Protocol 41 is ISATAP (The Intra-Site Automatic Tunnel Addressing Protocol) which is used to create IPV6 hosts and clirnts to connect over IPV4 networks. It's installed by default in Vista and Windows 7.
The IP Address belongs to:
inetnum: 92.242.128.0 - 92.242.159.255
netname: UK-BAREFRUIT-20071227
descr: Barefruit Ltd.
country: GB
org: ORG-BL53-RIPE
admin-c: PR42-RIPE
tech-c: PR42-RIPE
status: ALLOCATED PA
mnt-by: RIPE-NCC-HM-MNT
mnt-lower: CATALYST2-MNT
mnt-domains: CATALYST2-MNT
mnt-routes: CATALYST2-MNT
notify: ripe[at]catalyst2.com
changed: hostmaster[at]ripe.net 20071227
changed: bitbucket[at]ripe.net 20080708
changed: bitbucket[at]ripe.net 20081007
source: RIPE
Which is a UK ISP service company:
http://www.barefruit.co.uk/the_barefruit_solution.htmI don't believe this is a problem.