auth port 113: enable or disable on a router/packet filter?

["Markus Kolb 'Capri'" <debian@tower-net.de>]

Hi,

I have found many usenet postings and every post prefer different
answers ;)

Should I start identd or should I only open port 113 and shutdown the
ident daemon?
Are there any security riscs if my router answers on this auth requests?
Are there any functional disadvantages if I stop the daemon and reject
or deny the port?

thx