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Re: Best way to force a TC=1 response?

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From "John Levine" <johnl@iecc.com>
Newsgroups comp.protocols.dns.bind
Subject Re: Best way to force a TC=1 response?
Date 26 May 2020 17:27:44 -0400
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In article <mailman.442.1590526210.942.bind-users@lists.isc.org> you write:
>What's the best way to force an A query via UDP to return a TC=1 result:
>a really long CNAME chain?

I'd suggest lots of AAAA records.  You could do it with A records but you'd
need four times as many

$ dig wordy.examp1e.com aaaa
;; Truncated, retrying in TCP mode.

; <<>> DiG 9.10.6 <<>> wordy.examp1e.com aaaa
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24856
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 187, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;wordy.examp1e.com.		IN	AAAA

;; ANSWER SECTION:
wordy.examp1e.com.	3594	IN	AAAA	2001::1
wordy.examp1e.com.	3594	IN	AAAA	2002::2
wordy.examp1e.com.	3594	IN	AAAA	2003::3
wordy.examp1e.com.	3594	IN	AAAA	2004::4
wordy.examp1e.com.	3594	IN	AAAA	2005::5
wordy.examp1e.com.	3594	IN	AAAA	2006::6
wordy.examp1e.com.	3594	IN	AAAA	2006::7
wordy.examp1e.com.	3594	IN	AAAA	2008::8
wordy.examp1e.com.	3594	IN	AAAA	2009::9
wordy.examp1e.com.	3594	IN	AAAA	200a::a
wordy.examp1e.com.	3594	IN	AAAA	200b::b
wordy.examp1e.com.	3594	IN	AAAA	200c::c
wordy.examp1e.com.	3594	IN	AAAA	200d::d
wordy.examp1e.com.	3594	IN	AAAA	200e::e
wordy.examp1e.com.	3594	IN	AAAA	200f::f
wordy.examp1e.com.	3594	IN	AAAA	2010::10
wordy.examp1e.com.	3594	IN	AAAA	2011::11
wordy.examp1e.com.	3594	IN	AAAA	2012::12
wordy.examp1e.com.	3594	IN	AAAA	2013::13
wordy.examp1e.com.	3594	IN	AAAA	2014::14
wordy.examp1e.com.	3594	IN	AAAA	2015::15
wordy.examp1e.com.	3594	IN	AAAA	2016::16
wordy.examp1e.com.	3594	IN	AAAA	2017::17
wordy.examp1e.com.	3594	IN	AAAA	2018::18
wordy.examp1e.com.	3594	IN	AAAA	2019::19
wordy.examp1e.com.	3594	IN	AAAA	201a::1a
wordy.examp1e.com.	3594	IN	AAAA	201b::1b
wordy.examp1e.com.	3594	IN	AAAA	201c::1c
wordy.examp1e.com.	3594	IN	AAAA	201d::1d
wordy.examp1e.com.	3594	IN	AAAA	201e::1e
wordy.examp1e.com.	3594	IN	AAAA	201f::1f
wordy.examp1e.com.	3594	IN	AAAA	2020::20
wordy.examp1e.com.	3594	IN	AAAA	2021::21
wordy.examp1e.com.	3594	IN	AAAA	2022::22
wordy.examp1e.com.	3594	IN	AAAA	2023::23
wordy.examp1e.com.	3594	IN	AAAA	2024::24
wordy.examp1e.com.	3594	IN	AAAA	2025::25
wordy.examp1e.com.	3594	IN	AAAA	2026::26
wordy.examp1e.com.	3594	IN	AAAA	2027::27
wordy.examp1e.com.	3594	IN	AAAA	2028::28
wordy.examp1e.com.	3594	IN	AAAA	2029::29
wordy.examp1e.com.	3594	IN	AAAA	202a::2a
wordy.examp1e.com.	3594	IN	AAAA	202b::2b
wordy.examp1e.com.	3594	IN	AAAA	202c::2c
wordy.examp1e.com.	3594	IN	AAAA	202d::2d
wordy.examp1e.com.	3594	IN	AAAA	202e::2e
wordy.examp1e.com.	3594	IN	AAAA	202f::2f
wordy.examp1e.com.	3594	IN	AAAA	2030::30
wordy.examp1e.com.	3594	IN	AAAA	2031::31
wordy.examp1e.com.	3594	IN	AAAA	2032::32
