Your basic ITPro blog... What's going on at work, what I'm interested in.

Tuesday, July 15, 2008

The Law of Unintended Consequences - Revisited

I recently commented on how we made some changes to our system that resulted in unintended consequences. Well, we got another dose of this last Saturday. Had I thought through things a bit more thoroughly, I might have caught this.

The new Cisco wireless install already required some big changes to our Checkin Kiosk computers. The changes were made, though, and the kiosks seemed to be working fine. We noticed that the wireless clients connecting to these new WAPs were getting configuration information from the Gilbert campus, even though they were on the Mesa campus. This is because we have just on Controller, which is in Gilbert.

We realized that this would mean that network traffic for these clients would all traverse our WAN link (currently a T1). Not ideal, but workable.

What we didn't realize was that this would impact event publication to our checkin kiosks. Our checkin system uses source subnet on the kiosks to determine which events to make available. Mesa events would be available on kiosks with "Mesa" IP addresses and Gilbert events would be available on kiosks with "Gilbert" IP addresses. Of course, now all kiosks were effectively in Gilbert!

So, Saturday night, as we tried to start checkin for our evening service in Mesa, our kiosks showed 'no events available'. We quickly scrambled and put our old Linksys WAPs back in place so that checkin would work.

So... more unintended consequences and, thus, more work to do.

D

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Secret Message (The same message as before, run through the encoder again):

AAT63385O9UA957E36U6HFIC0OAO249EUUO1OGY4I75G6T31AZKO0156IW6C2I755EAH29UOAA22UGAXW00UQXAE373EJ9E3
IOUH1UY98F45ODRZ2U5PBI38518AXTEA533A987XNIE31AA6O9I9160AOOV93ICX8A09167IOUL1OGAPR1671UIUA38UTIJZ
09OWQJ29268OLA60O66RUU5E4AIII945ALLUF20AALP3IS6R125ATAY6W1A9EOA72E9O80UEIU2IIEZ2EV6B72U5LE4UEKO8
600UU96AK3199UQ6AH7R82E697ZQX77046A9P578E63846E67G5I7EU18EAEA43878I9Z5TAR2IETX41955886UHS4654U9R
3EGAFE72980UL886IC79W0OLU9W5W1IAEU254AT7VUU246E53EW6U9IR22IKI3877AL5AT677D7180UH5W9S950486ET75O3
AP7IIU2IAA76I53UVP6US29746IEPB44IG7S22OQUQX24AWWK41EMCA5S391AIUO48546IXAHE3EOA07IPTS02ETRM34IWFU
3UELU3IFIG0OI5E6O3AQDP3IEIM40UUEAF63EAIKT11AHQTIL23

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