Test if a name server supports EDNS - Revision history

Hutch: /* Other tests */

2008-08-18T20:18:11Z

Other tests

←Older revision		Revision as of 20:18, 18 August 2008
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	'''; EDNS: version: 0, flags:; udp: 4096'''		'''; EDNS: version: 0, flags:; udp: 4096'''

-	== ~~Other tests~~ ==	+	== Links ==
		+
		+	* [http://groups.google.com/group/comp.protocols.dns.bind/msg/439cf16f4940a0bc Too many timeouts resolving / disabling EDNS messages]

Hutch at 20:15, 18 August 2008

2008-08-18T20:15:48Z

←Older revision		Revision as of 20:15, 18 August 2008
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	''';; OPT PSEUDOSECTION:'''		''';; OPT PSEUDOSECTION:'''
	'''; EDNS: version: 0, flags:; udp: 4096'''		'''; EDNS: version: 0, flags:; udp: 4096'''
		+
		+	== Other tests ==

Hutch at 20:11, 18 August 2008

2008-08-18T20:11:03Z

←Older revision		Revision as of 20:11, 18 August 2008
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	When testing a name server, make sure to send a query that will result in authoritative answer. For example, if '''ns.example.com''' is authoritative for '''example.com''', send a query such as '''example.com soa'''. Sending a query for something like '''. ns''' to the name server will result in a timeout when specifying '''+edns=0'''.		When testing a name server, make sure to send a query that will result in authoritative answer. For example, if '''ns.example.com''' is authoritative for '''example.com''', send a query such as '''example.com soa'''. Sending a query for something like '''. ns''' to the name server will result in a timeout when specifying '''+edns=0'''.

-	=== dig +edns ===	+	== dig +edns ==

	* If your version of '''dig''' supports '''+edns=#''', use the following:		* If your version of '''dig''' supports '''+edns=#''', use the following:

Hutch: /* dig +bufsize */

2008-08-18T20:10:51Z

dig +bufsize

←Older revision		Revision as of 20:10, 18 August 2008
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	'''; EDNS: version: 0, flags:; udp: 4096'''		'''; EDNS: version: 0, flags:; udp: 4096'''

-	=== dig +bufsize ===	+	== dig +bufsize ==

-	* According to '''dig'''(1), sending a non-zero '''bufsize''' causes an EDNS query to be sent.
	* If your version of '''dig''' does not support '''+edns=#''', you will have to use '''+bufsize=B'''.		* If your version of '''dig''' does not support '''+edns=#''', you will have to use '''+bufsize=B'''.
		+	* According to '''dig'''(1), sending a non-zero '''bufsize''' causes an EDNS query to be sent.
	$ '''dig @''nameserver'' +noall +comments +bufsize=1 ''query'''''		$ '''dig @''nameserver'' +noall +comments +bufsize=1 ''query'''''
	;; Got answer:		;; Got answer:

Hutch: New page: Use the following to test if a name server supports [http://en.wikipedia.org/wiki/EDNS EDNS], specifically EDNS0 in the examples below. When testing a name server, make sure to send a que...

2008-08-18T20:10:17Z

New page: Use the following to test if a name server supports [http://en.wikipedia.org/wiki/EDNS EDNS], specifically EDNS0 in the examples below. When testing a name server, make sure to send a que...

New page

Use the following to test if a name server supports [http://en.wikipedia.org/wiki/EDNS EDNS], specifically EDNS0 in the examples below.

When testing a name server, make sure to send a query that will result in authoritative answer. For example, if '''ns.example.com''' is authoritative for '''example.com''', send a query such as '''example.com soa'''. Sending a query for something like '''. ns''' to the name server will result in a timeout when specifying '''+edns=0'''.

=== dig +edns ===

* If your version of '''dig''' supports '''+edns=#''', use the following:
$ '''dig @''nameserver'' +noall +comments +edns=0 ''query'''''
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26316
;; flags: qr '''aa''' rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 9, ADDITIONAL: 10

''';; OPT PSEUDOSECTION:'''
'''; EDNS: version: 0, flags:; udp: 4096'''

=== dig +bufsize ===

* According to '''dig'''(1), sending a non-zero '''bufsize''' causes an EDNS query to be sent.
* If your version of '''dig''' does not support '''+edns=#''', you will have to use '''+bufsize=B'''.
$ '''dig @''nameserver'' +noall +comments +bufsize=1 ''query'''''
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61334
;; flags: qr '''aa''' rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 9, ADDITIONAL: 10

''';; OPT PSEUDOSECTION:'''
'''; EDNS: version: 0, flags:; udp: 4096'''