BitTorrent. U nfortunately, m any d evices a nd a pplications h ave s oftware d efects t hat, w hen
exposed t o t he I nternet, m ay p ut y our n etwork a t r isk o f u nauthorized a ccess. W e s trongly
recommend t hat y ou r egularly u pdate t he s oftware o f a ll t he d evices a nd a pplications y ou w ant
to e xpose. F ingbox S ecurity C heck h elps t o b e a ware o f w hat g ets e xposed t o t he I nternet.
If y ou're n ot f amiliar w ith c oncepts l ike I P r outing a nd p ort f orwarding, y ou c an r ead t he f ollowing
section " Meet t he r outer".
Meet t he r outer
Your h ome n etwork i s c onnected t o t he I nternet t hrough a s pecial d evice c alled r outer . I t a cts
as t he d efault g ateway u sed b y a ll t he o ther d evices a nd s oftware a pplications t o r each
services a nd c omputers o ver t he I nternet. Y our r outer h as u sually t wo " sides", t echnically c alled
interfaces: a n i nternal i nterface ( typically l abeled L AN) f acing y our h ome n etwork a nd a n
external i nterface ( sometimes l abeled W AN o r I nternet), c onnecting t o y our I nternet s ervice
provider ( directly t o c able, D SL, f iber o r w ireless o r i ndirectly v ia a m odem d evice). Y our r outer
is t he b ridge b etween t he g lobal i nternet a nd y our h ome.
The e xternal i nterface w ill b e a ssigned b y y our p rovider a P ublic I P a ddress. T his i s t he
equivalent o f y our h ome a ddress i n t he g lobal i nternet, u sed t o d eliver d ata t o y our d evices.
Your d evices o n t he o ther h and w ill b e a ssigned I nternal I P A ddresses n ot v isible f rom t he
outside w orld. T he s ize o f y our i nternal n etwork ( ie. h ow m any i nternal d evices c an b e
addressed) i s c alled a S ubnet . A t ypical s ubnet i s 2 55.255.255.0 a nd i t c an i nclude u p t o 2 54
devices. I nternal I P a ddresses c an b e a ssigned m anually o r b y a s ervice c alled D HCP S erver
which o ften r uns o n t he r outer i tself.
The r outer a cts a s a f orwarder o f d ata b etween y our d evices o n t he i nternal i nterface a nd t he
global i nternet o n t he e xternal i nterface v ia a p rocess c alled N AT ( Network A ddress
Translation).
Router w ith i ntegrated W iFi
If y our r outer a lso a cts a s t he W iFi a ccess p oint , t he W iFi n etwork i s t ypically a ttached t o t he
internal i nterface a nd a ll t he w ireless d evices w ill u sually b e i n t he s ame s ubnet a s t he o nes
wired t o t he e thernet p orts o f t he r outer.
Guest W iFi
In c ase y our r outer o ffers t he ( wise) o ption o f c reating a " guest" n etwork , i t's i mportant t o n ote
that i t i s c ompletely s eparate f rom y our h ome n etwork. T echnically, t he g uest n etwork i s a
dedicated s ubnet, w ith i ts o wn d edicated " internal" r outer i nterface a nd n etwork a ddress
numbers. T ypically a g uest d evice c annot a ccess d evices o n y our h ome n etwork ( and t his i s a
User's G uide - A pp v 6.2.1
Page 4 3
Fingbox
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