Thanks for filing the bug, I'll look into it. However, before that, I really need to know a few more details:
- on which platform(s) do you see this bug ? (exact details, including version/patch numbers please) - is the problem appearing in all applications that access the network, or only some of them. If the latter, can you list the ones you spotted ? - if this is in a custom application, can you tell exactly which API you're using to resove the host name. thanks in advance On Mon, May 25, 2009 at 9:31 PM, Peter Jeffe <pje...@gmail.com> wrote: > > I'm glad to hear someone else is seeing this. I've submitted this as > a bug (http://code.google.com/p/android/issues/detail?id=2764). It > would really help if anyone who has 1.5 on a device could say whether > they've seen this sort of behavior--either getting unknown host errors > (check the log for InetAddress errors like below), or taking a really > long time to open a web page etc. > > The bug report reads as follows: > > -- > Running the 1.5 SDK on Windows XP SP2, the DNS client on the emulator > periodically seems to get confused and do the following: > > 1. Re-transmit a valid query 4 times, with 5-second delays between > each query, even though it receives a valid response each time. > > 2. Then append garbage to the domain name being queried and query this > for 4 times, of course receiving an NXDOMAIN response each time. > > It appears that it then always throws an UnknownHostException, which > shows up in the log as: > > 05-25 18:45:04.568 4833 4848 I InetAddress: Unknown host www.google.com, > throwing UnknownHostException > 05-25 18:45:45.448 4833 4851 I InetAddress: Unknown host > csi.gstatic.com, throwing UnknownHostException > > It seems to start doing this some time after the emulator is started, > but there's no regular pattern that I can see. This has also been > observed by at least one other developer (see > > http://groups.google.com/group/android-developers/browse_thread/thread/cd5be36a07ad1a3d/ba559f2e2ff06e32#ba559f2e2ff06e32 > ). > > I took a network trace with Wireshark of the DNS traffic while opening > www.google.com in the browser and have attached both the text and > binary dumps of it. Here's an excerpt: > > 57 13:45:20.080441 192.168.0.108 24.93.41.127 > DNS Standard query A csi.gstatic.com > 58 13:45:20.150069 24.93.41.127 192.168.0.108 > DNS Standard query response CNAME csi.l.google.com A > 209.85.165.101 A 209.85.165.102 A 209.85.165.113 A 209.85.165.100 > 59 13:45:25.082077 192.168.0.108 24.93.41.128 > DNS Standard query A csi.gstatic.com > 60 13:45:25.104063 24.93.41.128 192.168.0.108 > DNS Standard query response CNAME csi.l.google.com A > 209.85.165.100 A 209.85.165.101 A 209.85.165.102 A 209.85.165.113 > 61 13:45:30.077230 192.168.0.108 24.93.41.127 > DNS Standard query A csi.gstatic.com > 62 13:45:30.098362 24.93.41.127 192.168.0.108 > DNS Standard query response CNAME csi.l.google.com A > 209.85.165.113 A 209.85.165.100 A 209.85.165.101 A 209.85.165.102 > 63 13:45:35.077796 192.168.0.108 24.93.41.128 > DNS Standard query A csi.gstatic.com > 64 13:45:35.101998 24.93.41.128 192.168.0.108 > DNS Standard query response CNAME csi.l.google.com A > 209.85.165.101 A 209.85.165.102 A 209.85.165.113 A 209.85.165.100 > 65 13:45:40.082501 192.168.0.108 24.93.41.127 > DNS Standard query A csi.gstatic.com.\360\v > 66 13:45:40.259945 24.93.41.127 192.168.0.108 > DNS Standard query response, No such name > 67 13:45:45.081006 192.168.0.108 24.93.41.128 > DNS Standard query A csi.gstatic.com.\360\v > 68 13:45:45.165518 24.93.41.128 192.168.0.108 > DNS Standard query response, No such name > 69 13:45:50.076779 192.168.0.108 24.93.41.127 > DNS Standard query A csi.gstatic.com.\360\v > 70 13:45:50.143289 24.93.41.127 192.168.0.108 > DNS Standard query response, No such name > 71 13:45:55.078268 192.168.0.108 24.93.41.128 > DNS Standard query A csi.gstatic.com.\360\v > 72 13:45:55.103427 24.93.41.128 192.168.0.108 > DNS Standard query response, No such name > > Note that it keeps retrying every 5 seconds, even when it got a valid > response. Then see after 4 queries with the correct domain name it > starts appending garbage to the domain name (csi.gstatic.com.\360\v). > And this is definitely what's in the packet, the dump looks like this > (see the 02, f0, 0b starting at offset 46): > > 0000 00 1b 24 72 bc 38 00 1d 7e f0 a0 53 08 00 45 00 ..$r.8.. > ~..S..E. > 0010 00 8b d1 13 40 00 f7 11 af 5c 18 5d 29 80 c0 a8 ....@... . > \.])... > 0020 00 6c 00 35 c1 23 00 77 f0 29 2b 01 85 83 00 01 .l.5.#.w .) > +..... > 0030 00 00 00 01 00 00 03 63 73 69 07 67 73 74 61 74 .......c > si.gstat > 0040 69 63 03 63 6f 6d 02 f0 0b 00 00 01 00 01 00 00 > ic.com.. ........ > 0050 06 00 01 00 00 2a 26 00 40 01 61 0c 72 6f 6f 74 .....*&. > @.a.root > 0060 2d 73 65 72 76 65 72 73 03 6e 65 74 00 05 6e 73 - > servers .net..ns > 0070 74 6c 64 0c 76 65 72 69 73 69 67 6e 2d 67 72 73 tld.veri sign- > grs > 0080 03 63 6f 6d 00 77 bf b5 54 00 00 07 08 00 00 03 .com.w.. > T....... > 0090 84 00 09 3a 80 00 01 51 > 80 ...:...Q . > > As annoying as this is on the emulator, my main concern of course is > that it's also a problem on the device, which would be a disaster. > > -- Peter > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. 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