dns clients using non-ephemeral ports

Derek J. Balling dredd at megacity.org
Wed Jan 10 21:09:15 UTC 2001


Remember that, as far as I know, windows boxes make no distinction between
(>1024) and ( <= 1024).

D

At 1:01 PM -0800 1/10/01, ed at alcpress.com wrote:
>My firewall is configured to allow dns requests from the outside
>world that use ephemeral source ports (1024-65535) and port 53.
>When I check my logs, I see packets that were rejected
>because they used source ports below 1024. Here
>are some examples:
>
>195.153.131.2:665
>203.229.169.225:744
>212.62.4.189:904
>
>Are there resolvers or servers out there that normally do this or have
>I turned away a potential attack?
>
>Ed

-- 
+---------------------+-----------------------------------------+
| dredd at megacity.org  | "Conan! What is best in life?"          |
|  Derek J. Balling   | "To crush your enemies, see them        |
|                     |    driven before you, and to hear the   |
|                     |    lamentation of their women!"         |
+---------------------+-----------------------------------------+



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