os2-wireless_users@2rosenthals.com ?????????????? ????? #669

???: "Lewis G Rosenthal" <os2-wireless_users@2rosenthals.com> ?? ????
?????????
??: Re: [OS2Wireless]Re: OT: DNS Lookup tracing (was: Re: [OS2Wireless]Re: Any idea why there are so many sessions to port53? -crossposted)
??: Fri, 09 Feb 2007 20:21:10 -0500
??: OS/2 Wireless Users Mailing List <os2-wireless_users@2rosenthals.com>

"Processing mail..." meaning...what?

What do NAT sessions have to do with DNS requests? The fact is that you are behind a NAT firewall. All that is being said is that your machine is traversing a NAT to get to a DNS box and make a request. For a mail server, this is a regular thing. the only way I avoid all the internet traffic is that my NetWare server is running DNS, forwarding, and caching. So, the first time Hawking2 (my  OS/2 mail server) looks for an address (or a reverse DNS lookup), it sends that request to Galileo (NetWare). Galileo looks to see if he has cached the info, and if not, makes the request upstream to one of the root servers, caches a copy, and sends the data back to Hawking2. The next time, the response is faster, as Galileo doesn't need to go beyond his own cache. Hawking2, however, will once again make the request, as he is not running any kind of DNS cache locally.

Here's a snippet for Hawking2's DNS traffic (note the time of each request):

