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MQSeries.net Forum Index » IBM MQ Installation/Configuration Support » MAXMSGL Default setting - security implications

MAXMSGL Default setting - security implications

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whatupboo

Posted: Tue Nov 28, 2006 9:17 pm Post subject: MAXMSGL Default setting - security implications

Newbie

Joined: 28 Nov 2006
Posts: 2
Location: LA

I am currently working on an MQ series implementation which will be used for passing messages of around 1-2Kb.

Could anyone please tell me the security implications of leaving the default maximum message length of 4Mb? What is the rule of thumb for the size I should set the MAXMSGL?

Many thanks for the help!

Vitor

Posted: Wed Nov 29, 2006 12:35 am Post subject: Re: MAXMSGL Default setting - security implications

Grand High Poobah

Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA

whatupboo wrote:

Could anyone please tell me the security implications of leaving the default maximum message length of 4Mb?

The security of the queue manager is down to how well the access paths are protected rather than the message size!!

Do you mean security as is stability? The impact of message size here is on logging, where you need to account for message size & number of uncommitted transactions. IIRC the System Admin manual has a formula you can use to calculate it?

whatupboo wrote:

What is the rule of thumb for the size I should set the MAXMSGL?

IMHO I wouldn't bother to change it until you start sending messages larger than 4Mb, but concentrate instead on the logging. It needs to be large enough to take your biggest message plus all the headers MQ can add. I think the manual talks about this as well.
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jefflowrey

Posted: Wed Nov 29, 2006 2:38 am Post subject:

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981

The rule of thumb is that either you leave it alone or you set it to the max (104857600).

That way you only ever have to make the change once.
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whatupboo

Posted: Wed Nov 29, 2006 9:45 am Post subject:

Newbie

Joined: 28 Nov 2006
Posts: 2
Location: LA

Many thanks for the advice.

I am aware of the other security requirements of MQ - I was just curious if leaving the maximum message length at the default might have other ramifications that I might not have thought of.

Thanks again!

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