Several hosts behind a caching resolver

[Victor Sudakov]

Dear Colleagues,

Several hosts of the local network use a FreeBSD server with BIND or
local-unbound as a caching resolver. Let's call it "Resolver A."
Resolver A forwards all queries to another resolver, e.g. 8.8.8.8 or
some other, let's call it "Resolver B."

Can the operator of Resolver B figure out how many clients there are
behind Resolver A, or obtain any other information about the hosts on
the said local network (like their operating system etc)? In other
words, does Resolver A effectively anonymize the queries, or is some
information about the internal network leaking?

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49 at fidonet http://vas.tomsk.ru/
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 455 bytes
Desc: not available
URL: <http://lists.freebsd.org/pipermail/freebsd-net/attachments/20191124/b637b9ea/attachment.sig>