20:17:09.440 5 DNR-024259(mail.queensbotanical.org) A-request
20:17:09.440 4 DNR-024259(mail.queensbotanical.org) A-request -> udp:[192.168.100.1]:53
20:17:09.440 5 DNR-024259(mail.queensbotanical.org) got 294 bytes from [192.168.100.1]:53: 5E C3 81 80 00 01 00 02 00 05 00 05 04 6D 61 69 6C 0F 71 75 65 65 6E 73 62 6F 74 61 6E 69 63 61 6C 03 6F 72 67 00 00 01 00 01 C0 0C 00 05 00 01 00 00 17 85 00 1A 04 71 62 67 31 0F 71 75 65 65 6E 73 62 6F 74
20:17:09.440 5 DNR-024259(mail.queensbotanical.org) A:OK
20:17:09.440 4 DNR-024259(mail.queensbotanical.org) A[1]: qbg1.queensbotanical.org=[64.105.127.170]
20:17:11.010 5 DNR-024260(146.248.9.216.IN-ADDR.ARPA) PTR-request
20:17:11.020 4 DNR-024260(146.248.9.216.IN-ADDR.ARPA) PTR-request -> udp:[192.168.100.1]:53
20:17:11.410 5 DNR-024260(146.248.9.216.IN-ADDR.ARPA) got 86 bytes from [192.168.100.1]:53: 5E C4 81 80 00 01 00 01 00 00 00 00 03 31 34 36 03 32 34 38 01 39 03 32 31 36 07 69 6E 2D 61 64 64 72 04 61 72 70 61 00 00 0C 00 01 C0 0C 00 0C 00 01 00 00 02 58 00 1E 06 62 64 61 32 32 36 03 62 69 73 02 6E
20:17:11.410 5 DNR-024260(146.248.9.216.IN-ADDR.ARPA) PTR:OK
20:17:11.410 4 DNR-024260(146.248.9.216.IN-ADDR.ARPA) PTR[0]: 146.248.9.216.in-addr.arpa -> bda226.bis.na.blackberry.com
20:17:27.400 5 DNR-024261(incoming.verizon.net) A-request
20:17:27.400 4 DNR-024261(incoming.verizon.net) A-request -> udp:[192.168.100.1]:53
20:17:27.400 5 DNR-024261(incoming.verizon.net) got 501 bytes from [192.168.100.1]:53: 5E C5 81 80 00 01 00 01 00 0D 00 0D 08 69 6E 63 6F 6D 69 6E 67 07 76 65 72 69 7A 6F 6E 03 6E 65 74 00 00 01 00 01 C0 0C 00 01 00 01 00 00 72 75 00 04 CE 2E E8 0A 03 4E 45 54 00 00 02 00 01 00 00 DB 6C 00 14 01 4C
20:17:27.400 5 DNR-024261(incoming.verizon.net) A:OK
20:17:27.400 4 DNR-024261(incoming.verizon.net) A[0]: incoming.verizon.net=[206.46.232.10]
20:17:28.400 5 DNR-024262(incoming.verizon.net) A-request
20:17:28.400 4 DNR-024262(incoming.verizon.net) A-request -> udp:[192.168.100.1]:53
20:17:28.400 5 DNR-024262(incoming.verizon.net) got 501 bytes from [192.168.100.1]:53: 5E C6 81 80 00 01 00 01 00 0D 00 0D 08 69 6E 63 6F 6D 69 6E 67 07 76 65 72 69 7A 6F 6E 03 6E 65 74 00 00 01 00 01 C0 0C 00 01 00 01 00 00 72 74 00 04 CE 2E E8 0A 03 4E 45 54 00 00 02 00 01 00 00 DB 6B 00 14 01 4C
20:17:28.400 5 DNR-024262(incoming.verizon.net) A:OK
20:17:28.400 4 DNR-024262(incoming.verizon.net) A[0]: incoming.verizon.net=[206.46.232.10]
20:17:32.710 5 DNR-024263(135.249.9.216.IN-ADDR.ARPA) PTR-request
20:17:32.710 4 DNR-024263(135.249.9.216.IN-ADDR.ARPA) PTR-request -> udp:[192.168.100.1]:53
20:17:33.050 5 DNR-024263(135.249.9.216.IN-ADDR.ARPA) got 86 bytes from [192.168.100.1]:53: 5E C7 81 80 00 01 00 01 00 00 00 00 03 31 33 35 03 32 34 39 01 39 03 32 31 36 07 69 6E 2D 61 64 64 72 04 61 72 70 61 00 00 0C 00 01 C0 0C 00 0C 00 01 00 00 02 58 00 1E 06 62 64 61 31 33 35 03 62 69 73 02 6E
20:17:33.050 5 DNR-024263(135.249.9.216.IN-ADDR.ARPA) PTR:OK
20:17:33.050 4 DNR-024263(135.249.9.216.IN-ADDR.ARPA) PTR[0]: 135.249.9.216.in-addr.arpa -> bda135.bis.na.blackberry.com
20:17:33.500 5 DNR-024264(168.196.208.63.IN-ADDR.ARPA) PTR-request
20:17:33.500 4 DNR-024264(168.196.208.63.IN-ADDR.ARPA) PTR-request -> udp:[192.168.100.1]:53
