Unknown udp connections with D flag

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Sep 6th, 2007
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I have noticed since this morning in my PIX 515E a lot of unknown udp connections with D flag (750 - 800 connections). These connections are from my ISA global IP Address to three global IP Addresses, & All of these connections have source port 3188. does anyone know any relevant issue?


Thanks in advance

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a.alekseev Fri, 09/07/2007 - 00:14
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  • Gold, 750 points or more, & - DNS servers.

jgtheodor Fri, 09/07/2007 - 00:37
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The number of the relevant connections get raised continuously. This is the first time since 3 years that i have too many connections like these to DNS Servers. In addition i have configured the ISA's network properties with another DNS IP Addresses. And of course i believe that it is not uncommon all of these connections start with the same source udp port. And something more: why the replies of these dns connections have source port other from udp 53?

Is there any way to control these connections from PIX?

Thanks in advance...


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