Re: help with FC3 and Bugzilla Bug 161181 DNS truncation

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Skunk Worx wrote:
Paul Howarth wrote:

On Mon, 2005-08-22 at 12:58 -0700, Skunk Worx wrote:

Paul Howarth wrote:

On Sun, 2005-08-21 at 16:54 -0700, Skunk Worx wrote:


My FC3 local caching DNS is placing the AUTHORITY section in the responses. I think this exceeds a certain size threshold and I get this :

# dig @10.0.0.2 www.wikipedia.org
;; Truncated, retrying in TCP mode.

When I go directly to my ISP's dns, it is fine, I assume because there is no lengthy AUTHORITY section in their reply.



What lengthy AUTHORITY section? I'm getting just this:

;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 3, ADDITIONAL: 3


So far I always get back AUTHORITY: 13 from my local caching DNS with lines in the form of :

.                       28240   IN      NS      A.ROOT-SERVERS.NET.

If I make an empty root.hints file I get SERVFAIL. If I try trimming down the root.hints file, or removing it, I get all 13 entries back.

Dig'ing directly to my ISPs DNS returns AUTHORITY: 0 (no list), so the size of the response is not big enough to trigger the glibc bug.

I've been fooling with the root.hints, zone and conf files and reviewing the caching DNS howto's (via google) but so far it's all or nothing (13 AUTHORITY: entries or SERVFAIL).



What's strange about this is that the AUTHORITY section should be
returning the 3 wikipedia.org nameservers, not the root servers.

What do you get for:
$ dig www.wikipedia.org +trace
$ rpm -q bind


Thanks again for your continuing help. I must have some configuration setting botched to be getting all those root server entries.

--
SW

$ dig www.wikipedia.org +trace

; <<>> DiG 9.2.5 <<>> www.wikipedia.org +trace
;; global options:  printcmd
.                       38309   IN      NS      D.ROOT-SERVERS.NET.
.                       38309   IN      NS      E.ROOT-SERVERS.NET.
.                       38309   IN      NS      F.ROOT-SERVERS.NET.
.                       38309   IN      NS      G.ROOT-SERVERS.NET.
.                       38309   IN      NS      H.ROOT-SERVERS.NET.
.                       38309   IN      NS      I.ROOT-SERVERS.NET.
.                       38309   IN      NS      J.ROOT-SERVERS.NET.
.                       38309   IN      NS      K.ROOT-SERVERS.NET.
.                       38309   IN      NS      L.ROOT-SERVERS.NET.
.                       38309   IN      NS      M.ROOT-SERVERS.NET.
.                       38309   IN      NS      A.ROOT-SERVERS.NET.
.                       38309   IN      NS      B.ROOT-SERVERS.NET.
.                       38309   IN      NS      C.ROOT-SERVERS.NET.
;; Received 260 bytes from 10.0.0.2#53(10.0.0.2) in 3 ms

org.                    172800  IN      NS      TLD1.ULTRADNS.NET.
org.                    172800  IN      NS      TLD2.ULTRADNS.NET.
org.                    172800  IN      NS      TLD3.ULTRADNS.org.
org.                    172800  IN      NS      TLD4.ULTRADNS.org.
org.                    172800  IN      NS      TLD5.ULTRADNS.INFO.
org.                    172800  IN      NS      TLD6.ULTRADNS.CO.UK.
;; Received 293 bytes from 128.8.10.90#53(D.ROOT-SERVERS.NET) in 103 ms

wikipedia.org.          86400   IN      NS      ns2.wikimedia.org.
wikipedia.org.          86400   IN      NS      ns1.wikimedia.org.
wikipedia.org.          86400   IN      NS      ns0.wikimedia.org.
;; Received 147 bytes from 204.74.112.1#53(TLD1.ULTRADNS.NET) in 20 ms

www.wikipedia.org.      3600    IN      CNAME   rr.wikimedia.org.
rr.wikimedia.org.       600     IN      CNAME   rr.pmtpa.wikimedia.org.
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.248
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.204
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.210
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.246
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.235
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.213
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.245
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.203
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.206
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.214
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.247
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.236
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.202
rr.pmtpa.wikimedia.org. 3600    IN      A       207.142.131.205
;; Received 309 bytes from 145.97.39.158#53(ns2.wikimedia.org) in 168 ms

So that looks OK then.

Is your named configured to resolve things itself, or forward requests to your ISP's server? Whatever it is, trying the other option might work around the issue for the time being.

Paul.


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