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| author | Rasmus Dahlberg <rasmus@rgdd.se> | 2023-04-02 11:54:09 +0200 |
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| committer | Rasmus Dahlberg <rasmus@rgdd.se> | 2023-04-02 11:54:09 +0200 |
| commit | d706c7a3b35f48225cfe7dc91960e58657056bbe (patch) | |
| tree | 48fc81f78a72d22f5a70dc890d2ba31f0a948557 | |
| parent | 6f0064b1401788dcc91fcd54da3b4702734b13c3 (diff) | |
Add notes
| -rw-r--r-- | README.md | 15 |
1 files changed, 15 insertions, 0 deletions
@@ -135,6 +135,21 @@ used here in a subsequent run. For example, with `-C 60s` and an average of 100 domains/s, it would be wise to roll-back _at least_ 6000 lines. This should be a last-resort option, and is mainly here to sanity-check long measurements. +### Misc notes + +We use the default `net.Dial` function, which in turn uses +[goLookupIPCNAMEOrder][] for DNS lookups with the recursive name servers in +`/etc/resolve.conf`. For example, with + + $ cat /etc/resolve.conf + nameserver 8.8.8.8 + nameserver 8.8.4.4 + +the query will first be directed to `8.8.8.8`; then `8.8.4.4` if no valid answer +is available yet ([lines 663-778][]). + +[goLookupIPCNAMEOrder]: https://github.com/golang/go/blob/8edcdddb23c6d3f786b465c43b49e8d9a0015082/src/net/dnsclient_unix.go#L595-L804 +[lines 663-778]: https://github.com/golang/go/blob/8edcdddb23c6d3f786b465c43b49e8d9a0015082/src/net/dnsclient_unix.go#L663-L778 ## Contact |