20:17:33.500 5 DNR-024264(168.196.208.63.IN-ADDR.ARPA) got 497 bytes from [192.168.100.1]:53: 5E C8 81 80 00 01 00 01 00 0C 00 0D 03 31 36 38 03 31 39 36 03 32 30 38 02 36 33 07 49 4E 2D 41 44 44 52 04 41 52 50 41 00 00 0C 00 01 C0 0C 00 0C 00 01 00 00 75 2A 00 14 06 6D 78 6F 75 74 34 07 6D 61 69
20:17:33.500 5 DNR-024264(168.196.208.63.IN-ADDR.ARPA) PTR:OK
20:17:33.500 4 DNR-024264(168.196.208.63.IN-ADDR.ARPA) PTR[0]: 168.196.208.63.IN-ADDR.ARPA -> mxout4.mailhop.org
20:17:33.500 5 DNR-024265(168.196.208.63.xbl.spamhaus.org) A-request
20:17:33.500 4 DNR-024265(168.196.208.63.xbl.spamhaus.org) A-request -> udp:[192.168.100.1]:53
20:17:33.500 5 DNR-024265(168.196.208.63.xbl.spamhaus.org) got 129 bytes from [192.168.100.1]:53: 5E C9 85 83 00 01 00 00 00 01 00 00 03 31 36 38 03 31 39 36 03 32 30 38 02 36 33 03 78 62 6C 08 73 70 61 6D 68 61 75 73 03 6F 72 67 00 00 01 00 01 03 78 62 6C 08 73 70 61 6D 68 61 75 73 03 6F 72 67 00
20:17:33.500 4 DNR-024265(168.196.208.63.xbl.spamhaus.org) A:host name is unknown
20:17:33.500 5 DNR-024266(168.196.208.63.sbl.spamhaus.org) A-request
20:17:33.500 4 DNR-024266(168.196.208.63.sbl.spamhaus.org) A-request -> udp:[192.168.100.1]:53
20:17:33.500 5 DNR-024266(168.196.208.63.sbl.spamhaus.org) got 129 bytes from [192.168.100.1]:53: 5E CA 85 83 00 01 00 00 00 01 00 00 03 31 36 38 03 31 39 36 03 32 30 38 02 36 33 03 73 62 6C 08 73 70 61 6D 68 61 75 73 03 6F 72 67 00 00 01 00 01 03 73 62 6C 08 73 70 61 6D 68 61 75 73 03 6F 72 67 00
20:17:33.500 4 DNR-024266(168.196.208.63.sbl.spamhaus.org) A:host name is unknown
20:17:33.540 5 DNR-024267(mxout4.mailhop.org) A-request
20:17:33.540 4 DNR-024267(mxout4.mailhop.org) A-request -> udp:[192.168.100.1]:53
20:17:33.540 5 DNR-024267(mxout4.mailhop.org) got 372 bytes from [192.168.100.1]:53: 5E CB 81 80 00 01 00 01 00 06 00 08 06 6D 78 6F 75 74 34 07 6D 61 69 6C 68 6F 70 03 6F 72 67 00 00 01 00 01 C0 0C 00 01 00 01 00 00 6E 66 00 04 3F D0 C4 A8 03 4F 52 47 00 00 02 00 01 00 00 89 C4 00 13 04 54 4C 44
20:17:33.540 5 DNR-024267(mxout4.mailhop.org) A:OK
20:17:33.540 4 DNR-024267(mxout4.mailhop.org) A[0]: mxout4.mailhop.org=[63.208.196.168]
20:17:33.570 5 DNR-024268(mtu-net.ru) MX-request
20:17:33.570 4 DNR-024268(mtu-net.ru) MX-request -> udp:[192.168.100.1]:53
20:17:33.620 5 DNR-024268(mtu-net.ru) got 52 bytes from [192.168.100.1]:53: 5E CC 81 80 00 01 00 01 00 00 00 00 07 6D 74 75 2D 6E 65 74 02 72 75 00 00 0F 00 01 C0 0C 00 0F 00 01 00 00 00 82 00 0C 00 0A 03 6D 78 30 03 6D 74 75 C0 14
20:17:33.620 5 DNR-024268(mtu-net.ru) MX:OK
20:17:33.620 4 DNR-024268(mtu-net.ru) MX[0]: mtu-net.ru(pty 10) = mx0.mtu.ru
20:17:33.620 5 DNR-024269(mx0.mtu.ru) A-request
20:17:33.620 4 DNR-024269(mx0.mtu.ru) A-request -> udp:[192.168.100.1]:53
20:17:33.650 5 DNR-024269(mx0.mtu.ru) got 44 bytes from [192.168.100.1]:53: 5E CD 81 80 00 01 00 01 00 00 00 00 03 6D 78 30 03 6D 74 75 02 72 75 00 00 01 00 01 C0 0C 00 01 00 01 00 00 00 9B 00 04 C3 22 20 FE
20:17:33.650 5 DNR-024269(mx0.mtu.ru) A:OK
20:17:33.650 4 DNR-024269(mx0.mtu.ru) A[0]: mx0.mtu.ru=[195.34.32.254]
20:17:33.760 5 DNR-024270(127.219.168.68.IN-ADDR.ARPA) PTR-request
20:17:33.760 4 DNR-024270(127.219.168.68.IN-ADDR.ARPA) PTR-request -> udp:[192.168.100.1]:53
