Comment by mintflow

Recently my multiple VPN server nodes just randomly cannot connect to cloudflare CDN IPs, from different provider VPS, while the Host Linux network does not have the issue; vpp share the same address with Linux and use tc stateless NAT to do the trick.

I finally work around this by change the tcp options sent by vpp tcp stack.

But the whole thing made me worry there must be something deployed which cause this issue.

But I do not think that related with this network issue, it just reminds me the above, I feel there are frequently new articles about cloudflare networking, maybe new method or new deployment sort of related high probability of issues