wordy.examp1e.com.	3594	IN	AAAA	2033::33
wordy.examp1e.com.	3594	IN	AAAA	2034::34
wordy.examp1e.com.	3594	IN	AAAA	2035::35
wordy.examp1e.com.	3594	IN	AAAA	2036::36
wordy.examp1e.com.	3594	IN	AAAA	2037::37
wordy.examp1e.com.	3594	IN	AAAA	2038::38
wordy.examp1e.com.	3594	IN	AAAA	2039::39
wordy.examp1e.com.	3594	IN	AAAA	203a::3a
wordy.examp1e.com.	3594	IN	AAAA	203b::3b
wordy.examp1e.com.	3594	IN	AAAA	203c::3c
wordy.examp1e.com.	3594	IN	AAAA	203d::3d
wordy.examp1e.com.	3594	IN	AAAA	203e::3e
wordy.examp1e.com.	3594	IN	AAAA	203f::3f
wordy.examp1e.com.	3594	IN	AAAA	2040::40
wordy.examp1e.com.	3594	IN	AAAA	2041::41
wordy.examp1e.com.	3594	IN	AAAA	2042::42
wordy.examp1e.com.	3594	IN	AAAA	2043::43
wordy.examp1e.com.	3594	IN	AAAA	2044::44
wordy.examp1e.com.	3594	IN	AAAA	2045::45
wordy.examp1e.com.	3594	IN	AAAA	2046::46
wordy.examp1e.com.	3594	IN	AAAA	2047::47
wordy.examp1e.com.	3594	IN	AAAA	2048::48
wordy.examp1e.com.	3594	IN	AAAA	2049::49
wordy.examp1e.com.	3594	IN	AAAA	204a::4a
wordy.examp1e.com.	3594	IN	AAAA	204b::4b
wordy.examp1e.com.	3594	IN	AAAA	204c::4c
wordy.examp1e.com.	3594	IN	AAAA	204d::4d
wordy.examp1e.com.	3594	IN	AAAA	204e::4e
wordy.examp1e.com.	3594	IN	AAAA	204f::4f
wordy.examp1e.com.	3594	IN	AAAA	2050::50
wordy.examp1e.com.	3594	IN	AAAA	2051::51
wordy.examp1e.com.	3594	IN	AAAA	2052::52
wordy.examp1e.com.	3594	IN	AAAA	2053::53
wordy.examp1e.com.	3594	IN	AAAA	2054::54
wordy.examp1e.com.	3594	IN	AAAA	2055::55
wordy.examp1e.com.	3594	IN	AAAA	2056::56
wordy.examp1e.com.	3594	IN	AAAA	2057::57
wordy.examp1e.com.	3594	IN	AAAA	2058::58
wordy.examp1e.com.	3594	IN	AAAA	2059::59
wordy.examp1e.com.	3594	IN	AAAA	205a::5a
wordy.examp1e.com.	3594	IN	AAAA	205b::5b
wordy.examp1e.com.	3594	IN	AAAA	205c::5c
wordy.examp1e.com.	3594	IN	AAAA	205d::5d
wordy.examp1e.com.	3594	IN	AAAA	205e::5e
wordy.examp1e.com.	3594	IN	AAAA	205f::5f
wordy.examp1e.com.	3594	IN	AAAA	2060::60
wordy.examp1e.com.	3594	IN	AAAA	2061::61
wordy.examp1e.com.	3594	IN	AAAA	2062::62
wordy.examp1e.com.	3594	IN	AAAA	2063::63
wordy.examp1e.com.	3594	IN	AAAA	2064::64
wordy.examp1e.com.	3594	IN	AAAA	2065::65
wordy.examp1e.com.	3594	IN	AAAA	2066::66
wordy.examp1e.com.	3594	IN	AAAA	2067::67
wordy.examp1e.com.	3594	IN	AAAA	2068::68
wordy.examp1e.com.	3594	IN	AAAA	2069::69
wordy.examp1e.com.	3594	IN	AAAA	206a::6a
wordy.examp1e.com.	3594	IN	AAAA	206b::6b
wordy.examp1e.com.	3594	IN	AAAA	206c::6c
wordy.examp1e.com.	3594	IN	AAAA	206d::6d
wordy.examp1e.com.	3594	IN	AAAA	206e::6e
wordy.examp1e.com.	3594	IN	AAAA	206f::6f
wordy.examp1e.com.	3594	IN	AAAA	2070::70
wordy.examp1e.com.	3594	IN	AAAA	2071::71
wordy.examp1e.com.	3594	IN	AAAA	2072::72
wordy.examp1e.com.	3594	IN	AAAA	2073::73
wordy.examp1e.com.	3594	IN	AAAA	2074::74
wordy.examp1e.com.	3594	IN	AAAA	2075::75
wordy.examp1e.com.	3594	IN	AAAA	2076::76
wordy.examp1e.com.	3594	IN	AAAA	2077::77
wordy.examp1e.com.	3594	IN	AAAA	2078::78
wordy.examp1e.com.	3594	IN	AAAA	2079::79
wordy.examp1e.com.	3594	IN	AAAA	207a::7a
wordy.examp1e.com.	3594	IN	AAAA	207b::7b
wordy.examp1e.com.	3594	IN	AAAA	207c::7c
