Build an MS compatible L2TP/Ipsec VPN client on Fedora 33

After installing Fedora 33 Since it is a test, promote it to root

sudo passwd root
su

yum install -y xl2tpd NetworkManager-l2tp NetworkManager-l2tp-gnome

Fedora 33 seems to use libreswan for ipsec, eliminating vulnerable algorithms. It seems that the excluded algorithm is used in MS compatible L2TP/IPsec, so change it to strongswan.

yum remove libreswan
yum install -y strongswan

Reference information 6 VPNs https://opensource.com/article/18/8/open-source-tools-vpn https://www.tecmint.com/setup-l2tp-ipsec-vpn-client-in-linux/

MS Azure L2TP configuration https://network.yamaha.com/setting/router_firewall/cloud/microsoft_azure/setup_rt

Fedora & Algorithm https://ask.fedoraproject.org/t/cannot-connect-to-vpn/5602/42

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