A little more, from Comcast SF bay area:
Its responding to large EDNS MTUs just fine for me:
dig +dnssec any . @m.root-servers.net
works (4096B MTU)
but with a 512B MTU (no EDNS) it doesn't because there is no working TCP:
dig any . @m.root-servers.net
;; Truncated, retrying in TCP mode.
;; Connection to 2001:dc3::35#53(2001:dc3::35) for . failed: host unreachable.
;; communications error to 202.12.27.33#53: connection reset
And its not an IPv6 error, nor specific to the ANY query for the instance I'm
connecting to, because:
dig +tcp NS . @202.12.27.33
;; communications error to 202.12.27.33#53: connection reset
Traceroute for me (comcast, SF bay area):
8 pos-0-0-0-0-pe01.11greatoaks.ca.ibone.comcast.net (68.86.86.54) 18.236 ms
19.293 ms 18.971 ms
9 xe-9-3-0-0.sjc10.ip4.tinet.net (213.200.80.165) 18.936 ms 17.631 ms
18.901 ms
10 xe-0-0-0.par20.ip4.tinet.net (89.149.187.165) 188.885 ms 170.598 ms
xe-1-0-0.par20.ip4.tinet.net (89.149.187.169) 187.812 ms
11 213.200.76.38 (213.200.76.38) 174.631 ms 171.042 ms 170.649 ms
12 * 213.200.76.38 (213.200.76.38) 171.488 ms !X *
13 * 213.200.76.38 (213.200.76.38) 174.952 ms !X *
14 213.200.76.38 (213.200.76.38) 172.172 ms !X
* 175.036 ms !X
My net has no filtering that I know of on DNS, either UDP or TCP:
http://n1.netalyzr.icsi.berkeley.edu/restore/id=43ca253f-32397-7e23ee37-14c3-4026-9f6b/rd
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