Re: [midcom] MIDCOM-MIB: Timeout for unused midcomRuleEntries

[Martin Stiemerling <stiemerling at netlab.nec.de>]

Dear MIDCOM-ers,

As described below, entries in midcomRuleTable (representing the policy 
rules) are generated out of the use of midcomSessionTable.

A malicious MIDCOM client could start generating more and more entries in 
midcomRuleTable until the resources at the middlebox are exhausted. One way 
to prevent MIDCOM clients of doing so, is to associate to each entry in 
midcomRuleTable an initial timeout value. So the entry will be removed 
automatically if it is not used after timeout expiration (not used is equal 
to not writing to midcomRuleAdminStatus.)

This timeout value is currently set to 60 seconds in the MIDCOM MIB module 
definition.

As long as nobody has any objection to this timeout value, it is regarded 
as accepted.

 Martin

--On Dienstag, 15. Juni 2004 22:56 Uhr +0200 Martin Stiemerling 
<stiemerling at netlab.nec.de> wrote:

| - Request unused entries in rule table to be written to
|   object midcomRuleAdminStatus within 60 seconds.
|   Timeout for unused rule entries is aborted only by writing to
|   midcomRuleAdminStatus
|
| Freshly generated entries in midcomRuleTable are removed after 60 seconds
| if midcomRuleAdminStatus is not written.
|
| There is already text in midcomSessionRuleNewIndex about this.  The
| remaining question is whether the timeout value is appropriate of not.
|
|
| _______________________________________________
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| midcom at ietf.org
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