I'd use something similar to one of the techniques found by searching for natural sort. Likely: 

my @sortedIdx=
        map { unpack "N", substr($_,-4) }
        sort
        map {
            my $key = $oids{ifName}{$_};
            $key =~ s[(\d+)][ '0' . pack "N", $1 ]ge;
            $key . pack "CN", 0, $_
        } keys %{$oids{ifName}};

[download]

Though I'm a little curious why your integer indices are used to index a hash not an array. If your keys aren't just integers, then you'll need: 

my @keys= ( keys %{$oids{ifName}} )[
        map { unpack "N", substr($_,-4) }
        sort
        map {
            my $key = $oids{ifName}{$_};
            $key =~ s[(\d+)][ '0' . pack "N", $1 ]ge;
            $key . pack "CN", 0, $_-1
        } 1 .. keys %{$oids{ifName}}
];

[download]

(Updated)

- tye        

In reply to Re: best practices for a complex sort + splitting an alphanumeric string (natural) by tye
in thread best practices for a complex sort + splitting an alphanumeric string by gabrielle

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