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-rw-r--r--lib/CatDap/Controller/user.pm8
1 files changed, 3 insertions, 5 deletions
diff --git a/lib/CatDap/Controller/user.pm b/lib/CatDap/Controller/user.pm
index e6cc7a1..8c14cfd 100644
--- a/lib/CatDap/Controller/user.pm
+++ b/lib/CatDap/Controller/user.pm
@@ -116,11 +116,9 @@ sub get_keyprefix : Private {
my ( $self, $c ) = @_;
my $keyprefix;
if ($c->req->address =~ m/:/) {
- my $address = $c->req->address;
- $address =~ s/\[\]://;
-
- # if we shift right 104 bits from 128 we have 24 bits left or 3 bytes.
- $keyprefix = sprintf( "%06x", $address >> 104 );
+ # For IPv6 the first 3 can be special and shared by many people,
+ # bytes 6-8 are more interesting
+ $keyprefix = sprintf( "%02x%02x%02x", splice(5, 3, split /:/, $c->req->address));
}
else {
$keyprefix = sprintf( "%02x%02x%02x", split /\./, $c->req->address );