fix: direct embedded derp traffic directly to the server #6595
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mafredri
approved these changes
Mar 14, 2023
coderd/workspaceagents.go
Outdated
| Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(), 128)}, | ||
| DERPMap: derpMap, | ||
| Logger: api.Logger.Named("tailnet"), | ||
| BlockEndpoints: true, |
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Why do we set BlockEndpoints now? I'm sure there's a reason, just wondering. 😄
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This is a mistake! Fantastic catch 🥴🥴🥴
| }) | ||
| if err != nil { | ||
| _ = clientConn.Close() | ||
| _ = serverConn.Close() | ||
| return nil, xerrors.Errorf("create tailnet conn: %w", err) | ||
| } | ||
| conn.SetDERPRegionDialer(func(_ context.Context, region *tailcfg.DERPRegion) net.Conn { |
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There's a comment above in the code that seems outdated now?
// TODO: This should dial directly to execute the
// DERP server instead of contacting localhost.
//
// This requires modification of Tailscale internals
// to pipe through a proxy function per-region, so
// this is an easy and mostly reliable hack for now.
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Great point! I'm happy we're able to take out a TODO!
Prior to this change, DERP traffic would route from `coderd` to the `CODER_ACCESS_URL` to reach the internal DERP server, which may have resulted in slower connections due to proxying, or the failure of web traffic entirely. If your Coder deployment has a proxy in front of it, your traffic through web terminals, apps, and port-forwarding is about to get a lot faster!
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Prior to this change, DERP traffic would route from
coderdto theCODER_ACCESS_URLto reach the internal DERP server, which may have resulted in slower connections due to proxying, or the failure of web traffic entirely.If your Coder deployment has a proxy in front of it, your traffic through web terminals, apps, and port-forwarding is about to get a lot faster!
See coder/tailscale#13