On 2022-05-16, Alexander Bochmann <[email protected]> wrote: > Hi, > > ...on 2022-05-16 13:23:31, Philipp Buehler wrote: > > > I cannot recall many applications from 20y ago that have been very keen > > on sending from certain ports (besides IKE already mentioned by JJ). > > I seem to remember firewall rules that allowed only udp/53 as _source_ port > for DNS traffic. > > Might have been more than 20 years ago.
Such rules often existed to cover replies, before the days of stateful firewalls.
