Mailing List os2-wireless_users@2rosenthals.com Archived Message #667

From:	"Leon D. Zetekoff" <os2-wireless_users@2rosenthals.com>	Full Headers Undecoded message
Subject:	Re: [OS2Wireless]OT: DNS Lookup tracing (was: Re: [OS2Wireless]Re: Any idea why there are so many sessions to port53? -crossposted)
Date:	Fri, 09 Feb 2007 17:53:54 -0500
To:	OS/2 Wireless Users Mailing List <os2-wireless_users@2rosenthals.com>

* 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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