dig info

[Mark Andrews]

In message <980168.77226.qm at web15605.mail.cnb.yahoo.com>, "Tech W." writes:
> 
> Sometime I dig a domain name, it returns the results below:
> 
> ;; reply from unexpected source: 59.42.52.246#59721, expected 211.66.80.167#5
> 3
> ;; reply from unexpected source: 59.42.52.246#59721, expected 211.66.80.167#5
> 3
> ;; reply from unexpected source: 59.42.52.246#59721, expected 211.66.80.167#5
> 3
> ;; connection timed out; no servers could be reached

	Is this a linux box dig is running on?  Some linux kernels
	have the worst possible UDP port selection algorithms.  They
	keep selecting the port that was last selected provided it
	is closed before you get the next port selection request.
	On a box with several short lived UDP sockets you will
	almost certainly get reply traffic destined to the last
	user of the port.

	This is what is happening here, dig seeing replies to
	whatever was using the port immediately before dig was run.
	
 
> but sometime it returns the correct results.
> 
> what happened to this domain's name server (AFAIK it's using bind-9.6).
> Thanks.
> 
> 
> 
>       Need a Holiday? Win a $10,000 Holiday of your choice. Enter now.http://
> us.lrd.yahoo.com/_ylc=X3oDMTJxN2x2ZmNpBF9zAzIwMjM2MTY2MTMEdG1fZG1lY2gDVGV4dCB
> MaW5rBHRtX2xuawNVMTEwMzk3NwR0bV9uZXQDWWFob28hBHRtX3BvcwN0YWdsaW5lBHRtX3BwdHkD
> YXVueg--/SIG=14600t3ni/**http%3A//au.rd.yahoo.com/mail/tagline/creativeholida
> ys/*http%3A//au.docs.yahoo.com/homepageset/%3Fp1=other%26p2=au%26p3=mailtagli
> ne
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org