def render_services(args, df):
    """ replace service number with service name, for common services"""
    for col in ['srcport', 'dstport']:
        df[col][df[col] == '22'] = 'ssh'
        df[col][df[col] == '23'] = 'telnet'
        df[col][df[col] == '53'] = 'domain'
        df[col][df[col] == '80'] = 'http'
        df[col][df[col] == '8080'] = 'http'
        df[col][df[col] == '88'] = 'kerberos'
        df[col][df[col] == '123'] = 'ntp'
        df[col][df[col] == '161'] = 'snmp'
        df[col][df[col] == '443'] = 'https'
        df[col][df[col] == '563'] = 'nntps'
        df[col][df[col] == '636'] = 'ldaps'
        df[col][df[col] == '992'] = 'telnets'
    return df