Application Issues
Most application protocols will have to be upgraded: FTP, SMTP, Telnet, Rlogin
27 of 51 Full Internet standards, 6 of 20 draft standards, 25 of 130 proposed standards will be revised for IPv6
No checksum ? checksum at upper layer is mandatory, even in UDP
non-IETF standards: X-Open, Kerberos, ... will be updated
Should be able to request and receive new DNS records