[dnsdist] DoH pool servers and packet cache usage

denis.machard at orange.com denis.machard at orange.com
Fri Oct 1 07:07:14 UTC 2021


Hi,

I am trying to use DoH backends the new alpha release of dnsdist 1.7.0
I had a behavior I don't understand with the packet cache, here the configuration used:

            setLocal("0.0.0.0:53", {])
pc = newPacketCache(10000, {})
pool_resolv = "resolvers"
caStore = "/etc/dnsdist/conf.d/tls-ca-bundle.pem"

-- members definitions
newServer({
  address = "1.1.1.1:443<http://1.1.1.1:443>",
  tls = "openssl",
  dohPath = "/dns-query",
  caStore = caStore,
  subjectName = "cloudflare-dns.com<http://cloudflare-dns.com>",
  validateCertificates = true,
  pool = pool_resolv,
})

newServer({
  address = "8.8.8.8:443<http://8.8.8.8:443>",
  tls = "openssl",
  dohPath = "/dns-query",
  caStore = caStore,
  subjectName = "dns.google",
  validateCertificates = true,
  pool = pool_resolv,
})

setPoolServerPolicy(roundrobin, pool_resolv)
getPool(pool_resolv):setCache(pc)

With this configuration, I don't succeed to use the packet cache with incoming UDP dns queries, in the other hand its ok with TCP dns queries
This is the expected behavior for you or perhaps I missed something?

Denis


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