Fedup-Network 18

I am trying to upgrade from f17 to f18 using fedup. I am getting this error in the *.log file:
"
fedup-cli --network 18 --debuglog fedupdebug.log
setting up repos...
getting boot images...

Downloading failed: couldn't get boot images: curl#7 - "Failed to connect to 2607:f1f0:1:3::2: Network is unreachable"

Any help...please NOTE that my network isn't down since I am posting this message from the same computer. Also, my firefox works awesome.

Thank you.

---------- Post added at 11:27 AM ---------- Previous post was at 11:08 AM ----------

I am not sure if it's that though since it appears I have IPv4 ONLY, unless the website accepts IPv6! See below when I ran a test of it:

Your IPv4 address on the public Internet appears to be ***.64.86.***

Your Internet Service Provider (ISP) appears to be SHAW - Shaw Communications Inc.

No IPv6 address detected [more info]

Good news! Your current configuration will continue to work as web sites enable IPv6. [more info]

You appear to be able to browse the IPv4 Internet only. You will not be able to reach IPv6-only sites.

Your DNS server (possibly run by your ISP) appears to have IPv6 Internet access.

BTW, thanks for your quick reply