Firewall settings for Dropbox LAN sync

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http://askubuntu.com – I have two Ubuntu 12.04 computers on a wireless home network, kept in sync using Dropbox. I use Dropbox rather than Ubuntu One because of its LAN sync feature - preferable to doing everything via the internet. Will using GUFW (firewall) disable this LAN sync function? If so, how do I get round it? (HowTos)