Vi$ta reported LAN connection "Local Only" [solved]

The problem had nothing to do with Vi$ta. SO, sorry to Vi$ta.

It seemed that something was changed in iptables without my knowing.

$OUTIF is ppp0 the ISP interface
$OUTIP is the ip address of ppp0
$INTNET is 192.168.1.0/255.255.255.0 (intranet)

(A) $IPT -t nat -A POSTROUTING -o $OUTIF -s $INTNET -j SNAT --to $OUTIP

(B) $IPT -t nat -A POSTROUTING -s $INTNET -j SNAT --to $OUTIP

Line A has been in use for nearly 7 years. But now, I needed to remove
the "-o $OUTIF" part for the SNAT to work properly (as in Line B).

So what's changed?

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