Hi All, On 11/2/20 3:41 PM, Emeric Brun wrote: > Hi All, > > We are currently studying to develop a DNS messages load balancer (into > haproxy core) > > After a global pass on RFCs (DNS, DNS over TCP, eDNS, DNSsec ...) we noticed > that practices on DNS have largely evolved > since stone age. > > Since the last brainstorm meeting I had with Baptiste Assmann and Willy > Tarreau, we were attempted to make some > assumptions and choices and we want to submit them to community to have your > thoughts. > > Reading RFCs, I notice multiple fallback cases (if server not support eEDNS > we should retry request without eDNS or if response > is truncated we should retry over TCP) which could clearly make the project > really difficult to implement and sub optimal on > performances point of view. > > So we decide to make the assumption that nowadays, all modern DNS servers > support both TCP (and pipelined requests > as defined in rfc 7766) and eDNS. In this case the DNS loadbalancer will > forward messages received from clients in UDP > or TCP (supporting eDNS or not) to server via pipelined TCP conn. > > We are requesting the community and experienced users of DNS servers to share > their thoughts about this.
sub-questions are about modern DNS servers: - do they support DNS over TCP? - do they support persistent connections with pipelined requests? R, Emeric
