Nico we know of the following reasons from our own experience: - BGP routing issues (ex from Provider 1 you can reach target and from provider 2 not) - per SRC limits on the recipient side
and there for sure are many other reasons we have not experienced (yet) :-) Thats why we thought it would be nice to offload such queries onto an other resolver, with another provider or from a different AS Cheers -- tobi Am 20.05.19 um 18:19 schrieb Nico CARTRON: > Hi, > > On 20-May-2019 16:04 CEST, <pdns-users@mailman.powerdns.com> wrote: > >>> wonder if the following is possible somehow with pdns-recursor. Our main >>> recursor A sometimes has problems talking to some auth servers. In the >>> same time another recursor B in our network still can talk to such an >>> auth server. >>> >>> So we wonder if we could somehow send queries for such auth servers via >>> the other recursor. The decission to send queries to the other box is >>> based on the IP address of the auth server. The idea is to route such >>> queries from recursor A to recursor B while all other queries from >>> recursor A should still be sent without recursor B. >>> >>> Is something like that possible in pdns-rescursor or do we have to use a >>> tool like dnsdist? >> >> Hi Tobi, >> >> I recommend using dnsdist for this use-case! Sending traffic to backend dns >> servers is what dnsdist is made for! > > While it's true that what Frank suggested is totally doable with dnsdist (and > actually one of its missions), it would be interesting though to understand > why > one of your recursors has issues to reach the authoritative server, and > another > recursor has no issue. > > A couple of questions: > - are they running the same Recursor version? > - are they on the same network / same site / faced by the same network > equipments, if any (e.g. firewall) / any ACL in place > - which OS are they running (if differences between the 2) > > Cheers, > _______________________________________________ Pdns-users mailing list Pdns-users@mailman.powerdns.com https://mailman.powerdns.com/mailman/listinfo/pdns-users
