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cmd/netcheck: better DERP latency checking output 

Fixes #206

Signed-off-by: Zijie Lu <zijie@tailscale.com>
This commit is contained in:
Zijie Lu 2020-05-05 15:03:18 -04:00 committed by halulu
parent 46f4b18fe8
commit e3559d1c45
1 changed files with 17 additions and 9 deletions
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8
cmd/tailscale/netcheck.go
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@ -51,6 +51,13 @@ func runNetcheck(ctx context.Context, args []string) error {
}
fmt.Printf("\t* MappingVariesByDestIP: %v\n", report.MappingVariesByDestIP)
fmt.Printf("\t* HairPinning: %v\n", report.HairPinning)
// When DERP latency checking failed,
// magicsock will try to pick the DERP server that
// most of your other nodes are also using
if len(report.DERPLatency) == 0 {
fmt.Printf("\t* Nearest DERP: unknown (no response to latency probes)\n")
} else {
fmt.Printf("\t* Nearest DERP: %v (%v)\n", report.PreferredDERP, c.DERP.LocationOfID(report.PreferredDERP))
fmt.Printf("\t* DERP latency:\n")
var ss []string
@ -61,5 +68,6 @@ func runNetcheck(ctx context.Context, args []string) error {
for _, s := range ss {
fmt.Printf("\t\t- %s = %v\n", s, report.DERPLatency[s])
}
}
return nil
}