm16-ecp384,3des-sha1!
    dpdaction=clear
    dpddelay=300s
    type=tunnel
    rekey=no
    left=%any
    leftid=myhost.net
    leftsubnet=0.0.0.0/0
    leftcert=/etc/ipsec.d/certs/vpn-server-cert.pem
    right=%any
    rightsourceip=10.10.10.0/24

conn IPSec-IKEv2
    keyexchange=ikev2
    leftauth=pubkey
    rightauth=pubkey
    leftsendcert=always
    auto=add

conn IPSec-IKEv2-EAP
    keyexchange=ikev2
    leftauth=pubkey
    leftsendcert=always
    rightauth=eap-mschapv2
    rightsendcert=never
    eap_identity=%any
    auto=add

conn CiscoIPSec
    keyexchange=ikev1
    rightauth=pubkey
    rightauth2=xauth
    auto=add