20:17:33.760 5 DNR-024270(127.219.168.68.IN-ADDR.ARPA) got 371 bytes from [192.168.100.1]:53: 5E CE 81 80 00 01 00 01 00 07 00 07 03 31 32 37 03 32 31 39 03 31 36 38 02 36 38 07 49 4E 2D 41 44 44 52 04 41 52 50 41 00 00 0C 00 01 C0 0C 00 0C 00 01 00 00 8B A5 00 24 0E 36 38 2D 31 36 38 2D 32 31 39
20:17:33.760 5 DNR-024270(127.219.168.68.IN-ADDR.ARPA) PTR:OK
20:17:33.760 4 DNR-024270(127.219.168.68.IN-ADDR.ARPA) PTR[0]: 127.219.168.68.IN-ADDR.ARPA -> 68-168-219-127.atlsfl.adelphia.net
20:17:34.430 5 DNR-024271(168.196.208.63.IN-ADDR.ARPA) PTR-request
20:17:34.430 4 DNR-024271(168.196.208.63.IN-ADDR.ARPA) PTR-request -> udp:[192.168.100.1]:53
20:17:34.430 5 DNR-024271(168.196.208.63.IN-ADDR.ARPA) got 497 bytes from [192.168.100.1]:53: 5E CF 81 80 00 01 00 01 00 0C 00 0D 03 31 36 38 03 31 39 36 03 32 30 38 02 36 33 07 49 4E 2D 41 44 44 52 04 41 52 50 41 00 00 0C 00 01 C0 0C 00 0C 00 01 00 00 75 29 00 14 06 6D 78 6F 75 74 34 07 6D 61 69
20:17:34.430 5 DNR-024271(168.196.208.63.IN-ADDR.ARPA) PTR:OK
20:17:34.430 4 DNR-024271(168.196.208.63.IN-ADDR.ARPA) PTR[0]: 168.196.208.63.IN-ADDR.ARPA -> mxout4.mailhop.org
20:17:34.430 5 DNR-024272(168.196.208.63.xbl.spamhaus.org) A-request
20:17:34.430 4 DNR-024272(168.196.208.63.xbl.spamhaus.org) A-request -> udp:[192.168.100.1]:53
20:17:34.430 5 DNR-024272(168.196.208.63.xbl.spamhaus.org) got 129 bytes from [192.168.100.1]:53: 5E D0 85 83 00 01 00 00 00 01 00 00 03 31 36 38 03 31 39 36 03 32 30 38 02 36 33 03 78 62 6C 08 73 70 61 6D 68 61 75 73 03 6F 72 67 00 00 01 00 01 03 78 62 6C 08 73 70 61 6D 68 61 75 73 03 6F 72 67 00
20:17:34.430 4 DNR-024272(168.196.208.63.xbl.spamhaus.org) A:host name is unknown
20:17:34.430 5 DNR-024273(168.196.208.63.sbl.spamhaus.org) A-request
20:17:34.430 4 DNR-024273(168.196.208.63.sbl.spamhaus.org) A-request -> udp:[192.168.100.1]:53
20:17:34.430 5 DNR-024273(168.196.208.63.sbl.spamhaus.org) got 129 bytes from [192.168.100.1]:53: 5E D1 85 83 00 01 00 00 00 01 00 00 03 31 36 38 03 31 39 36 03 32 30 38 02 36 33 03 73 62 6C 08 73 70 61 6D 68 61 75 73 03 6F 72 67 00 00 01 00 01 03 73 62 6C 08 73 70 61 6D 68 61 75 73 03 6F 72 67 00
20:17:34.430 4 DNR-024273(168.196.208.63.sbl.spamhaus.org) A:host name is unknown
20:17:34.510 5 DNR-024274(mxout4.mailhop.org) A-request
20:17:34.510 4 DNR-024274(mxout4.mailhop.org) A-request -> udp:[192.168.100.1]:53
20:17:34.510 5 DNR-024274(mxout4.mailhop.org) got 372 bytes from [192.168.100.1]:53: 5E D2 81 80 00 01 00 01 00 06 00 08 06 6D 78 6F 75 74 34 07 6D 61 69 6C 68 6F 70 03 6F 72 67 00 00 01 00 01 C0 0C 00 01 00 01 00 00 6E 65 00 04 3F D0 C4 A8 03 4F 52 47 00 00 02 00 01 00 00 89 C3 00 13 04 54 4C 44
20:17:34.510 5 DNR-024274(mxout4.mailhop.org) A:OK
20:17:34.510 4 DNR-024274(mxout4.mailhop.org) A[0]: mxout4.mailhop.org=[63.208.196.168]
20:17:34.550 5 DNR-024275(mtu-net.ru) MX-request
20:17:34.550 4 DNR-024275(mtu-net.ru) MX-request -> udp:[192.168.100.1]:53
20:17:34.550 5 DNR-024275(mtu-net.ru) got 505 bytes from [192.168.100.1]:53: 5E D3 81 80 00 01 00 01 00 0D 00 0F 07 6D 74 75 2D 6E 65 74 02 72 75 00 00 0F 00 01 C0 0C 00 0F 00 01 00 00 00 81 00 0E 00 0A 03 6D 78 30 03 6D 74 75 02 72 75 00 00 00 02 00 01 00 32 CD 0B 00 14 01 4D 0C 52 4F 4F 54 2D 53
20:17:34.550 5 DNR-024275(mtu-net.ru) MX:OK
20:17:34.550 4 DNR-024275(mtu-net.ru) MX[0]: mtu-net.ru(pty 10) = mx0.mtu.ru
20:17:34.550 4 DNR-024275(mtu-net.ru) suppl[0]: mx0.mtu.ru=[195.34.32.254]

