Whee, my first hint!

A couple of notes:

• In 10.5 step 5, one easy way to open the file is to type the following in Terminal: open -e /tmp/bootpd.plist
• In 10.5 step 6, you do need to save your changes to the file before going to step 7 (duh).
• We (well, mostly me) had a couple of threads about this at Ars Technica: thread 1, thread 2. The first thread contains my bug report to Apple about the issue, which (for people who are interested) should help to explain what's actually happening.
  
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Aack, I meant step 4, not step 5, in the first item there.

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Whenever I type "open -e /tmp/bootpd.plist" I get a message saying that "The file /tmp/bootpd.plist does not exist." Does anybody know why this is happening?

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Did the command in step 2 execute without an error message?

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Actually it doesn't seem to be a bug. It looks like Internet Sharing before to enable the sharing looks for the file /etc/bootpd.list. If one is there it reads it, gets the interfaces configurations and global parameters (like reply_threshold_seconds), stores it somewhere and then updates the file only for the interfaces that have been modified (enabled/disabled, I believe).

I discovered that because by mistake I didn't stop InternetSharing before to modify bootpd.plist. When later I stopped it bootpd.plist got deleted. Then it has been created again with the default OSX value once I activated Internet Sharing again. I believe it's kind of messy as a system configuration, but once it is understood it does the job.

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