[dns-operations] ip id from servers

sthaug at nethelp.no sthaug at nethelp.no
Thu Mar 11 08:46:44 UTC 2010

> I can only confirm a few of these from here (Oslo, Norway). What I see
> is pretty bad. *All* of the DNS answers I receive from these 3 servers
> have IP ID 0:
> >   ns-pri.ripe.net.
> > h.gtld-servers.net.
> > sec3.apnic.net.

Some more high volume servers which only use IP ID 0 as seen from here:	b.gtld-servers.net	i.gtld-servers.net	ns1.facebook.com	de1.sophosxl.com	de2.sophosxl.com	ns2.hashserver.cs.trendmicro.com	d.ns.spamhaus.org

Doing a "tcpdump 'ip[4:2]==0'" on a busy recursive name server can be an
enlightening experience.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

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