[dns-operations] TCP Revisited
anandb at ripe.net
Mon Jun 29 12:33:07 UTC 2009
On 26/6/09 16:29, Michael Graff wrote:
> While doing some DNSSEC things today, I found that one server in the
> e164.arpa zone behaved in a somewhat unfriendly way. e164.arpa is a
> signed zone, and therefore all the DNS servers for that zone should be
> capable of serving DNSSEC data.
> One server, e164-arpa.cnnic.net.cn with address 18.104.22.168, does not
> respond to queries with DO set nor does it respond to queries over TCP.
> % dig @22.214.171.124 e164.arpa. dnskey
> results in TC, failed TCP
> % dig @126.96.36.199 e164.arpa. dnskey +vc
> results in a timeout.
> % dig @188.8.131.52 e164.arpa. dnskey +dnssec
> times out. tcpdump shows no response at all.
> I have attempted to contact RIPE about this since they are the primary
> for this zone.
This issue has now been resolved. It turns out that TCP/53 had been blocked. It
is now open again, and the server answers queries over TCP.
DNS Services Manager, RIPE NCC
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