The spamhaus.org lookups are (obviously) for DNSBL lookups (host name is unknown indicates that the host is *not* on a blocklist).

Anyway, this was a relatively quiet couple of minutes.

DNS is a busy service!

On 02/09/07 05:53 pm, Leon D. Zetekoff thus wrote :
* Lewis G Rosenthal wrote, On 2/9/2007 5:43 PM:
If you're browsing or checking or sending email, UDP 53 will be in constant use (unless you have such a huge hosts file that lookups are unnecessary). You really need to debug the DNS requests to determine what it's trying to find, and that should give you some clue as to what's asking.
Hi Lewis...but this is from my OS?2 machine which all it is doing is processing mail every five minutes. All those NAT sessions seem way too many for what should be going on....

Leon

IPTRACE won't give you enough detail. You'll need something which will list the UDP packets on port 53 and their contents in order to determine  what is being requested.

On 02/09/07 12:34 pm, Leon D. Zetekoff thus wrote :
yes the 192...100 is the os2 box on my internal network. It is NATed by the router. Yes port 53 is DNS but OS2 for some reason is chatting away. Guess I'll get a task list and see what's in there. The 199.224 address is one of the DNS servers of my provider.

Thanks leon

* Sam Lewis wrote, On 2/9/2007 12:25 PM:
It's probably the port NAT is using to forward packets.  Here is a link to an explanation of how NAT works.  It may explain this better.

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094831.shtml#flash Sam

Leon D. Zetekoff wrote:

Sorry for the crosspost but trying to get an answer...thanks leon

====================

It seems my os/2 box likes to talk out to port 53. Check out this from
my router:

Page 40/40
Internal     Prot.     External     NAT     Time-out
192.168.0.100:54692     UDP     199.224.86.16:53     65159     153
192.168.0.100:54713     UDP     199.224.86.16:53     65191     159
192.168.0.100:54800     UDP     199.224.86.16:53     65215     195
192.168.0.100:54779     UDP     199.224.86.16:53     65239     186
192.168.0.100:54562     UDP     199.224.86.16:53     65261     103
192.168.0.100:54477     UDP     199.224.86.16:53     65263     63
192.168.0.100:54967     UDP     199.224.86.16:53     65271     266
192.168.0.100:54387     UDP     199.224.86.16:53     65299     39
192.168.0.100:54758     UDP     199.224.86.16:53     65331     177
192.168.0.100:54336     UDP     199.224.86.16:53     65335     14
192.168.0.102:1803     UDP     199.224.86.20:53     65357     214
192.168.0.100:54527     UDP     199.224.86.16:53     65361     86
192.168.0.100:54509     UDP     199.224.86.16:53     65405     80
192.168.0.100:54383     UDP     199.224.86.16:53     65409     39
192.168.0.100:54649     UDP     199.224.86.16:53     65423     141
192.168.0.100:55015     UDP     199.224.86.16:53     65431     274
192.168.0.100:54877     UDP     199.224.86.16:53     65433     229
192.168.0.100:54732     UDP     199.224.86.16:53     65437     167
192.168.0.100:54898     UDP     199.224.86.16:53     65453     239


192.168.0.100 is the os2 box any idea why it chatters so much?

Thanks leon


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