[dns-operations] Strange problem with fragmented DNS responses from b.iana-servers.net

[Peter Dambier]

I have just compared the size returned:


host_name("193.0.0.236","b.iana-servers.net").
;; Query time: 72 msec
;; SERVER: 193.0.0.236#53(193.0.0.236)
;; WHEN: Tue Dec  9 11:31:19 2008
;; MSG SIZE  rcvd: 1483


host_name("192.0.34.43","a.iana-servers.net").
;; Query time: 216 msec
;; SERVER: 192.0.34.43#53(192.0.34.43)
;; WHEN: Tue Dec  9 11:32:27 2008
;; MSG SIZE  rcvd: 1407


The time dig took to return felt more like 2 seconds.
for a.iana-servers.net it returned immediately.

I am living behind a nat router and sDSL

traceroute to 193.0.0.236 (193.0.0.236), 64 hops max, 40 byte packets
 1  yttrium.anul.nsa (7.19.30.39)  1 ms  0 ms  0 ms  <<<local nat>>
 2  * * *
 3  217.0.78.54 (217.0.78.54)  46 ms  44 ms  46 ms
 4  217.239.37.233 (217.239.37.233)  54 ms  55 ms  55 ms
 5  gw.amsix.nikrtr.ripe.net (195.69.144.68)  63 ms  62 ms  64 ms
 6  b.iana-servers.net (193.0.0.236)  57 ms !C  55 ms !C  56 ms !C


traceroute to 192.0.34.43 (192.0.34.43), 64 hops max, 40 byte packets
 1  yttrium.anul.nsa (7.19.30.39)  1 ms  0 ms  0 ms  <<<local nat>>
 2  * * *
 3  217.0.78.54 (217.0.78.54)  45 ms  45 ms  45 ms
 4  nyc-e5.NYC.US.net.DTAG.DE (62.154.5.182)  134 ms  135 ms  135 ms
 5  62.156.128.106 (62.156.128.106)  135 ms  133 ms  135 ms
 6  as-0.r20.asbnva02.us.bb.gin.ntt.net (129.250.2.9)
       [MPLS: Label 398321 Exp 0] More labels  138 ms More labels  143 ms More labels  141 ms
 7  as-2.r21.lsanca03.us.bb.gin.ntt.net (129.250.5.24)
       [MPLS: Label 710352 Exp 0]  203 ms  203 ms  204 ms
 8  po-2.r00.lsanca03.us.bb.gin.ntt.net (129.250.5.250)  355 ms  202 ms  203 ms
 9  ge-1-5.r00.lsanca03.us.ce.gin.ntt.net (198.172.117.162)  200 ms  373 ms  214 ms
10  gr-1-m7i-e-1-3.icann.org (207.151.118.18)  206 ms  206 ms  205 ms
11  cs-2-bi4k-e-1-2.icann.org (192.0.33.237)  203 ms  203 ms  204 ms
12  a.iana-servers.net (192.0.34.43)  202 ms  203 ms  203 ms


Kind regards
Peter


Duane Wessels wrote:
> 
> Here's a successfuly received fragment from b.iana-servers.net.
> 
> 16:35:01.702243 IP (tos 0x0, ttl  48, id 7684, offset 1480, flags
> [none], proto: UDP (17), length: 31) 193.0.0.236 > 12.160.37.4: udp
>         0x0000:  4500 001f 1e04 00b9 3011 7881 c100 00ec
>         0x0010:  0ca0 2504 0000 2910 0000 0000 0000 0000
>         0x0020:  0000 0000 0000 0000 0000 0000 0000
> 
> So it seems that the packet includes extra data.  The IP length
> should be 31, but is actually 46 octets....
> 
> DW
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> dns-operations at lists.dns-oarc.net
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Peter and Karin Dambier
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