Canon EOS-1D C - Manual (Page 72)

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Settings originally completed using the connection wizard can be
changed as follows. You can also change IP security settings (IPsec)
that cannot be set using the connection wizard, as well as other
settings, such as when an image with the same file name as an existing
file is sent to the FTP server (p.73).
1
Select [Communication settings].
2
Select [Network settings].
Once [Communication func] is set
to [Enable], you can select [Network
settings].
3
Select [Set up].
4
Select [LAN settings].
Changing Settings
COP
Y