diff options
Diffstat (limited to 'plugin/forward')
| -rw-r--r-- | plugin/forward/README.md | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/plugin/forward/README.md b/plugin/forward/README.md index cc1845377..b4307d8dd 100644 --- a/plugin/forward/README.md +++ b/plugin/forward/README.md @@ -9,8 +9,10 @@ The *forward* plugin re-uses already opened sockets to the upstreams. It supports UDP, TCP and DNS-over-TLS and uses in band health checking. -When it detects an error a health check is performed. This checks runs in a loop, every *0.5s*, for -as long as the upstream reports unhealthy. Once healthy we stop health checking (until the next +When it detects an error a health check is performed. This checks runs in a loop, +starting with a *0.5s* interval and exponentially backing off with randomized intervals +up to *60s* for as long as the upstream reports unhealthy. The exponential backoff +will reset to *0.5s* after 15 minutes. Once healthy we stop health checking (until the next error). The health checks use a recursive DNS query (`. IN NS`) to get upstream health. Any response that is not a network error (REFUSED, NOTIMPL, SERVFAIL, etc) is taken as a healthy upstream. The health check uses the same protocol as specified in **TO**. If `max_fails` is set to 0, no checking |