wordy.examp1e.com.	3594	IN	AAAA	207d::7d
wordy.examp1e.com.	3594	IN	AAAA	207e::7e
wordy.examp1e.com.	3594	IN	AAAA	207f::7f
wordy.examp1e.com.	3594	IN	AAAA	2080::80
wordy.examp1e.com.	3594	IN	AAAA	2081::81
wordy.examp1e.com.	3594	IN	AAAA	2082::82
wordy.examp1e.com.	3594	IN	AAAA	2083::83
wordy.examp1e.com.	3594	IN	AAAA	2084::84
wordy.examp1e.com.	3594	IN	AAAA	2085::85
wordy.examp1e.com.	3594	IN	AAAA	2086::86
wordy.examp1e.com.	3594	IN	AAAA	2087::87
wordy.examp1e.com.	3594	IN	AAAA	2088::88
wordy.examp1e.com.	3594	IN	AAAA	2089::89
wordy.examp1e.com.	3594	IN	AAAA	208a::8a
wordy.examp1e.com.	3594	IN	AAAA	208b::8b
wordy.examp1e.com.	3594	IN	AAAA	208c::8c
wordy.examp1e.com.	3594	IN	AAAA	208d::8d
wordy.examp1e.com.	3594	IN	AAAA	208e::8e
wordy.examp1e.com.	3594	IN	AAAA	208f::8f
wordy.examp1e.com.	3594	IN	AAAA	2090::90
wordy.examp1e.com.	3594	IN	AAAA	2091::91
wordy.examp1e.com.	3594	IN	AAAA	2092::92
wordy.examp1e.com.	3594	IN	AAAA	2093::93
wordy.examp1e.com.	3594	IN	AAAA	2094::94
wordy.examp1e.com.	3594	IN	AAAA	2095::95
wordy.examp1e.com.	3594	IN	AAAA	2096::96
wordy.examp1e.com.	3594	IN	AAAA	2097::97
wordy.examp1e.com.	3594	IN	AAAA	2098::98
wordy.examp1e.com.	3594	IN	AAAA	2099::99
wordy.examp1e.com.	3594	IN	AAAA	209a::9a
wordy.examp1e.com.	3594	IN	AAAA	209b::9b
wordy.examp1e.com.	3594	IN	AAAA	209c::9c
wordy.examp1e.com.	3594	IN	AAAA	209d::9d
wordy.examp1e.com.	3594	IN	AAAA	209e::9e
wordy.examp1e.com.	3594	IN	AAAA	209f::9f
wordy.examp1e.com.	3594	IN	AAAA	20a0::a0
wordy.examp1e.com.	3594	IN	AAAA	20a1::a1
wordy.examp1e.com.	3594	IN	AAAA	20a2::a2
wordy.examp1e.com.	3594	IN	AAAA	20a3::a3
wordy.examp1e.com.	3594	IN	AAAA	20a4::a4
wordy.examp1e.com.	3594	IN	AAAA	20a5::a5
wordy.examp1e.com.	3594	IN	AAAA	20a6::a6
wordy.examp1e.com.	3594	IN	AAAA	20a7::a7
wordy.examp1e.com.	3594	IN	AAAA	20a8::a8
wordy.examp1e.com.	3594	IN	AAAA	20a9::a9
wordy.examp1e.com.	3594	IN	AAAA	20aa::aa
wordy.examp1e.com.	3594	IN	AAAA	20ab::ab
wordy.examp1e.com.	3594	IN	AAAA	20ac::ac
wordy.examp1e.com.	3594	IN	AAAA	20ad::ad
wordy.examp1e.com.	3594	IN	AAAA	20ae::ae
wordy.examp1e.com.	3594	IN	AAAA	20af::af
wordy.examp1e.com.	3594	IN	AAAA	20b0::b0
wordy.examp1e.com.	3594	IN	AAAA	20b1::b1
wordy.examp1e.com.	3594	IN	AAAA	20b2::b2
wordy.examp1e.com.	3594	IN	AAAA	20b3::b3
wordy.examp1e.com.	3594	IN	AAAA	20b4::b4
wordy.examp1e.com.	3594	IN	AAAA	20b5::b5
wordy.examp1e.com.	3594	IN	AAAA	20b6::b6
wordy.examp1e.com.	3594	IN	AAAA	20b7::b7
wordy.examp1e.com.	3594	IN	AAAA	20b8::b8
wordy.examp1e.com.	3594	IN	AAAA	20b9::b9
wordy.examp1e.com.	3594	IN	AAAA	20ba::ba
wordy.examp1e.com.	3594	IN	AAAA	20bb::bb

;; Query time: 0 msec
;; SERVER: 192.168.80.2#53(192.168.80.2)
;; WHEN: Tue May 26 17:24:43 EDT 2020
;; MSG SIZE  rcvd: 5282

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Thread

Best way to force a TC=1 response? Fred Morris <m3047@m3047.net> - 2020-05-26 13:50 -0700
  Re: Best way to force a TC=1 response? "John Levine" <johnl@iecc.com> - 2020-05-26 17:27 -0400

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