Currently I am connecting to a VPN that provides a few DNS search
entries. One of these domains on the search path is having DNS
resolution problems. This is not per se the the problem I am writing
this email for.
The problem is that starting Firefox and Thunderbird take a long time,
it took time to detect the DNS resolution problem was the origin of
these timeouts. I am not using that domain that is having resolution
problems.
The real culprit is the default `fedora` hostname, instead of localhost.
Starting a Wireshark capture there are DNS searches for
fedora.domain_failing.tld, when starting Firefox and Thunderbird. The
presence of the search path on generated /etc/resolv.conf isn't the
cause of these DNS searches, I edited them out while the VPN was still
active.
Even 'ping fedora' start doing these searches with the search paths
appended. 'ping localhost' doesn't do that. The only workaround to this
issue is to add fedora to the localhost entries on /etc/hosts.
This in some way is a DNS leak, even on a VPN with perfectly working DNS
resolution, the fedora name should not be searched on these domains
until I am using the fedora full hostname on these domains. Even worse
when simply starting applications like Firefox o Thunderbird.
Maybe changing the default hostname to fedora wasn't a good idea after
all, or at least fedora should be added to the default /etc/hosts.
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