Hook up a Linux using an XP host

How to hook up a Linux using an XP host?

First of all ICS or a proxy service are the way to go.
XP is a bit limited with other choices. If you already
had ICS set up for the XP partition the same settings
will work for the fedora one.

For the other part. No. Linux has nothing to do with it.
The ICS configuration ist just settings within the XP
partition. Linux can't change that. You have recently
installed a firewall or made some firewall rule changes
on either of the crates?