The 4pm duh, Special Holiday Edition

( First, a little backstory. )

So, we have a bit of history with this user. Let me state that, a) the conversation below is utterly typical, and b) it's condensed.

Nutty McBibbler: "I was away in Australia with my laptop and I was connecting from the hotel which was fine but I've got this IP address here and I'm not sure about it."
dariodevil, who I am watching silently scream for about three minutes: "... I'm sorry, sir, you said you're in Australia?"
NMcB: "Yes. No! Austin. I was in Austin. And I had an address from the hotel and I don't know if it's one of yours."
DD: "Well, what is it?"
NMcB: "198...um...hold on"
[Time passes, shenanigans ensue]
NMcB: "It's 192.168.1.101. Is that you?"
DD: "Well, no, but... Could you hold for a moment, please?" *puts on hold* *slowly bangs head into keyboard*
Your Humble Correspondent, taking pity on her loyal minion: "You want I should take this?"
DD: "OH GOD YES." *to NMcB*: "I'm going to transfer you to a senior technician, please hold."
YHC: *picks up phone, finding NMcB in mid-sentence talking to the hold music* "Hello sir, can I help you?"
NMcB: "Yes, I am using Mac OS X Jaguar which your people told me I couldn't use but I've been using it fine for some time, it works perfectly well ever since I did some things--"
YHC: "But I understand you had a question about an IP address?"
NMcB: "Oh, okay, we're going to talk about that. Well yes, I was in Austin, Texas, and I was staying in a hotel, and I connected from there fine and they gave me an IP address, and it created a whole location, you know, in the Control Panel? There's a location called Austin with this IP address they gave me and I wanted to make sure it was okay. It says it gets it from the DHCP server. Is that you?"
YHC: *pauses, attempting to parse the madness* "Well, you said it's 192.168.1.101, right? That's part of a reserved network that is meant for internal usage. Most home networks use NAT, which will assign an address in 192.168.something.something. It's very possible the hotel you were at was using the same netblock, certainly."
NMcB: "But this address, I got it from your router?"
YHC: "No. You're getting it from your DSL router."
NMcB: "But I had the same address in from the hotel!"
YHC: "Yes, as I said, that's entirely possible. And if you did, since it's in the netblock that your DSL router is using, your router should be able to work with it. ...Sir, let me just confirm, is there an actual *problem* with your DSL connection?"
NMcB: "No, it's working fine. I was just afraid I was connecting to the Austin internet."