Does dnsdist shuffle responses in packet cache?

[karelbilek]

Does dnsdist shuffle responses served from packet cache?

Similarly how dnsmasq does it (and it's possible to turn off by no-round-robin).

And if not, should it do that?

[rgacogne]

No, it does not. We don't want to pay the cost of having to parse the DNS payload to shuffle the records around.

[karelbilek]

Interesting. But the DNS payload needs to be parsed to do the aging, if dontAge = false?

[rgacogne]

Not the whole payload is parsed, we don't need to look at the rdata to update the TTL.

[karelbilek]

You are correct. OK thank you.

[karelbilek]

I might eventually need this feature and might take a shot at adding it to dnsdist, with some optional config flag of course (to not take a hit).

[karelbilek]

If I actually really need it, I might add it as a separate lua Action and add it around here

pdns/pdns/dnsdistdist/dnsdist-dnsparser.cc

Line 67 in 69d285c

bool changeNameInDNSPacket(PacketBuffer& initialPacket, const DNSName& from, const DNSName& to)