📝 Redirecting Egress Packets Through Cloudflare Tunnels via eBPF Program on Linux

[victorstewart]

not sure how to classify this, but chose documentation.

i use Cloudflare tunnels to expose my dev cluster to the Internet. packets come into through a tunnel, and then get redirected into an XDP load balancer on the physical NIC... which will either push the packet to another machine on the subnet or redirect it into the network namespace of a container.

my problem now is figuring out how i can use an eBPF program to redirect "response" packets back through either that same tunnel or another tunnel on another machine?

hoping this isn't impossible without switching to WARP connectors.

[victorstewart]

it seems like cloudflare tunnels capture outgoing packets by hijacking the local DNS resolver... if so then as long as i dump the packet on any local egress interface i should be good... will report back.