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Some unusual network features
From: Paul Johnston <paul () westpoint ltd uk>
Date: Tue, 13 Jan 2004 09:46:08 +0000


I've come accross the following anomoloies while auditing a network, can anyone help explain what they are:

1) Ports that "hang open" i.e. you can connect, send data ok, but the other end never sends any data and never closes the connection. 2) HTTP ports that function normally when you issue some methods, but on other methods (including the imaginary method "SILLY") cause the connection to "hang open" like in (1). 3) Ports where the TTL is different on the SYN reply to the rest of the connection. ipid's also imply that different hosts are handling the SYN and the rest of the connection.

I've got some theories, but I'm not sure how much I'm jumping to conclusions.


Paul Johnston
Internet Security Specialist
Westpoint Limited
Albion Wharf, 19 Albion Street,
Manchester, M1 5LN
Tel: +44 (0)161 237 1028
Fax: +44 (0)161 237 1031
email: paul () westpoint ltd uk
web: www.westpoint.ltd.uk


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